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

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Latitudinal diversity gradients for five taxonomic levels of marine fish in depth zones
Ecological Research ( IF 1.7 ) Pub Date : 2020-12-01 , DOI: 10.1111/1440-1703.12193
Han‐Yang Lin ₁ , Ross Corkrey ₂ , Kristin Kaschner ₃ , Cristina Garilao ₄ , Mark J. Costello ₅

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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, 0–200 m, 200–1,000 m, and 1,000–6,000 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 2–6% greater richness from species to order richness. Overall fish, the peak of richness shifted poleward across taxonomic levels, from 25°N for species to median 48°N for class and from 10°S for genus to 35°S 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.

中文翻译：

深度区域中五个海洋生物分类水平的纬度多样性梯度

大多数海洋生物分类中物种丰富度的纬度多样性梯度（LDGs）似乎是双峰的，在赤道处有一个倾角。我们比较了LDG在5,619种海洋鱼类的建模范围内的区别，并区分了：所有，远洋，深海，硬骨和软骨鱼类；类别，次序，科，属和物种的五个分类学等级；四个深度带，即整个水柱，0-200 m，200-1,000 m和1,000-6,000 m；以5°的纬度间隔。使用Hartigan的Dip统计数据对88个LDG的模态进行了视觉检查。我们发现80个LDG是双峰的（或不是单峰的），两个梯度是单峰的，六个梯度是模棱两可的。所有物种和属以及鱼类群和深度区中的19个科系均具有双峰或非单峰的LDG。从物种到有序的丰富度，北半球模式的丰富度增加了2–6％。总体上，鱼类的丰富度峰值在生物分类水平上发生了极高的偏移，从物种的25°N到类别的中值48°N，从属的10°S到类别的35°S。温度和盐度与LDG显着相关。我们使用鱼类物种范围的发现支持先前使用物种发生的分析，即海洋物种的LDG是双峰的，方法是将其归纳到所有分类学水平和深度区域。LDG在赤道附近有倾角支持了以下假设：它主要是温度驱动的，并且赤道对于某些物种而言已经太热了。我们使用鱼类物种范围的发现支持以前使用物种发生的分析，即通过将其归类到所有分类学水平和深度区域，海洋物种的LDG是双峰的。LDG在赤道附近有倾角支持了以下假设：它主要是温度驱动的，并且赤道对于某些物种而言已经太热了。我们使用鱼类物种范围的发现支持以前使用物种发生的分析，即通过将其归类到所有分类学水平和深度区域，海洋物种的LDG是双峰的。LDG在赤道附近有倾角支持了以下假设：它主要是温度驱动的，并且赤道对于某些物种而言已经太热了。

更新日期：2020-12-01

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