ITON. ALARAl-I. 19% the period of low river flO',] ... (Simulium sop. and various mid~es). The...

A 11 1010GICAL STUDY or THE CONECUH-ESCAMBIA RIVE R

IN THE VICINITY OF BRE\ITON. ALARAl-I". 19%

Submitted by

E. Cli ff WebberD. R. BayneHend y S eesock

Department of Fisheries and Allied AquaculturesAgrictlltllral Experiment Stati.on

Auburn Universi.ty, labama 3h84q

DeceMber. 1986

Mike StruveFred Leslie

TABLE OF CONTENTS

INTROllUCl'ION ••••••••••••••••••••••••••• ,........................ 1

I. PHYTOPLANKTON COflHUNIT lES, CONECU H-ESCAfIB IRIVER, 1986 •••••••••• ,.................................... 5

n. HACROINVERTERRATE COHNUNlTES, CONECUH-ESCANllIARIVeR, 1986 7

HI. FlSH COHMUNITY STUDIES, CONECUH-ESC"HBIARIVER, 198~ ••••••••••••••••••••••• ,.. ••••• ••••••• ••••••••• 14

LITERATURE CITED................................................ 21

APPENDIX TABLES ,........................ 22

ii

INTRODUCTION

rhe lq86 study is the sixteenth vearlv survev of biological

productivity in the Conecllh-EsC8Qbia Rivers conduct~d by the Rivers and

Reservoirs laboratory of the Department of Fisheries and Allied

Aquacultures of Auburn University. Prlor to this study, the Institute

of Paper Chemistry of Appleton, Wisconsln had conducted lS surveys on

the stretcll of these two rivers he tween Brewton, Alab~ma and Escambia

Bay in Florid a.

The primary object"ive of these yearly studies i.s to rletermine if

P.1sjor chanp.;es in water quality due to paper 111i.11 effluents can be

detected from studies of the blotrt. During the period of low river flO',]

in late Au~ust and September, plankton, macroinvertebrates, anrt fish

populations \Jere <;ar:1pled at stations above and below the discharge froM

the Contailler Cocporatioll of America paper mill. The results of the

lq86 study are summarized in this report.

Water level in the river fluctuated significantly only once during

the sampling period. Sample stations ""ere located in the SfWle I!eneral

vicinity as those utilized ill previous surveys. The location of all

stations Are shOlvn 'in Figures 1 and 2, which are maps of the Conecuh and

Escambia Rivers. Table 1 rrovides a rlescripti.on of each station

including physical and hydrological features of each location. The

mi.leage index ~vas calclllated \Islng the Brewton Lake outfall as mile 0.0.

Stations upstream of the olitEall were assigned negati.ve distances.

I

Fi f',u r' 1, Sample S l " ( i on s I\ ill (he C.011e clIll Rive r,

Mili

. IeN

I

I rIl rcw(~n (Ir~ .. " ")/l,~f/I. . >.........~~/ ... --,-r-i ' , .' 'f' " , . .

r .' . I ~r0. : -ro ·1I

'2 ~M 'r~ urder Creek

/~~l~~, Brewton Loke [('"' If ~) Edwords

([olntofOi J!b~ I1ririschugel e go

lI'nllord ... :···· " ." '(, . (If I

~I--::~'-"-:0-..--" \'.~' ~":'rt1~ ".-........: (,

o~)

Little ~"'....---Esc:lmbi:l~ IY \..C1 5~ 6 -

Creek 1)- -'~ .,II .' - '__ ~l;l.

Fl:l.,,~ i Ie

F i)', \I I \' '

Pine Barre

Corp.

~ns3.Col3.

3

Litelc ESC3.:nbi a

Creek

J ~i cs

Table I

Description of sampling stations on the Conecuh-Escambia Rivers, lq86

~lilea~e

Index;' Station

-9.9

Location

Vicinity ofEdward's Ilridge

Current

Rapid

Location of Sample

Left bank (downstream), 500 ydsbelo\} Edwa rd' s Il ridge

-6.9

-0.3

2 In Murrier Creek,upstream from mouth

Just above Gay Lake

Just below Gay Lake

Rapid

Raoid

Rapid

Right bank of creek(d O\ms t ream)

Left bank f river(downs t ream)

Left hank of river(downstream)

o. I

1.0

3. I

5

6

7

One hundred fifty ds Rapiddownstream Conta inerCorporation Outfall

1 mile downstream RapidContaLner CorporationOutfall near Pollard

Above mouth Little RapidEscambia Creek

Right hank of river(downstream)

Right hank of river(downst ream)

Left bank of river(d O\.ns t ream)

5.7.

8.6

20. I

R

9

10

II

VicInIty of pipelinecrossing

Century Brirlge,Flo rId a

Pine Barren, Florida

Nol ino, Florida

Rapid

Rapid

Rapii

Rapid

Uostream pipelille3/4 mile, left bank(downst ream)

Upstream of bridge400 yds, right bank(downst ream)

Left hank of river(upstream), 1/2 mileup river

East side DE river

12 Cottage Hill Landing Moderate Both sides of river

*Mileage hased on Brewton Lake outfnll as 0.0. Upstream distancesexpressed as ne~1tive.

4

I. PHYTOPLANKTON CONl'lliNITIES, CONECUH-ESCANBI RIVE R, 1986

Phytoplankton saMples were collected at three stations by

preserving 500 ml of river water with merthiolate (1·leber 1973). Two

samples to/ere collected at each site, counted J identified and mean

numbers of algae reported for that location.

Previous studies of this river system have established the fact

that phvtoplankton densities are usuall. 10\01. Tvpically, riverine

habitats with morlerate to rapid flows and sudden fluctuations in water

level do not slipport dense plankton communities. ni.~ltOTTlS usual] v occur

in higher numhers in runninR waters as they are washed free from arious

substrates (logs, rocks, debris) on which they grOl'. The fact that

relrltively large numbers of green and blue-green algae \vere found in the

samnies was indicative of the runoff fro~ streamside ponels and swamps

(Table 2).

5

Table 2

Ph toplankters collected at selected stations in theConecuh-Escambia River, 21 AURust 1986

Station

A19a1 Taxa 6 12

Diatoms (Chrysophvta)

Phytoplankters/ml

PennateCentricOther

Green Algae (Chlorophyta)

FilamentousCoccoidFlagellates

BlueRreen Algae (Cyanophyta)

Fi lamentousCoccoid

Other Pigmented flagellates

Total

6

27839o

o16 l110

16137

26

787

51780

7

o245199

53

1333

8648

5

o91

140

15135

19

539

n. rl~CROINVERTEBRATF. COHHUNIT rES. CONECUH-ESCAI1B IA RIVE R, 19Rh

~1acroi.nvertebrate communities weLe again sampled to evaluate

extended-term water tlualLty above and belOlv the rlischar,e-e frol11 the

Bre"ton Hill of Container Corporation of America (CC~). This Has the

list biolog-Lcal survey f: this ri.ver system dOCllmenting long-term

effects on the benthos by oaper-making effluents from cc~.

