Publication Date:
2022-05-25
Description:
Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here for personal use, not for redistribution. The definitive version was published in Continental Shelf Research 111 (2015): 83-94, doi:10.1016/j.csr.2015.11.001.
Description:
The cryptic copepod species, Pseudocalanus moultoni and P. newmani, co-occur on Georges
Bank and in the Gulf of Maine (Northwest Atlantic); even recent studies have reported results
and conclusions based on examination of the combined species. Species-specific PCR (SS-PCR)
based on mitochondrial cytochrome oxidase I (COI) sequence divergence was used in this study
to discriminate the species. Species-specific descriptions of habitat usage and predicted patterns
of transport and retention on Georges Bank were made by mapping distributions and calculating
abundances of each species from January to June, 1999 for four vertical strata (0-15 m, 15-40 m,
40-100 m, and 0-100 m) and five regions (Northern Flank, Bank Crest, Northeast Peak, Southern
Flank, and Slope Water) identified on the basis of bathymetry and circulation. Patterns of
distribution and abundance for the two species during January to June, 1999 were largely
consistent with those described based on vertically integrating mapping and analysis for the same
period in 1997 by McGillicuddy and Bucklin (2002). The region-specific and depth-stratified
analyses allowed further discrimination in habitat usage by the species and confirmed the
distinctive patterns for the two species. The observed differences between the species in
abundances among the five regions and three depth strata over Georges Bank impact their
transport trajectories. The concentration of P. moultoni in deep layers likely explains the higher
rates of retention and lower rates of advective loss of this species from the Bank, compared to P.
newmani, which may be more subject to wind-driven transport in the surface layer. Accurate
identification and discrimination of even closely-related and cryptic species is needed to ensure
full understanding and realistic predictions of changes in diversity of zooplankton and the
functioning of pelagic ecosystems.
Description:
Funding was provided by the National Science Foundation as part of the
U.S. GLOBEC Program (Award Nos. OCE-9529100 and OCE-9632840 to Ann Bucklin; Award
No. OCE-0815047 to Dennis McGillicuddy).
Keywords:
Zooplankton
;
Georges Bank
;
Cryptic species
;
COI
;
Pseudocalanus
Repository Name:
Woods Hole Open Access Server
Type:
Preprint
Format:
application/pdf
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