Spatial heterogeneity and genetic variation in the copepod Neocalanus cristatus along two transects in the North Pacific sampled by the Continuous Plankton Recorder |
| |
Authors: | Kirby Richard R; Lindley John A; Batten Sonia D |
| |
Institution: | 1 School of Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
2 Sir Alister Hardy Foundation For Ocean Science, The Laboratory, Citadel Hill, The Hoe, Plymouth PL1 2PB, UK |
| |
Abstract: | We present a macrogeographic study of spatial heterogeneityin an important subarctic Pacific copepod and describe the firstgenetic analysis of population structure using Continuous PlanktonRecorder (CPR) samples. Samples of Neocalanus cristatus werecollected at a constant depth of 7 m from two CPR tow-routes,(i) an eastwest 6500-km transect from Vancouver Island,Canada to Hokkaido Island, Japan, and (ii) a northsouthtransect of 2250 km from Anchorage, Alaska to Tacoma, Washington.Analysis of these samples revealed three features of the biologyof N. cristatus. First, N. cristatus undergoes small-scale dielvertical migration that is larger among stages CVadult(36 times more abundant at 7 m at night), than stagesCICIV (only 24 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 partialsequence of the N. cristatus cytochrome oxidase I gene, revealedthat 7.3% (P < 0.0001) of the total genetic variation amongN. cristatus sampled from macrogeographic patches by the CPRcould be explained by spatial heterogeneity. We suggest thatspatial heterogeneity at macrogeographic scales may be importantin plankton evolution. |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|