Abstract
Harpacticoid copepods of the Chernaya Bay (White Sea) intertidal zone were collected in 45 surveys carried out from spring to autumn over a 25-year period (1996–2020) at three sites that differed in sediment properties. There were no significant long-term trends or seasonal cycles in total abundance. Regarding the species composition, the differences between sites were the most important source of variability over the whole period while the fine-scale (within-habitat) variability was low. Epibenthic species prevailed in fine silty sand, both burrowing and epibenthic species prevailed in medium sand, and interstitial and burrowing species prevailed in coarse sand. A comparison of the data on harpacticoid assemblages from a number of geographically remote loci corroborated the generality of this pattern. In a temporal dimension, the structure of each community was stable until the early 2000s, when the proportion of epibenthic, burrowing and interstitial species changed following changes in sediment properties (increasing siltation at sandy sites and decreasing siltation at the silty site). At each site, there was an increasing long-term trend in diversity (both in total richness and in expected species number). This increase was particularly apparent at sandy sites because of the appearance of epibenthic species. We suggest that sediment composition is the key factor determining the composition of harpacticoid assemblages in space and time. The “ecomorphological profile”, i.e., the proportion of species with different lifestyle and morphological traits, is a useful and informative indicator for describing and typifying these assemblages.
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The datasets generated and analyzed during this study, if not included its supplementary information files, are available from the corresponding author on reasonable request.
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Acknowledgements
This research was performed according to the Development program of the Interdisciplinary Scientific and Educational School of M.V. Lomonosov Moscow State University “The future of the planet and global environmental change”.
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This work was supported by the Russian Science Foundation (Grant No. 22-24-00007).
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All authors contributed to the study conception and design. Material preparation and data collection were performed by EC and LG, the analysis was performed by AA. The first draft of the manuscript was written by AA and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Azovsky, A.I., Chertoprud, E.S. & Garlitska, L.A. Environmental stability and long-term variability of harpacticoid copepod assemblages. Mar Biol 169, 67 (2022). https://doi.org/10.1007/s00227-022-04059-2
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DOI: https://doi.org/10.1007/s00227-022-04059-2