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Seasonality of bivalve larvae within a high Arctic fjord
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Seasonality of bivalve larvae within a high Arctic fjord
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Journal Article
Seasonality of bivalve larvae within a high Arctic fjord
2017
Overview
The temporal and spatial distribution of larval plankton of high latitudes is poorly understood. The objective of this work is to identify the occurrence and abundance of pelagic bivalve larvae within a high Arctic fjord (Adventfjorden, Svalbard) and to reveal their seasonal dynamics in relation to environmental variables—temperature, salinity and chlorophyll
a
—between December 2011 and January 2013. We applied a combination of DNA barcoding of mitochondrial 16S ribosomal RNA and morphological analysis to identify the bivalve larvae found within the plankton and demonstrate a strong seasonality in the occurrence of bivalve larvae, largely coinciding with periods of primary productivity. Seasonal occurrences of bivalve larval species differ from those known for other populations across species’ biogeographic distribution ranges.
Serripes groenlandicus
, which is of circum-Arctic distribution, demonstrated a later occurrence than
Mya truncata
or
Hiatella arctica
, which are of predominantly boreal or cosmopolitan distribution, respectively.
S. groenlandicus
larvae demonstrate the most pronounced response to seasonality, with the shortest presence in the water column. Establishing latitudinal differences in the occurrence of bivalve larvae enhances our understanding of how reproductive traits of marine invertebrates may respond to climate-driven seasonal shifts in the occurrence of primary productivity.
