Crossing the uncrossable: novel trans‐valley biogeographic patterns revealed in the genetic history of low‐dispersal mygalomorph spiders (Antrodiaetidae,<i>Antrodiaetus</i>) from California

Hedin, Marshal; Starrett, James; Hayashi, Cheryl Y.

doi:10.1111/mec.12130

Cited by 65 publications

(76 citation statements)

References 77 publications

(168 reference statements)

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“…4a) and climatic conditions connecting the two regions may have been more suitable at that time. The pattern of a trans-valley leak from the Coast Ranges to the central Sierra Nevada across the Central Valley has been observed in many other species including Batrachoseps attenuatus [7], Ensatina eschscholtzii xanthoptica [6], Contia tenuis [10], Lampropeltis zonata [47], and California Turret Spiders [66].…”

Section: Genetic Divergence Within Major Clades Sierra Nevadamentioning

confidence: 86%

Cryptic diversity and biogeographical patterns within the black salamander (Aneides flavipunctatus) complex

Reilly

Wake

2014

Journal of Biogeography

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Aim Phylogeographical structure in the black salamander (Aneides flavipunctatus) was inferred using two independent genetic datasets. Concordance between the datasets was sought in order to evaluate earlier suggestions of species‐level breaks and evidence of vicariance and long‐term isolation within the complex. We hypothesized that major phylogeographical breaks would either correspond to current tectonic plate boundaries or to historical geological processes. Location North‐western California and southern Oregon (USA). Methods Three mitochondrial DNA (mtDNA) genes were sequenced for 240 black salamanders from 136 localities, and up to 13 nuclear DNA loci were sequenced for 145 black salamanders representing 93 localities. Phylogenetic analysis of our mitochondrial dataset was performed to recover major lineages, while spatial clustering analysis of our nuclear dataset was utilized to identify points of concordance with our mtDNA phylogeny. Levels of gene flow were estimated for all contact zones. Results Our mitochondrial phylogeny recovered four major lineages. Cluster analysis of our nuclear dataset is consistent with a four‐population scheme, with the boundaries matching those of the mtDNA lineages. Gene flow across a contact zone in southern Humboldt between two of the populational units is extremely limited (2Nm < 1). In what is identified as the Central Core population, two distinctive subpopulations were delineated based on nuclear data, but mitochondrial data are discordant. Main conclusions The Aneides flavipunctatus complex comprises at least four species‐level units. Two of the boundaries between these units are associated with current tectonic plate boundaries. The contact zone between our Northwest and Central Core populations lies adjacent to the Mendocino Triple Junction (MTJ), where the Humboldt and North American plates meet, while the area separating the Santa Cruz and Central Core populations corresponds to the boundary between the Pacific and Humboldt tectonic plates. The phylogeographical break within the Central Core population lies in a region in which uplift occurred that is associated with the historical position of the migrating MTJ.

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Section: Genetic Divergence Within Major Clades Sierra Nevadamentioning

confidence: 86%

Cryptic diversity and biogeographical patterns within the black salamander (Aneides flavipunctatus) complex

Reilly

Wake

2014

Journal of Biogeography

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“…Also as in Hedin et al . (), we calibrated the molecular clock with a mean ± SD of 0.0169 ± 0.0019 (Papadopoulou et al ., ).…”

Section: Methodsmentioning

confidence: 99%

Miocene extensional tectonics explain ancient patterns of diversification among turret‐building tarantulas (Aphonopelma mojave group) in the Mojave and Sonoran deserts

