Secondary production within a seagrass bed (Zostera marina andRuppia maritima) in lower Chesapeake Bay
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Monthly sampling of a 140-ha seagrass bed in the lower Chesapeake Bay, Virginia, revealed that 13 numerically and trophically important species, representing about 20% of the total community densities over the year-long study period, accounted for the production of ≈42 g dry wt m−2 yr−1. This estimate is likely conservative due to our assumptions on voltinism and fixed size at maturity regardless of season for the species studied. The isopodErichsonella attenuata accounted for 17.6 g dry wt m−2 yr−1 or 42% of the calculated total production, while the portunid decapodCallinectes sapidus and the amphipodGammarus mucronatus each accounted for 7.7 g dry wt m−2 yr−1. The 10 remaining species (4 peracarids, 4 molluscs, and 2 decapods) each produced less than 2 g dry wt m−2 yr−1. Total seagrass-associated secondary production was estimated to equal or exceed 200 g dry wt m−2yr−1. By applying this estimate to the entire 140-ha grassbed, we projected that, on average, 4.8 metric tons dry wt of invertebrate standing stock and 55.9 metric tons of invertebrate production occur over the year.
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- Secondary production within a seagrass bed (Zostera marina andRuppia maritima) in lower Chesapeake Bay
Volume 13, Issue 4 , pp 431-440
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- 1. Dredged Material Management Section New England Division, COE, 424 Trapelo Road, 02254-9149, Waltham, Massachusetts
- 2. Virginia Institute of Marine Scinece School of Marine Science, College of Villiam and Mary, 23062, Gloucester Point, Virginia