Low mitochondrial diversity and small effective population sizes of the copepods Calanus finmarchicus and Nannocalanus minor: possible impact of climatic variation during recent glaciation

Article Abstract:

Molecular diversity and population sizes of the mitochondrial 16S rRNA gene were investigated in two species of the North Atlantic planktonic copepods, Nannocalanus minor and Calanus finmarchicus. The objective of the study was to determine whether the two species, which differ in patterns of distribution, abundance and life history, would have different patterns of population genetic diversity and structure in response to climatic changes during the last glacial period. Results showed that both copepods have small effective population sizes and low mitochondrial diversity.

Climatic changes, Climate change, Copepoda, Copepods, Glacial climates

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Molecular and population genetic aspects of mitochondrial DNA variability in the diamondback terrapin, Malaclemys terrapin

Article Abstract:

Mitochondrial DNA (mtDNA) from diamondback terrapins was found to average 16.8 kilobases and this produced 73 to 75 restriction fragments. Only six different mtDNA genotypes were identified. Nucleotide sequence divergence estimates were uniformly low, the maximum value being p=0.004. Most of the restriction sites were found to be identical. The most geographically informative fragment was that cleaved by the BstEII enzyme. The low incidence of DNA variation is not reflective of the morphological differences used in the classification of terrapin subspecies.

Diamondback terrapin

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Conservation genetics in the marine realm

Article Abstract:

Marine organisms pose unique challenges and opportunities for molecular genetic research in conservation biology. Geneticists are showing great interest in conservation issues for marine organisms such as dispersal behavior, demography and population structure. The explosion of interest in conservation genetics can be attributed to the development of usable laboratory methods for the direct assay of DNA and proteins, including the mitochondrial DNA assays for characterizing matrilineages within and among species and direct nucleotide sequencing techniques.

Marine biology

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