The global decline of freshwater bivalves (Unionida) has prompted many programmes for their conservation and augmentation, which often include a captive breeding component. One key point to such programmes is the collection, maintenance and use of mussel glochidium larvae, which require attachment to a fish host in a sensitive parasitic stage of their life cycle. Understanding the thermal limits of glochidia can increase knowledge of mussel larval survival and ultimately aid in the development of conservation programmes. Glochidia of the endangered thick-shelled river mussel Unio crassus and the non-native Chinese pond mussel Sinanodonta woodiana were observed for active clamping ability at 5, 15, 17, 20 and 25 °C over the course of a 7-d period. The results from this study confirm that an inverse relationship between water temperature and larval viability can be observed in both species. Additionally, the significantly higher thermal tolerance of S. woodiana indicates that the species exhibits competitive invasive behaviour beginning from the larval stage. These findings also suggest that the collection and transportation of glochidia from genetically important yet distant populations is feasible if the larvae can be maintained at temperatures between 5 and 15 °C.
{"title":"Effects of water temperature on glochidium viability of Unio crassus and Sinanodonta woodiana: implications for conservation, management and captive breeding","authors":"Alia Benedict, J. Geist","doi":"10.1093/MOLLUS/EYAB011","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAB011","url":null,"abstract":"\u0000 The global decline of freshwater bivalves (Unionida) has prompted many programmes for their conservation and augmentation, which often include a captive breeding component. One key point to such programmes is the collection, maintenance and use of mussel glochidium larvae, which require attachment to a fish host in a sensitive parasitic stage of their life cycle. Understanding the thermal limits of glochidia can increase knowledge of mussel larval survival and ultimately aid in the development of conservation programmes. Glochidia of the endangered thick-shelled river mussel Unio crassus and the non-native Chinese pond mussel Sinanodonta woodiana were observed for active clamping ability at 5, 15, 17, 20 and 25 °C over the course of a 7-d period. The results from this study confirm that an inverse relationship between water temperature and larval viability can be observed in both species. Additionally, the significantly higher thermal tolerance of S. woodiana indicates that the species exhibits competitive invasive behaviour beginning from the larval stage. These findings also suggest that the collection and transportation of glochidia from genetically important yet distant populations is feasible if the larvae can be maintained at temperatures between 5 and 15 °C.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/MOLLUS/EYAB011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48414648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Statocyst content in Aeolidida (Nudibranchia) is an uninformative character for phylogenetic studies","authors":"C. Baumann, E. Laetz, H. Wägele","doi":"10.1093/MOLLUS/EYAB009","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAB009","url":null,"abstract":"","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/MOLLUS/EYAB009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49115778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The morphological identification of many groups of gastropods is mostly based on shell morphology and genital structures. The value of opercular characters as taxonomic characters has so far been barely studied and evaluated. Here, the opercular characters of river snails (Viviparidae) have been revised systematically for the first time. Based on a morphological study of the opercula of 38 species of 25 viviparid genera, 16 newly defined opercular characters are shown to be useful for genus and species identification. A detailed diagnosis and description of opercular characters for each genus/species is given. One new generic assignment of a viviparid species is proposed based on this study, namely Cipangopaludina nagaensis n. comb.
