Comparison ofCrassostrea virginicaGmelin (Eastern Oyster) Recruitment on Constructed Reefs and Adjacent Natural Oyster Bars over Decadal Time Scales

Autor:	Roger Mann, Juliana M. Harding, James Wesson, Melissa Southworth
Rok vydání:	2012
Předmět:	geography Oyster geography.geographical_feature_category Taphonomy biology Chesapeake bay biology.organism_classification Natural (archaeology) Fishery Habitat biology.animal Crassostrea Environmental science Eastern oyster Reef Ecology Evolution Behavior and Systematics
Zdroj:	Northeastern Naturalist. 19:627-646
ISSN:	1938-5307 1092-6194
Popis:	Since 1993, oyster reef replenishment efforts in the Virginia portion of the Chesapeake Bay have relied heavily on construction of oyster shell reefs with enhanced vertical relief. We evaluated the performance of six reefs constructed in proximity to natural subtidal oyster bars by comparing recruit densities (spat m-2, where spat are young-of-the-year oysters with shell heights less than 50 mm) between habitats. Recruitment was higher on the reefs than bars during the first 1–3 yr post-construction, usually by at least an order of magnitude. Within 7 yr, recruitment was similar between reef-bar pairs although both reefs and bars received additions of shell, live oysters, or both during the study period. At decadal time scales, constructed oyster reefs did not show enhanced recruitment relative to adjacent natural oyster bars. The rapid decline in reef recruitment post-construction is likely related to three processes: (i) shell degradation by taphonomic processes, (ii) biofouling that occludes t...
Databáze:	OpenAIRE
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