PROCEDURES

~r[ificial substrates (plate samplers) "ere used to sample the

macroinvertebrate comnunity. This is a ~tandardized technique allowing

quantitative comparisons between locations in a river systeln like the

Conecuh-Escambia (Weber 1973). Each sampler consisted of a set of nine

3 x 3 x 1/8 lnch plexi~lass plates placed on an eve bolt and separated

by l/R i.nch-thick spacers. The upper and Im.,rer surfaces of each plate

were sanded providing a textured s [face for organism attachment. The

total surface area (exclusive DE edges) for each sampler was one square

f"ot. The plate samplers were suspended l to 2 feet belo\ol the surface

of the '''ater. Four samplers were placed at each station.

During 1986 plate samplers were placed in the river on 21 August

for a four week incubation. In retrieving a sampler, the suspending

line ,"as slo,y-Iv lifted until the sampler was just under th~ ~.,ater

surEace~ a ~ide-mouthed container was then slipped under the sampler and

the plates were held in tile container of water. The container with its

contents was stored in an ice cllest for return to the laboratory. In

the laboratory macroinvertebrates were scraped from the plates~ sieved

7

through a U.S. Standal-d No. 30 screen (0.5 mm mesh) and preserved in 70%

alcohol until they could he counted and identified.

RESULTS AND DISCUSSIO

Current aquatic studIes relating bi.ological productivity and \vater

quality still rely on benthic macroinvertebrate abundance and diversity

as an indicator of stream conditions. Additionally, macroinvertebrates

are often categorized on the basis of tllelr tolerance to a range of

environmental stresses, particularly organic enrichment. Organisms that

survive anI a narr w ranj!e of environmental strp-ss are called

intolerant forms. Organism~ that can witllstand wide fluctuations in

habitat disturhances are called tolerant. Organisms tllat CRn tolerate

occasiollal periods of stressed conditions are called partially tolerant.

This system of cla~~lEicatjon has been based Mainlv on the response of

tile organism to organic enrichment.

Tlle river bottom within the studV area was composed mostly of

sll; Etin~ sands. During periods of high water the cnrrent is swift and

the canacity Ear transDorting sand is great. This results in scouring

of the various substrates colonized by lllacroi.nvertebrates and IIsually

reduces benthic abundance. The multiple plate s~mplers allo«ed a

reasonable comparison between sample stations even though these

substrates were subjected to the scouring action of suspended sediment.

R

The macroinvertebrate fauna at e~ch station consisted mostly of

immature aquatic insects in three orders: ephemeropterans (mayflies),

trichopter?ns (caddlsflies) and dipterans (micio;es and blackflies)

(Tables 3 and 4). Standino; crops (abundance) varied widely he tween

stations. Station 5 just below the eCA outfall and station q near

Century Bridge had the highest macroinv€rtebrate densities (Table 4).

Conversely station 4 located just below Gay Lake had the lowest

macroinvertebrate density. Excluding station 4, macroinvertebrate

abundance at stations above tIle eeA outfall were similar to densities

found at stations 6-12. Th~ higher density just below the CCA outfall

may indicate nutrient enrichlnent in the river. Species richness, as

measured by the number of. different taKR, \"C:1S highest at statLon I near

Edward's Rridge (Table 3).

Hacroinvertebrate community structure consisted mostly of taxa

adapted to erosional habItats typical in a river like the Conecuh.

Examples of these taxa include mayflies (Stenonema spp., Heptagenia

spp., Caenis spp. and Tricorythodes spr.), caddisfil.es (Hydropsvche

51'1'" Cheumatopsyche 51'1'" and Oecetis sop.), beetles (Elmidae),

stoneflies (Perlidae) and ciipterans (Simulium sop. and various mid~es).

The morphological adaotations of these insects ~re related primarily to

problems of feerling and growtll rather than conceallnent from predators

and competition (Cummins lQ72).

The classification of macroinvertebrates as intolerant) partially

tolerant and tolerant was monified Erom previous reports base on

9

Table 3

Number of taxR collected at each station in theConecuh-Escambia River, 18 September 1986

Stations

Taxon 1 2 1 4 5 6 7 8 9 10 11 12

TurbelJaria 0 0 1 0 I 1 I n () 0 0 0Oligochaeta 1 1 I 1 1 1 I I I 1 0 nHirudinea n 0 n 0 1 n 0 n 0 n 0 0Ostracoda 0 0 0 0 1 0 0 0 0 n 0 (1

Amphipoda 0 0 0 0 n 0 0 0 0 0 () 1HydracarLna 1 1 0 1 0 I 1 0 I 0 1 1Ephemeroptera '; 5 5 'i 2 J 4 4 5 5 6 5Odonata 1 0 0 2 1 I 0 0 0 0 1 2Plecoptera I I 1 1 2 2 2 () 1 1 2 0"Iegaloptera I 1 I 0 I 1 I I I 1 1 0Trichoptera 1\ 5 7 5 4 6 3 6 5 10 q 6Coleoptera I 1 I 1 1 1 2 1 2 2 1 1Diptera 22 16 II 11 10 8 4 12 7 10 9 19~Iollusca 0 0 0 2 5 1 2 1 1 I I 2

Total 39 31 30 31 30 26 21 26 24 31 31 37

No. Samplers 4 3 3 4 4 3 2 4 4 3 4 I,

Taxa/Sampler 10 10 10 8 8 9 I 1 7 n 10 8 q

10

Table 4

~tajor insect orders and Flverage abllndance of ore:anisms/ft2

collected at stations i.n the Conecuh-Escambia River,IR Sep tembe r 19R6

Stations

Taxon 1 2 3 4 5 6 7 8 9 10 11 12

Epheme roptera 30 I I 19 15 51 18 30 27 27 1,4 48 38

Odonati'l 0 0 2 0 I) 0 0 2

Plecoptera 2 2 4 2 2 2 0 1 2 4 0

Hegalopteri'l 1 n 1 I) 3 0

Tr lchopte [a 191 168 173 8 87 171. 70 34 166 38 33 32

Coleoptera 3 4 1 1 2 2 2 5

01 pte ra 69 :::!l, 156 2R 708 374 175 36 382 327 274 165

Total 297 207 354 55 854 571 2RI 101 57R 414 365 242

11

Table 5

Number of taxa classed as intolerant, ~rtially tolerant andtolerant collected at st:qtions In the Conecuh-Escambia

Ri ver, lil Seotember 19i16

Station

1

2

J

4

5

7

8

9

lO

II

l2

Intolerant

2

2

5

J

2

J

4

h

J

Partially Tolerant

26

21

21

19

16

12

20

16

20

22

24

12

Tolerant

8

6

J

J

4

1

2

2

o

4

additional information regarding certain genera (Georgia Water

Quality Control Board 1972; lVeber 1973; Hilsenhoff 1977). Addltionally

scation 1 had the Most insects classified as tolerant, whereas stations

to and 11 had the most intolerant insect taxa present (Table 5).