许多腹足类动物的形态学鉴定主要基于外壳形态和生殖结构。目前对眼性状作为分类性状的研究和评价甚少。本文首次对河螺(胎生科)的眼观特征进行了系统的修正。本文对25个胎生属38种的胎生盖进行了形态学研究，发现有16个新定义的胎生盖特征可用于属和种的鉴定。给出了每个属/种的详细诊断和眼特征描述。在此基础上提出了一种胎生种的新属分配，即Cipangopaludina nagaensis n. comb。
{"title":"The neglected operculum: a revision of the opercular characters in river snails (Caenogastropoda: Viviparidae)","authors":"Le-Jia Zhang, T. Rintelen","doi":"10.1093/MOLLUS/EYAB008","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAB008","url":null,"abstract":"\u0000 The morphological identification of many groups of gastropods is mostly based on shell morphology and genital structures. The value of opercular characters as taxonomic characters has so far been barely studied and evaluated. Here, the opercular characters of river snails (Viviparidae) have been revised systematically for the first time. Based on a morphological study of the opercula of 38 species of 25 viviparid genera, 16 newly defined opercular characters are shown to be useful for genus and species identification. A detailed diagnosis and description of opercular characters for each genus/species is given. One new generic assignment of a viviparid species is proposed based on this study, namely Cipangopaludina nagaensis n. comb.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/MOLLUS/EYAB008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43084800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. A. Barrientos-Lujan, F. Rodríguez-Zaragoza, A. López-Pérez
The diversity of gastropods and bivalves, total mollusc richness and total mollusc abundance were analysed for three substrates (coral, rock and sand) in the coral and reef ecosystems of the Mexican Tropical Pacific (MTP). Up to 3,828 individuals (70% gastropods and 30% bivalves), belonging to 209 species (146 gastropods and 63 bivalves), were identified; this is one of the most diverse molluscan faunas (2.77 species/m2) associated with reef systems in the MTP. Evaluation of the sampling effort demonstrated that 80% of gastropod species and 93% of bivalve species inhabiting the reef system were recovered. The highest abundance occurred in the coral substrate (1,939 individuals), while the highest species richness was found on the rock substrate (131 species). The analysis showed that the greatest spatial variation in total mollusc, gastropod and bivalve diversity occurred among different substrates within individual localities, with minor differences among assemblages with increasing spatial scale reflecting the relative homogeneity of the molluscan fauna in the study area. While the gastropods Conus nux, Steironepion piperatum and Muricopsis zeteki accounted for differences among different regions, and Vermicularia pellucida eburnea and Bostrycapulus aculeatus accounted for differences among states, the abundances of M. zeteki, B. aculeatus and V. pellucida eburnea were related to differences in diversity at the scale of individual localities. Among bivalves, Leiosolenus aristatus, L. plumula and Gastrochaena ovata accounted for differences between regions, states and localities, respectively. Overall, the study shows that species composition is influenced by both the substrate and the geographical location of assemblages. This indicates that conservation strategies should address preserving habitat heterogeneity at local scales in the study area.
{"title":"Richness, abundance and spatial heterogeneity of gastropods and bivalves in coral ecosystems across the Mexican Tropical Pacific","authors":"N. A. Barrientos-Lujan, F. Rodríguez-Zaragoza, A. López-Pérez","doi":"10.1093/MOLLUS/EYAB004","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAB004","url":null,"abstract":"\u0000 The diversity of gastropods and bivalves, total mollusc richness and total mollusc abundance were analysed for three substrates (coral, rock and sand) in the coral and reef ecosystems of the Mexican Tropical Pacific (MTP). Up to 3,828 individuals (70% gastropods and 30% bivalves), belonging to 209 species (146 gastropods and 63 bivalves), were identified; this is one of the most diverse molluscan faunas (2.77 species/m2) associated with reef systems in the MTP. Evaluation of the sampling effort demonstrated that 80% of gastropod species and 93% of bivalve species inhabiting the reef system were recovered. The highest abundance occurred in the coral substrate (1,939 individuals), while the highest species richness was found on the rock substrate (131 species). The analysis showed that the greatest spatial variation in total mollusc, gastropod and bivalve diversity occurred among different substrates within individual localities, with minor differences among assemblages with increasing spatial scale reflecting the relative homogeneity of the molluscan fauna in the study area. While the gastropods Conus nux, Steironepion piperatum and Muricopsis zeteki accounted for differences among different regions, and Vermicularia pellucida eburnea and Bostrycapulus aculeatus accounted for differences among states, the abundances of M. zeteki, B. aculeatus and V. pellucida eburnea were related to differences in diversity at the scale of individual localities. Among bivalves, Leiosolenus aristatus, L. plumula and Gastrochaena ovata accounted for differences between regions, states and localities, respectively. Overall, the study shows that species composition is influenced by both the substrate and the geographical location of assemblages. This indicates that conservation strategies should address preserving habitat heterogeneity at local scales in the study area.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/MOLLUS/EYAB004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42525960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fernanda Cabrera, A. Breure, W. Norbis, S. Martínez
In the Late Cretaceous fossil record of Uruguay, three morphotypes of Bulimulus (Bulimulidae) have been recorded: Bulimulus klappenbachi and two undescribed ones. A geometric morphometric analysis was conducted to show whether the three morphotypes represent one or more species. With this aim, the three fossils were compared with three extant species of the same genus: Bulimulus bonariensis, B. guadalupensis and B. rushi. Variability within and among these three well-known extant species was tested to evaluate differences in the fossil morphotypes. Twenty-eight landmarks were selected (9 permanent landmarks and 19 semi-landmarks) and principal component analysis and canonical variate analysis were performed. Results indicate that only one of the unnamed morphotypes can be described as a new species and that the other is a variant of B. klappenbachi. The latter fossil species is described as Bulimulus frenguellii n. sp.
