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. High all areas.

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

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

AZP: 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. Continue cell presence but beginning to clear slowly. Highest SW and W, now experiencing closures as indicated, and increasing to high throughout all coastline. Increase in preparedness and continuance of good sampling recommended through out this seasonal transitional period.

PSP: No Change- 2 week trend. Highest SW region, see specific sites. Current weather may lead to breakup or spread –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 : ( Caution increasing – please see additional information section for news).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 5 0

Week 28: July 5th – 11th 2020

Based on current site testing

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. 28 – -Highest caution-Continued high Dinophysis celllevels and potential increasingspread causing seasonalclosures –particularly in SW butalso West. Areas adjacent toclosed areas should exercisehigh caution also. This is thehistorical 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. 28 - Negligible toxinlevels currently . No cleartrend established. Westernshorelines showing 1 weekpossible increase,particularly off Galway/Mayo areas.

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. 28: - Precautionarymoderate watch level cautionin all affected areas due toincreases in spread 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. 28 –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. 28

Potential for problematic species to cause issues : High

Karenia mikimotoi Moderate to High, increasing.

Heterocapsa sp. Moderate to High, increasing.

Noctiluca scintillans Low

Coscinodiscus species Moderate.

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 1.50°C wk.27SW coast (M3) Below average by 1.16°C wk.27SE coast (M5) Below average by 1.11°C wk.27

Week 28

Chlorophyll levels indicating potential decrease thisweek in cell levels in general, but some inner bayareas showing potential temporary peaks .Cautionshould be exercised if weather/environmentalconditions allow transport onto exposed shorelines.Dinoflagellates and Prymesiophyte groups increasing. This is now the historical season for many bloomspecies to occur, both beneficial and detrimental.Extra caution advised in all areas.

Rank Region Species Rounded Count

1 East Chaetoceros (Hyalochaete) spp.

2183000

2 East Pseudo-nitzschia seriata complex

60000

3 East Rhizosolenia spp. 11000

4 East Lauderia / Detonula sp 5000

5 East Skeletonema spp. 5000

1 North-West Microflagellate spp. 12488000

2 North-West Chaetoceros (Hyalochaete) spp.

2827000

3 North-West Pennate diatom 180000

4 North-West Leptocylindrus danicus 59000

5 North-West Prorocentrum micans 40000

1 South Prorocentrum balticum/minimum

706000

2 South Lauderia / Detonula sp 25000

3 South Leptocylindrus minimus 21000

4 South Chaetoceros (Hyalochaete) spp.

20000

5 South Skeletonema spp. 17000

1 South-East Chaetoceros (Hyalochaete) spp.

618000

2 South-East Skeletonema spp. 368000

3 South-East Centric diatom 70000

4 South-East Leptocylindrus danicus 68000

5 South-East Pennate diatom 30000

1 South-West Prymnesiophytes 119000

2 South-West Microflagellate spp. 93000

3 South-West Prorocentrum micans 75000

4 South-West Leptocylindrus minimus 75000

5 South-West Skeletonema costatum 73000

1 West Chaetoceros (Hyalochaete) spp.

1718000

2 West Skeletonema spp. 213000

3 West Pseudo-nitzschia seriata complex

115000

4 West Chaetoceros socialis 86000

5 West Rhizosolenia spp. 42000

1 West North-west Microflagellate spp. 5065000

2 West North-west Euglena/Eutreptiella spp. 844000

3 West North-west Glenodinium spp. 170000

4 West North-west Pennate diatom 118000

5 West North-west Leptocylindrus minimus 78000

1 West South-West Leptocylindrus minimus 10000

2 West South-West Paralia sulcata 2000

3 West South-West Guinardia delicatula 2000

4 West South-West Prorocentrum micans 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

Continued dominant Southerly directional water movements in all depths, with more active

movement compared to recent weeks.

no change- 2 week pattern - Continued strong 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 equal to the long term mean at Shot Head

Inflow is 2% greater 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

ClegganMixed water movements in all depth zones in offshore waters .This may allow current water

conditions to remain stable for a period of time.

KillaryContinued strong transportation, at all 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 22% 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 mixed water movement

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 Point Cleggan section: 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.