Seasonal reproductive anatomy and sperm storage in pleurocerid gastropods (Cerithioidea: Pleuroceridae)

Whelan, Nathan V.; Strong, Ellen E.

doi:10.1139/cjz-2014-0165

Cited by 10 publications

(5 citation statements)

References 44 publications

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“…Previous mark-recapture studies (Houp, 1970;Huryn & Denny, 1997;Krieger & Burbank, 1976;Stewart, 2007) that documented upstream movement in pleurocerids did not include L. ampla, but we still predict our findings to be broadly applicable to other pleurocerids because of similar life histories and dispersal abilities (Huryn, Benke, & Ward, 1995;Huryn, Koebel, & Benke, 1994;Whelan et al, 2015;Whelan & Strong, 2014). Moreover, past studies focused on river reaches spanning hundreds of metres, whereas the closest two populations we examined were separated by 7.85 kilometres (Table 2).…”

Section: Downstream-biased Movement Patternsmentioning

confidence: 73%

Riverscape genetic variation, migration patterns, and morphological variation of the threatened Round Rocksnail, Leptoxis ampla

et al. 2019

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Within riverine systems, headwater populations are hypothesized to harbour higher amounts of genetic distinctiveness than populations in the main stem of a river and display increased genetic diversity in large, downstream habitats. However, these hypotheses were mostly developed with insects and fish, and they have not been tested on many invertebrate lineages. Pleuroceridae gastropods are of particular ecological importance to rivers of eastern North America, sometimes comprising over 90% of macroinvertebrate biomass. Yet, virtually nothing is known of pleurocerid landscape genetics, including whether genetic diversity follows predictions made by hypotheses developed on more mobile species. Moreover, the commonly repeated hypothesis that intraspecific morphological variation in gastropods results from ecophenotypic plasticity has not been well tested on pleurocerids. Using 2bRAD‐seq to discover single nucleotide polymorphisms, we show that the threatened, Cahaba River endemic pleurocerid, Leptoxis ampla, has limited gene flow among populations and that migration is downstream‐biased, conflicting with previous hypotheses. Both tributary and main stem populations harbour unique genomic profiles, and genetic diversity was highest in downstream populations. Furthermore, L. ampla shell morphology was more correlated with genetic differences among individuals and populations than habitat characteristics. We anticipate similar genetic and demographic patterns to be seen in other pleurocerids, and hypotheses about gene flow and population demographics that were based on more mobile taxa often, but not always, apply to freshwater gastropods. From a conservation standpoint, genetic structure of L. ampla populations suggests distinctive genetic diversity is lost with localized extirpation, a phenomenon common across the range of Pleuroceridae.

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Section: Downstream-biased Movement Patternsmentioning

confidence: 73%

Riverscape genetic variation, migration patterns, and morphological variation of the threatened Round Rocksnail, Leptoxis ampla

et al. 2019

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“…Ovoviviparity also evolved in several, more distantly related lineages of the Cerithioidea (Glaubrecht, , , , ; Köhler and Glaubrecht, ; Köhler et al., ; Rintelen and Glaubrecht, ; Glaubrecht and Strong, ; Rintelen et al., , ; Strong and Glaubrecht, ; Glaubrecht and Rintelen, ). All Pleuroceridae whose reproductive mode has been documented so far are oviparous (Stimpson, ; Jewell, ; van Cleave, ; Winsor, ; Woodard, ; Rosewater, ; Jones and Branson, ; Dazo, ; Houpe, ; Smith, ; Aldridge, ; Richardson et al., ; Burch, ; Miller‐Way and Way, ; Jokinen, ; Brown and Johnson, ; Strong, ; Hayes et al., ; Garner and Haggerty, ; Whelan et al., , ; Whelan and Strong, ). Oviparity as well as ovoviviparity has been documented in Semisulcospiridae (Davis, ; Kwon and Habe, ; Nakano, ; Takami, , ; Nakano and Izawa, ; Chang et al., , ; Prozorova and Rasshepkina, , ; Strong and Frest, ; Strong and Köhler, ; Kim et al., ).…”

Section: Discussionmentioning

confidence: 99%

Unparalleled disjunction or unexpected relationships? Molecular phylogeny and biogeography of Melanopsidae (Caenogastropoda: Cerithioidea), with the description of a new family and a new genus from the ancient continent Zealandia

