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8 results for “Ambystoma macrodactylum”
Fig. 3 in Acute mortality in California tiger salamander (Ambystoma californiense) and Santa Cruz long-toed salamander (Ambystoma macrodactylum croceum) caused by Ribeiroia ondatrae (Class: Trematoda)
Fig. 3. Ribeiroia ondatrae cercaria from Planorbella sp. collected from Ellicott Pond in Ellicott Slough National Wildlife Refuge, Santa Cruz County, California, U.S.A.
Fig. 4 in Acute mortality in California tiger salamander (Ambystoma californiense) and Santa Cruz long-toed salamander (Ambystoma macrodactylum croceum) caused by Ribeiroia ondatrae (Class: Trematoda)
Fig. 4. Molecular phylogenetic analysis by Maximum Likelihood method based on the Hasegawa-Kishino-Yano plus G model with 500 bootstrap replications based on partial 28S rRNA gene sequences of Ribeiroia ondatrae metacercariae from California tiger salamanders (Ambystoma californiense), cercariae from Planorbella sp. and sequences of R. ondatrae publicly available in GenBank with Notocotylus attenuatus as an outgroup. Tree is drawn to scale with branch lengths measure in the number of substitutions per site. The analysis involved 13 nucleotide sequences. All positions with less than 95% site coverage were eliminated. There was a total of 1189 positions in the final dataset.
Fig. 2 in Acute mortality in California tiger salamander (Ambystoma californiense) and Santa Cruz long-toed salamander (Ambystoma macrodactylum croceum) caused by Ribeiroia ondatrae (Class: Trematoda)
Fig. 2. Photomicrograph of California tiger salamanders (Ambystoma californiense) in late-stage metamorphosis from a mortality event in the Ellicott Slough National Wildlife Refuge in Santa Cruz County, California, U.S.A. (A) Cross-section of dorsal tail showing widespread ulcerative dermatitis with superficial serocellular crust formation and intralesional metacercariae (asterisk) (H&E). (B) Metacercariae (asterisk) associated with mixed cellular to granulomatous inflammation widespread in the gills and subcutis (PAS). Inset: Encysted metacercariae are surrounded by mixed-cellular to granulomatous to infiltrate (H&E).
Fig. 1 in Acute mortality in California tiger salamander (Ambystoma californiense) and Santa Cruz long-toed salamander (Ambystoma macrodactylum croceum) caused by Ribeiroia ondatrae (Class: Trematoda)
Fig. 1. Gross photographs of ethanol-fixed salamanders in late-stage metamorphosis from a mortality event in the Ellicott Slough National Wildlife Refuge (ESNWR) in Santa Cruz County, California, U.S.A. showing integumentary lesions. (A) California tiger salamander (Ambystoma californiense) exhibiting an extensive roughening of the skin with multifocal ulceration around the eyes, gular fold, and dorsal tail (arrows). (B) Santa Cruz long-toed salamander (Ambystoma macrodactylum croceum) with ulceration and crust formation on the gular fold and base of the tail (arrow).
Data from: The importance (or lack thereof) of niche divergence to the maintenance of a northern species complex: the case of the long-toed salamander (Ambystoma macrodactylum Baird)
The relative importance of ecological versus non-ecological factors for the origin and maintenance of species is an open question in evolutionary biology. Young lineages—such as the distinct genetic groups that make up the ranges of many northern species—represent an opportunity to study the importance of ecological divergence during the early stages of diversification. Yet, few studies have examined the extent of niche divergence between lineages in previously glaciated regions and the role of ecology in maintaining the contact zones between them. In this study, we used tests of niche overlap in combination with ecological niche models to explore the extent of niche divergence between lineages of the long-toed salamander (Ambystoma macrodactylum Baird) species complex and to determine whether contact zones correspond to (divergent) niche limits. We found limited evidence for niche divergence between the different long-toed salamander lineages, substantial overlap in the predicted distribution of suitable climatic space for all lineages and range limits that are independent of niche limits. These results raise questions as to the importance of ecological divergence to the development of this widespread species complex and highlight the potential for non-ecological factors to play a more important role in the maintenance of northern taxa.
Data from: Individual performance in relation to cytonuclear discordance in a northern contact zone between long-toed salamander (Ambystoma macrodactylum) lineages
Cytonuclear discordance in contact zones between related lineages is common, with mitochondrial clines often being displaced from clines in nuclear allele frequency. Proposed explanations for such a pattern include adaptive introgression of mtDNA or a neutral wake of mtDNA being left behind following hybrid zone movement. However, studies investigating these hypotheses are rare. Our previous survey of genetic variation in the long-toed salamander (Ambystoma macrodactylum) highlighted a potential case of cytonuclear discordance between two lineages in western Canada. Here, we use additional markers and samples to clarify the extent of this discordance. We simultaneously assess the feeding performance of individuals in a common environment to test for an association between mitotype and individual performance. The genetic results confirm a general pattern of cytonuclear discordance in the focal region. However, we also observed more limited introgression of a diagnostic nuclear marker. Intriguingly, although there were differences in individual performance associated with the transition between mitotypes, these differences were not fully explained by mitotype. Instead, the lowest performance was observed in individuals demonstrating the greatest mismatch between mtDNA and all nuclear markers, suggesting the potential for cytonuclear incompatibilities to be acting. These results highlight the complexity of understanding the causes and consequences of mtDNA introgression and cytonuclear discordance in contact zones.
Data from: The importance (or lack thereof) of niche divergence to the maintenance of a northern species complex: the case of the long-toed salamander (Ambystoma macrodactylum Baird)
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Data from: Individual performance in relation to cytonuclear discordance in a northern contact zone between long-toed salamander (Ambystoma macrodactylum) lineages
Open the record for dataset details and reuse information.
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