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ABSTRACT

I

I I

I I I

IV

V I I

V I J . t

6 .

1

8 - 3 7 .

Rainfal l recordedDis t r i c ts o fe><pressed asfrom Normal

CONTENTS

Nlxrbers of

annually in Meteorologicalthe south-v tes t , 1913 to 1981,Percentage Departures

dep ths . . .

1 9 8 r . . .

of gauged

Pag e

f

6

6

7

9

9

v

VI

INTRODUCTION

RAINFAIL, IIIETLANDS AND

DUCK SHOOTING SEASONS

VARIATIONS IN RAINFATL

WATERFOWL BREEDING

AND CONDITIONSrOR BREEDING

ASSESSMENT OF CONDITIONS

USE OF RAINFALL DATA IN ASSESSMENT OFCONDI TIONS

CONCL T'S ION

ACKNOWLEDGEMENTS

F'IGURES

Boundaries of the South-West ani l EuclaLand D iv i s ions . .

nainfal l recorded in the south-west ofw.A. , 19 81 and Normal

Distr ibution of Deci le Range

Normal

I I

1 .

2 .

J .

Page

l 3

1 4

1 5R a i n f a l I , 1 9 8 I . . .

4. Rainfal l recorded nonthty in MeteorologicalDistr icts of the south-west, 1981 and

1 6

f , .

cunulat ive percentages of wetland

Depth of gauged vtetlands, Novernber

Depth, sal ini ty and PH variat ions

I 7

2 0

2 2

2 3wet lands , 1978 to l98 I

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t t l a t e r T e v e I s o f g a u g e d w e t l a n d s o f t h e s o u t h c o a s tf r o m A I b a n y t o E - s p e l a n c e w e r e s i m i - l a r t o o i b e l o wt h o s e o f 1 9 8 0 . A l l w e r e b e T o w 1 9 7 9 I e v e - l s , s o m en a r k e d T y s o .

S u n n a r i z i n g , 1 9 8 1 s a w a s u b s t a n t i a - l ( a n d i n s o m ec a s e s , d r i m a t i c ) i n p r o v e m e n t i n t h e c o n d i t i o n o fw e t l a n d s i n c e n t r a - l a n d n o r t h e t n a r e a s o f t h es o u t h - w e s t t o p r e - 1 9 7 8 . l e v e . l s , ' a . l e s s s u b s t a n t i a lb u t s i g n i f i c a n t i n p t o v e m e n t i n t h e c o n d i t i o n o fw e t l . a n d s i n s o u t h e r n a . r e a s ; a n d a f u r t h e t , s t i g h td e t e r i o r a t i o n i n c o n d i t i o n s o n t h e s o u t h c o a s tf r o n A l b a n y t o E s p e r a n c e .

A s a r e s u . l t o f t h e i n p r o v e d c o n d i t i o n s f o rw a t e r f o w l d u t i n g 1 9 8 1 , a R e s t r i c t e d d u c k - s h o o t i n gs e a s o n w a s d e c f a r e d f o r t h e s u m m e r o f 1 9 8 1 - 8 2 .

Th is pub l i ca t i on has been p repa red fo r t he duck -shoo t i ngc o m m u n i b y , a n d f o r o L h e r s w h o s h a r e a t ) i n t e r e s t , e i t h e ro ro fess iona l o r amateu r , i n t he managemen t o f wa te rb i rds andwe t lands i n wes te rn Aus t ra l i a . The a ims o f t he documen t a retwo fo ld :

i ) T o b r i e f l y e x p l a i n t h e b i o l o g i c a l p r i n c i p l e s u p o n w h i c hdec i s ions couce rn ing duck -shoo t i ng seasons i n the

' sou th -wes t o f t he S ta te a re based , and

i i ) To desc r ibe , by the use o f g raphs , t ab le and d iag ra tns , t hecond i t i ons fo r wa te r fow l wh ich p reva i l ed du r ing the L2mon ths p r i o r t o de te rm ina t i on o f t he 1982 duck -shoo t i ngseason .