In summary, the plate samples did not reveal any deleterious

effects of Container Corporation of ~merica effluents on benthic

macroinvertebrates in the ConeclIh-Esc.ambia River. The 80pendix includes

tables listing all macroinvertebrates collected at each station along

with their tolerance classification and average density.

13

Ill. FISH COmlUNITY STUDiES, CONECUH-ESCAHBIA RIVER, IQS6

Th~ same sites sampled durin~ previous studies, above Edward's

Rridge and below Pollard Landing, were electrofishecl on 18 September

lQS6. Catch data are presented for each station in Tables 6 and 7.

Both sampling sites \"rere electroflshed for Eorty-five l'1i nutes. At

Edward's Bridge 268 fish were captured representing 21 species from In

families. At Pollard Landing a total of 227 fish representing is

sppcies from 11 families were cRptllred. S yen species of sport fishes

(Centrarchidae) l4ere collected at Edl4ard' s Bridge and five species at

Pollard Landing. Fifty-four centrarchids l4eighin~ a total of 2.0 kg

\vere captured at EdwArd's Bridge and 3q centrat-chjds l"elghing a total of

2.0 kg were collected at Pollard Landing. Numerous ynung-Qf-the-year

centrarchids were pl~esent at bOI:h locatlons.

Diverse and apparently healthy fish conmuniti s existed at both

sampling sites during the 1986 study. Based on these data, there is no

evidence of adverse impAct on fish cOMmunities below the cc~ outfall.

Table 6

Electrofishing data collected during forty-five mjnutes of shocking Inthe Conecuh-Escambia River near Edward's Bridge, IB September 1986

Species

Lepisosteidae (gar family)Lepisosteus oculatus (spotted gar)

Clupeidae (herring family)Dorosoma cepedianum (gizzard shad)

Number

2

1

Length( cm)

3853

26

\,eight(grams)

78502

laJ

Cyprinidae (minnow familv)Notropis longirostris (longnose shiner) 2

24

No tropis texanlls (weed shi ne r) 67

Notropis venustus (blacktail shiner) J75026Iq

8

Carostom:idae (Slicker family)Carpiodes velifer (highEln carpsucker) 16

15

4/ea5/ea5/ea

5/ea5/ea7

'ilea51ea6/ea7 lea8/eaq

16161617181920222727272q

292

.5/ea

.7 leaIlea

1 lea2/ea3

.il/eaIlea2/eaJ/ea4 lea6

48545559729096

[242142602772a3J27348

Table 6 (continued)

Length l;eightSpecies Number (em) (~rallls)

30 35736 521

Hoxostoma Doecilurum (blacktail 9 6 2red horse) 7 3

8 4l8 58

2 19/ea 69/ea20 7520 792J 9122 9838 493

Ie talu rid ae (freshwater catfish family)Ictalurus punctatus (channe I catflsh) 30 209

Pvlodictis olivari.s (flatheAd catfish) 2 25 l4027 l7R

Atherinidae (silverslde family)Labidesthes sicculus ( brook 1 5 .5

sil verside)

Centrarch idae (sunfish family)AmblopIi tes rupestris ( rock hass) [9 132

Lepomis macrochirus (bllleglll) 3 7 611 16l2 29

2 14/ea 46/ea

Lepomis negalotis (longear sunfish) 6 4/ea l/ea5 2

2 6/ea 4/ea2 7/ea 5/ea7 8/ea 7/ea6 8/ea 9/ea2 9/ea 10/ea

l6

Table Ii (continued)

Length WeightSpecies Number (cm) (grams)

8 9/ea 13/ea2 [Olea 16/ea

12 3314 5316 93

Lepomis microlophus (redear sunfish 3 11 17shellc racked 20 143

23 243

Hicropterus punctulatus (spotted bass) 1 12 17

~1icropterus salmoides (largemouth hass) 4 18 6021 12923 14527 247

Pomoxis nigromaculatus (black crappie) 1 27 257

Percidae ( perch family)Percina caorodes (logperch) 1 9 5

Percina nigrofasciata ( blackbancted 2 4 lea .6/eadarter) 3 51ea l/ea

7 3

'hgilidae (mulle t family)'lugil cephalus ( strioed mullet) 2 )(, 598

42 889

Soleidae ( sale fami.ly)Trinectes maculatus (hogchoker) 3 5 3

6 3r, 5

3 7lea 7/ea2 7lea 8/ea

17

Table 7

Electro[LshLng data collected during forty-five minutes of shocking inti,e Conecuh-~scambiaRiver near Pollard Landing, lR September 19R6

Species

Lepisosteidae (~ar family)Lepisosteus oculatus (spotted gar)

Amiidae (bowfin family)Amia calva (bowfin)

Numher

3

Length(em)

424648

42

"eight(grams)

262349393

818

Anguillidae (freshwater eel family)Anguilla rostrata (American eel) I

Cyprinidae (minnow family)Notropis longjrostris (longnose 2

shiner)

Notropis texanus (\"eed shiner) 1817

Notropis venustus (blacktail shiner) 4iO343613

33

3

Catostomidae (sucker family)Carpiodes velifer (highfin carpsucker) 8

3

Moxostona poeciluruQ (blacktail 6redhorse) 2

Iii

55

s/ea

S/ea6/e~

4/eaS/eaS/ea6/ea7 leaR/eaR/ea9

10/ea

1619/ea192022252R3031

89/ea

3SR

Ilea

I lea2/ea

.7 lealIea2/ea2/ea3/ca4/eaS/ea6

10/en

5193/ea

100101169196343395435

56/ea

Speeics

Table 7 (continued)

Numher

22

Length( cm)

10/ea10/ea2022243239

Height(grams)

9/ea12/ea90

LIO1503';3689

Ictaluridae (freshwater catfish family)Pylodictis olivaris (flathead catfish)

Cyprinodontidae (killifish family)Fundulus olivaceous (blackspotted

topminnow)

Centrarchidae (sunfish family)Lepomis macrochirus (bluegill)

Lepomis megalotis (longea. sunfish)

Lepomis microlophus (redear sunfishshellcracker)

Micropterus punctulatus (spotted bass)

19

5

1

25

2.3554

2

2

713161722

5/ea1112L516IR

5/ea7/ea9/ea

IO/eaL21214II,

L523

10Ll

5254653

113

4

Ilea24285381

130

2/ea6/ea

14/"a17/ea29315267

58274

817

Specles

Table 7 (continued)

NumberLength

( em)\,eight(grams)

Hicropterus salnoides (largemouth bass) 9 8 S9 89 10

10 I lII 1617 7424 17730 12131 J6J

Percidae ( perch family)Percina nigrofasciata ( blackbanded 2 Slea Ilea

darter) 2 S/ea 2/ea2 olea 2/ea

7 1

t1ugi I idae (mullet family)Hugil cephalus (striped mullet) 19 714

Soleidae (sale family)Trinectes maculatus (hogchoker) 2 8 8

8 10

20

Cummins, K. \.J.Oglesby, R.Ecology andNe\v York.

