La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Relationship between Hypoxia and Macrobenthic Production in Chesapeake Bay
Auteurs :	S. Kersey Sturdivant, Auteur ; Robert J. Diaz, Auteur ; Roberto Llanso, Auteur ; Daniel M. Dauer, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (37(5) SEP 2014)
Article en page(s) :	1219-1232
Résumé :	Human development has degraded Chesapeake Bay's health, resulting in an increase in the extent and severity of hypoxia (a parts per thousand currency sign2 mg O-2 l(-1)). The Bay's hypoxic zones have an adverse effect on both community structure and secondary production of macrobenthos. From 1996 to 2004, the effect of hypoxia on macrobenthic production was assessed in Chesapeake Bay and its three main tributaries (Potomac, Rappahannock, and York Rivers). Each year, in the summer (late July -aEuro parts per thousand early September), 25 random samples of the benthic macrofauna were collected from each system, and macrobenthic production in the polyhaline and mesohaline regions was estimated using Edgar's allometric equation. Fluctuations in macrobenthic production were significantly correlated with dissolved oxygen. Macrobenthic production was 90 % lower during hypoxia relative to normoxia. As a result, there was a biomass loss of similar to 7,320-13,200 metric tons C over an area of 7,720 km(2), which is estimated to equate to a 20 % to

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