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01630 am a22002053u 4500 |
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368589 |
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|a Wagstaff, M.C.
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|a Howell, K.L.
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|a Bett, Brian J.
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|a Billett, David S.M.
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|a Brault, S.
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|a Stuart, C.T.
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|a Rex, M.A.
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|a β-diversity of deep-sea holothurians and asteroids along a bathymetric gradient (NE Atlantic)
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|c 2014-08-04.
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|u https://eprints.soton.ac.uk/368589/1/m508p177.pdf
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|a Measuring and understanding patterns of ?-diversity remain major challenges in community ecology. Recently, ?-diversity has been shown to consist of 2 distinct components: (1) spatial turnover and (2) species loss leading to nestedness. Both components structure deep-sea macrofaunal assemblages but vary in importance among taxa and ocean basins and with energy availability. Here, we present the first evidence for turnover and nestedness along a bathymetric gradient in 2 major megafaunal taxa, holothurians and asteroids. Turnover is the dominant component of ?-diversity throughout bathyal and abyssal zones in both taxa, despite major differences in ?-diversity and trophic composition. High spatial turnover suggests a role for evolutionary adaptation to environmental circumstances within depth bands. This pattern differs fundamentally from those in some macrofaunal groups in low-energy environments where abyssal nestedness is high and diversity low, with diversity maintained partly by source-sink dynamics.
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