LITERATURE CITED

1972. What is a River?--Zoological Description. In:T., Carlson, C. A., and NcCanll, J. A. (Ed,;;.), RiverMan. 465 pp., pp. }}-51. Academic Press, London and

Georgia Water Quality Control Roard. 1972. Chattahoochee River BasinStudy. Ga. I'tr. Qual. Cont. Bd., .\tlanta, GA. 206 pp.

Hilsenhoff, I,. L. 1977.streams. TechnicalResources, Nadisol1,

Use of arthropods to evaluate water quality ofllulletin No. 100, Department of NaturalIH.

I,eber, C. l. (Ed.). 1973. lIiological field and laboratory methods [ormeasurinS?; the quallty of surface waters and effluents .. U.S.Environmental Protection Agency, Washington, nco

21

APPENDIX TARLES

22

Table 8

Benthic maccolovertebrates collected from plate sample rs in theConecuh-Escambia River near Ed\.Jard l s Bridge (S ta tion 1) •

18 September 1986

1'lal:e SamplerReplicate

AveragzTaxon Tolerance A B C D :IIa./ft

Oligochaeta T 5 2 3 3 3

Hyd racarina 1'T 1 0 0 +:';:

EphemeropteraIJnidenti fied 9 0 3Baetidae

Baetis spp. 1'T 0 0 10 0 3Unidentlfied 4 0 I) 8 3

CaenidaeCaenis spp. PT 21 14 1 4 LO

Heptagen l idaeStenonema spp. PT 3 5 3 3

OligonenriidaeIsonychia spp. I 3 0 () 0 +

TricorythidaeTricorythodes spp. 1'T 10 LO 1 6 7

OdonataCoenag-rionidae

I\rgia spp. PT 0 0 i) +

PlecopteraUnidentified I) I) 0 I +Peridae

Unidentified I) 0 0 +

NegalopteraCorydal id ae

Corvdalus cornutus PT 0 2 0 0 +

Tei chopteraUniden U fied 1 I) 0 0 +lIyd ropsychldae

Cheumatopsyche spp. T 3 I) I) 1 IHacronema spp. I 4 4 1 1 3Unidentif il~J 8~ () 194 393 168

23

Table 8 (con ti nuec1)

Plate SamplerRe plica te

Taxon Tolerance C DAverav,Z

A B No.jft

HydroptilidaeHyd roptila spp. PT 6 I 4 3

LeptoceridaeNectopsyche candida PT 0 0 I 0 +Nectopsyche spp. PT 20 I 0 0 5Oecetis sp. PT J 2 5 l J

PolycentropodidaeNeu recli psis spp. T 1 13 4 0 5

Pupa I 0 0 0 +

ColeopteraElmidae () 2 0 0 +Adults I J l J 2

DipteraChi ronomidae

Ablabesmyia para ;anta PT 3 0 0 0 +Anatopynia sp. America 0 0 2 0 +Chironomus spp. T 0 0 2 0 +Cladotanytarslts spp. 0 lJ 0 0 JConchapelopia spp. PT 0 ? 0 2 ICorynoneura spp. PT 9 7 5 5 7Cricotopus bicinctus T J 2 J 0 2Cricotopus sp. I PT 3 0 3 2 2Cryptochironomus fulvus PT 0 2 0 0 +Dicrotendipes lobus T 0 2 2 2 2Glyptotendipes spp. T 0 () 2 0 +Nanocladius spp. PT J 0 J 2 2Nilotanypus 5pp. PT 6 0 2 0 2Nilothauma spp. PT J 0 0 0 +Orthocladinae J 7. 2 2 2Parachironomus monochromus PT 0 0 2 0 +Pentaneura sp. PT 0 0 2 0 +Polypedilum convictum PT 14 2 0 5 5Pseudochironomus spp. T 3 0 0 0 +Rheotanytarsus spp. PT 14 5 R l5 11

24

Tahle 8 (continued)

Plate SamplerReplicate

Taxon Tolerance A B c DAverag2No./ft

Tanytarsus spp.Thienemanniella spp.

AdultsPupaSimuliidae

Simulium spp.Pupa

Total NumberlS mpler

PTPT

PT

] 5 R 7 66 4 5 17 82 2 1 ] 21 2 2 ] 2

5 0 1 0 20 1 0 0 +

251 120 283 491 287

?*Indicates less than one organism/ft-.

25

Table 9

Benthic macro invertebrates collected from plate samplers in theConecuh-E scamb La River in '1urder Creek (Station 2) •

[R September [986


Avera gzTaxon Tolerance A B C D* No./ft

Oligochaeta T 1 1 9 4

Hydracarina PT 0 2 f) +,,,',

Epher:1eropte raUnidentified 3 0 1RA.etidae

Unidenti fied 0 2 1Caenidae

Caenis spp. PT f) () +Heptagenlldae

Stenonema spp. PT 2 9 8 6Oligoneuriidae

Isonychia spp. 1 0 0 +T r icoryt hidae

Tricorythodes spp. PT 0 +

PlecopteraUniden ti fled 0 0 +Peridae

Acroneuria spp. 1 2 0 0 +

~1egaloptera

CorydalidaeCorydalus cornutus PT 1 1 2

TrichopteraBrachycentridae

Brachycentrus spp. PT 0 0 +Hyd rops ychidae

Cheumatopsyche spp. T 4 0 2 2Hyd ropsyche spp. PT 14 14 18 15IJniden tH led 124 154 [(,2 147

Hyd roptil idaeIlvd roptila spp. PT 0 +

26

Table g (contlnued)

Plate SaMPlerRepllcate

TcJXDn Tolerance A B C D*AveragzNo./ft

Leptocerldaeecetis sp. PT 0 2 2 1

Pupa 1 2 1 1

ColeopteraElmidae l

Di pte raChi ronoPlidae

Ablabesmyia parajanta PT 0 1 0 +Chironomus spp. T 0 1 0 +Conchapelopia spp. PT 0 l 0 +Corynoneura spp. PT 0 0 1 +Cricotopus btcinc tus T 0 0 l +Cricotopus sp. I PT 0 0 l +Glvptotentipes spp. T 0 0 1 +Nanocladius SPp. PT 2 l 10 4Nilotanypus spp. PT 0 0 2 +Nilothauma spO· PT 0 0 1 +Orthocladiinae 0 0 1 +Parachironomus monochromus T 1 0 0 +Polypedilum convictum PT 1 J 2 1Polypedilum spp. PT 0 0 l +Rheotanytarsus spp. PT 2 1 2 2Thienemanniella spp. PT 1 0 5 2

Adults J 0 0 +Pupa 1 0 0 +Simuliidae

Si.mulium spp. PT 0 J 3 1

Total Number/Sampler l63 200 240 201

i,p late sampler lost.?

