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Connecticut Living Shoreline and Its Effect onSpawning Horseshoe CrabsJordan Frederick

Andrew Amuro

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Frederick, Jordan and Amuro, Andrew, "Connecticut Living Shoreline and Its Effect on Spawning Horseshoe Crabs" (2018). AcademicFestival. 132.https://digitalcommons.sacredheart.edu/acadfest/2018/all/132

CONNECTICUT LIVING SHORELINE AND ITS EFFECTS ON SPAWNING HORSESHOE CRABS

Department of Biology, Sacred Heart University, Fairfield, CTJordan Frederick, Andrew Amuro, Jo-Marie Kasinak, & Jennifer H. Mattei

Hypothesis1: There will be an increase in spawning horseshoe crabs after the habitat restoration is completed.

Hypothesis 2: The habitat construction will cause a decline in horseshoe crab spawning.

Null Hypothesis: The habitat restoration will have no effect.

Introduction• Stratford Point (Fig. 1)

• Remington Arms Gun Club (1926-1986)• Lead contamination ~ 12 acres intertidal zone• Horseshoe crab economic importance

Since 2001 the shoreline eroded by 24m• 2014- 49m living shoreline installed (Fig. 2 &

Fig. 4)• 2016- living shoreline expanded to 228m

• We haven taken spawning surveys before and after restoration efforts to observe the effect on horseshoe crab mating from 2011-2017

• Milford Point ( Fig.1) • Part of Stewart B. McKinney Wildlife Refuge

• Rapid decline between the years of 2011-2012.• Milford: 113-65 females/m2

• Stratford : 50-20females/m2

• Both Beaches experienced spawning declines through 2015. Milford declined until 2016 whereas Stratford began to slowly decline until 2015.

• Milford: 65-5 fem/m2

• Stratford: 20-5 fem/m2

• Stratford began to increase in 2015• Milford began to increase in 2016 to 9

fem/m2

• Stratford: 5-21 fem/m2

Figure 1. Location of Stratford Point Living Shoreline and Milford Point ( ).

Figure 2. Observed Spawning Horseshoecrabs

Figure 4. Growth of marsh, September 2017.

Conclusion and Future Directions

• In conclusion, the average number of females began declining before restoration efforts but decreased more during the installation of a living shoreline.

• However, the same decline of spawning females was observed at Milford..• Other environmental factors may be causing this decline such as human disturbance and pollution

events.• The number of females began to increase in 2015-2016 after the restoration was complete.• Our hypothesis was correct as the number of mating females has began to increase post

restoration efforts. • Future efforts include performing more spawning surveys in the summers to get data on mating

females at both the Stratford and Milford sites• Restoration of multiple coastal habitats will continue to improve Stratford Pt and horseshoe crab

spawning habitat by increasing sediment deposition and preventing erosion.

MethodologySpawning Surveys:

• The following spawning survey methods were used at both Stratford Pt. (with the newly restored ‘Living Shoreline’) and at Milford Pt. a conservation area with less disturbed habitat.

• Conducted from mid-May through June. Data collected included the number of females mating and the number of males surrounding her (see Fig. 3)

• The surveys were taken during the high tide at night two days before, during and two days after the Full and New Moons.

• All horseshoe crabs were counted within a measured length of beach within a 3-meter depth. Average number of spawning female horseshoe crabs was calculated per meter squared.

Figure 5. The average number of spawning females per beach.

Results

Figure 3. Spawning Female with one Attached and Two Satellite Males.

ReferencesMattei, JH, M. Botton, M. Beekey, and C. Colón. 2015. Horseshoe Crab Research in Urban Estuaries: Challenges and Opportunities. In Carmichael, R, Botton ML, Cheung SG (eds.) Changing global perspectives on biology, conservation, and management of horseshoe crabs. Springer Pub. New York, NY.Beekey, MA, JH Mattei. 2015. The Mismanagement of Limulus polyphemus in Long Island Sound: What are the Characteristics of a Population in Decline? In Carmichael, R, Botton ML, Cheung SG (eds.) Changing global perspectives on biology, conservation, and management of horseshoe crabs. Springer Pub. New York, NY.Mattei, J. H. Seas of Change: The Restoration of Ecosystem Services in Long Island Sound.Mattei, J. H.; Beekey, M. A.; Rudman, A.; Woronik, A. 2010 Reproductive behavior in horseshoe crabs: Does density matter? 56 (5): 634−642

Figure 6. Replanting of Marsh Grass on Earth Day, April 22.

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Frederick and Amuro: Connecticut Living Shoreline and Its Effect on Spawning Horseshoe

Published by DigitalCommons@SHU, 2018