The latitudinal speciation gradient in freshwater fishes: higher speciation at higher latitudes in the northern hemisphere

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Март 13, 2025

Speciation rates are a key driver of diversity patterns and often used to explain the latitudinal gradient (LDG). However, variation in speciation at both assemblage species levels remains poorly explored freshwater fishes. This highlights gap understanding mechanisms driving geographic biodiversity gradients Here, we investigated fishes, using comprehensive database fish distributions phylogenetic relationships Actinopterygian We estimated three metrics (BAMM, DR, ClaDS) evaluated through spatial regressions levels. Finally, analyzed those based on assemblage's structure. Our results show that areas with highest were located tropics. general pattern revealed positive relationship between absolute latitude rates. is generally absent tropical regions below 23.8° became significant only higher latitudes, particularly Northern Hemisphere. do not find level, mainly due strong influence hyper-diverse groups like Cichliformes. When Cichliformes excluded, significant, aligning assemblage-level results. The whit also match recent radiation clustering all latitudes. septentrional assemblages high rates, which reflects environmental filtering dispersal events consistent glaciation deglaciation Pleistocene.

Язык: Английский

Freshwater Habitats Promote Rapid Rates of Phenotypic Evolution in Sculpin Fishes (Perciformes: Cottoidea)

The American Naturalist, Год журнала: 2024, Номер 204(4), С. 345 - 360

Опубликована: Июнь 13, 2024

AbstractInvasions of freshwater habitats by marine fishes provide exceptional cases habitat-driven biological diversification. Freshwater make up less than 1% aquatic but contain ∼50% fish species. However, while the dominant group (Otophysi) is older that most (Percomorphaceae), it morphologically diverse. Classically, scientists have invoked differences in tempo and/or mode evolution to explain such unequal morphological We tested for evidence these phenomena superfamily Cottoidea (sculpins), which contains substantial radiations and fishes. find morphology sculpins evolves faster under higher constraint sculpins, causing widespread convergence more disparity sculpins. The endemic Lake Baikal, Siberia, are exceptions demonstrate elevated novelty akin Several tantalizing factors may findings, as habitat stability connectivity between systems.

Язык: Английский

Reduced evolutionary constraint accompanies ongoing radiation in deep-sea anglerfishes

Nature Ecology & Evolution, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 27, 2024

Язык: Английский