Spatial Heterogeneity and Genetic Variation in the Copepod Neocalanus Cristatus Along Two Transects in the North Pacific Sampled By the Continuous Plankton Recorder

Kirby, RR, Lindley, JA and Batten, SD 2007 Spatial Heterogeneity and Genetic Variation in the Copepod Neocalanus Cristatus Along Two Transects in the North Pacific Sampled By the Continuous Plankton Recorder. Journal of Plankton Research, 29 (1). 97-106.

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Abstract/Summary

We present a macrogeographic study of spatial heterogeneity in an important subarctic Pacific copepod and describe the first genetic analysis of population structure using Continuous Plankton Recorder (CPR) samples. Samples of Neocalanus cristatus were collected at a constant depth of similar to 7 m from two CPR tow-routes, (i) an east-west similar to 6500-km transect from Vancouver Island, Canada to Hokkaido Island, Japan, and (ii) a north-south transect of similar to 2250 km from Anchorage, Alaska to Tacoma, Washington. Analysis of these samples revealed three features of the biology of N. cristatus. First, N. cristatus undergoes small-scale diel vertical migration that is larger among stages CV- adult (3-6 times more abundant at 7 m at night), than stages CI-CIV (only 2-4 times higher at night). Secondly, while there were no regions where N. cristatus did not appear, each transect sampled a few large-scale macrogeographic patches. Thirdly, an analysis of molecular variation, using a partial sequence of the N. cristatus cytochrome oxidase I gene, revealed that 7.3% (P < 0.0001) of the total genetic variation among N. cristatus sampled from macrogeographic patches by the CPR could be explained by spatial heterogeneity. We suggest that spatial heterogeneity at macrogeographic scales may be important in plankton evolution.

Item Type:	Publication - Article
Additional Information. Not used in RCUK Gateway to Research.:	J. Plankton Res.
Additional Keywords:	Cytochrome oxidase I; Cytochromes; Developmental stages; Evolution; Genetic analysis; Genetic diversity; Islands; Marine crustaceans; Nucleotide sequence; Plankton; Plankton surveys; Population genetics; Population structure; Spatial heterogeneity; Vertical migrations; Zooplankton; Article Taxonomic Terms: Copepoda; Neocalanus cristatus; Article Geographic Terms: INE, Canada, British Columbia, Vancouver I.; INE, USA, Alaska; INE, USA, Washington; INW, Japan, Hokkaido, Copepods, Marine Staff ASFA
Depositing User:	Miss Gemma Brice
Date made live:	26 Mar 2014 14:09
Last Modified:	06 Mar 2017 17:57
URI:	https://plymsea.ac.uk/id/eprint/5801

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