1'0'. Indica tes less than one organism/ft- .

27

Table 10

Benthic oacroinvertehrates collected f l-om plate samplers in theConecuh-E scamhi a River just above Gay Lake (Station 3) ,

18 September 198(,

Plate SamplerRepl icate

AveragzTaxon Tolerance A B C D", No./ft

Turhe llarta PT 0 0 I +~';~':


Ephemeropt raUnidentified 0 1 3 1Baetidae

Baetis spp. PT 0 2 0 +Unident lEi.ed 3 0 15 r,

CaenidaeCaenis sop. PT 2 r, 2 3Heptageniidae

Stenonema spp. PT 3 3 6 401 i.goneur iidae

Isonychia spp. I 2 0TI· i.corythidae

Tricorythodes spp. PT 4 1 3 3

PlecopteraUnidentif led 0 0 +'?erlidae

A.c coneu ria spp. I I 0 0 +Neope rla s PI" I 0 1 0 +Paragnetina kansensis I 0 I 0 +

'IegalopteraCorydalidae

Corydallls cornutus PT 0 0 3

TrichopteraHydropsychidae

Chellmatopsyche spp. T 5 4 5 5Hyd ropsyche spp. PT 29 53 31 38~!ac ronema spp. I 2 4 1 2Unidenti Eied 60 15 I 152 12 I

28

Table 10 (continued)

Plate SamplerRepl icate

Taxon Tolerance A B CAveral'\~

No. / Et-

HydroptilidaeJlydroptila sop.

LeptoceridaeCeraclea spp.Oecetis sp.Unid en tif ie

Polycentropodidae~eureclipsis spp.

Pupa

PT 1

PT 0 2 l lPT 0 1 0 +

0 0 l +

T 3 I 01 4 1 Z

ColeopteraElmidaeAdults 2 o o +

Di.pteraChi rononid ae

Conchapelopia spp.Corynoneura spp.Cricotopus sp. tEukiefferiella sp.Nilotanypus spp.Polypedilum convictumRheocricotopus spp.Rheotanytarsus spp.Tanytarsus spp.Thienemanniella spp.


Simulium spp.Pupa

Total Number/Sampler

PTPTPTPTPTPTPTPTPTPT

PT

0 0 3 10 0 3 l0 2 3 20 2 0 +0 2 0 +5 1 l 19 120 2 0 +5 20 37 2l1 4 3 37 7 9 80 1 +2 2 3 2

54 15 200 906 2 29 12

119 308 540 322

*Plate saMpler lost.?

:':~:lndicates less than one organlsm/ft-.

29

Table 11

Renthic macroinvertebrates collected from plate samplers in theConecuh-Escambia River just below Gay Lake (S tation 4) ,

If! September 1986

Plate SamplerReplicatp

AveragzTaxon Tolerance A B C D No./ft

Oligochaeta T 1 1 0 +*

Hydracarina PT 0 0 0 1 +

CrhemeropteraHniden ti fied 2 1 3 2Baetidae

UnidentIfied 3 0 1 4 2Caenictae

Caenis spp. PT 6 2 0 2Heptae;eniidae

Stenonema spp. PT 0 0 2 0 +01 Lgoneuriidae

Isonychia spp. I 0 a 2 a +Tricorythidae

Tricorythodes spp. I'T 5 18 4 7

OdonataCoenagrionidae

Argia furnipennis PT 0 a 0 +Hac romiidae

lacromia spp. I 0 1 0 0 +

PlecopteraPerlidae

Acroneuria spp. I 0 1 0 3

Tr ichopteraUniden tifled 2 a 1 a +lIydropsychidae

Hyd ropsyche sop. I'T 1 0 0 1 +Unidenti fied a a 3 0 +

HydroptilidaeHydroptila spp. PT 1 0 a a +

30



Averag,Taxon Tolerance A B C D No. /ft-

LeptoceridaeNectopsyche sop. PT 1 0 [) 0 +Oecetis spp. PT 0 0 1 1 +

PolycentropodidaeNeureclipsis spp. T 3 0 0 0 +UnidentLfied 0 0 1 0 +

ColeopteraElm ldaeAdults [) n 0 +

DipteraChironomidae

Chironomini [) [) n +Cladotanytarsus spp. 4 2 2 3 3Conchapelopia sop. PT 0 0 1 0 +Corynoneura s pp. PT 2 0 1 1 1Cricotopus remus PT 1 0 0 0 +CricotoPllS sp. I PT 0 2 [) 0 +Dicrotendioes spp. T 0 2 0 0 +Nanocladius spp. PT 12 II 0 2 6Polvoedilum convictum PT 1 0 4 1 2Polvoedilum halterale PT 1 0 0 0 +Rheotanytarsus spp. PT 2 0 f, 11 2Tanytarsus spp. PT 6 [) 1 0 2Thienemanniella spp. PT 0 2 5 0 2

Adults 3 3 11 I 2Pupa 2 1 1 [) 1Simul iirlae

Simulium spp.Pupa 0 0 [) +

31

Table II (continued)


Taxon Tole ranee A B c DAvera gzNo./ft

MolluscaGas t ropoda

P lanorbidaeGyraulus spp.

PhysidaePhysa sop.


