期刊
FRONTIERS IN MARINE SCIENCE
卷 7, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmars.2020.00029
关键词
Oithona similis; Western Channel Observatory; vertical distribution; population stability; dominant frequency state analysis
资金
- NERC GW4 + Doctoral Training Partnership studentship from Natural Environment Research Council [NE/L002434/1]
- United Kingdom Natural Environment Research Council
- Long-term Single Centre Science Programme, 'Climate Linked Atlantic Sector Science' [NE/R015953/1]
- United Kingdom Research Councils [M2DPP035: EP/P01677411]
- ReCICLE project [NE/M00412011]
- NERC [pml010007, pml010004] Funding Source: UKRI
- Natural Environment Research Council [NE/R015953/1] Funding Source: researchfish
There has been an overall decline in copepod populations across the North Atlantic over the past few decades. Reasons for these declines are unclear, and several major species, including the cyclopoid copepod Oithona similis, have maintained stable populations at station L4 in the western English Channel. To identify the factors contributing to this stability, we conducted a 1-year intensive study of O. similis at L4 over 2017-2018, a period of high climatic variability. For context, dominant frequency state analysis was applied to the 30-year L4 time series to derive the baseline dynamics of the Oithona spp. population. The Oithona spp. baseline demonstrated stable densities and a bimodal annual cycle. These dynamics, as well as those of reproductive output and phaenological timings, were upheld in 2017-2018, indicating resilience to climatic variability. During 2017-2018, all life stages of O. similis were relatively scarce in the top 2 m of the water column, despite the presence of abundant food. Naupliar stages occurred predominantly around 10 m depth, with subsequent life stages progressively deeper. We suggest this vertical structuring may represent different trade-offs between feeding and mortality risk between ontogenetic stages. To determine the traits that contribute to population stability, we compare O. similis with the large, biomass-dominant copepod, Ca/anus helgolandicus. Despite having contrasting functional traits, both species have exhibited strong population stability over the time series. Our results provide evidence that mortality plays a major role in maintaining population dynamics.
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