HAB Bulletin [status of harmful and toxic algae]

Week runs from Sunday to Saturday

Ireland: Predictions

ASP event: Moderate watch precaution on all shores.

AZP event: Low ,precautionary.

DSP event: Highest SW, W, NW. Moderate all remaining areas.

PSP event: Highest SW site specific. Low to moderate elsewhere .

ASP: Continued moderate caution until trend establishes. Patches , below regulatory limits , occurring around entire coastline, related to environmental transitory conditions.

AZP: No change- 2 wk. trend. Continued negligible levels of toxins present in samples tested ,with no clear presence trend. This species has caused sudden acute issues in the past and rarely presents any reliable trends.

DSP: Highest caution in affected areas. Continue cell presence but beginning to clear slowly. Highest SW and W, now experiencing closures as indicated, and moderate throughout all coastline. Toxin levels traditionally have shown ability to bounce from low to high during natural depuration period , so full caution advised during this time.

PSP: No Change- 3 week trend. Highest SW region, see specific sites. Suitable environmental conditions may increase risk – adjacent sites’ caution advised. Low elsewhere. Alexandrium cells can occur in both toxic and nontoxic forms, and while currently most toxin levels remain negligible, this could change rapidly.

Blooms: High : Both insitu or transported ashore .Both beneficial and detrimental blooms may occur in areas of good growth and suitable environmental conditions. Transient wind driven blooms of some species may temporarily accumulate on shores. Any unusual water discoloration should always be noted and regional labs contacted if concerned /regarding possible need for additional sampling. All feedback is welcome at Joe.Silke@Marine.ie

NMP Current closures

ASP AZP DSP PSP

0 0 2 0

Week 29: July 12th – 18th 2020

Based on sites tested

HAB Bulletin [status of harmful and toxic algae]

National Monitoring ProgrammeHISTORIC TRENDS

ASP events: mid-March to early May

AZP events: April to December

DSP events: May to December

PSP events: June to mid-July and end September. Predominantly in Cork Harbour.

AZP

DSP

PTX

ASP

PSP

Levels from week 1 to present week. Regulatory limit - - - - - - -

DSP and Dinophysis sp. current trends

Ireland HAB & Biotoxin Distribution maps

[current status of harmful and toxic algae]

Phytoplankton species – last 3 wks.

All levels of DSP biotoxin recorded - last 3 wks.

Current closures levels≥ DSP 0.16 µg/g

CommentsWk. 29 – Continued highestcaution. Dinophysis cellscontinue to be present inaffected areas. This toxin hasbeen known to cause bouncingin levels as it clears once celllevels drop significantly . Areasadjacent to closed areas shouldexercise high caution also. Thisis the historical season andenvironmental conditions aresuitable . Highest caution andgood sampling advised untilcells decrease completely.

Ireland HAB & Biotoxin Distribution maps

[current status of harmful and toxic algae]

Phytoplankton species – last 3 wks. All levels of AZP biotoxin recorded - last 3 wks.

AZP and Azadinium like species current trends

Current closures levels≥ AZP 0.16 µg/g

CommentsWk. 29 - Continuednegligible toxin levelscurrently . No clear trendestablished. Westernshorelines showing 2 weekpossible increase inpotential cells.

ASP

Ireland HAB & Biotoxin Distribution maps

[current status of harmful and toxic algae]

ASP and Pseudo nitzschia sp. current trends

Current closures levels≥ASP 20 µg/g

CommentsWk. 29: - Continuedprecautionary moderatewatch level caution in allaffected areas due toincreases in cell presence andfluctuating trends. Currentlyonly low levels of toxinsobserved.

Phytoplankton species – last 3 wks.

All levels of ASP biotoxin recorded – last 3 wks.

Ireland HAB & Biotoxin Distribution maps

[current status of harmful and toxic algae]

PSP and Alexandrium sp. current trends

Phytoplankton species (last 3 wks.)

All levels of PSP biotoxin recorded (last 3 wks.)