Neiber

Glaubrecht

2018

Cladistics

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Melanopsidae are an important component of the freshwater fauna of the subtropical to temperate regions of the Western Palaearctic and also are reported from Zealandia, representing an unparalleled disjunction among a group of freshwater animals. We sequenced markers for species of all constituent genera covering the entire range of the group. Our phylogenetic analyses indicate that Melanopsidae are only monophyletic when excluding Holandriana from the Balkans, which was found to be more closely related to Pleuroceridae (eastern North America) and Semisuclospiridae (western North America and eastern Asia) than to the remaining melanopsids. It is, therefore, placed in the previously proposed family Amphimelaniidae. Zemelanopsis from New Zealand and Caledomelanella gen.n. from New Caledonia were recovered as a deeply divergent clade, here suggested to represent Zemelanopsidae fam.n. as the sister group of Melanopsidae s.s. The genus Microcolpia, including M. daudebartii and the extinct M. parreyssii, was recovered as a moderately well‐supported sister group of Melanopsis s.s., which comprises three distinct lineages: one from the western Mediterranean region, a second from the eastern Mediterranean region and the Near to Middle East, and a third from thermal springs in Tuscany. Although the Italian populations show little variability, both the eastern and western Melanopsis clades exhibit a high degree of variation in shell form and/or sculpture. Whether this is indicative of more than a species pair each (M. praemorsa/cariosa and M. buccinoidea/costata) within the eastern and western clade, respectively, or the result of parallel evolution currently cannot be answered with certainty. Distinct populations were not recovered as monophyletic clades in some cases, which may indicate incomplete reproductive isolation. We compare the timeframe for the evolution of major “melanopsid” lineages with geological events, and elucidate scenarios that may have shaped the distribution patterns observed today.

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“…Pallial oviducts of reproductively active females (i.e. those collected in the spring; Whelan & Strong ) were examined using a Leica MZ 12.5 dissecting microscope (Leica, Wetzler, Germany); toluidine blue was used to enhance contrast as necessary (see Table for number of individuals examined from each collection site and clade). No reproductively active P. prasinata individuals produced divergent haplotypes, but reproductive anatomy of modal individuals is presented for comparative purposes.…”

Section: Methodsmentioning

confidence: 99%

Morphology, molecules and taxonomy: extreme incongruence in pleurocerids (Gastropoda, Cerithioidea, Pleuroceridae)

Whelan

Strong

2015

Zoologica Scripta

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E. (2016). Morphology, molecules and taxonomy: extreme incongruence in pleurocerids (Gastropoda, Cerithioidea, Pleuroceridae). -Zoologica Scripta, 45, 62-87. Pronounced mitochondrial heterogeneity within putative species of Pleuroceridae has prevented meaningful systematic revisions of this critically imperilled freshwater family. Previous studies have demonstrated that this mitochondrial diversity often produces polyphyletic species on mitochondrial gene trees, but its significance is unclear. Hypotheses advanced to explain this pattern have included cryptic species, retained ancestral polymorphisms and introgression; other possible explanations such as doubly uniparental inheritance or the presence of pseudogenes have not been given due consideration. Previous analyses have not included adequate sampling, neither in terms of number of individuals nor in geographic coverage, to adequately test any of these hypotheses. To fully characterize mitochondrial heterogeneity in pleurocerids and robustly assess possible causal explanations, we collected 239 individuals representing four putative species from seven sites and sequenced the COI and 16S rRNA mitochondrial genes and the H3 nuclear gene for all individuals. We also used whole-genome shotgun sequencing to construct and annotate a mitochondrial genome for one individual. Characters with demonstrated utility in morphospecies delineation of gastropods (head-foot coloration, shell and radular morphology, pallial oviduct anatomy) were examined for a subset of individuals to determine whether morphology co-varied by haplotype clade. We found pronounced mitochondrial heterogeneity at both the population level and species level in three of the species examined, but our data reject paralogous nuclear copies of mitochondrial genes (NUMTs) and doubly uniparental inheritance as causal mechanisms, and there was no evidence of cryptic diversity. Mutation rates were found to differ significantly among mitochondrial lineages, and population genetic statistics revealed a signature of balancing selection that could be acting to maintain this diversity. The observed pattern is similar to that seen in lineages with inherited endosymbionts like Wolbachia infections, which merits further investigation. Although questions remain concerning the precise cause(s) of intraspecific mitochondrial diversity in pleurocerids, nuclear and/or genomic data, combined with anatomical and life history investigations in an integrative phylogenetic context, is the most promising avenue for resolving pleurocerid systematics.

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Seasonal reproductive anatomy and sperm storage in pleurocerid gastropods (Cerithioidea: Pleuroceridae)

Cited by 10 publications

References 44 publications

Riverscape genetic variation, migration patterns, and morphological variation of the threatened Round Rocksnail, Leptoxis ampla

Riverscape genetic variation, migration patterns, and morphological variation of the threatened Round Rocksnail, Leptoxis ampla

Unparalleled disjunction or unexpected relationships? Molecular phylogeny and biogeography of Melanopsidae (Caenogastropoda: Cerithioidea), with the description of a new family and a new genus from the ancient continent Zealandia

Morphology, molecules and taxonomy: extreme incongruence in pleurocerids (Gastropoda, Cerithioidea, Pleuroceridae)

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