Environmental drivers of vertical distribution in diapausing Calanus copepods in the Northwest Atlantic
| Autor: | Kira A. Krumhansl, Pierre Pepin, Catherine Johnson, Nicholas R. Record, Jeffrey A. Runge, Erica J. H. Head, Stéphane Plourde |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences biology Range (biology) Continental shelf 010604 marine biology & hydrobiology Calanus finmarchicus Geology Aquatic Science Diapause biology.organism_classification 01 natural sciences Oceanography Calanus Environmental science Ecosystem Right whale 0105 earth and related environmental sciences Trophic level |
| Zdroj: | Progress in Oceanography. 162:202-222 |
| ISSN: | 0079-6611 |
| Popis: | Copepods of the genus Calanus play a critical trophic role in the North Atlantic ecosystems, where they serve as an important source of energy-rich food for fish and marine mammals, including the endangered North Atlantic right whale. As a strategy for coping with unfavorable near-surface conditions, Calanus enter diapause and migrate to deep water in late summer and fall after feeding and accumulating lipid stores in spring and summer. In order to assess the most important physical drivers of vertical distribution of diapausing Calanus, we synthesized existing depth-stratified abundance data of Calanus finmarchicus and Calanus hyperboreus from the Northwest Atlantic continental shelf and slope regions, spanning Newfoundland in the northeast to the Gulf of Maine in the southwest. Bottom depth strongly constrained the depth and shape of vertical distributions, with distributions becoming deeper and less compact as bottom depth increased. Diapausing Calanus, observed across a broad range of temperature (T) and in-situ density (σ) conditions (T = −1.0 to 14.4 °C, σ = 25.3–28.1 kg m−3), tended to distribute at depths with the coldest temperatures locally available. Over the shelf, diapausing Calanus in the GOM and SS generally did not have access to temperatures considered optimal for diapause ( |
| Databáze: | OpenAIRE |
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