TNC’s shellfish restoration
efforts on Long Island NY:
Achievements, lessons
learned, and next steps
Baird Symposium: The
...
Ultimate objective
Restore LI estuaries to thriving, healthy, naturally
productive, self-sustaining ecosystems that benefi...
Key estuarine/coastal biogenic
habitats
Why Shellfish?
No clam
s

2 clam
s

4 clam
s

8 clam
s

Great South Bay NY, circa 1976

16 clam
s
Four main challenges to bay-wide clam recovery
Water quality / clam food quality

Predation

Yum
Clams!

Recruitment limit...
Fishing and predation mortality
“Whether the clams were abundant or
scarce, commercial clammers on the Great
South Bay hav...
Increasing production of
wild-born clams
Clam seed abundance and
distribution
Clam seed
abundance and
distribution
2008 Brown Tide hits hard
GSB BT cell counts 2004-2012
Clam seed abundance and
distribution
9

10

C ondition Inde x
Y-M e a n
G onadaR ank
Y-M e n

6
3

8
2

7

1

0

G onad R ank

5
Jan04
A pr04
Jul04
O ct04
Jan0...
Conditions in GSB in 2011
Toxic algae bloom dashed hopes for
2012 scallop season
“Scallops Suffer Massive Die-Off:
Red Tide May Be To Blame” EHS 10/...
Sources of reactive nitrogen to
coastal waters
County land
use data
N-Load and
ELM models
quantify
sources of
Nitrogen
loa...
33 GSB sub-watersheds
˜ 1M people live in the GSB
groundwatershed

SWSD has ocean outfall

20% GW to Ocean
N loads to GSB from watershed
(684,000 kg N / yr)
Fire Island
2%

golf courses
lawns
2%
7%
agriculture
1%

atm to land
20%...
Total N Loads to Great South Bay
(908,000 kg N/Yr)
lawns
5%
agriculture
0%

golf 
Fire Island
courses
2%
1%
atm to land
15...
Linking development to groundwater N,
case study, Bicycle Path (Suffolk County 2011)
Other impacts of excessive algal
growth from nitrogen pollution
LIS hypoxia
Algae symptoms are island-wide
Nitrogen enrichment impacts on
seagrass from Butler (1999)
Eelgrass is Essential Fish Habitat

Thousands of acres of eelgr...
Nitrogen pollution impacts
on saltmarshes
Images from Nature 10/2012

CAT scans of marsh roots:
Failing
Stable
Healthy mar...
Population gains still possible

Clam Seed Abundance and Distribution
New Sandy caused
Inlet in eastern GSB
Increased water
clarity
Lower dissolved
nutrients
Increased
circulation with
ocean w...
Positive response
to new inlet /
impacts not
estuary wide
Unusually good growth near new
inlet (Bellport Bay July 2013)
Defining “RESTORATION”
Future of shellfish in RI?
• Articulate goals (fishery vs production
vs ecosystem)
• Address all major threats
• Think ahe...
Questions?
Development of the 2013 GSB
brown tide
Upcoming SlideShare
Loading in …5
×

Carl LoBue, "TNC’s shellfish restoration efforts on Long Island NY: Achievements, lessons learned, and next steps," Baird Symposium

1,643 views

Published on

Carl LoBue, Senior Marine Scientist, The Nature Conservancy

Topic: The Value of Restoring Shellfish

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,643
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
7
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Carl LoBue, "TNC’s shellfish restoration efforts on Long Island NY: Achievements, lessons learned, and next steps," Baird Symposium

