Miller, K.J., J.M. Bradford-Grieve & J.B. Jillett. (1999). Genetic relationship between winter deep-dwelling and spring surface-dwelling female Neocalanus tonsus in the Southern Ocean. Marine Biology, Berlin 134(1):99-106.

103523

Miller, K.J., J.M. Bradford-Grieve & J.B. Jillett

1999

134(1):99-106.

Publication

Available in Wilson Copepod Library (non-digital)

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This study examines the hypothesis that the winter deep-dwelling and spring surface-dwelling female Neocalanus tonsus in waters o€ the east New Zealand coast are genetically distinct, reproductively isolated species. This is done by comparing sequences of two variable regions of DNA (16S and ITS) from winter and spring N. tonsus collected in 1996, using N. plum?chrus (a northern hemisphere congener) as an outgroup. Analysis of sequence data, indicated clear genetic di€erences between N. tonsus and the outgroup N. plumchrus, with an average of 12% of the 16S sequence and 5.5% of the ITS sequence representing nucleotide substitutions between the two taxa. Low levels of intra-speci®c genetic di€erentiation were recorded (<1% nucleotide di€erences among individ?uals); however there were no sequence di€erences between the N. tonsus females caught in deep water in August (winter) and in shallow water in October (spring). The morphology of these two types of females did not reveal any obvious di€erences. It is therefore likely that the two types do not represent di€erent species but are ecological variants of a single species. The implications of N. tonsus being able to fuel repro?duction in two di€erent ways are discussed.

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