{"title":"First record of bipedal locomotion in Callistoctopus furvus","authors":"Sydney L O'Brien, C. E. O'Brien","doi":"10.1093/mollus/eyac020","DOIUrl":"https://doi.org/10.1093/mollus/eyac020","url":null,"abstract":"","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44708208","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}
Alison Domínguez-Estrada, C. Galindo-Sánchez, Claudia Ventura-López, C. Rosas, Ó. Juárez
The octopus optic glands are the source of multiple signalling molecules that control the transitions through different physiological stages, such as maturation, ageing and death. This study focused on the role of the optic glands during the reproductive phase of Octopus maya, investigating the molecular mechanisms that prevent reproduction at elevated temperatures. RNA sequencing was used to analyse and compare optic gland transcriptomic profiles of female O. maya before, during and after egg-laying under optimal and thermal stress (elevated temperature) conditions. Each stage showed well-defined transcriptomic patterns, and all were strongly affected by thermal stress. At optimal temperature, the optic glands contribute importantly to regulating the energetic balance, as suggested by the expression of genes that modulate the metabolic rate, arterial blood pressure and the management of ATP sources in response to food deprivation. At elevated temperatures, the optic glands of mated females (before egg-laying) showed upregulation of genes encoding neuropeptides (FMRF-amide, APGW-amide, PRQFV-amide, FCAP, buccalin and myomodulin) and the dopamine beta-hydroxylase gene. During egg-laying at elevated temperatures, the neuropeptide receptor capaR and the sex peptide receptor were upregulated whereas homologs of fetuin-B and oviduct-specific glycoprotein genes, crucial for fertilization, were downregulated. These changes in optic gland gene expression in O. maya may be the basis for the high-temperature inhibition of egg-laying, previously observed from this octopus species. Furthermore, after egg-laying, during egg incubation thermal stress affected the expression of genes involved in steroid and thyroid hormone biosynthesis and in inflammatory and apoptotic pathways.
{"title":"Response of optic gland pathways to thermal stress in the reproductive phase of female Octopus maya","authors":"Alison Domínguez-Estrada, C. Galindo-Sánchez, Claudia Ventura-López, C. Rosas, Ó. Juárez","doi":"10.1093/mollus/eyac018","DOIUrl":"https://doi.org/10.1093/mollus/eyac018","url":null,"abstract":"\u0000 The octopus optic glands are the source of multiple signalling molecules that control the transitions through different physiological stages, such as maturation, ageing and death. This study focused on the role of the optic glands during the reproductive phase of Octopus maya, investigating the molecular mechanisms that prevent reproduction at elevated temperatures. RNA sequencing was used to analyse and compare optic gland transcriptomic profiles of female O. maya before, during and after egg-laying under optimal and thermal stress (elevated temperature) conditions. Each stage showed well-defined transcriptomic patterns, and all were strongly affected by thermal stress. At optimal temperature, the optic glands contribute importantly to regulating the energetic balance, as suggested by the expression of genes that modulate the metabolic rate, arterial blood pressure and the management of ATP sources in response to food deprivation. At elevated temperatures, the optic glands of mated females (before egg-laying) showed upregulation of genes encoding neuropeptides (FMRF-amide, APGW-amide, PRQFV-amide, FCAP, buccalin and myomodulin) and the dopamine beta-hydroxylase gene. During egg-laying at elevated temperatures, the neuropeptide receptor capaR and the sex peptide receptor were upregulated whereas homologs of fetuin-B and oviduct-specific glycoprotein genes, crucial for fertilization, were downregulated. These changes in optic gland gene expression in O. maya may be the basis for the high-temperature inhibition of egg-laying, previously observed from this octopus species. Furthermore, after egg-laying, during egg incubation thermal stress affected the expression of genes involved in steroid and thyroid hormone biosynthesis and in inflammatory and apoptotic pathways.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42029294","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}
D. Doyle, J. Frias, M. Gammell, Michael Lynch, R. Nash
Size-selective harvesting of intertidal molluscs is a common practice. However, the effects of long-term traditional harvesting remain unclear. Changes in mean shell size are generally taken as evidence of changes in harvesting intensity. However, mean shell size is also influenced by environmental pressures, which may confound the analysis of size variation over time. In this study, we apply geometric morphometrics to historical data from two shell middens, in an attempt to classify Littorina littorea shells to their environmental origins, prior to carrying out shell size analysis. Using this method, shell shape was found to be consistent within and between the midden sites. Based on comparison with modern populations from shores of known wave exposure, the midden shells were found to be more consistent with sheltered shores, and to differ most from the very exposed shore sites, the latter of which are located adjacent to the midden remains. The mean shell size was significantly smaller in the more recent midden site. We hypothesize this reduction is caused by an increase in harvesting intensity over this period. It is also possible, given the very slight reduction in shell size, coupled with certain life-history traits of L. littorea, that the change in shell size was caused by slight differences in environmental conditions. The use of midden shells and morphometrics has the potential to provide an insight into previous environmental conditions and past harvesting practices, which may be used to inform current harvesting practices.