T h e r e p o r t r e l a t e s o n l y t o t h e s o u t h - w e s t o f t h e S t a t e . t h a ti s , t he Sou th wes t and Euc la Land D iv i s ions . A con t i nuous openseasoD app l i es i n t he rema inde r o i t he S ta te due to the vas tareas and- very smal l number of inhabit-ants j 'nvolved and to thed i f f i c u l t y o f a c c e s s t o m o s t b r e e d i n g a r e a s f o l l o w i n g r a i n -The repo i t q i ves l i t t l e a t ten t i on to the eas te rn ha l f o f t heE u c l a i a n d S i v i s i o n ( i . e . t h e N u l l a r b o r P l a i n ) a s r a i n f a l l r nth i s a rea i s genera l l y l ess than 250 mm per annum and we t landsa re v i r t ua l l y non -ex i s ten t .

INTRODUCTION

I I RAINFAI,L, WETLANDS AND WATERFOWI, BREEDING

na in fa l l i n t he sou th -wes t o f Wes te rn Aus t ra l i a i s na rked lyseasona l . On ave rage , app rox ima te l y 70 t o f t he to ta l annua lra in fa l l occu rs du r ing the mon ths May to Sep tember , w i th 35 tbe ing reco rded du r ing June and Ju l y . As a consequence the

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IV VARIATIONS IN RAINFALL AND CONDITIONS FOR BREEDING

R a i n f a l l , o f c o u r s e , v a r i e s f r o m y e a r t o y e a r ' a n d a s a

consequence so does the ava i l ab i l i t y o f wa te r f o r b reed ingpurposes . Thus i n yea rs o f ave rage o r be t te r - t han -ave rag ei " i i t a f f , coud i t i ons fo r wa te r fow l b reed ing a re usua l l y good

and the number o f young p roduced i s h igh ; whereas , i n yea rs o fe x c e p t i o n a l l y l o w i a i n t a t t , l i t t f e s u r f a c e w a t e r i s a v a i l a b l eand p roduc t i on i s g rea t l y reduced .

Duck -season dec i s ions mus t t ake these va r iab le cond i t i ons i n toaccoun t . I n wes te rn Aus t raL ia the p rac t i ce now i s t o dec la reFULL SEASONS when condit ions for breeding ha-.ze been average orbe t t e r - t han -ave rage . RESTRICTED SEASONS when co t rd i t i ons havebeen poo r , and No SEASONS when cond i t i ons have been pa r t i cu la r l yp o o ,

' f o . a n u m b e r o f y e a r s ' T h e p r i n c i p a l o b j e c t i v e o f t h i s

s y s L e m i s t o e r l s u r e C f r a t s h o o L i n g d o e s n o t c a u s e a s e r i o u sr lduc t i on i n t he s i ze o f t he b reed ing s tock du r ing d ry yea rs o rpe r iods o f p ro longed d rough t . Spec i f i ca t i ons fo r FULL 'RESTRICTED ATTd NO SEASONS ATE AS fOI IOWS:-

FULL SEASON RESTRIC' IEDSEASON

NO SEASON

n n ^ n i h d n r f o

open ing Day

open ing T ime

Season Leng th

Bag L im i t

2nd weekendr r r ! J c r r r qc r ! ) l

6 , O O P M

10 weeks

1 0 b i r d s o fany game

2nd weekendr r t u d r r u a r ) l

Sunday

6 . 0 0 A M

4 weeks

5 b i r d s o fany game

V ASSESSI'TENT OF CONDITIONS

Pr io r t o 1978 cond i t i ons fo r wa te r fow l b reed ing were assessedeach yea r t h rough g round and ae r ia l su rveys o f impor tan twa te r fow l s i t es . Wate r l eve l s \ 4 re re reco rded as d ry , l ow ' ha l ff u1 l , h igh o r f u l l . No tes were a l so made o f wa te r fow l numbersand . where poss ib le , wa te r fow l b reed ing ac t i v i t y .

I n Lg77 the au tho rs dec ided tha t a more p rec i se sys tem o fevaluat ion was required and so undertook a progratnme ofi ns ta l l a t i on o f dep th gauges on se lec ted we t lands . Gauges wereins ta l l ed on 27 we t lands f rom November 1977 Lo December 1978a n d a g a i n i n I 9 7 9 a n d 1 9 8 0 , a n d o n 2 8 w e t l a n d s i n I 9 8 1 . T e n.o re

- . t e p roposed fo r L982 . Th i s w i l l co rnp le te the gaug ing

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R e s t r i c t e d o r N o S e a s o n s , a s a p p r o p r i a t e . R a i n f a l I d a t a a n dwe t land mo t t i t o r i ng da ta a re now used as a bas i s f o r de te rm in ingthe t ype o f season to be dec la red each yea r .

