Species-specific abundance of bivalve larvae in relation to biological and physical conditions in a Cape Cod estuary

Marine Ecology Progress Series

Richard H. York¹  Scott M. Gallager¹  Christine M. Thompson¹ 

关键词: Bivalves;    Larval supply;    Transport;    Spawning;    Estuaries;    Shellfish;    Time series;   

DOI  :  10.3354/meps09998

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: Physical and biological conditions impact recruitment and adult population structure of marine invertebrates by affecting early life-history processes from spawning to post-settlement. We investigated how temperature, salinity, and phytoplankton influenced larval abundance and larval size structure for 3 species of bivalves over 2 non-consecutive years in Waquoit Bay, Massachusetts, USA. Abundance and size of Mercenaria mercenaria (quahog), Anomia simplex (jingle clam), and Geukensia demissa (ribbed mussel) larvae were compared between locations in the bay and with environmental conditions. Shell birefringence patterns using polarized light microscopy were used to distinguish species. Larval abundances for all 3 species were higher in 2009 than in 2007 and were positively correlated with temperature in both years. Differences in larval abundance and size structure between bay sites were attributed to salinity tolerances and potential source locations. Higher survival in 2009 than in 2007, as determined by number of pediveligers, was likely due to higher temperatures and greater food availability during the peak abundance months of July and August in 2009. Yearly differences in larval growth and survival can have a large impact on recruitment. Knowing the optimal periods and locations for larval abundance and survival can be useful for isolating species-specific patterns in larval dispersal and to aid resource managers in enhancing or restoring depleted populations. 

【 授权许可】

Unknown