Evolutionary time and species diversity in aquatic ecosystems worldwide

被引:4
作者
Rabosky, Daniel L. [1 ,2 ]
机构
[1] Univ Michigan, Museum Zool, 2032 Biol Sci Bldg, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Dept Ecol & Evolutionary Biol, 2032 Biol Sci Bldg, Ann Arbor, MI 48109 USA
关键词
biodiversity; species richness; diversification; deep sea; polar; biome; lake; marine; ocean; latitudinal diversity gradient; DEEP-SEA; ADAPTIVE RADIATION; MARINE BIODIVERSITY; LATITUDINAL GRADIENTS; RICHNESS PATTERNS; SPECIATION; ENERGY; LAKE; SCALE; MODEL;
D O I
10.1111/brv.12884
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The latitudinal diversity gradient (LDG) is frequently described as the most dramatic biodiversity pattern on Earth, yet ecologists and biogeographers have failed to reach consensus on its primary cause. A key problem in explaining the LDG involves collinearity between multiple factors that are predicted to affect species richness in the same direction. In terrestrial systems, energy input, geographic area, and evolutionary time for species accumulation tend to covary positively with species richness at the largest spatial scales, such that their individual contributions to the LDG are confounded in global analyses. I review three diversity patterns from marine and freshwater systems that break this collinearity and which may thus provide stronger tests of the influence of time on global richness gradients. Specifically, I contrast biodiversity patterns along oceanic depth gradients, in geologically young versus ancient lakes, and in the north versus south polar marine biomes. I focus primarily on fishes due to greater data availability but synthesize patterns for invertebrates where possible. I find that regional-to-global species richness generally declines with depth in the oceans, despite the great age and stability of the deep-sea biome. Geologically ancient lakes generally do not contain more species than young lakes, and the Antarctic marine biome is not appreciably more species rich than the much younger Arctic marine biome. However, endemism is consistently higher in older systems. Patterns for invertebrate groups are less clear than for fishes and reflect a critical need for primary biodiversity data. In summary, the available data suggest that species richness is either decoupled from or only weakly related to the amount of time for diversification. These results suggest that energy, productivity, or geographic area are the primary drivers of large-scale diversity gradients. To the extent that marine and terrestrial diversity gradients result from similar processes, these examples provide evidence against a primary role for evolutionary time as the cause of the LDG.
引用
收藏
页码:2090 / 2105
页数:16
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