Seasonal variation of zooplankton community structure and trophic position in the Celtic Sea: A stable isotope and biovolume spectrum approach
Seasonal variation of zooplankton community structure and trophic position in the Celtic Sea: A stable isotope and biovolume spectrum approach
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DOI：
10.1016/j.pocean.2018.03.012
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发表时间：
2019-10
影响因子：
4.1
通讯作者：
S. Giering;Seòna R Wells;K. Mayers;Hanna S. Schuster;L. Cornwell;Elaine S. Fileman;A. Atkinson;K. Cook;C. Preece;D. Mayor
中科院分区：
文献类型：
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作者：
S. Giering;Seòna R Wells;K. Mayers;Hanna S. Schuster;L. Cornwell;Elaine S. Fileman;A. Atkinson;K. Cook;C. Preece;D. Mayor
大陆架上的浮游动物是浮游植物向更广泛的生态系统转移能量和物质的重要媒介。它们的分类组成和与浮游植物的营养相互作用在空间和时间上都是不同的，解释这种不断变化的景观的含义仍然是一个重大挑战。在这里，我们将浮游生物分类数据与生物体积光谱和稳定同位素分析相结合，以提供对大陆架海洋生态系统（凯尔特海）在春夏秋过渡期间发生的营养相互作用的见解。生物体积光谱较好地反映了浮游动物群落在总生物量和营养定位方面的季节性发展，并与稳定同位素分析估计的营养定位相匹配。4月初，大型微型浮游生物（63-200 µm）的营养地位高于中浮游动物（>200 µm），这可能反映了中浮游动物捕食者不易获得的纳米浮游生物（2-20 µm）的优势。在春季开花期间，由于初级产量的提高，使得掠食性物种的丰度更高，生物量和营养水平的数量增加。7月浮游生物群落营养地位较高，与微生物循环和有机质循环有重要联系。生物量和群落营养水平之间的强相关性表明，凯尔特海是一个相对封闭的、以能量有限为主的生态系统。陆架中部浮游动物生物量和群落结构的变化过程与陆架断裂处不同，可能反映了陆架断裂时大型浮游动物和远洋鱼类对桡足类的捕食控制增加。我们认为，尺寸光谱和稳定同位素技术的结合在解释浮游生物营养相互作用的季节进展方面具有很强的互补性和实用性。
Zooplankton on continental shelves represent an important intermediary in the transfer of energy and matter from phytoplankton to the wider ecosystem. Their taxonomic composition and trophic interactions with phytoplankton vary in space and time, and interpreting the implications of this constantly evolving landscape remains a major challenge. Here we combine plankton taxonomic data with the analysis of biovolume spectra and stable isotopes to provide insights into the trophic interactions that occur in a shelf sea ecosystem (Celtic Sea) across the spring-summer-autumn transition. Biovolume spectra captured the seasonal development of the zooplankton community well, both in terms of total biomass and trophic positioning, and matched trophic positions estimated by stable isotope analysis. In early April, large microplankton (63–200 µm) occupied higher trophic positions than mesozooplankton (>200 µm), likely reflecting the predominance of nanoplankton (2–20 µm) that were not readily available to mesozooplankton grazers. Biomass and number of trophic levels increased during the spring bloom as elevated primary production allowed for a higher abundance of predatory species. During July, the plankton assemblage occupied relatively high trophic positions, indicating important links to the microbial loop and the recycling of organic matter. The strong correlation between biomass and community trophic level across the study suggests that the Celtic Sea is a relatively enclosed and predominantly energy-limited ecosystem. The progression of the zooplankton biomass and community structure within the central shelf region was different to that at the shelf-break, potentially reflecting increased predatory control of copepods by macrozooplankton and pelagic fishes at the shelf break. We suggest that the combination of size spectra and stable isotope techniques are highly complementary and useful for interpreting the seasonal progression of trophic interactions in the plankton.