{"title":"Description of a new Late Cretaceous species of Bulimulus Leach, 1814 (Orthalicoidea: Bulimulidae) using geometric morphometric analysis","authors":"Fernanda Cabrera, A. Breure, W. Norbis, S. Martínez","doi":"10.1093/MOLLUS/EYAB006","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAB006","url":null,"abstract":"\u0000 In the Late Cretaceous fossil record of Uruguay, three morphotypes of Bulimulus (Bulimulidae) have been recorded: Bulimulus klappenbachi and two undescribed ones. A geometric morphometric analysis was conducted to show whether the three morphotypes represent one or more species. With this aim, the three fossils were compared with three extant species of the same genus: Bulimulus bonariensis, B. guadalupensis and B. rushi. Variability within and among these three well-known extant species was tested to evaluate differences in the fossil morphotypes. Twenty-eight landmarks were selected (9 permanent landmarks and 19 semi-landmarks) and principal component analysis and canonical variate analysis were performed. Results indicate that only one of the unnamed morphotypes can be described as a new species and that the other is a variant of B. klappenbachi. The latter fossil species is described as Bulimulus frenguellii n. sp.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47539222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Radula packing and storage facilitated by tooth morphology in selected taenioglossan Gastropoda","authors":"W. Krings, S. Gorb","doi":"10.1093/MOLLUS/EYAB007","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAB007","url":null,"abstract":"","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49205369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Omar Hernando Avila-Poveda, Quetzalli Yasu Abadia-Chanona, Isis Laura Alvarez-Garcia, M. Arellano-Martínez
{"title":"Plasticity in reproductive traits of an intertidal rocky shore chiton (Polyplacophora: Chitonida) under pre-ENSO and ENSO events","authors":"Omar Hernando Avila-Poveda, Quetzalli Yasu Abadia-Chanona, Isis Laura Alvarez-Garcia, M. Arellano-Martínez","doi":"10.1093/mollus/eyaa033","DOIUrl":"https://doi.org/10.1093/mollus/eyaa033","url":null,"abstract":"","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43293163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Bunet, Jean-Marc Prevot, N. Vicente, J. R. García-March, Rajko Martinović, J. Tena-Medialdea, D. Joksimović, Jean-Luc Bonnefont, S. Coupé
The noble pen shell Pinna nobilis is a Mediterranean endemic and emblematic giant bivalve. Already considered by the late 20th century to be an endangered species, it is facing a dramatic and rapidly expanding epizooty that has decimated populations since mid-2016. The ecological importance of P. nobilis has prompted important investigations for conservation purposes. Here, we report a first analysis of the whole genome sequencing of this animal. This was performed on an Illumina HiSeq X platform using a single paired-end library of short fragments (2 × 150 bp). The de novo contig assembly had a total size of 584 Mb (96,738 contigs, N50 = 7.6 kb, with 0.4% of ambiguous nucleotides), representing 77.5% of the predicted genome size of 754 Mb. The P. nobilis genome is highly AT-rich, with a GC content of 35.6%. At 1%, heterozygosity was in the range of other bivalves with sequenced genomes. Over one-third (36.2%) of the genome consisted of repeated elements with a surprising larger number of short interspersed nuclear elements compared to other molluscan genomes. We were also able to reconstruct the full mitochondrial genome (c. 19 kb, with 12 protein-coding genes, 2 rRNA and 22 tRNA genes). In the context of the epizootic outbreak affecting P. nobilis, a first insight into the innate immune and stress-related genes found in the sequence is provided.