Graham

Hendrixson

Hamilton

et al. 2015

Journal of Biogeography

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Aim Phylogeographical studies in the Mojave and Sonoran deserts often find genetic discontinuities that pre-date the Pleistocene. A recent synthesis of phylogeographical data, called the Mojave Assembly Model, provides a hypothesis for the historical assembly of these desert biotas but does not adequately capture the complexity of pre-Pleistocene vicariance events. We tested this model and assessed pre-Pleistocene divergences by exploring the phylogeography of the Aphonopelma mojave group, which is composed of turret-building tarantula species from the Mojave and Sonoran deserts.Location Mojave and Sonoran deserts, south-western USA.Methods We augmented the sampling from a previous study by sequencing mitochondrial DNA (COI) from new material of the A. mojave group. We used phylogenetic and network analyses to identify clades and a molecular clock and lineages-through-time plots (LTT plots) to explore the timing and tempo of diversification. We tested for demographic expansion using neutrality tests and mismatch distributions. Species distribution models (SDMs) were constructed to compare current suitable habitat to that at the Last Glacial Maximum (LGM).Results Phylogenetic, network and molecular-clock analyses identified six major clades that probably diverged during the late Miocene. The rate of diversification appears to have slowed during the Pliocene. Most clades exhibit signals of recent demographic expansion. SDMs predicted that suitable habitat shifted south and to lower elevations during the LGM.Main conclusions Phylogeographical analyses suggest that the A. mojave group experienced a burst of diversification in the late Miocene, followed by population expansions during the Pleistocene. Six major clades with origins in the late Miocene cannot be adequately explained by the Mojave Assembly Model. We propose the novel hypothesis that Miocene extensional tectonics caused populations to diverge in allopatry by producing low-elevation habitat barriers. Geological models, such as kinematic reconstructions, provide an ideal but underutilized framework for testing biogeographical hypotheses in these deserts and the wider Basin and Range Province.

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“…Habitat fragmentation can increase the probability of local extinctions by destroying effective metapopulation structures. Rivers [29], roads [30]–[32] and valleys [33] all act as geographic barriers for the dispersal of some animal populations, but not for others. For example, rivers may act as physical barriers limiting the dispersal from one edge to the other for northern cavefish [34] and white-tailed deer [29], while they don't work for Chimpanzee [35] and Euglossini [36].…”

Section: Introductionmentioning

confidence: 99%

Geographic Distance Affects Dispersal of the Patchy Distributed Greater Long-Tailed Hamster (Tscherskia triton)

Xue

Zhong

et al. 2014

PLoS ONE

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Dispersal is a fundamental process in ecology influencing the genetic structure and the viability of populations. Understanding how variable factors influence the dispersal of the population is becoming an important question in animal ecology. To date, geographic distance and geographic barriers are often considered as main factors impacting dispersal, but their effects are variable depending on different conditions. In general, geographic barriers affect more significantly than geographic distance on dispersal. In rapidly expanding populations, however, geographic barriers have less effect on dispersal than geographic distance. The effects of both geographic distance and geographic barriers in low-density populations with patchy distributions are poorly understood. By using a panel of 10 microsatellite loci we investigated the genetic structure of three patchy-distributed populations of the Greater long-tailed hamster (Tscherskia triton) from Raoyang, Guan and Shunyi counties of the North China Plain. The results showed that (i) high genetic diversity and differentiation exist in three geographic populations with patchy distributions; (ii) gene flow occurs among these three populations with physical barriers of Beijing city and Hutuo River, which potentially restricted the dispersal of the animal; (iii) the gene flow is negatively correlated with the geographic distance, while the genetic distance shows the positive correlation. Our results suggest that the effect of the physical barriers is conditional-dependent, including barrier capacity or individual potentially dispersal ability. Geographic distance also acts as an important factor affecting dispersal for the patchy distributed geographic populations. So, gene flow is effective, even at relatively long distances, in balancing the effect of geographic barrier in this study.

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Crossing the uncrossable: novel trans‐valley biogeographic patterns revealed in the genetic history of low‐dispersal mygalomorph spiders (Antrodiaetidae,Antrodiaetus) from California

Cited by 65 publications

References 77 publications

Cryptic diversity and biogeographical patterns within the black salamander (Aneides flavipunctatus) complex

Cryptic diversity and biogeographical patterns within the black salamander (Aneides flavipunctatus) complex

Miocene extensional tectonics explain ancient patterns of diversification among turret‐building tarantulas (Aphonopelma mojave group) in the Mojave and Sonoran deserts

Geographic Distance Affects Dispersal of the Patchy Distributed Greater Long-Tailed Hamster (Tscherskia triton)

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