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Corona, S, Hirst, AG, Atkinson, D, Renz, J, Boersma, M and Atkinson, A 2024 Long‐term shifts in phenology, thermal niche, population size, and their interactions in marine pelagic copepods. Limnology and Oceanography. https://doi.org/10.1002/lno.12499
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Abstract/Summary
Under climatic warming many species shift their seasonal timing of life cycle events (phenology) and sea�sonal abundance distribution, but whether they maintain the same thermal niche is still poorly understood. Here, we studied multidecadal trends in abundance and phenology of seven major copepod species across three stations (Stonehaven (SH), Helgoland Roads (HR), and Plymouth L4) on the North–West European shelf, span�ning � 6.5� of latitude. All seven species consistently occupied colder temperatures at the northern station com�pared to the southerly station, but they maintained the same realized thermal niche over years. Expected phenological shifts (i.e., earlier when warmer) in some stations were obscured possibly by the long-term drop of copepod density in spring–summer, which may be due to a variation in the food/predators abundance. The ongoing spring–summer declines in abundance (� 50%) of many North Atlantic pelagic species over the last five decades, as found in recent studies, may have also influenced the metrics of seasonal timing. To separate the seasonal timing of life events from that of seasonal abundance distribution, we used a time series of egg produc�tion rate (EPR) of Calanus helgolandicus at L4, and found that this shifted later into the summer–autumn over the last 30 yr of warming, coincident with declining spring–summer food and increasing predator abundance. Overall, direct temperature effects do appear to influence the seasonal timing of the copepods, but to explain impacts at individual stations or long-term trends in population size or phenology, understanding the changing balance of food and predators appears to be critical
| Item Type: | Publication - Article |
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| Divisions: | Plymouth Marine Laboratory > National Capability categories > Single Centre NC - CLASS Plymouth Marine Laboratory > National Capability categories > Western Channel Observatory Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity |
| Depositing User: | S Hawkins |
| Date made live: | 29 Feb 2024 11:50 |
| Last Modified: | 29 Feb 2024 11:50 |
| URI: | https://plymsea.ac.uk/id/eprint/10134 |
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