The da ta co r t t a ined i n the rema inde r o f t h i s repo rE (F igu res1 -38 , and Tab le 1 ) were p resen ted to the November l 98 l mee t ingo f i f t " W . A . w i l d f i f e A u t h o r i t y ' s B i r d C o m m i t t e e t o a s s i s tmenbers o f t ha t Commi t tee i n t he i r co l r s ide ra t i on o f t hep roposed 1982 duck -shoo t . i ng season .

Fo l l ow ing the B i rd Commi t tee mee t ing , t he M in i s te r f o rF i s h e r i e i a n d W i l d l i f e , M r G o r d o n M a s t e r s , a n n o u n c e d aRes t r i c ted duck -shoo t i ng season in the Sou th -Wes t and Euc laL a n d D i v i s i o n s o f t h e S t a t e . T h e i u l l t e x t o f t h e M i n i s t e r ' smed i -a re lease was as fo l l ows ;

T h e M i n i s t e r f o r F i s h e r i e s a n d W i l d l i f e , M r G o r d o nM a s t e r s , h a s d e c l a r e d a I 9 8 2 d u c k s h o o t i n g s e a s o u f o rthe Sou th wes l and Euc la l and d i v i s ion .

Mr Mas te rs sa id today tha t desp i te con t i nu ing d rough tcond i t i ons i n t he Sou th wes t and spec ia l l y a long thesou th coas t he had dec ided tha t a res t r i c ted duckshoo t ing season shou ld be dec la red fo r nex t yea r .

The season wou ld open a t 6 am on Sunday , January 107and wou ld c lose a t 11 .59 p rn on Sunday , Feb rua ry 7 .

The da i l y bag l i r n i t i s f i ve b i rds o f a dec la red gamespec ies , w i th no bag l im i t on the Moun ta in Duck .

am con f i den t t ha t spo r t i ng shoo te rs p lann ingexped i t i ons du r ing the season w i l l obse rve the bagl i m i t t o m i n i m i s e s h o o t i n g p r e s s u r e o n g a m e d u c k s ' "

M r . M a s t e r s s a i d .

" I t i s impor tan t t ha t b reed ing s tocks a re ma in ta inedfo r f u tu re seasons .

more no rma l ra in fa l l and we t land cond i t i ons ' i t w i l lbe poss ib te to dec la re a fu l l duck shoo t i ng seasono n c e a g a i n . "

T h e M i n i s t e r s a i d t h a t w h i l e d i s t r i c t r a i n f a l la v e r a g e s i n l 9 8 l w e r e , i n m o s t c a s e s r h i g h e r t h a nthose reco rded i n 1979 and 1980 , none exceeded thelong - te rm ave rage .

"wh i l e t h i s resu l ted i n improved we t lands cond i t i onsin the cen t ra l and no r the rn a - reas o f t he sou th -wes t 't he re was a Iess subs tan t i a l improvemen t i n sou the rua reas r and a fu r the r s l i gh t de te r i o ra t i ou i ncond i t i ons on the sou th coas t f rom A lba t r y t oEspera l ' l ce . "

M r l q a s t e r s s a i d t h e d e c i s i o n t o p l a c e n o b a g l i m i t o nMour"r tain Ducks was taken because numbers had bui l t up

I O

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, sr(31:ng pue sf ue1 3:o -

lirauil:edeo eql Jo ?f,eus uoq :W pue :e'{ncppuoqu sW 'eaep TIel:uTP.1 6u1,t1ddns :o; z16o1o:oalaw Jo nea 'rngq 11e e a,ruor:ruro J aqf lueql 01 aITT osTe p T-noA eM 'lsaA-qlnos 0q? foJd,itrr"^ pe6ne6 go 6u1:o1'5uotu aq? u1 6u11s1sse trq peprao:d aaeq

,(5q1 qc'5qar uorlnqT.rluoc aTqenTea eq? -rol: 'cur uoTf PTcossv auecpue p1ai.4 uerTErlsnv ?sa!4 aq1 Jo slequeu ruBql 01 a{1T prnon aM

