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Small-scale spatial patterns of meiobenthos in the Arctic deep sea

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Abstract

A variety of analytical techniques were used to quantify and describe small-scale (centimetre to decimetre) spatial patterns of meiofauna taxa, with emphasis on nematode species, at a bathyal site in the Arctic deep sea. Three cores (10-cm diameter) taken from the same multicorer were each subsampled as 12 contiguous subcores (1.2-cm diameter) for meiofauna and 16 contiguous subcores (0.9-cm diameter) for bacteria (eight subcores) and phytodetritus (chl a and phaeopigment concentration) (eight subcores). Coefficients of variation and the variance component from PERMANOVA were estimated to compare variability between cores (20–50 cm) versus within cores (≤10 cm). Both methods showed that spatial variation within cores contributed the main part of total heterogeneity for all parameters, while differences between cores were less important. To further investigate distribution patterns at this small scale (≤10 cm), indices of dispersion were calculated and autocorrelation analyses were performed on the complete data set. Abundances of nematodes, nauplii and 65.5% of the nematode species were significantly aggregated at the scale of subcores (2 cm). Nematode species aggregations were discordant on the small scale, suggesting that processes maintaining diversity in the deep sea can be expected to operate at scales smaller than 10 cm. Autocorrelograms suggested that nematode patch sizes were smaller than 4 cm2, while adult harpacticoid copepods and nauplii showed aggregations of ca. 9–25 cm2 and 64 cm2, respectively. Significant spatial autocorrelation at the core scale was also observed for 24 nematode species. These species were grouped in ten different spatial patterns according to their scale of heterogeneity. The spatial patterns observed for the meiobenthos were neither explained by the concentration of chloroplastic pigments nor by bacterial densities. Nevertheless, observations on nematode morphology suggest that morphological characters linked to their locomotion and feeding behaviour may be involved in pattern formation. Finally, our data provide evidence that studies based on few replicates to characterise large-scale or long-term patterns of deep-sea benthic communities may be confounded by inadequate assessment of small-scale variability.

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Acknowledgments

We thank the crew of the RV Maria S. Merian for their support during the summer expedition of 2006 and Dr. T. Soltwedel for providing the multicorer samples. Special thanks are due to C. Kanzog for kindly sharing her expertise on bacterial methods. We are grateful to two anonymous reviewers for their constructive comments on an earlier version of the manuscript. F.G. was sponsored by a PhD fellowship from the DAAD and the Helmholtz Association. G.F. was supported by the Brazilian Ministry of Science and Technology (CNPq). T.M. is a postdoctoral fellow with the Flemish Fund for Scientific Research (FWO).

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Gallucci, F., Moens, T. & Fonseca, G. Small-scale spatial patterns of meiobenthos in the Arctic deep sea. Mar Biodiv 39, 9–25 (2009). https://doi.org/10.1007/s12526-009-0003-x

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