CALLINECTES SAPIDUS AND UCA SPP. MEGALOPAE INCREASE DUE TO WIND EVENTS ALONG EACH SIDE OF

DELAWARE BAY

By Patrick ReynoldsMarine Academy of Science and Technology

Introduction

Background

• Final stage

• 1 mm width

• 21-49 days

Types of Megalopae Studied

Uca spp.

Callinectes sapidus

Original Locations

Moby’s Dock at Atlantic Highlands, NJ Navesink River Rd., Monmouth Beach, NJ

New Location

• Delaware Bay

New Locations Continued…New Jersey Side:Cape May, NJ

Coast Guard Base

Delaware Side:Lewes, DE

Broadkill River

Effects of Wind

•DE Buoy 44009

Hypothesis

H-Wind events will result in significant increases in the Callinectes sapidus and Uca spp. megalopae population caught along the New Jersey and Delaware coasts of the Delaware Bay.

Null and Alternate

H0-Wind events will have no effect on the Callinectes sapidus and Uca spp. megalopae population caught along the New Jersey and Delaware coasts of the Delaware Bay.

HA-Wind events will result in significant decreases in the Callinectes sapidus and Uca spp. megalopae population caught along the New Jersey and Delaware coasts of the Delaware Bay.

Method

Equipment• Life Jackets

• Megalopae Catching Device(MCD)

• Filter

• Container

• Squirt Bottle

• Sieve

• Buckets

MCDsFILTERPVC PIPE

Deployment

Retrieval

Soak Filters

Pour through Sieve

Fill Up Squirt Bottle and Container

Remove Megalopae from Sieve

• UCA spp. caught more frequently

• Maximum megalopae caught– Delaware side

– Uca spp.

– 102.25

Results

GRAPH 1 CALLINECTES SAPIDUS MEGALOPAE

PERCENT OF MAXIMUM CATCH FOR DE AND NJ IN 1996

GRAPH 2UCA spp. MEGALOPAE PERCENT OF

MAXIMUM CATCH FOR DE AND NJ IN 1996

GRAPH 3CALLINECTES SAPIDUS MEGALOPAE

PERCENT OF MAXIMUM CATCH FOR DE AND NJ IN 1997

GRAPH 4UCA spp. MEGALOPAE PERCENT OF

MAXIMUM CATCH FOR DE AND NJ IN 1997

GRAPH 5CALLINECTES SAPIDUS MEGALOPAE

PERCENT OF MAXIMUM CATCH FOR DE AND NJ IN 1998

GRAPH 6UCA spp. MEGALOPAE PERCENT OF MAXIMUM CATCH FOR DE AND NJ

IN 1998

96 97 98RANGE 0-61.75 0-102.25 0-60

DELAWARE MEAN 8.36 11.42 3.95DEVIATION 12.81 17.74 7.38

DATE 12-Aug 14-Jul 13-Jul

RANGE 0-91.25 0-51.75 0-70.38NEW JERSEY MEAN 10.53 6.36 6.76

DEVIATION 20.12 10.13 12.71DATE 12-Aug 14-Jul 13-Jul

TABLE 1CATCH DATA FOR UCA SPP. MEGALOPAE FROM 1996-1998 OF DELAWARE AND NEW JERSEY

TABLE 2CATCH DATA FOR CALLINECTES SAPIDUS MEGALOPAE FROM 1996-1998 OF DELAWARE AND NEW JERSEY

96 97 98RANGE 0-8.75 0-28.75 0-9.75

DELAWARE MEAN 0.77 1.37 0.91DEVIATION 1.41 3.39 1.42DATE 12-Aug 14-Jul 13-Jul

RANGE 0-.25 0-21.7 0-.375NEW JERSEY MEAN 0.009 0.48 0.009

DEVIATION 0.04 2.94 0.053DATE 12-Aug 14-Jul 13-Jul

G-Test

• Statistical Analysis

• P-value 0.05– Degree of freedom = 3

– Greater than 7.815 would prove difference

P-Value= 0.05 Degree of Freedom

3.841 1

5.991 2

7.815 3

G-Test Continued…YEAR SITE/TYPE O*Ln(O/E) (P-Value)

1996 NJ/CAL 3.8955

1996 NJ/UCA 12.281

1996 DE/CAL 3.9063

1996 DE/UCA 3.2246

1997 NJ/CAL 2.9461

1997 NJ/UCA 1.0676

1997 DE/CAL 1.2168

1997 DE/UCA .59076

1998 NJ/CAL 5.4628

1998 NJ/UCA 5.1255

1998 DE/CAL 6.6556

1998 DE/UCA 6.4813

Conclusion

Errors

• Method

• Location

• Human Error

Acknowledgements

• Dr. Peter M. Rowe (Mentor)

• Dr. Cecilia Natunewicz (Delaware Bay Data)

• Mrs. Barbara Boyd (Instructor)

• Ms. Liza Baskin (Instructor)

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