A two-species distribution model for parapatric newts, with inferences on their history of spatial replacement

Biological Journal of the Linnean Society, Journal Year: 2022, Volume and Issue: 138(1), P. 75 - 88

Published: Nov. 22, 2022

Abstract Related species often engage in abutting or overlapping contact zones with various strengths of interspecific competition. Biotic interactions such as these preclude the registration full profile environmental variables that would describe otherwise larger ranges. Here, I advocate to forego range distribution modelling and instead focus on ecography zone, for example ‘two-species models’ (TSDMs), which presence data are contrasted against background data. The newts Triturus cristatus marmoratus meet west France. A countrywide TSDM suggests zone is located at a climatic gradient, line their north-eastern vs. south-western also ecologically segregated by elevation forestation, documented movement caused hedgerow removal lowland areas. Hindcasts Holocene suggest was positioned either same place present more south, depending amount forestation. forecast under climate warming predicts fast north, but this scenario deemed unrealistic. One reason recent habitat loss compromises dispersal expansion. Other pairs TSDMs have been applied listed comparison.

Language: Английский

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Jointly Modeling Species Niche and Phylogenetic Model in a Bayesian Hierarchical Framework

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2022, Volume and Issue: unknown

Published: July 8, 2022

ABSTRACT When studying how species will respond to climatic change, a common goal is predict distributions change through time. Environmental niche models (ENMs) are commonly used estimate species’ environmental from observed patterns of occurrence and predictors. However, often shaped by non-environmental factors–including biotic interactions dispersal barriers—truncating estimates. Though truncated may accurately present-day distribution within the sampled area, this accuracy decreases when predicting at different places under conditions. Modeling in phylogenetic framework leverages clade’s shared evolutionary history pull estimates closer towards conserved values farther away specific biases. We propose new Bayesian model estimation implemented R called BePhyNE (Bayesian Phylogenetic Niche Estimation). Under our model, ENM parameters transformed into biologically interpretable continuous optimum, breadth, tolerance evolving as multivariate Brownian motion. Through simulation analyses, we demonstrate precision that improve phylogeny size increases. also on eastern United States Plethodontid salamanders recover accurate niche, even data lacking entirely informed model. Our demonstrates novel where changes can be studied forwards backwards time understand ancestral ranges, specialization, niches data-deficient species.

Language: Английский

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Complex Hybridization in a Clade of Polytypic Salamanders (Plethodontidae:Desmognathus) Uncovered by Estimating Higher-Level Phylogenetic Networks

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 30, 2024

Abstract Hybridization between incipient lineages is a common feature of ecomorphological diversification. We examine these phenomena in the Pisgah clade Desmognathus salamanders from southern Appalachian Mountains eastern United States. The group contains four to seven species exhibiting two discrete phenotypes, aquatic “shovel-nosed” and semi-aquatic “black-bellied” forms. These ecomorphologies are ancient have apparently been transmitted repeatedly through introgression. Geographically proximate populations both phenotypes exhibit admixture, at least black-bellied produced via reticulations shovel-nosed parentals, suggesting complex transmission dynamics. However, computational constraints currently limit our ability reconstruct network radiations gene-tree data. Available methods limited level-1 networks wherein do not share edges, higher-level may be non-identifiable many cases. present heuristic approach recover information across range potentially identifiable empirical scenarios, supported by theory simulation. When extrinsic indicating location direction hybridization events available, method can yield successful estimates non-level-1 networks, or reduced possible set thereof. Phylogenomic data strongly support single backbone topology with up five overlapping hybrid edges. results suggest an unusual mechanism speciation, binary threshold trait causes hybrids shift microhabitat niches, promoting ecological divergence sympatric parentals. This contrasts other well-known systems which intermediate, novel, transgressive phenotypes. Finally, genetic basis unclear further needed clarify evolutionary morphological changes consequences.

Language: Английский

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The Origin and Ecology of a Likely Introduced Population of Southern Black-Bellied Salamanders (Desmognathus amphileucus)

Southeastern Naturalist, Journal Year: 2024, Volume and Issue: 23(1)

Published: Feb. 26, 2024

Characterizing the origin and ecology of introduced species is important for developing management plans. We discovered an isolated population black-bellied salamanders (Desmognathus sp.) in Piedmont Georgia, 30 km southwest their known range. used phylogenetic methods to confirm were D. amphileucus (Southern Black-Bellied Salamander), with closest relatives Blue Ridge. observed all life stages mark–recapture estimate a size 39 post-metamorphic individuals. gastric lavage document prey items novel diet studies but reported previously other Desmognathus. hypothesize this was likely via bait trade, has grown since introduction, consuming resources by native salamanders.

Language: Английский

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The limits of the metapopulation: Lineage fragmentation in a widespread terrestrial salamander (Plethodon cinereus)

Systematic Biology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 7, 2024

Abstract In vicariant species formation, divergence results primarily from periods of allopatry and restricted gene flow. Widespread harboring differentiated, geographically distinct sublineages offer a window into what may be common mode whereby originates, spreads across the landscape, then fragments multiple units. However, incipient lineages usually lack reproductive barriers that prevent their fusion upon secondary contact, blurring boundaries between single, large metapopulation-level lineage independent species. Here, we explore this model formation in Eastern Red-backed Salamander (Plethodon cinereus), widespread terrestrial vertebrate with at least 6 divergent mitochondrial clades throughout its range. Using anchored hybrid enrichment data, applied phylogenomic population genomic approaches to investigate patterns divergence, flow, contact. Genomic data broadly match most groups but reveal introgression extensive admixture several contact zones. While delimitation analyses Bayesian Phylogenetics Phylogeography supported 5 P. cinereus, genealogical indices (gdi) were highly sensitive inclusion admixed samples geographic representation candidate species, increasing support for when removing or limiting sampling single locality per group. An analysis morphometric revealed differences body size limb proportions among groups, reduction forelimb length warmer drier localities consistent increased fossoriality. We conclude cinereus is one structured component various degrees independence.

Language: Английский

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