New Zealand Journal of Marine and Freshwater Research abstracts
Population-genetic structure in the New Zealand caddisfly Orthopsyche fimbriata revealed
with mitochondrial DNA
Peter J. Smith
S. Margaret McVeagh
National Institute of Water and Atmospheric Research Limited
Private Bag 14 901
Wellington, New Zealand
email: p.smith@niwa.co.nz
Kevin J. Collier
Environment Waikato
P.O. Box 4010
Hamilton, New Zealand
Abstract Nucleotide sequences of 422 base pairs of the cytochrome c oxidase
subunit I (COI) gene were used to assess phylogeographic structure in the New
Zealand hydropsychid caddisfly Orthopsyche fimbriata. A hierarchical
examination of populations from 16 streams at different spatial scales in the
central and northern North Island of New Zealand found 23 haplotypes. Most
regions were characterised by unique haplotypes with genetically differentiated
populations at the 70+ km scale. Haplotype diversity was high (0.5–0.8) at most sites, but low (0.2–0.3)
in Northland and zero at some central sites. Analyses of molecular variance found
significant genetic diversity among regions (66%) and among catchments (55%).
Most population pair-wise FST tests were significant, with non-significant
pair-wise tests among sites in the central region and pairs of sites between
neighbouring streams. The levels of sequence divergence are interpreted as
the result of divergence of relict populations in multiple refugia, leading
to the evolution of regionally unique haplotypes. The low diversity in some
central region populations is interpreted as resulting from re-colonisation
following extinctions associated with historical volcanic events.
Keywords Orthopsychefimbriata; mitochondrial
DNA; cytochrome c oxidase I (COI); gene flow
New Zealand Journal of Marine and Freshwater Research, 2006, Vol. 40:
141–148
0028–8330/06/4001–0141 © The Royal Society
of New Zealand 2006
M05040; Online publication date 9 February 2006Received 28 June 2005;
accepted 7 October 2005
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