*lndicates less than Olle organism/ft 2 •

32

f) 0 0

o 0 a

58 35 57 23

+

+

43

Table 12

Benthjc macroinvertebrates collected from plate samplers in theConecuh-Escambia River .i ust below the CCA outfaJI (Station 5) ,

113 Septemer 1986


Avera!,,,Taxon Tolerance A B C D No./ft-

Tu rbe 11ari a 0 0 54 28 21

Oligochaeta 1'1' 76 128 4 20 57

HirurlineaGlossiphoniJ dae T 0 0 0 4 I

Os t racod a 0 0 26 79 26

EphemeropteraVniden tif led 32 28 0 f) ['j

Ca.:nidaeCaenis spp. pT 30 [4 [ [ [4

TricorythidaeTricorythodes spp. PT 28 48 9 I, 22

OdonataCorduliidae

Neurocordulia molesta 0 0 0 +,'l'

Plecopte raPerlidae

Acroneuria spp. I 0 0 0 +Neoperla spp. I 1 4 [

Nef';alopteraCorydalidae

Corydalus cornutus PT 0 0 +

TrichopteraHydropsychidae

Hydropsyche spp. pT 22 1 0 0 6Leptoceridae

Nectopsyche spp. 1'T 4 0 0 0 1Oecetis sp. PT 8 0 0 0 2

33


Pla te SamplerReolicate

AveragzTaxon Tolerance A '3 C 0 No./ft

PolycentropodidaeNeurecliosis spp. T 43 157 47 61 77

Pupa 0 I 0 0 +

Coleop teeaElmid ae n I n 5 2Adults 4 3 () I ~

DipteraPupa 4 0 a aCeratopogonidae

Palpomyia spp. PT () a () 4 IChi ronollri dae

Ablabesmyia parajanta PT 213 228 56 143 160Chironomus spp. T l2~ l14 63 hi 92Clinotanypus spp. 0 0 7 a 2Cryptochironomus rulvus PT 43 a () 20 16Cryptochironomus spp. PT 0 a 0 20 5Glyptotendipes spp. T 43 0 28 a 18Nanocladius spp. PT 171 38 0 0 52Parachlronomus monochromus PT 341 571 14 246 293Polvpedilum balterale PT 43 a a 20 16Tanypodinae 43 0 0 n II

Adults '1 n n 4 IPupa 60 92 12 4 42

~lolll1 scaGastroporla

Ancyl idaeLaevapex spp. a a 0 4 I

Phvs idaePhysa spp. 0 4 29 39 IS

34



Taxon Tolerance A B c DAverag~

No./ft-

PlanorbidaeGyraulus spp. 4 0 0 0

Unidentified 0 1 0 0 +

Pe l"cypoda I, 0 5 0 2

Total Number/Sampler 1346 1434 355 779 979

?,':1 ndlcates less than one organism/ft-.

15

Table 13

Benthic macroinvertebrates collected from plate samplers in theConecuh-Escamhia River one nile ciownstream from the eGA outfall

(Station 6), 18 September 1986

P late SamplerReplicate

Taxon Tolerance A B CAverag,No./ft-

Tli rbe 11ari a

Oligochaeta

Hyd rae rina

EpheoeropteraUnidentifiedCaenidae

Caenis spp.Heptageniidae

Stenonema spn.Tdcorythidae

Tricorythodes sop.

PT

T

PT

PT

PT

PT

0 0 +:',:':

5 0 8 I,

0 0 9 3

4 I, 0 3

0 1 0 +

1 2 0 1

3 17 20 13

OdonataCordliliidae

Neurocordulia molesta

PlecopteraPerlidae

Neooerla sop.Paragnetina spp.

~Iegaloptera

CorydalidaeCorydalus cornutus

II

PT

o

o1

1

1

no

o

o

Io

1

+

++

+

Trichopte l~a

Brachycen t ri.d aeBrachycentrus spp.

Hyd wpsychid aeCheliMatopsyche spp.Hydropsyche spp.Unidentified

I

TPT

36

3 0

1 034 20

152 245

o

o1432

Table l3 (continued)


Taxon

LeptoceridaeCeraclea spp.Oecetis sp.

Polycentrnporllrlae~eureclipsis spp.

Pupa

Tolerance

PTPT

T

A

o1

oo

lJ

11

o1

C

o8

2o

Averaf!.'iNo./ft-

+3

++

ColeopteraDytiscidae o o 1 +

DipteraChi ronomid ae

Chironomus sop.Conchapelopia spp.Nanocladius spo.Parachironomus monochromusPolypedilum convictumRheotanytarsus spp.Thienenanniella SpOe

AdultsPupaStmul i i.dae

Sinulium spp.Pupa

TPTPTPTPTPTPT

PT

o 14 I)

8 0 2059136199o 0 20

1713615993 54 8025 0 20o 0 8

11, 24 8

14 to 01 2 I)

59

1317

1047615

315

81

HolluscaGastropoda

l\ncylidGleLaevapex spp. o o +


*Plate sampler lost.**lndicates less than one organism/ft 2 .

37

437 670 611 573

Table I'

Renthic macroinvertebrates collected from plate samplers in theConeclIh-Escambi.a River above mouth of Little Escambi a Creek

(Station 7), IR September 1986

Taxon

Turbellaria

Oligochaet;'l

Hydracarina

EphemeropteraUnidentifiedBaetidae

llnidenti fledCaenidae

Caenis sop.H pt agen U dae

Stenonema spp_Tricorythldae

Tricorythodes spp.

Plate SamplerReolicate

Ave rag,Tolerance A B c* D~: No./ft-

PT 0 2

T 7 4 6

PT 1 0 +i:'!':

0 3 2

16 R 12

PT n +

PT 6 9 8

PT 6 8 7

PlecopteraPerlidae

Attaneuria ruralisParagnetina spp.

tlegalopteraCoryda lldae

Corydalus cornutus

TrichopteraBrachycentridae

Rrachycentrus spp.Hydropsvchidae

Hvdroosyche SOD.Leptoceridae

Oecetis sn.

II

PT

I

PT

PT

38

oo

I

1

48

11

1

Q

88

o

++

1

+

68

+


Plate SaMplerReplicate

Taxon

ColeopteraElmidaeAdultsGyrinidae

Dineutus spp.

Tolerance

I

A

II

I

B

1o

o

Ave ra!(ZNo./ft

I+

+

DipteraChi ronolllidae

Polypedilurn convictumRheotanytarsus spp.Thienemanniella spp.

AdultsPupaSimul i. idae

Simulium spp.Pupa

PTPTPT

PT

25 f\7 5645 87 6660 7 34

1 0 +7 2 5

14 10 120 2 I

HolluscaGastropoda

Ancyl idaeLaevapex spp.

PhysidaePhvsa sop.

Total Number/Sanpler

*Plate sampler lost.**Indicates less than one organism!ft 2 .