CommentsWk. 29 –Continued highest

caution advised in SW areaswith high potential cell levels.Adjacent sites should alsoexercise additional cautionduring favourableenvironmental /transportconditions. Elsewhere lowlevels of insitu potential cellsobserved. This is now thehistorical period of occurrenceand localised issues can occurrapidly in specific sites .

Current closures levels≥ PSP 800 µg/Kg

Ireland Fish killing phytoplankton Distribution maps

[current status of harmful and toxic algae]

Karenia mikimotoi

(old name: Gyrodinium aureolum)Current general conditions: Wk. 29

Potential for problematic species to cause issues : High

Karenia mikimotoi Moderate.

Heterocapsa sp. Moderate

Noctiluca scintillans Low

Coscinodiscus species Moderate increasing.

Phaeocystis sp. Moderate to high.

Chaetoceros sp Moderate to High.

Continued high levels of Phytoplankton cells observed in most

areas. Summer seasonal species dominant in populations .Calm

weather, with high UV indices combined with localised onshore

winds may cause sporadic localised bloom issues. Please note ,

any species at sufficient numbers may cause temporary issues in

water quality which could impact specific areas over the course of

a tidal cycle or for a period of days while specific suitable

conditions prevail. All areas should maintain good routine

sampling if concerned. Karenia sp. cells currently continue to be

observed inshore at low levels only. This species has been known

to come inshore suddenly, at bloom levels, during suitable

environmental conditions.

Phaeocystis speciesKarenia mikimotoiHeterocapsa spp.Noctiluca scintillans

Alexandrium spp.

Any part of coastline

Has tended ,in past ,to be very site specific

Ireland Satellite data: surface chlorophyll and temperature maps

Top 5 phytoplankton cell levels in all areas last week

NW coast (M4) Below average by 1.86°C wk.28SW coast (M3) Below average by 1.45°C wk.28SE coast (M5) Below average by 1.24°C wk.28

Week 29

Temperatures showing a 2 wk trend of belowaverage levels. Chlorophyll levels indicating potentialdecrease again this week in cell levels in general, butsome inner bay areas showing potential temporarypeaks .Caution should be exercised ifweather/environmental conditions allow transportonto exposed shorelines. Dinoflagellates andPrymesiophyte groups increasing . This is now thehistorical season for many bloom species to occur,both beneficial and detrimental. Extra cautionadvised in all areas.

