Phylogenetic Relationships within the Aquatic Snail Genus Tryonia: Implications for Biogeography of the North American Southwest

Hershler, Robert; Liu, Hsiu‐Ping; Mulvey, Margaret

doi:10.1006/mpev.1999.0659

Cited by 56 publications

(41 citation statements)

References 70 publications

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“…The division of the clades suggests that a relatively long amount of time elapsed to produce genetic lineage diversification in the region, which is not reflected in the morphology of the shell (see Figure 3). This is not infrequent in rissooidean snails, a taxon with a large number of genera, many of which include species morphologically similar but genetically divergent (e.g., Liu et al 2003;Hershler et al 1999;Hershler et al 2003;Bichain et al 2007;Hershler et al 2007;Falniowski et al 2012). The percentage sequence divergence between the Heleobia species observed in the present study was generally greater than those found in other rissooidean taxa.…”

Section: Discussioncontrasting

confidence: 40%

Hidden diversity in spring snails from the Andean Altiplano, the second highest plateau on Earth, and the Atacama Desert, the driest place in the world

2013

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Background: The Chilean Altiplano and the Atacama Desert in northern Chile harbor isolated hydrological systems or oases where it is possible to find minute aquatic snails of the genus Heleobia whose taxonomy is uncertain and where many populations remain unknown. Here, we obtained samples from 30 localities distributed in the region and used molecular (12S and 16S mitochondrial genes) and morphological (penis) characters to investigate diversity of this poorly known fauna. Results: Molecular phylogenetic analysis consistently recovered five clades, one of which constitutes a cryptic species previously assigned to a species recognized in the area. Four other clades contained sequences of one nominal species consistent with its type locality and at least two additional candidate species, which were corroborated by a particular penis morphology. Furthermore, some morphological differences in penis morphology were observed in two Altiplano populations not resolved by the DNA sequences, providing support for two additional candidate species in the genus. A molecular clock analysis allowed tracing the origin of lineages back to the Early Pleistocene.

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Section: Discussioncontrasting

confidence: 40%

Hidden diversity in spring snails from the Andean Altiplano, the second highest plateau on Earth, and the Atacama Desert, the driest place in the world

2013

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“…Presumably, this is due to the greater dispersal ability of the latter and is reflected in the taxonomy of these groups (multiple amphipod and pupfish species vs. several populations within a single described species of Gambusia). Aquatic snails of the family Hydrobiidae from this region (which are presumably even less vagile than amphipods) showed very high levels of variation among these same sites, with multiple species and genera present in the Pecos basin (Hershler et al 1999).…”

Section: Regional Patterns Within the Chihuahuan Desert-thementioning

confidence: 92%

Genetic diversity in the Gammarus pecos species complex: Implications for conservation and regional biogeography in the Chihuahuan Desert

Gervasio

Berg

Lang³

et al. 2004

Limnology & Oceanography

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We used allozyme electrophoresis to quantify genetic variation in nine populations of the Gammarus pecos species complex endemic to spring systems of the northern Chihuahuan Desert. There was significant within-population and high among-population genetic variation. Two populations exhibited heterozygote deficiencies and high proportions of polymorphic loci, which suggests the presence of cryptic species. Genetic distances among populations were negatively correlated with previously published morphological similarities, which suggests congruence between allozyme and morphological phenotypes. Cluster analysis of genetic distances showed four major groups of populations within the G. pecos complex. Genetic identities and fixed allelic differences support the presence of at least four distinct species: Gammarus desperatus, G. pecos, Gammarus hyalleloides, and one or more undescribed species. Relatively large genetic distances between populations suggest long periods of isolation and allopatric speciation. Patterns of among-population genetic variation were similar between amphipods and several groups of endemic fishes and snails, which suggests a coherence to biogeographic patterns within this region. Thus, the understanding of the genetic structure and taxonomic status of the G. pecos species complex provides insight into the biogeography of other aquatic organisms in the northern Chihuahuan Desert. Given the alarming rate at which desert spring systems are being altered and the unique biotic assemblages present, protection of these habitats is imperative.In desert regions, springs have long been considered to be unlimited sources of water for a variety of human activities. The habitat destruction resulting from such activities is an especially severe problem when it affects regions of high endemism, where most endangered species are found (Dob-

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“…Nucleotide composition was typical of a mitochondrial gene (Collins et al, 1996;Hershler et al, 1999). Average base frequencies for the total data set were 24.8% A, 38.4% T, 17.3% C, and 19.5% G. Base frequencies were homogeneous across all sites (x^ = 28.31, df = 39, P = 0.89), but not at the third codon positions (A:' = 122.6, df = 39, P = 0.00) ( Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…Ten of these sequences are newly reported herein and others were previously reported by Hershler et al (1999). We have sampled cochhopines from all of the major geographic regions where these snails occur except tropical Africa (to which the genus Lobogenes is endemic), and we included in our analysis two or more representatives of each of the three subgroups of cochhopines proposed by Hershler and Thompson (1992).…”

Section: Specimensmentioning

confidence: 99%

Phylogenetic Relationships of the Cochliopinae (Rissooidea: Hydrobiidae): An Enigmatic Group of Aquatic Gastropods

Liu

Hershler

Thompson

2001

Molecular Phylogenetics and Evolution

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Phylogenetic Relationships within the Aquatic Snail Genus Tryonia: Implications for Biogeography of the North American Southwest

Cited by 56 publications

References 70 publications

Hidden diversity in spring snails from the Andean Altiplano, the second highest plateau on Earth, and the Atacama Desert, the driest place in the world

Hidden diversity in spring snails from the Andean Altiplano, the second highest plateau on Earth, and the Atacama Desert, the driest place in the world

Genetic diversity in the Gammarus pecos species complex: Implications for conservation and regional biogeography in the Chihuahuan Desert

Phylogenetic Relationships of the Cochliopinae (Rissooidea: Hydrobiidae): An Enigmatic Group of Aquatic Gastropods

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