{"title":"First insight into the whole genome shotgun sequence of the endangered noble pen shell Pinna nobilis: a giant bivalve undergoing a mass mortality event","authors":"R. Bunet, Jean-Marc Prevot, N. Vicente, J. R. García-March, Rajko Martinović, J. Tena-Medialdea, D. Joksimović, Jean-Luc Bonnefont, S. Coupé","doi":"10.1093/MOLLUS/EYAA041","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAA041","url":null,"abstract":"\u0000 The noble pen shell Pinna nobilis is a Mediterranean endemic and emblematic giant bivalve. Already considered by the late 20th century to be an endangered species, it is facing a dramatic and rapidly expanding epizooty that has decimated populations since mid-2016. The ecological importance of P. nobilis has prompted important investigations for conservation purposes. Here, we report a first analysis of the whole genome sequencing of this animal. This was performed on an Illumina HiSeq X platform using a single paired-end library of short fragments (2 × 150 bp). The de novo contig assembly had a total size of 584 Mb (96,738 contigs, N50 = 7.6 kb, with 0.4% of ambiguous nucleotides), representing 77.5% of the predicted genome size of 754 Mb. The P. nobilis genome is highly AT-rich, with a GC content of 35.6%. At 1%, heterozygosity was in the range of other bivalves with sequenced genomes. Over one-third (36.2%) of the genome consisted of repeated elements with a surprising larger number of short interspersed nuclear elements compared to other molluscan genomes. We were also able to reconstruct the full mitochondrial genome (c. 19 kb, with 12 protein-coding genes, 2 rRNA and 22 tRNA genes). In the context of the epizootic outbreak affecting P. nobilis, a first insight into the innate immune and stress-related genes found in the sequence is provided.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42177409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Manuela Carnaghi, G. Kindermann, I. Reich, Jerome Shehan, M. Gormally
{"title":"Tolerance to extreme hot and cold temperatures in the EU-protected terrestrial slug Geomalacus maculosus","authors":"Manuela Carnaghi, G. Kindermann, I. Reich, Jerome Shehan, M. Gormally","doi":"10.1093/MOLLUS/EYAB005","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAB005","url":null,"abstract":"","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/MOLLUS/EYAB005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47137448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The western Atlantic Ocean is one of the areas with the largest species richness of sea slugs in the genus Elysia (30 out of the 101 species described have been reported in this region). Nevertheless, the lack of knowledge on many of these species hinders efforts to estimate regional richness and identify the factors affecting their distribution. We used the maximum entropy algorithm Maxent to develop ecological niche models for 14 species of Elysia in the western Atlantic Ocean. These models were meant to show the potential distribution of the genus and identify locations with the highest richness. Input data used to build niche models were presence records (obtained from several sources) and bioclimatic and geophysical variables from the Bio-ORACLE and MARSPEC platforms. Species with less than seven records were considered for the calculation of richness, but not for modelling. Results show low habitat suitability for the species modelled here at the mouth of rivers and in hypoxic zones and low-temperature areas. The two variables that best explained species distribution patterns were the distance to shore and the maximum monthly temperature. From the total area with adequate environmental conditions for the genus, only 20.3% is located within marine areas under some protection category.
{"title":"Where is the genus Elysia in the western Atlantic? Potential distribution, species richness and representation in marine protected areas","authors":"L. M. Jiménez, N. Simões, Carlos Yáñez-Arenas","doi":"10.1093/MOLLUS/EYAB003","DOIUrl":"https://doi.org/10.1093/MOLLUS/EYAB003","url":null,"abstract":"\u0000 The western Atlantic Ocean is one of the areas with the largest species richness of sea slugs in the genus Elysia (30 out of the 101 species described have been reported in this region). Nevertheless, the lack of knowledge on many of these species hinders efforts to estimate regional richness and identify the factors affecting their distribution. We used the maximum entropy algorithm Maxent to develop ecological niche models for 14 species of Elysia in the western Atlantic Ocean. These models were meant to show the potential distribution of the genus and identify locations with the highest richness. Input data used to build niche models were presence records (obtained from several sources) and bioclimatic and geophysical variables from the Bio-ORACLE and MARSPEC platforms. Species with less than seven records were considered for the calculation of richness, but not for modelling. Results show low habitat suitability for the species modelled here at the mouth of rivers and in hypoxic zones and low-temperature areas. The two variables that best explained species distribution patterns were the distance to shore and the maximum monthly temperature. From the total area with adequate environmental conditions for the genus, only 20.3% is located within marine areas under some protection category.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2021-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/MOLLUS/EYAB003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46858169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：