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Effects of warm water intrusions on populations of macrozooplankton on Georges Bank, Northwest Atlantic
Brown, H.; Bollens, S.M.; Madin, L.P.; Horgan, E.F. (2005). Effects of warm water intrusions on populations of macrozooplankton on Georges Bank, Northwest Atlantic. Cont. Shelf Res. 25(1): 143-156. https://dx.doi.org/10.1016/j.csr.2004.07.028
In: Continental Shelf Research. Pergamon Press: Oxford; New York. ISSN 0278-4343; e-ISSN 1873-6955, meer
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| Trefwoord |
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| Author keywords |
Macrozooplankton; Distribution; Abundance; Warm water intrusions; Slope water; Northwest Atlantic; Georges Bank |
| Auteurs | | Top |
- Brown, H.
- Bollens, S.M.
- Madin, L.P.
- Horgan, E.F.
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| Abstract |
As part of the Georges Bank/North West Atlantic GLOBEC (Global Ocean Ecosystems Dynamics) Program, macrozooplankton and micronekton were collected on 30 Broad Scale Survey Cruises between January–June, 1995–1999, using a 10 m2 MOCNESS (3 mm mesh). The objective of this study is to examine the effects of warm water intrusions on populations of macrozooplankton, namely Salpa spp., Phronima spp., Neomysis americana, and Crangon septemspinosa, on Georges Bank. Salpa spp. and Phronima spp. showed a large degree of horizontal co-occurrence, being found predominantly in Upper Slope/Gulf Stream Water and Georges Bank/Gulf of Maine Water. Abundances of these taxa showed striking interannual variability, and were only abundant on the southern flank and in the Northeast Channel in late spring/early summer of 1995 and 1999, periods during which AVHRR imagery and hydrographic data showed the presence of warm water intrusions. These intrusions seemed to have little effect on the distribution of other macrozooplankton (e.g., N. americana and C. septemspinosa). Warm water intrusions can directly affect Salpa spp. and Phronima spp. populations by advecting them onto Georges Bank, although other, more resident populations, especially those inside the 100 m isobath, seem to be little affected by such intrusions. |
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