Uta stansburiana and Elgaria multicarinata on the California Channel Islands: Natural Dispersal or Artificial Introduction?

Mahoney, Meredith J.; Parks, Duncan S.; Fellers, Gary M.

doi:10.1670/24-01a

Cited by 8 publications

(16 citation statements)

References 6 publications

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“…Phylogeographic concordance across the islands -Studies of other taxa inhabiting the California Channel Islands has revealed several diff erent patterns of gene fl ow and colonization of the islands, including connectedness of populations on the four northern islands ( Gilbert et al, 1990 ;Ramirez and Beckwitt, 1995 ;Mundy et al, 1997 ;Landry et al, 1999 ;Coyer et al, 2008 ;Chatzimanolis et al, 2010 ), as well as between Santa Catalina and San Clemente ( Gilbert et al, 1990 ;Mahoney et al, 2003 ;Coyer et al, 2008 ;Wallace and Helenurm, 2009 ;Chatzimanolis et al, 2010 ). Genetic isolation is also apparent among some taxa on San Clemente ( Ramirez and Beckwitt, 1995 ;Mundy et al, 1997 ;Furches et al, 2009 ).…”

Section: Discussionmentioning

confidence: 99%

Phylogeography and genetic structure of endemic Acmispon argophyllus and A. dendroideus (Fabaceae) across the California Channel Islands

Wallace

Wheeler

McGlaughlin

et al. 2017

American J of Botany

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Section: Discussionmentioning

confidence: 99%

Phylogeography and genetic structure of endemic Acmispon argophyllus and A. dendroideus (Fabaceae) across the California Channel Islands

Wallace

Wheeler

McGlaughlin

et al. 2017

American J of Botany

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“…sp.) (Vandergast et al, 2006), and genetic variation in side-blotched lizards (Uta stansburiana) (Mahoney, Parks & Fellers, 2003). The only other salamander reported from Catalina Island is the arboreal salamander, A. lugubris; this report is based on a single specimen from 1941 from the Middle Ranch area (Hilton, 1945).…”

Section: Origin Of Island Populations Of B Majormentioning

confidence: 90%

Slender salamanders (genusBatrachoseps) reveal Southern California to be a center for the diversification, persistence, and introduction of salamander lineages

Jockusch

Hansen

Fisher

et al. 2020

PeerJ

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Background The southern California biodiversity hotspot has had a complex geological history, with both plate tectonic forces and sea level changes repeatedly reconfiguring the region, and likely driving both lineage splittings and extinctions. Here we investigate patterns of genetic divergence in two species of slender salamanders (Plethodontidae: Batrachoseps) in this region. The complex geological history in combination with several organismal traits led us to predict that these species harbor multiple ancient mitochondrial lineages endemic to southern California. These species belong to a clade characterized by fine-scale mitochondrial structure, which has been shown to track ancient splits. Both focal species, Batrachoseps major and B. nigriventris, are relatively widely distributed in southern California, and estimated to have persisted there across millions of years. Recently several extralimital populations of Batrachoseps were found in the San Joaquin Valley of California, a former desert area that has been extensively modified for agriculture. The origins of these populations are unknown, but based on morphology, they are hypothesized to result from human-mediated introductions of B. major. Methods We sequenced the mitochondrial gene cytochrome b from a geographically comprehensive sampling of the mitochondrial lineages of B. major and B. nigriventris that are endemic to southern California. We used phylogenetic analyses to characterize phylogeographic structure and identify mitochondrial contact zones. We also included the San Joaquin Valley samples to test whether they resulted from introductions. We used a bootstrap resampling approach to compare the strength of isolation-by-distance in both Batrachoseps species and four other salamander species with which they co-occur in southern California. Results The northern lineage of B. major harbors at least eight deeply differentiated, geographically cohesive mitochondrial subclades. We identify geographic contact between many of these mtDNA lineages and some biogeographic features that are concordant with lineage boundaries. Batrachoseps nigriventris also has multiple deeply differentiated clades within the region. Comparative analyses highlight the smaller spatial scales over which mitochondrial divergence accumulates in Batrachoseps relative to most other salamander species in southern California. The extralimital populations of Batrachoseps from the San Joaquin Valley are assigned to B. major and are shown to result from at least two independent introductions from different source populations. We also suggest that B. major on Catalina Island, where it is considered native, may be the result of an introduction. Some of the same traits that facilitate the build-up of deep phylogeographic structure in Batrachoseps likely also contribute to its propensity for introductions, and we anticipate that additional introduced populations will be discovered.

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“…First, the central northern island, Santa Cruz Island, is the highest and most topographically diverse in the archipelago and may have acted as a refugium for insular lineages during periods of partial or complete inundation of the lower islands (Muhs et al, 2004). lizards, Mahoney, Parks & Fellers, 2003;foxes, Rick et al, 2009;skunks, Floyd et al, 2011) and, thus, do not provide an adequate test of this pattern. This would be expected to leave a genetic signal in disparate taxa of many alleles on southern islands dating to a colonization pulse following the last sea-level highstand (e.g.…”

Section: Colonizationmentioning

confidence: 99%

“…The only taxa for which phylogenetic dates have been estimated have diverged much more recently (e.g. lizards, Mahoney, Parks & Fellers, 2003;foxes, Rick et al, 2009;skunks, Floyd et al, 2011) and, thus, do not provide an adequate test of this pattern. Our sequence data do not allow estimation of reliable divergence dates, but there is no evidence of more diverse lineages on the northern islands (Table 1), although an early split between E. arborescens and E. giganteum is inferred in every tree (Fig.…”

Section: Colonizationmentioning

confidence: 99%

Narrow water barriers prevent multiple colonizations and limit gene flow among California Channel Island wild buckwheats (Eriogonum: Polygonaceae)

2016

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The relative roles of chance colonization and subsequent gene flow in the development of insular endemic biotas have been extensively studied in remote oceanic archipelagos, but are less well characterized on nearshore island systems. The current study investigated patterns of colonization and divergence between and within two wild buckwheat species (Polygonaceae), Eriogonum arborescens and E. giganteum, endemic to the California Channel Islands to determine whether geographical isolation is driving diversification. Using plastid and nuclear sequence data and microsatellite allele frequencies, we determined that gene flow in these Eriogonum spp. is restricted by isolation. The data suggest that successful colonization of and gene flow among the islands are infrequent. Colonization appears to have followed a stepping-stone model that is consistent with a north-to-south pattern across the islands. This colonization pattern coupled with relatively little post-colonization inter-island gene flow, particularly among southern islands, has generated a pattern of more divergent lineages on the isolated southern islands. These results run counter to the general expectation that all islands close to a continental source should receive a high level of gene flow. Finally, management recommendations focused on protecting the lineages from loss of private alleles and the erosion of the remaining genetic diversity are offered.

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Uta stansburiana and Elgaria multicarinata on the California Channel Islands: Natural Dispersal or Artificial Introduction?

Cited by 8 publications

References 6 publications

Phylogeography and genetic structure of endemic Acmispon argophyllus and A. dendroideus (Fabaceae) across the California Channel Islands

Phylogeography and genetic structure of endemic Acmispon argophyllus and A. dendroideus (Fabaceae) across the California Channel Islands

Slender salamanders (genusBatrachoseps) reveal Southern California to be a center for the diversification, persistence, and introduction of salamander lineages

Narrow water barriers prevent multiple colonizations and limit gene flow among California Channel Island wild buckwheats (Eriogonum: Polygonaceae)

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