SilNsI{EI9qs TIIIO I\DI ilt

'sarcads eure6 Pa:e1cap e fo s1cnpua? Jo 1tur11 6eq ,{11ep e qlTA uos€es uado 6ulnurluoce paJeTcep seq s.ra?sew JW.- suoTsrArp pueT ufelspgpue lseM-ql.:oN ' Ial.raqury - a1e1s eq1 Jo ? so] aq1 loJ

'PTcng Jo ?see puP

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N()RMAL

1981

lm o :00

Kilometrss

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FIGURE 2 Rainfall recorded (mm) in the south-w€€t of Westorn Australia, Jan.-Oct. 1S1 and J.n.-Oct. Normal

1 4

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39VUIAV 3AO8V HSnv{ ASIA

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I { r 0 l J I t r i l r A I M r J I J r A r S r 0 |I 1381

FIGURE 4

lm

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Roinfall recorded monthly in 6ach of th€ five Met6orological Districts of th€ south-ws8t, Novomber l98O to Octobgr 1981 and Novsmb€.to October Normal. Percentage departurgs from Normal (Jan.-Oct.) for each Meteorological District are also shown.

N(]RTH C()ASTAT-s%Jr!.0d

Itt

1 6

LI

PERCENTAGE DEPAFTURE FBOM NORMAL

ltllt +++++++++8E986 d8888gtstA

::6)

93 ig.ng Ede€ iiaPS E.qdi E PiE 3t:.3 t g

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WETLAND WETLAND NAI4ENo.

DEPTH (netres )

NOV NOVL979 1980

MAX IIITJMRECORDEDNOV-JANDEPTHDECREASE(metres )

NOVL978

NOVl- 981

l-2?

5o7

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1 0'I 1

L 21 3t-4I 5L b

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LOGUECAPAMAI]RAEGANUP INJARREGASTREETSHINDSNINAN

MOLLERINWAI,YORMOURINGCAIVTP I ONNOONY ING

DOBADERRYBEVERTEYMEARSNONALL ING*BROWNYEATERINGDULBINNINGTOOL IBINWALBYRINGTAARBIINBOKANLITTLE WHITEK!\IOBRUPCOYRECUPCAS UARINACOOIVIELBERRUPCOBL ININEDUMBLEYIJNGGUNDARINGPARKEYERRI NGFLAGSTAFFWARDERINGQUE EREARRUPMARTINUPWEST ARTHUR 5456TOWERINNINGKONDINI NGOUNTER

PALLARUPK E N T 2 9 0 2 0

1 . 7 8

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0 . 8 10 . 2 0

DRYDRYDRYDRYDRYDRYDRY

DRYDRYDRYDRY

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0 . 5 00 . 5 40 . 4 3

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u - z )n q q

0 . 6 0o . 2 60 . 9 9u . f /0 . 3 30 . 8 01 . 1 00 . 6 20 . 1 0< 0 . 0 2< 0 . 0 7DRY

TABLE 1 : Novernber dePthsF iqu re 38 ( fo ld -ou t nap a t

o f rnon i to red we t lands ; I 978 - I981 . Re fe rend o f repo r t ) f o r we t l and l oca t i ons .

*Nona l l i nq Lake ' s ou t l e t was "dammed " p r i o r t o w in te r o f 1979 '

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1980ln = 691

j'

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1981{n= 103)F

3 b U

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0 . 0 0 5

2 .O 25 3 .0DEPTH lmstresl

DEPTH {met|€6)

0.5

3 6 0

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FIGURE 6CUMULATIVE PERCENTAGES OF WETLAND DEPTHS. "',n" is the rotal number o{ wetlands monitorecl'

This figure shows, for example. that in September 1S0 64% of monitored wetlands had depths ol less than

0.5 m, whereas in Septembsr'1981, only 32% were less that 0 5 m deep. Thus conditions ovorallwere "wetter"

in Seotember 1981 than Ssotsmber 1980. Similar comparisons can be made lor July and Novembor.

SEPTEMBER

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FIGURE 7 . Depth of gauged wetlands, November 1981 (first week)

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FIGURE 10. LAKD PTNJARREGA (No. 4)

FIGURE 11. LARE HINDS (No. 6)

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,ruodau · 2005-12-28 · ttlater TeveIs of gauged wetlands of the south coast from AIbany to...

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Transcript of ,ruodau · 2005-12-28 · ttlater TeveIs of gauged wetlands of the south coast from AIbany to...