Abstract
The spring spawning by the American horseshoe crab (Limulus polyphemus L.) results in temporally and spatially discrete inputs of eggs onto sandy beaches in Delaware Bay, USA. We tested the hypothesis that seasonal patterns of sediment organic carbon on Delaware Bay beaches is linked to this pulsed input of horseshoe crab eggs. At a location with minimal horseshoe crab spawning activity (Higbee Beach), there was little seasonal variation in sediment organic carbon, no distinction between organic carbon levels as a function of shoreline position or sediment depth, and no significant correlation between the abundance of crab eggs and percent organic carbon. Conversely, at a prime horseshoe crab spawning habitat (North Beach), organic carbon levels were seasonally pulsed and were correlated with egg abundance. Moreover, the strongest evidence of seasonality was seen at the middle foreshore location at the 15–20 cm depth, consistent with the highest input of horseshoe crab eggs. Although some of the organic carbon contributed by horseshoe crab eggs in May–June leaves the beach in the form of hatched larvae later in the year, there is a net input of organic carbon to the system in the form of unfertilized and/or dead eggs, egg membranes, and embryonic molts. We suggest that the inputs of eggs from horseshoe crabs and other beach spawning animals, such as grunion and capelin, make significant contributions to the energy budget of sandy beaches.
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Acknowledgments
We thank the staff of the Haskin Shellfish Laboratory (Rutgers University) for the use of the Cape Shore field station, Drs. F. B. Trama and E. W. Stiles for the use of laboratory equipment, and Dr. T. R. Jacobsen for his assistance in sample collection.
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Botton, M.L., Loveland, R.E. Temporal and spatial patterns of organic carbon are linked to egg deposition by beach spawning horseshoe crabs (Limulus polyphemus). Hydrobiologia 658, 77–85 (2011). https://doi.org/10.1007/s10750-010-0451-0
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DOI: https://doi.org/10.1007/s10750-010-0451-0