Molecular diversity of the copepod, <I>Nannocalanus minor</I>: Genetic evidence of species and population structure in the North Atlantic Ocean

Clicks: 1
ID: 296707
1996
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal

Ranked #915 of 1,397 articles by views in journal of marine research

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 1,397 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
The abundant calanoid copepod, Nannocalanus minor, is widespread from the Florida Straits (FS), throughout the Gulf Stream and the Sargasso Sea, to the eastern North Atlantic Ocean. Does the species represent a single, randomly-mating population across this extensive region, or does it comprise a number of genetically distinct populations or taxonomically distinct forms? What are patterns and pathways of dispersal of the copepod across the North Atlantic? These questions were addressed using population genetic analysis of DNA sequence variation of a 440 base-pair region of the mitochondrial 16S rRNA gene. This analysis separated N. minor into two genetically distinct types (distinguished by 10% sequence difference) that may represent the previously described N. m. forma major and N.m. forma minor. The two genetic types differed in size range and in geographic distribution: Type I individuals were larger and were most abundant in the western regions of the Gulf Stream; Type II individuals were smaller and became more abundant toward the eastern regions of the Gulf Stream. Significant differences in the size-frequency distributions of N. minor from different regions of the North Atlantic may result from mixtures of the two genetic types and environmental differences in food availability. Within N. minor Type I, mtDNA sequence variation defined 68 haplotypes among 155 individuals. The haplotype frequency distribution was skewed: there were 40 individuals of one haplotype, 31 individuals of a second, and 60 unique individuals. Haplotype diversity, h, was very similar across the sampled range: h = 0.886 in samples from the FS and 0.874 for samples from the Gulf Stream Meander Region (GSMR). Nucleotide diversity, p i , was significantly greater in the FS (p i = 0.00490) than in the GSMR (0.00414), largely due to a number of genetically divergent individuals. Haplotype abundances did not differ significantly either within the regions (among FS samples, P = 0.756; among GSMR samples, P = 0.336) or between the regions (P = 0.636). Molecular genetic analysis can reveal cryptic species among marine taxa, and is particularly useful for taxa characterized by morphological similarity.
Reference Key
openalex_W2012800088 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ann Bucklin, Todd C. LaJeunesse, Eva Curry, John P. Wallinga, Karen Garrison
Journal journal of marine research
Year 1996
DOI
10.1357/0022240963213385
URL
https://doi.org/10.1357/0022240963213385
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.