On the Origins of the Insect Fauna of California's Channel Islands: A Comparative Phylogeographic Study of Island Beetles

Caterino, Michael S.; Chatzimanolis, Stylianos; Richmond, Maxi Polihronakis

doi:10.3398/042.007.0121

Cited by 8 publications

(3 citation statements)

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“…Moreover, distance‐dependent differentiation among island populations was not higher than among adjacent mainland populations (see also Su, Wang, & Deng, ). Although our results generally contrast with work on island populations (Frankham, ; Franks, ), some studies have either failed to detect reduced diversity (Désamoré et al., ; García‐Verdugo et al., ; Su et al., ) or found even higher diversity in island than mainland populations of the same species (Caterino, Chatzimanolis, & Polihronakis Richmond, ; Chiang et al., ; Désamoré et al., ; Fernández‐Mazuecos & Vargas, ).…”

Section: Discussioncontrasting

confidence: 99%

Consequences of multiple mating‐system shifts for population and range‐wide genetic structure in a coastal dune plant

López-Villalobos

Eckert

2018

Molecular Ecology

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Evolutionary transitions from outcrossing to selfing can strongly affect the genetic diversity and structure of species at multiple spatial scales. We investigated the genetic consequences of mating-system shifts in the North American, Pacific coast dune endemic plant Camissoniopsis cheiranthifolia (Onagraceae) by assaying variation at 13 nuclear (n) and six chloroplast (cp) microsatellite (SSR) loci for 38 populations across the species range. As predicted from the expected reduction in effective population size (N ) caused by selfing, small-flowered, predominantly selfing (SF) populations had much lower nSSR diversity (but not cpSSR) than large-flowered, predominantly outcrossing (LF) populations. The reduction in nSSR diversity was greater than expected from the effects of selfing on N alone, but could not be accounted for by indirect effects of selfing on population density. Although selfing should reduce gene flow, SF populations were not more genetically differentiated than LF populations. We detected five clusters of nSSR genotypes and three groups of cpSSR haplotypes across the species range consisting of parapatric groups of populations that usually (but not always) differed in mating system, suggesting that selfing may often initiate ecogeographic isolation. However, lineage-wide genetic variation was not lower for selfing clusters, failing to support the hypothesis that selection for reproductive assurance spurred the evolution of selfing in this species. Within three populations where LF and SF plants coexist, we detected genetic differentiation among diverged floral phenotypes suggesting that reproductive isolation (probably postzygotic) may help maintain the striking mating-system differentiation observed across the range of this species.

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Section: Discussioncontrasting

confidence: 99%

Consequences of multiple mating‐system shifts for population and range‐wide genetic structure in a coastal dune plant

López-Villalobos

Eckert

2018

Molecular Ecology

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“…Similar results have been found in other Channel Island studies (e.g. Caterino et al, 2015; Hofman et al, 2016), as well as other near‐shore island systems (e.g. Marchán et al, 2020).…”

Section: Discussionsupporting

confidence: 90%

“…Beyond this shared phylogeographic divergence between the two groups of islands, each taxon exhibits unique histories of colonization, dispersal and divergence rather than a common dispersal route or mechanism. Similar results have been found in other Channel Island studies (e.g Caterino et al, 2015;Hofman et al, 2016),. as well as other near-shore island systems (e.g Marchán et al, 2020)…”

supporting

confidence: 92%

Near‐shore island lizard fauna shaped by a combination of human‐mediated and natural dispersal

Salerno

Chan

Pauly

et al. 2022

Journal of Biogeography

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Aim Island biotas provide opportunities to study colonization and adaptation to novel environments. Islands, especially near‐shore islands, may have a long record of human habitation such that some lineages result from human‐assisted introductions. Here, we combine phylogenetic analyses with fossil data and historical specimen records to reconstruct colonization histories, characterize among‐island divergence and assess the role of humans in shaping the evolutionary history of lizards inhabiting a near‐shore island archipelago. Location Channel Islands and adjacent mainland of California, United States. Taxa Western fence lizard (Sceloporus occidentalis), southern alligator lizard (Elgaria multicarinata), common side‐blotched lizard (Uta stansburiana). Methods We sequenced mitochondrial DNA (ND1, cyt‐b) from each of three lizard species, covering their entire island distributions plus the adjacent mainland. For each, we estimated diversity within and among each island, obtained maximum likelihood bootstrapped phylogenies, constructed haplotype networks and tested for population expansion. We used museum specimen records and microfossil evidence to infer colonization scenarios. Results Sceloporus occidentalis is characterized by a single island‐colonization event, and exhibits the deepest divergences from mainland relatives and the highest among‐island divergence. Elgaria multicarinata and Uta stansburiana each have at least three distinct colonization events, with fossil and historical data indicating that some of these occurred after humans arrived to the islands. Main Conclusions The evolution of Channel Island lineages for two lizard taxa has been mediated by ancient and contemporary anthropogenic activity, while the evolution of the third is shaped by natural dispersal and vicariance caused by sea‐level rise. Genetic divergence corroborates the treatment of S. occidentalis as an endemic island species, Sceloporus becki. The unique histories of these three taxa are synthesized with other Channel Island lineages highlighting that taxa inhabiting islands with long histories of human activity should be carefully studied to assess the role of people in facilitating colonization and subsequent gene flow.

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Phylogeny of the Family Staphylinidae Based on Molecular Data: A Review

Gusarov

2018

Biology of Rove Beetles (Staphylinidae)

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On the Origins of the Insect Fauna of California's Channel Islands: A Comparative Phylogeographic Study of Island Beetles

Cited by 8 publications

References 50 publications

Consequences of multiple mating‐system shifts for population and range‐wide genetic structure in a coastal dune plant

Consequences of multiple mating‐system shifts for population and range‐wide genetic structure in a coastal dune plant

Near‐shore island lizard fauna shaped by a combination of human‐mediated and natural dispersal

Phylogeny of the Family Staphylinidae Based on Molecular Data: A Review

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