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Distribution of hadal genera depends on the lower limits of their bathymetrical ranges
Mironov, A.N.; Kremenetskaia, A. (2022). Distribution of hadal genera depends on the lower limits of their bathymetrical ranges. Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 185: 103787. https://dx.doi.org/10.1016/j.dsr.2022.103787
In: Deep-Sea Research, Part I. Oceanographic Research Papers. Elsevier: Oxford. ISSN 0967-0637; e-ISSN 1879-0119
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| Author keywords |
Hadal trench; Hadal fauna; Colonization; Tolerance; Biotic boundary; Ubiqiust |
| Auteurs | | Top |
- Mironov, A.N.
- Kremenetskaia, A.
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| Abstract |
A list of genera represented in the hadal zone (>6000 m), 22 trenches, two trench faults, and two basins was compiled for Tanaidacea, Isopoda, Bivalvia and five classes of Echinodermata. Among these 161 genera, hadal endemics comprised only 4%, which is lower than the previous estimate. Geographic and bathymetric distributions were examined in four groups of genera based on their lower bathymetric distribution limits: i) 6001–7000 m, ii) 7001–8000 m, iii) 8001–9000 m and iv) greater than 9000 m. These groups were compared by the percentage of genera with a narrow and wide geographical distribution in the hadal zone and in the world ocean from intertidal to hadal depths. Most of the hadal genera were characterized by a wide geographic range at shallower depths and a narrow geographic range in the hadal zone. Almost half of the 161 genera considered in this study had lower limits at 6001–7000 m. The percentage of narrowly distributed in the hadal genera found only in one trench decreases from 72% to 4% from the first to fourth group, whereas the proportion of widely distributed genera known from four or more trenches increases from 3% to 70%. Lower limit of the vertical distribution is positively correlated with the number of trenches and other hadal areas where the genera occurred. The wide distribution of the deepest-dwelling genera at hadal depths suggests that the most successful colonization of the hadal zone results from the high tolerance of some genera to multiple factors, including hydrostatic pressure, food distribution, topography, and potential ecological interactions. The lower hadal zone seems to be inhabited mainly by ubiquists. |
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