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Latitudinal diversity gradients for five taxonomic levels of marine fish in depth zones


Lin, H-Y and Corkrey, R and Kaschner, K and Garilao, C and Costello, MJ, Latitudinal diversity gradients for five taxonomic levels of marine fish in depth zones, Ecological Research pp. 1-15. ISSN 0912-3814 (2020) [Refereed Article]

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Copyright 2020 The Ecological Society of Japan

DOI: doi:10.1111/1440-1703.12193


Latitudinal diversity gradients (LDGs) of species richness in most marine taxa appear to be bimodal with a dip at the equator. We compared LDGs for modeled ranges of 5,619 marine fish species, and distinguished between: all, pelagic, demersal, bony and cartilaginous fish groups; five taxonomic levels of class, order, family, genus and species; and four depth zones namely whole water column, 0200 m, 2001,000 m, and 1,0006,000 m; at 5 latitudinal intervals. The modality of 88 LDGs was examined visually and using Hartigan's dip statistic. We found 80 LDGs were bimodal (or not unimodal), two gradients were unimodal and six gradients were ambiguous. All species and genera, and 19 families among fish groups and depth zones had bimodal or not unimodal LDGs. The northern hemisphere mode had 26% greater richness from species to order richness. Overall fish, the peak of richness shifted poleward across taxonomic levels, from 25N for species to median 48N for class and from 10S for genus to 35S for class. Temperature and salinity were significantly correlated with the LDG. Our findings using fish species ranges support previous analyses using species' occurrences, namely that the LDG of marine species is bimodal, by generalizing this to all taxonomic levels and depth zones. That the LDG with a dip near the equator supports the hypothesis that it is primarily temperature driven, and that the equator is already too hot for some species.

Item Details

Item Type:Refereed Article
Keywords:latitudinal diversity gradients, marine fish, modality, taxonomic levels, temperature
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine biodiversity
UTAS Author:Corkrey, R (Dr Ross Corkrey)
ID Code:141909
Year Published:2020
Web of Science® Times Cited:2
Deposited By:TIA - Research Institute
Deposited On:2020-12-02
Last Modified:2021-02-15

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