  1. 1. TNC’s shellfish restoration efforts on Long Island NY: Achievements, lessons learned, and next steps Baird Symposium: The Future of Shellfish in RI Nov 14, 2013 Carl LoBue, clobue@tnc.org
  2. 2. Ultimate objective Restore LI estuaries to thriving, healthy, naturally productive, self-sustaining ecosystems that benefit people and nature
  3. 3. Key estuarine/coastal biogenic habitats
  4. 4. Why Shellfish? No clam s 2 clam s 4 clam s 8 clam s Great South Bay NY, circa 1976 16 clam s
  5. 5. Four main challenges to bay-wide clam recovery Water quality / clam food quality Predation Yum Clams! Recruitment limitation Effective, coordinated harvest management and enforcement
  6. 6. Fishing and predation mortality “Whether the clams were abundant or scarce, commercial clammers on the Great South Bay have always been free to take as many as they want.” Newsday 12/22/2009
  7. 7. Increasing production of wild-born clams
  8. 8. Clam seed abundance and distribution Clam seed abundance and distribution
  9. 9. 2008 Brown Tide hits hard
  10. 10. GSB BT cell counts 2004-2012
  11. 11. Clam seed abundance and distribution
  12. 12. 9 10 C ondition Inde x Y-M e a n G onadaR ank Y-M e n 6 3 8 2 7 1 0 G onad R ank 5 Jan04 A pr04 Jul04 O ct04 Jan05 A pr05 Jul05 O ct05 Jan06 A pr06 Jul06 O ct06 Jan07 A pr07 Jul07 O ct07 Jan08 A pr08 Jul08 O ct08 Jan09 A pr09 Jul09 O ct09 Jan10 A pr10 Jul10 O ct10 Jan11 C ondi tion Index Clam condition and spawning 2004-2010 4 G SB - T ran splan t Site A
  13. 13. Conditions in GSB in 2011
  14. 14. Toxic algae bloom dashed hopes for 2012 scallop season “Scallops Suffer Massive Die-Off: Red Tide May Be To Blame” EHS 10/23/12 Just a few weeks ago, baymen and shellfish experts were brimming with optimism about what was expected to be a banner bay scallop harvest when the season opens next month. Some pointed to the predictions as a sign that the local scallop population had finally gotten past the devastation wreaked by brown tides in the 1980s and 1990s. This week, much of that optimism has evaporated. Scientists from Long Island University.., said they found as much as 90 percent mortality rates in the mammoth “set” of bay scallops that they recorded at the start of the summer
  15. 15. Sources of reactive nitrogen to coastal waters County land use data N-Load and ELM models quantify sources of Nitrogen loaded to LI bays 2008 Kinney and Valiela + 2010 USGS
  16. 16. 33 GSB sub-watersheds
  17. 17. ˜ 1M people live in the GSB groundwatershed SWSD has ocean outfall 20% GW to Ocean
  18. 18. N loads to GSB from watershed (684,000 kg N / yr) Fire Island 2% golf courses lawns 2% 7% agriculture 1% atm to land 20% septic/  cesspool 67% atm to  STPs water 1% 0%
  19. 19. Total N Loads to Great South Bay (908,000 kg N/Yr) lawns 5% agriculture 0% golf  Fire Island courses 2% 1% atm to land 15% atm to  water 25% septic/  cesspool 51% STPs 1%
  20. 20. Linking development to groundwater N, case study, Bicycle Path (Suffolk County 2011)
  21. 21. Other impacts of excessive algal growth from nitrogen pollution LIS hypoxia
  22. 22. Algae symptoms are island-wide
  23. 23. Nitrogen enrichment impacts on seagrass from Butler (1999) Eelgrass is Essential Fish Habitat Thousands of acres of eelgrass have already disappeared
  24. 24. Nitrogen pollution impacts on saltmarshes Images from Nature 10/2012 CAT scans of marsh roots: Failing Stable Healthy marsh Impacted marsh
  25. 25. Population gains still possible Clam Seed Abundance and Distribution
  26. 26. New Sandy caused Inlet in eastern GSB Increased water clarity Lower dissolved nutrients Increased circulation with ocean water Transit of marine animals (fish and seals)
  27. 27. Positive response to new inlet / impacts not estuary wide
  28. 28. Unusually good growth near new inlet (Bellport Bay July 2013)
  29. 29. Defining “RESTORATION”
  30. 30. Future of shellfish in RI? • Articulate goals (fishery vs production vs ecosystem) • Address all major threats • Think ahead • Monitor / adapt • LI vs VCR • Commitment / Scale
  31. 31. Questions?
  32. 32. Development of the 2013 GSB brown tide

×