Rank Region Species Rounded Count

1 East Cylindrotheca closterium/ Nitzschia longissima

689000

2 East Chaetoceros (Hyalochaete) spp.

78000

3 East Rhizosolenia spp. 23000

4 East Pseudo-nitzschia seriata complex

7000

5 East Paralia sulcata 1000

1 North-West Chaetoceros (Hyalochaete) spp.

2284000

2 North-West Skeletonema spp. 117000

3 North-West Azadinium/heterocapsa spp. 87000

4 North-West Haptophytes 81000

5 North-West Rhaphidophytes 61000

1 South Lauderia / Detonula sp 23000

2 South Centric diatom 11000

3 South Fragilaria spp. 5000

3 South Odontella spp. 5000

5 South Biddulphia rhombus 2000

1 South-East Chaetoceros (Hyalochaete) spp.

1859000

2 South-East Microflagellate spp. 536000

3 South-East Centric diatom 116000

4 South-East Leptocylindrus danicus 39000

5 South-East Leptocylindrus minimus 25000

1 South-West Lauderia / Detonula sp 164000

2 South-West Leptocylindrus minimus 43000

3 South-West Chaetoceros (Hyalochaete) spp.

40000

4 South-West Chaetoceros debilis 14000

5 South-West Detonula confervacea 13000

1 West Chaetoceros (Hyalochaete) spp.

275000

2 West Rhizosolenia spp. 96000

3 West Pseudo-nitzschia delicatissima complex

91000

4 West Leptocylindrus danicus 33000

5 West Dactyliosolen spp. 28000

1 West North-west Chaetoceros (Hyalochaete) spp.

25000

2 West North-west Pennate diatom 19000

3 West North-west Licmophora spp. 5000

4 West North-west Pseudo-nitzschia seriata complex

5000

5 West North-west Leptocylindrus danicus 4000

1 West South-West Alexandrium spp. 43000

2 West South-West Pennate diatom 2000

3 West South-West Paralia sulcata 2000

4 West South-West Skeletonema spp. 1000

Ireland modelled data: Estimated Water PathwayWeek runs from Sunday to Saturday

Week 23: 31 May – 6 June, 2015Ireland modelled data: Estimated Water Pathway

The maps show the most

likely transport pathways

for the next 3 days of

phytoplankton found along

the presented transects

(black lines off Mizen Head

and the Mouth of Bantry Bay)

and water depths (bottom,

20 metres and surface)

Bottom water Water @ 20 metres Surface water

Reddish colours represent areas

where phytoplankton remain

longest

Cooler colours represent areas

where phytoplankton remain for

shorter periods

Southerly directional water movements in surface waters, with more Northerly movement

dominating deeper waters offshore .

Moderate continued incoming upwelling conditions of outer waters indicated, allowing

offshore waters to enter bay areas through this transportation.

SOUTHWEST: Bantry Bay Forecast for the next 3 days

Ireland modelled data: Estimated Water Pathway

Bantry Bay3 day estimated water flows at the mouth and mid-bay sections of Bantry Bay

T1

T1

T2

Forecast for next 3 days

De

pth

20 m

20 m

Water surface

Sea bed

Flow (m3 s-1)

100

80

60

40

20

0

-20

-40

-60

-80

-100

IN

OUT

Shot Head cross section:

Continued strong upwelling

expected to be main

transportation of outer waters into

inner regions.

Mouth cross section:

Strong dominant

upwelling transport

expected as outer bay

waters move into inner

bay areas.

CURRENT inflowInflow is 47% lower than the long term mean at Shot Head

Inflow is 30% lower than the long term mean at mouth of Bay

Ireland modelled data: Estimated Water PathwayWeek runs from Sunday to Saturday

Week 23: 31 May – 6 June, 2015Ireland modelled data: Estimated Water Pathway

The maps show the most

likely transport pathways

for the next 3 days of

phytoplankton found along

the presented transects i.e.

white lines off Aughrus Point

and the Mouth of Killary

Harbour, and water depths

(bottom, 20 metres and

surface)

Reddish colours represent

areas where phytoplankton

remain longest

Cooler colours represent

areas where phytoplankton

remain for shorter periods

WEST: Killary Harbour Forecast for the next 3 days

Bottom water Water @ 20 metres Surface water

ClegganSoutherly water movements in all depth zones in offshore waters, becoming more dominant

towards surface waters .

KillaryUpwelling moderate transportation, at deeper depths, indicated as far as mid bay areas , allowing

off shore waters to be transported inshore.

Ireland modelled data: Estimated Water Pathway

Killary Harbour - 3 day estimated water flows at the mouth of Killary Harbour

T1

T1

Killary Harbour

De

pth

CURRENT inflow

Inflow is 48% lower than average long term mean at mouth of

Bay

Water

surface

Forecast for next 3 days

Flow (m3 s-1)

100

80

60

40

20

0

-20

-40

-60

-80

-100

IN

OUT

Killary Harbour Mouth cross section:

Moderate deeper water movement of

mixed offshore water expected into

midbay areas .

Ireland modelled data: Estimated Water Pathway

West Coast - 3 day estimated water flows along a transect off Aughrus Point

T1

110 m

Water surface

Forecast for next 3 days

northward

flow

southward

flow

T1

Killary Harbour

Cleggan transect

Aughrus Point

De

pth

Flow (m3 s-1)

100

80

60

40

20

0

-20

-40

-60

-80

-100

northward

flow

southward

flow

T1

Killary Harbour

Cleggan transect

Aughrus PointCleggan section: No change -

Generally strong Southerly

movements dominating most areas

with mid depth developing patches

of Northerly movements growing in

some areas. All waters indicating

good mixing activity and strong

transportation.