39

o

o

243 323

+

+

283

Table 15

Benthic macroinvertebrates cOllec ted from plate sample rs in theConecuh-Escambia River three-folll'ths mile upstream of the

Pipeline Crossing (Station 8), 18 September 1986


AveragzTaxon Tolerance A B C D No./ft


EpheflleropteraUnidentifled 2 0 0 4 2Bqetidae

Unidentified 0 2 8 3Caenidae

Caenis spp. PT 0 0 2 +--,

HeptagenlLdaeStenonema spp. PT 8 17 3 7 9

Tri cory t hid a eTricorvthodes spp. PT 13 16 5 14 12

Hegalopte,-aCorydal idae

Corydalus cornutus PT 1 0 0 0 +

TrichopteraUnidentified 6 0 0 0 2Bra chycellt r idae

Brachycentrus spp. I I) I) I) +Hydropsychidae

Cheul'latopsyche spp. T I) I) I) I +Hydropsvche spp. PT 3 0 1 2 2lInid en t l tied 12 31 2 44 22

LeptoceridaeNectopsvche candida PT 0 0 2 0 +Nectopsyche spp. PT 1 0 2 0 +Oecetis sp. PT 1 2 I) 1

PolycentropodidaeNeureclipsis spp. T 4 1 3 0 2

Pupa 0 0 I 0 +

40



AveragzTaxon Tolerance A B C [) No./ft

ColeopteraElmid ae 0 [) 0 l +Adults 1 0 0 5 ~

[)ipteraChi. ronoloidae

-\blabesmyia parajanta PT 3 (1 0 0 +Chi ronomi ni 0 0 2 n +Chironomus spp. PT 0 2 0 2 1Corynoneura spp. PT 5 0 3 0 2Nanocladius spP. PT 2 2 [) 11 1Nilotanypus spp. PT 2 0 [) n +Nilothauma spp. rT [) 0 [) 2 +Pentaneura spp. PT 0 0 2 0 +Polypedilum convictum PT 2 2 2 11 4Rheotanytarsus spp. PT 7 13 7 16 11Tanytarsus spp. PT 0 5 3 5 3Thienemanniella spp. PT 3 ~ 5 9 5

Adults 0 0 0 2 +Pupa 1 l 2 2 2Simuliidae

Simulium spp. PT 2 (1 0 0 +

HolluscaGastropoda

AncylidaeLaevapex spp. 1 8 [) 3 3

Total Number/Sampler ill 107 53 l41 96

?:<:Indicates less tlldn one organism/ft-.

41

Table 16

Benthic mac ro inve rte bra tes collected from plate samplers in theConecuh-Escambia River jus t upstream of Century lIridge

(S tation 9) , IB September I QS6


AveraglJTaxon Tolerance A II C D No./ft"

OlLgochaeta I J 2 2 S 4

Hydracarina PI 3 5 0 2 3

EphemeropteraUnid en tlf ied 7 0 0 0 2Baetidae

Unident Lfied 5 0 2 4 3Caenidae

Caenis spp. PT 1 0 2 0 +~.{

Heptageni LdaeS tenonema spp. PT 15 6 0 4 6

01 ig onelj r i.irlaelsonychia spp. I 0 I 0 0 +

TricorythidaeTricorythodes snp. PT 8 17 3 29 14

PlecopteraPe rlidaeUniden ti fLed 1 0 0 0 +

HegalopteraCorydalld ae

Corydallis cornutus PT 1 2

TrichopteraHvd roosychid ae

Chellmatopsyche spp. T 0 J 0 0 +Hydropsyche spp. I' 13 22 27 45 27Uniden t Lfied 113 120 72 220 131

Hyrl roptil idaeHydroptila spp. PT 2 LL 0 J 4

42


Plate SamplerRepl lca te

ToleranceAverag2

Taxon A B C D No./ft

LeptoceridaeCeraclea sop. PT 2 0 0 0 +Oecetis sp. PT 0 2 0 0 +

Pupa 0 2 l 2 1

ColeopteraDytiscidae 0 () 0 2 +Elmi.daeAdults 0 0 0 +

DipteraChi. ronomidae

Euki.ef feri.ella spp. PI 14 12 21 26 18Nilotanypus s Pl" PT 0 0 () 13 3PolypediluM convictum PI 233 146 1"6 211 194Rheocricotopus spp. PT 0 () 10 0 3Rheotany t a rSllS spp. PT 82 L34 2l 26 66Tanyt a rsini 14 0 0 0 4Thienemanniella spp. PT 0 0 21 51 t9

Adults 0 2 0 I +Pupa 4 4 2 10 5Simul lldae

Simulium spp. PT 66 102 4 96 67Pupa 1 6 0 2 2

fl.folluscaGast ropoda

AncylidaeLaevapex spp. 1 2 () 2

'fatal Number/Sampler

7*Indicates less than Qile organism/ft-.

41

5R9 600 17 76t 582

Table 17

Benthic macroinvertebrates collected from plate samplers in tIleC:onecuh-Escambia River at Pine Harren, Florida (Station LO))

tR September 19~6

Plat" SamplerReplicate

Taxon

Oligochaeta

EphemeropteraUnidentifiedBaetidae

Uniden tiE ledCaen i.dae

Caenis spp.Heptag niidae

Stenonema spp.01 igoneur i.idae

Isonychia spp.Tricoryr hidae

Tricorvthodes spp.

PlecopteraPedidae

Neopeda spp.

HegalopteraCorydalid ae

Corydalus cornutus

Trichopte raBrachycentridae

Brachycentrus spp.Hyd ropsychidae

Cheumaropsyche spp.Hydropsyche spp.Hacronema spp.UnldentiEied

Hvdropti lidaeHvdroprila 51'1"

Tolerance

T

PT

PT

I

PI

I

PI

I

TPTI

PT

44

3

5

18

5

1

2

2

2

2

o2

II5

o

B

o

5

to

t8

6

9

5

o

310

724

1

C

o

o

1

25

10

o

t4

o

1

(]

o27

16

I)

AveragiNo. / ft

3

5

20

7

+

2

1

158

15

+



Averag2Taxon Tolerance A B C D-;'-r No./ft

Leptoceri.daeCeraclea spp. PT 0 I 0 +Nectopsyche spp. PT 2 5 0 2Oecetis sp. PT 1 1 0 +Oecetis spp. PT 1 1 0 +Adult 0 1 0 +

PhilopotamidaeChimarra spp. I 0 1 0 +

ColeopteraElmidae 0 +Gyrinidae

Dineutus spp. I 0 0 +

DlpteraChi ronomid ae

Ablabesmyia parajanta PT 6 0 0 2Conchapelopia spp. PT 6 13 0 6Corvnoneura spp. PT 0 () 5 2Cricotopus sp. I PT 6 0 0 2Nanocladius spp. PT Ij 13 0 6Polypedilum convictum PT 57 147 45 83Rheotanytarsus s pp. PT 44 161 27 77Tanypodinae 0 0 5 2Tanytarsus spp. PT 0 0 5 2Thienemanniella spp. PT 38 0 32 23

Adults 0 0 9 3Pupa 5 9 4 6Simuliid ~e

Simulium spp. PT 39 231 48 106Pupa 2 19 0 7

45

Table [7 (continued)


Taxon

!1011uscaGastrop da

Ancyl idaeLaevapex spp.

