Speciation Rates of Freshwater Fish Across the Americas Vary With Environmental Heterogeneity and Dispersal Ability DOI
David Griffiths

Journal of Biogeography, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

ABSTRACT Aims Species richnesses show marked spatial trends, but the contribution of speciation rates (SpecRates) to these trends is less clear. The roles environmental heterogeneity (topography and climate), glaciation, dispersal ability, times colonise, speciate large‐scale variation in SpecRates freshwater fish faunas are assessed. Location Atlantic Pacific coast drainages North, Central, South America. Taxon Fish. Methods Published information was compiled on SpecRates, phylogenies, colonisation times, species geographic distributions, migratory behaviour fishes 582 catchments. effects topographic climatic factors, including glaciation vagility, three rate metrics were examined using boosted regression tree models. Results Mean differ five‐fold across drainage regions with glaciation. highest Nearctic decline southwards, drainages, between Neotropical basins. Assemblage vary percentage species, heterogeneity, time, age. High associated postglacial recolonisation by rapidly speciating diadromous Neotropics for resident potamodromous higher than species. dispersing into an area more migratory, occur further north, have wider distributions diversifying situ. Endemicity recently colonised increases time levels. Main Conclusions Spatial temporal topography climate generate differences connectivity which, coupled abilities overcome barriers, result different areas.

Language: Английский

Phylogenomic species delimitation of studfishes (Fundulidae: Fundulus): evidence for cryptic species in agreement with the central highlands vicariance hypothesis DOI
Kayla M. Fast, Peter J. Hundt, Zachariah D. Alley

et al.

Zootaxa, Journal Year: 2025, Volume and Issue: 5604(3), P. 309 - 328

Published: March 13, 2025

The Central Highlands ecoregion of the eastern United States represents a hotspot freshwater biodiversity, with replicated patterns vicariant speciation east and west Mississippi River. Previous phylogeographic investigation studfishes (Fundulus subgenus Fundulus) revealed evidence for in Highlands, but data were limited to small number gene sequences generated Sanger sequencing. We used double digest restriction-site associated DNA sequencing (ddRADseq) improve resolution better characterize population genetic variation. Our sample design included individuals from Fundulus catenatus species group (F. catenatus, F. bifax, stellifer) two outgroup taxa julisia rathbuni). Phylogenetic analyses support monophyletic complex sister relationship Mobile Basin bifax stellifer). Population genomics delimitation tests provide three species-level subdivisions catenatus. describe as Tennessee River its drainages, caddo sp. nov., Ouachita cryptocatenatus occupying remainder range. Modally, was characterized by fewer left pectoral rays (16 vs. 17). nov. had modally anal (15 16) lateral scale rows (13 14). higher dorsal 14) caudal geographic distribution is likely result multiple pre-Pleistocene vicariance events congruent Vicariance Hypothesis well separate, possibly subsequent, dispersal events. Overall, results this study corroborate previous biogeographic history endemic rivers ecoregion. improved genomic variation among studfish populations will guide future studies morphological conservation plans rare biodiversity hotspot.

Language: Английский

Citations

0
Assembling the Pecos River fish fauna: barrier displacement on the Southern Great Plains, North America DOI Open Access
Christopher W. Hoagstrom,

Stephen Davenport,

Megan J. Osborne

et al.

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Barrier displacement by river capture is an important mechanism for the assembly of freshwater fish faunas. The production increasingly comprehensive and rigorously dated phylogentic trees major clades fishes, along with improved resolution in historical geomorphology, provide unprecedented opportunity to develop thorough biogeographical scenarios faunal that synthesise existing knowledge detailed context future study. Pecos River southwestern North America a textbook example drainage formation provides straightforward case capture. Fishes ultimately confined middle section (Capitan area endemism) have their closest relatives Brazos, Colorado (Texas), Red rivers, which served as ancient dispersal corridors from Mississippi drainage. Capitan endemism developed association two dissolution basins that, Late Miocene, captured headwaters these rivers. In Pliocene or Early Pleistocene, endorheic was overflowed into tributary Río Grande, became lower River. nascent also harboured endemic-fish assemblage part nexus springfed rivers (ancestral Devils River, River) comprised endemism. Even after through-flowing linked areas endemism, many endemic species remained only within original giving composite fauna. Grande connection later allowed fishes dispersing Gulf Mexico coast, aided Pleistocene sea-level falls glacial outbursts, not populate but disperse up Incision valley uplift Sangre de Cristo Mountains empowered headwater streams adjacent South Canadian bringing additional fishes. More recently, humans introduced at least 50 drainage, while human impacts fragmented native Non-native versus status remains uncertain several (e.g. Miniellus stramineus) multiple lineages diverse origin may exist some widespread, polytypic like Cyprinella lutrensis Pimephales promelas. fauna anomaly explainable complex geomorphological history produced it. As such, it unique studies fish-assemblage evolutionary ecology. Also, its neighbouring drainages helps clarify biogeography (as here). Further broadening this synthesis could support large spatial scales, illustrating potential now exists reconstructing regional river-drainage

Language: Английский

Citations

0
Speciation Rates of Freshwater Fish Across the Americas Vary With Environmental Heterogeneity and Dispersal Ability DOI
David Griffiths

Journal of Biogeography, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

ABSTRACT Aims Species richnesses show marked spatial trends, but the contribution of speciation rates (SpecRates) to these trends is less clear. The roles environmental heterogeneity (topography and climate), glaciation, dispersal ability, times colonise, speciate large‐scale variation in SpecRates freshwater fish faunas are assessed. Location Atlantic Pacific coast drainages North, Central, South America. Taxon Fish. Methods Published information was compiled on SpecRates, phylogenies, colonisation times, species geographic distributions, migratory behaviour fishes 582 catchments. effects topographic climatic factors, including glaciation vagility, three rate metrics were examined using boosted regression tree models. Results Mean differ five‐fold across drainage regions with glaciation. highest Nearctic decline southwards, drainages, between Neotropical basins. Assemblage vary percentage species, heterogeneity, time, age. High associated postglacial recolonisation by rapidly speciating diadromous Neotropics for resident potamodromous higher than species. dispersing into an area more migratory, occur further north, have wider distributions diversifying situ. Endemicity recently colonised increases time levels. Main Conclusions Spatial temporal topography climate generate differences connectivity which, coupled abilities overcome barriers, result different areas.

Language: Английский

Citations

0