{"title":"Assessing the morphological impacts of long-term harvesting in intertidal gastropods using historical data and morphometric tools","authors":"D. Doyle, J. Frias, M. Gammell, Michael Lynch, R. Nash","doi":"10.1093/mollus/eyac019","DOIUrl":"https://doi.org/10.1093/mollus/eyac019","url":null,"abstract":"\u0000 Size-selective harvesting of intertidal molluscs is a common practice. However, the effects of long-term traditional harvesting remain unclear. Changes in mean shell size are generally taken as evidence of changes in harvesting intensity. However, mean shell size is also influenced by environmental pressures, which may confound the analysis of size variation over time. In this study, we apply geometric morphometrics to historical data from two shell middens, in an attempt to classify Littorina littorea shells to their environmental origins, prior to carrying out shell size analysis. Using this method, shell shape was found to be consistent within and between the midden sites. Based on comparison with modern populations from shores of known wave exposure, the midden shells were found to be more consistent with sheltered shores, and to differ most from the very exposed shore sites, the latter of which are located adjacent to the midden remains. The mean shell size was significantly smaller in the more recent midden site. We hypothesize this reduction is caused by an increase in harvesting intensity over this period. It is also possible, given the very slight reduction in shell size, coupled with certain life-history traits of L. littorea, that the change in shell size was caused by slight differences in environmental conditions. The use of midden shells and morphometrics has the potential to provide an insight into previous environmental conditions and past harvesting practices, which may be used to inform current harvesting practices.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48565840","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}
Jina Park, Yucheol Lee, Taeho Kim, E. Kern, Hyun-Jong Kil, D. Eernisse, H. Saito, Joong-Ki Park
The chiton genus Cryptoplax is widely distributed in the Indo-Pacific, extending to southern Australia and the northwestern Pacific (NWP), with 17 recognized species. Among these species, Cryptoplax japonica is commonly found on rocky intertidal and subtidal substrates in the NWP, whereas another species, C. propior, is rarely seen because of its cryptic subtidal habitat and limited distribution. In this study, we surveyed the genetic diversity of C. japonica populations based on 93 individuals from 24 sampling sites along the Korean and Japanese coastlines, including the type locality, using DNA sequences of the mitochondrial gene cytochrome c oxidase subunit I (COI). Haplotype network and phylogenetic analyses of COI sequences revealed two highly divergent genetic lineages of C. japonica separated by a large pairwise genetic distance (10.62%), which was comparable to the genetic difference when either of these two lineages (A or B) is compared with the co-occurring C. propior. In addition to COI sequences, average sequence divergence in 16S rDNA between these three lineages ranged from 2.0 to 3.3%. In contrast to this deep sequence divergence, both morphological examination of radula, girdle and articulamentum colouring, and morphometric analyses of shell measurements using principal component analysis and linear discriminant analysis revealed no diagnostic differences between the two C. japonica lineages. The co-occurrence of these two divergent lineages within most of our studied area, with no morphological differences, indicates cryptic divergence. More extensive sampling from the entire distributional ranges of these cryptic species, in combination with the use of additional molecular markers could shed light on the mechanisms underlying their divergence.
