Population Sex Ratios of Pleurocerid Snails (<i>Leptoxis</i>spp.): Variability and Relationships with Environmental Contaminants and Conditions

Ciparis, Serena; Henley, William F.; Voshell, J. Reese

doi:10.4003/006.030.0208

Cited by 6 publications

(6 citation statements)

References 57 publications

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“…Xu et al (2016) reported for the golden apple snail Pomacea canaliculata (Lamarck, 1828) that the sex ratio is influenced by temperature and precipitation, while Yusa (2007) linked the variation to genetic causes. Ciparis, Henley & Voshell (2012) also found that population sex ratios in snails of the genus Leptoxis Rafinesque, 1819 vary according to the water temperature. Neves, Valentin & Figueiredo (2013) mentioned that the sex ratio in H. australis can be affected by organotin compound, mainly tributyltin (TBT).…”

Section: Discussionmentioning

confidence: 92%

“…Adult sex ratio has implications on fitness, breeding potential, behavior, mating system, sexual selection, life history, population demography, invasiveness of alien species and conservation biology (Le Galliard et al, 2005;Skalski, Ryding & Millspaugh, 2005;Kokko & Jennions, 2008;Liker et al, 2015;Székely, Weissing & Komdeur, 2014;Pipoly et al, 2015;Xu et al, 2016;Carmona-Isunza et al, 2017;Rodriguero et al, 2019). The sex ratio in natural populations may vary due to genetic causes, pollution and environmental factors, and may even present temporary differences (Hirai et al, 2004;Yusa, 2007;Ciparis, Henley & Voshell, 2012;Neves, Valentin & Figueiredo, 2013;Carmona-Isunza et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

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Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Collado

Chihuailaf²,

Muñoz-Herrera³

et al. 2021

PeerJ

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Knowing the reproductive biology of threatened species is essential for conservation and to establish proper management plans. Heleobia atacamensis, a freshwater snail only known from two locations in the Atacama Saltpan, northern Chile, is currently classified as Data Deficient on the IUCN Red List and Critically Endangered by the Ministerio del Medio Ambiente of Chile. Based on size-frequency distribution, multivariate analysis of shell measurements, and microdissections, we studied the reproductive strategy, recruitment period, sex ratio and sexual dimorphism in this species. Heleobia atacamensis is an oviparous species, with direct development (non-planktotrophic). Females lay capsules of a single egg from which a juvenile resembling a miniature adult hatches after intracapsular metamorphosis is completed. The development type was confirmed by the observation of a paucispiral protoconch (= protoconch I) using scanning electron microscopy. Recruitment was observed across the four seasons of the year, with an increment at the end of austral summer. Results also showed that sex ratio was 1:1, whereas sexual dimorphism was not detected using univariate and multivariate analysis of the shell. The reproductive data provided in this study are a starting point for future management plans.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Collado

Chihuailaf²,

Muñoz-Herrera³

et al. 2021

PeerJ

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show abstract

“…Twenty‐five sites, located near outlets of delineated 12‐digit, sixth‐level Hydrologic Unit Code subcatchments, were sampled during a preliminary study in 2007. Fifteen sites in 12 Shenandoah River tributaries had relatively large populations of pleurocerid snails in stable riffles and were selected for the current study (Table , for a detailed site map see Ciparis, Henley & Voshell, ). Three of the tributaries drained multiple subcatchments, and an upstream (US) sampling site was located in the primary subcatchment as well as a downstream (DS) site draining multiple subcatchments (Table ).…”

Section: Methodsmentioning

confidence: 99%

Relationships between nutrient enrichment, pleurocerid snail density and trematode infection rate in streams

2013

Self Cite

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Summary Nutrient enrichment is a widespread environmental problem in freshwater ecosystems. Eutrophic conditions caused by nutrient enrichment may result in a higher prevalence of infection by trematode parasites in host populations, due to greater resource availability for the molluscan first intermediate hosts. This study examined relationships among land use, environmental variables indicating eutrophication, population density of the pleurocerid snail, Leptoxis carinata, and trematode infections. Fifteen study sites were located in streams within the Shenandoah River catchment (Virginia, U.S.A.), where widespread nutrient enrichment has occurred. Snail population density had a weak positive relationship with stream water nutrient concentration. Snail population density also increased as human activities within stream catchments increased, but density did not continue to increase in catchments where anthropogenic disturbance was greatest. Cercariae from five families of trematodes were identified in L. carinata, and infection rate was generally low (<10%). Neither total infection rate nor the infection rate of individual trematode types showed a positive relationship with snail population density, nutrients or land use. There were statistically significant but weak relationships between the prevalence of infection by two trematode families and physical and biological variables. The prevalence of Notocotylidae was positively related to water depth, which may be related to habitat use by definitive hosts. Prevalence of Opecoelidae had a negative relationship with orthophosphate concentration and a polynomial relationship with chlorophyll a concentration. Transmission of Opecoelid trematodes between hosts may be inhibited by eutrophic conditions. Leptoxis carinata appears to be a useful species for monitoring the biological effects of eutrophication and investigating trematode transmission dynamics in lotic systems.

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“…Interestingly, some pleurocerid populations are characterized by female‐biased sex ratios (Aldridge ; Ciparis et al . ), which could indicate a male‐killing or feminizing endosymbiont such as Wolbachia (Huger et al . ; Werren et al .…”

Section: Discussionmentioning

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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Population Sex Ratios of Pleurocerid Snails (Leptoxisspp.): Variability and Relationships with Environmental Contaminants and Conditions

Cited by 6 publications

References 57 publications

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Relationships between nutrient enrichment, pleurocerid snail density and trematode infection rate in streams

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

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