Tolerance A

o

B

1

c

o

D*Averagf)'1o./ft-

+


*Plate sampler lost**lndicates less than one organism/ft 2 .

273 706 256 412

Table 18

Ben thi.c rna c ro inve r te brrt t es collected froPl plate s.:t.mplers ill theConecuh-Escambia River at Nalina, Flori.da (Station 11 ) •

18 September 198(,


AveragTaxon Tolerance A B C D No.!ft-

Hyd racarina PT 0 2 4 I) 2

EphemeroPteraUnidentif ied 2 8 2 3Baetidae

Baetis spp. PT 0 30 0 0 8Uni.dentified 21 0 8 1.8 12

CaenidaeCaenis spp. PT 21 10 16 12

Heptagen LidaeHeptagenia spp. PT 0 3 0 0 +"Stenonema spp. PT 5 3 0 3 3Unidentified 0 ] 4 I) 2

OligoneuriidaeIsonychia spp. I 0 2 0 2

T r ie Drv t hidaeTricorythodes spo. PT 4 4 12 4 6

OdonataZygoptera 0 0 0 +

PlecopteraUnidentified 0 0 6 I) 2

Attaneuria ruralis I 0 I) 1 0 +Neoperla spp. I 0 0 0 l +

~·Iegalopte raCorydalidae

Corydaills cornutus PI 0 7 2 ]

TrichopteraUnidentlE ied 0 0 4 0Brachycent ridae

Brachycentrus spp. I 1 0 0 2 +

47



AAveragz

Taxon Tolerance B C D No./ft

HydropsychidaeHydropsyche spp. PT 10 i 1 i 6Hacronema spp. I 4 4 2 5 4UnidentifLed 12 15 8 12 12

Hyd ropti 1 idaeHyd roptila spp. PT a 6 0 4 3

LeptoceridaeCeraclea spp. PT a a a 2 +Nectopsvche spp. PT 0 0 0 1 +Oecetis sp. 1'T 0 1 0 1 +Oeceti.s spp. PT 2 0 0 a +

Philopa tamid aeChi.marra spp. I 0 5 2

ColeopteraElmid ae 3 0 0 I 1Adults 0 0 4 1 1

DipteraChi ranomid ae

'\blabesmyia para.ianta PT 0 4 0 0 1Nanocladius spp. PT 0 12 12 8 8Orthocladi inae a 0 12 0 3Pentaneura spp. PT 0 0 0 8 2Polypedilurn convictum PT 22i 35 2M, 131 159Polypedilum halterale PI 0 0 0 8 2Rheotanytarsus spp. PT 23 35 0 24 21Tanytarsus spp. PI 0 0 12 0 3Thienemanniella spp. PT 34 12 12 10 19

Adults 0 1 0 0 +Pupa 4 0 16 1 5Simul Lidae

Simulium spp. PT i6 69 2L, 1i 4iPupa 4 5 4 0 3

48

Table 18 (cont[nued)

Plate SamplerReplica te

Taxon Tolerance A B c DAveragzNo./ft

UnIden ti fied insect larvae 0 1 0 0 +

'loll uscaGast ropodaAncylidae

l..aevapex spp. 0 5 () 2

Total Number/Sampler 455 261 421 299 359

7~'(lndicates less than one organ [sm/ ft-.

49

Table 19

Benthic macroinvertebrates collected frol!l plate samplers i.n theConecuh-E scambia River near Cottage Hill Landing

(Station 12) , 18 Se ptember 1986


Avera gzTaxon Tolerance A B C D No./ft

Amphipoda 0 0 0 1 +~I:

Hyd ra ca ri. na PT 1 0 2

E Pheme ro pte raUnidenti Eled 3 3 4 2 3Baeticlae

Baetis spp. PT 0 0 10 0 3Unidentified 1 6 0 0 2

CRenidaeCaenis spp. PT 4 22 4 34 16

HeptageniidaeStenonema spp. PT 5 0 2 2 2

01 igoneuri telaeIsonychia spp. I 0 0 +

Tr lcorythidaeTricorythodes spp. PT 3 20 2 20 11

OdonataCoenagri onidae

I\rgia spp. PT 0 0 0 1 +Cordllilidae

Neurocordulia molesta PT 0 0 0 1 +

TrichopteraUniden tiE led 0 4 4 0 2lIydropsychidae

llyd ropsyc he spp. PT 0 1 0 0 +Hacronema spp. I 2 I, 3 0 2Unidentified 0 5 0 4 0

L

Hydropti UdaeHydroptila spp. PT 0 11 5 6 6Pupa 0 1 0 1 +

50



TaxonAvera~2

Tolerance A B C D No. lEt

LeptoceridaeNectopsvche sop. PT a 2 2 a IUnidentified a a a 6 2Pupa I a a a +

PhilopotamldaeChimarra spp. I a a 1 (] +

PolycenrropodidaeNeureclipsis spp. T l I 9 7 2l 12

Pupa 3 a a a +

ColeopteraUnidentified a a a 2 +Elmidae a (] a 8 2Adult I (] (] 5 2

DlpteraChi ronomid ae

Ablabesmyia parajanta PT 7 32 16 10 16ericatapus bicinctus T a a 8 a 2Cricotopus remus PT 2 a 8 20 8Cricatopus s p. I PT 7 2 l 8 149 46Corynoneura s pD. PT a a 8 a 2Cryptochironomus fulvus PT a a a 10 3Dicrotendipes lobus T (] 2l a a 5Nanocladius SDp. PT 2 a 16 lO 7Nilo tanypus spp. PT (] 5 a a lNilothaurna spp. 2 a a (] +Polypedilum convictum PT 5 a l6 a 5Polypedilum halterale PT 2 5 a (] 2Pseudochironomus spp. T 2 0 0 10 3Rheotanytarsus spp. PT 5 5 0 0 3Tanytarsus spp. PT 2 16 8 20 l2Thienemanniella spp. PT 22 26 lO l 0 37Tribelos fuscicornis PT 0 a 8 () 2Xenochironomus xenolabis 0 0 0 20 5

51



Taxon


Simulium spp.

Tolerance

PT

A

o1

o

R

n1

o

c

2J

1

D

(1

6

o

Averag2No./ft

+3

+

MolluscaGastropoda

Ancyl idaeLaevapex spp. 1 o o o +

Pelecypoda


*Indicates less tl13n one organism!ft2

•

52

1 0 0 0

97 221 248 371

+

234

ITON. ALARAl-I. 19% the period of low river flO',] ... (Simulium sop. and various mid~es). The...

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