{"title":"Molecular survey of Cryptoplax japonica (Polyplacophora: Cryptoplacidae) reveals cryptic lineages in the northwestern Pacific","authors":"Jina Park, Yucheol Lee, Taeho Kim, E. Kern, Hyun-Jong Kil, D. Eernisse, H. Saito, Joong-Ki Park","doi":"10.1093/mollus/eyac016","DOIUrl":"https://doi.org/10.1093/mollus/eyac016","url":null,"abstract":"\u0000 The chiton genus Cryptoplax is widely distributed in the Indo-Pacific, extending to southern Australia and the northwestern Pacific (NWP), with 17 recognized species. Among these species, Cryptoplax japonica is commonly found on rocky intertidal and subtidal substrates in the NWP, whereas another species, C. propior, is rarely seen because of its cryptic subtidal habitat and limited distribution. In this study, we surveyed the genetic diversity of C. japonica populations based on 93 individuals from 24 sampling sites along the Korean and Japanese coastlines, including the type locality, using DNA sequences of the mitochondrial gene cytochrome c oxidase subunit I (COI). Haplotype network and phylogenetic analyses of COI sequences revealed two highly divergent genetic lineages of C. japonica separated by a large pairwise genetic distance (10.62%), which was comparable to the genetic difference when either of these two lineages (A or B) is compared with the co-occurring C. propior. In addition to COI sequences, average sequence divergence in 16S rDNA between these three lineages ranged from 2.0 to 3.3%. In contrast to this deep sequence divergence, both morphological examination of radula, girdle and articulamentum colouring, and morphometric analyses of shell measurements using principal component analysis and linear discriminant analysis revealed no diagnostic differences between the two C. japonica lineages. The co-occurrence of these two divergent lineages within most of our studied area, with no morphological differences, indicates cryptic divergence. More extensive sampling from the entire distributional ranges of these cryptic species, in combination with the use of additional molecular markers could shed light on the mechanisms underlying their divergence.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47507229","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":"Predatory suspension feeders: an unusual feeding mode switch in Olivella columellaris (Caenogastropoda: Olividae) and its possible ecological effects","authors":"W. Peters, G. Pastorino, D. Fiege","doi":"10.1093/mollus/eyac017","DOIUrl":"https://doi.org/10.1093/mollus/eyac017","url":null,"abstract":"","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41712472","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}
Molecular phylogenetics revolutionized the systematics of the megadiverse ‘hydrobioid’ gastropods (i.e. Hydrobiidae sensu lato Davis, 1979) by showing them to be a polyphyletic group within the superfamilies Rissooidea Gray, 1847 and Truncatelloidea Gray, 1840 (Wilke et al. , 2001; Criscione & 2013). Wilke et al. (2013) revealed extensive morphological homoplasy in the hydrobioids and emphasized the need to use molecular data for higher- level classification. This facilitated numerous taxonomic revisions, most of which serve as the current basis of freshwater rissooidean and truncatelloidean taxonomy (Bouchet et al. , 2017; MolluscaBase, 2021a, b). Molecular data have also been integral to recent species descriptions and population-level analyses of hydrobioids (Wilke & Davis, 2000; Haase, 2008; Delicado, Machordom & Ramos, 2012; Osikowski et al. , 2017). However, newly available sequence data have not been synthesized to clarify the still uncertain family-level systematics of some hydrobioids. One such unresolved taxon is the subfamily Fontigentinae which consists only of the Fontigens Pilsbry,
分子系统发育学彻底改变了巨大多样性的“水生”腹足类的系统学（即Hydrobiidae sensu lato Davis，1979），表明它们是Rissooeidea Gray超科1847和Truncatelloeidea Grey超科1840中的一个多系群（Wilke et al.，2001；Criscione和2013）。Wilke等人（2013）揭示了水生生物中广泛的形态学同源性，并强调需要使用分子数据进行更高水平的分类。这促进了许多分类学的修订，其中大多数是淡水rissooidean和truncateloidean分类学的当前基础（Bouchet et al.，2017；软体动物数据库，2021a，b）。分子数据也是最近水生生物的物种描述和种群水平分析的组成部分（Wilke&Davis，2000；Haase，2008；Delicado、Machordom&Ramos，2012；Osikowski等人，2017）。然而，新获得的序列数据还没有被合成，以阐明一些水生生物的科级系统学仍然不确定。其中一个尚未解决的分类单元是Fontigentinae亚科，它只由Fontigens Pilsbry组成，
{"title":"Corrigendum to \"Pushing barcodes to their limits: phylogenetic placement of Fontigens Pilsbry, 1933 (Caenogastropoda: Littorinimorpha: Truncatelloidea) and elevation of Fontigentidae Taylor, 1966","authors":"Nicholas S. Gladstone, Nathan V. Whelan","doi":"10.1093/mollus/eyac003","DOIUrl":"https://doi.org/10.1093/mollus/eyac003","url":null,"abstract":"Molecular phylogenetics revolutionized the systematics of the megadiverse ‘hydrobioid’ gastropods (i.e. Hydrobiidae sensu lato Davis, 1979) by showing them to be a polyphyletic group within the superfamilies Rissooidea Gray, 1847 and Truncatelloidea Gray, 1840 (Wilke et al. , 2001; Criscione & 2013). Wilke et al. (2013) revealed extensive morphological homoplasy in the hydrobioids and emphasized the need to use molecular data for higher- level classification. This facilitated numerous taxonomic revisions, most of which serve as the current basis of freshwater rissooidean and truncatelloidean taxonomy (Bouchet et al. , 2017; MolluscaBase, 2021a, b). Molecular data have also been integral to recent species descriptions and population-level analyses of hydrobioids (Wilke & Davis, 2000; Haase, 2008; Delicado, Machordom & Ramos, 2012; Osikowski et al. , 2017). However, newly available sequence data have not been synthesized to clarify the still uncertain family-level systematics of some hydrobioids. One such unresolved taxon is the subfamily Fontigentinae which consists only of the Fontigens Pilsbry,","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44138900","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}
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