Journal of Molluscan Studies最新文献_第3页

Mating roles, copulation duration and reproductive output in the hermaphroditic freshwater snail Planorbella trivolvis 雌雄同体淡水蜗牛 Planorbella trivolvis 的交配角色、交配持续时间和生殖产量

IF 1.2 4区生物学

Journal of Molluscan Studies Pub Date : 2024-01-27 DOI: 10.1093/mollus/eyad026

Cynthia G Norton

{"title":"Mating roles, copulation duration and reproductive output in the hermaphroditic freshwater snail Planorbella trivolvis","authors":"Cynthia G Norton","doi":"10.1093/mollus/eyad026","DOIUrl":"https://doi.org/10.1093/mollus/eyad026","url":null,"abstract":"Hermaphrodites exhibit a wide variety of reproductive strategies, yet empirical studies lag behind theories about their evolution. Planorbella trivolvis, a simultaneous hermaphrodite capable of reciprocal copulation and rare self-fertilization, provides a unique model system for studying reproduction. This study assessed sex roles during mating, demonstrating that mating is primarily reciprocal, and investigated the relationship between physical coupling and reproductive output for single copulation events. Snails were isolated before sexual maturity and placed in 10-l aquaria in size-matched groups. Upon copulation, pairs were removed to small cups until they separated; they were then kept isolated and eggs counted until egg production ceased. The frequency of reciprocal copulation (both members of a pair produced egg masses following copulation) was 95% (35/37 productive matings), higher than previously reported. The duration of egg production ranged from 19 to 197 days (mean ± SE = 110.13 ± 6.3 days) with a sharp drop in production of egg masses and eggs per mass occurring between 15 and 20 weeks postmating, consistent with previous estimates of sperm storage. There was no relationship between mating duration and total egg production (a biomarker of sperm availability) or the duration of egg production (a marker of sperm longevity). Further investigation is needed to directly estimate sperm transfer and tease apart the duration of reciprocal physical contact from gamete and accessory protein transfer.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139583252","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}

引用次数: 0

Ontogenetic variability in the diel activity pattern of the marine gastropod Cassis cornuta (Mollusca: Cassidae) 海洋腹足动物 Cassis cornuta（软体动物门：Cassidae）昼夜活动模式的个体发育变异性

IF 1.2 4区生物学

Journal of Molluscan Studies Pub Date : 2024-01-25 DOI: 10.1093/mollus/eyad024

Lala Grace Calle, Patrick C Cabaitan, Sherry Lyn G Sayco, Shau Hwai Tan, Cecilia Conaco

{"title":"Ontogenetic variability in the diel activity pattern of the marine gastropod Cassis cornuta (Mollusca: Cassidae)","authors":"Lala Grace Calle, Patrick C Cabaitan, Sherry Lyn G Sayco, Shau Hwai Tan, Cecilia Conaco","doi":"10.1093/mollus/eyad024","DOIUrl":"https://doi.org/10.1093/mollus/eyad024","url":null,"abstract":"Examining activity patterns is essential in understanding gastropod feeding and movement ecology. However, the diel activity patterns of large-bodied gastropods, such as Cassis cornuta, remain poorly studied. Here, we conducted outdoor hatchery-based experiments to examine the diel activity patterns of C. cornuta adults and juveniles under natural sunlight and photoperiod. Activities of C. cornuta, such as crawling, hunting, feeding, burrowing and resting on the substratum, were examined every hour for 3 days. Although most individuals were inactive for a greater part of the observation period, active behaviours were recorded for some individuals during both daytime and nighttime, suggesting that C. cornuta is cathemeral, as supported by a nonsignificant result from a Rayleigh's test of uniformity. A higher proportion of adult and juvenile C. cornuta were inactive, either burrowed or resting on the substratum, during the 24-h period. Peak activity time for juveniles started at 20:00, with up to 50% of individuals active, while peak activity time for adults started at 21:00, with up to 20% of active individuals. Adults spent more time resting aboveground, whereas juveniles spent more time burrowed under the sand when not feeding. Juveniles hunted more frequently and spent more time feeding compared to adults. Additionally, juveniles crawled faster and were more successful in capturing sea urchins than adults. The information on variability in the diel activity patterns and movement rates between adult and juvenile C. cornuta would allow further demographic studies, and provide insights into possible conservation strategies for this species.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139583256","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}

引用次数: 0

The hollow newel state in gastropods: when snail shells are open-axis 腹足纲动物的空心楔形状态：当蜗牛壳是开轴的时候

IF 1.2 4区生物学

Journal of Molluscan Studies Pub Date : 2024-01-13 DOI: 10.1093/mollus/eyae001

Dana S Friend, Brendan M. Anderson, Warren D. Allmon

引用次数: 0

Geographic differences in the diet and isotopic niche of Octopus hubbsorum (Cephalopoda: Octopodidae) in the Mexican Pacific 墨西哥太平洋hubbsorum章鱼(头足纲:章鱼科)食性和同位素生态位的地理差异

IF 1.2 4区生物学

Journal of Molluscan Studies Pub Date : 2023-11-28 DOI: 10.1093/mollus/eyad021

Alejandra Mazariegos-Villarreal, Andrea Grissel Chávez-Pillado, Karla León-Cisneros, Jasmín Granados-Amores, Tatiana A Acosta-Pachón, Marco Antonio Medina-López, Elisa Serviere-Zaragoza

{"title":"Geographic differences in the diet and isotopic niche of Octopus hubbsorum (Cephalopoda: Octopodidae) in the Mexican Pacific","authors":"Alejandra Mazariegos-Villarreal, Andrea Grissel Chávez-Pillado, Karla León-Cisneros, Jasmín Granados-Amores, Tatiana A Acosta-Pachón, Marco Antonio Medina-López, Elisa Serviere-Zaragoza","doi":"10.1093/mollus/eyad021","DOIUrl":"https://doi.org/10.1093/mollus/eyad021","url":null,"abstract":"Octopus hubbsorum is an important fisheries resource in the Mexican Pacific and a link among different trophic levels due to its ecological role as both predator and prey. In this study, the spatial variations in the diet, isotopic niche and trophic position of O. hubbsorum were determined by analysing digestive contents along with carbon and nitrogen stable isotopes. Octopuses were sampled from four locations, three in the Gulf of California ecoregion and one in the Mexican Pacific transition ecoregion. The diet of O. hubbsorum consisted of 11 major taxonomic groups. Crustaceans were the most important prey, although some individuals consumed high proportions of polychaetes, eggs and cephalopods. The stable isotope values showed high variation (−15.86 to −13.76‰ δ13C; 14.80–17.23‰ δ15N), reflecting signals of the base of the food web at the four locations. Differences in trophic positions and isotopic niches confirm the role of this species as a generalist predator, as it can shift among alternate food sources according to local availability. Overall, our results suggest that O. hubbsorum has a similar ecological role at all locations as a predator of crustaceans and, to a lesser extent, of molluscs and fish.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528848","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}

引用次数: 0

Shedding light on a species complex within the genus Goniodoridella Pruvot-Fol, 1933 (Nudibranchia: Goniodorididae), with the description of three new species 揭示了1933年goniooridella Pruvot-Fol属的一个物种复群(裸鳃亚目:gonioorididae)，并描述了三个新种

IF 1.2 4区生物学

Journal of Molluscan Studies Pub Date : 2023-11-16 DOI: 10.1093/mollus/eyad020

Sofía Paz-Sedano, Irina Ekimova, Dimitri Smirnoff, Terrence M Gosliner, Marta Pola

{"title":"Shedding light on a species complex within the genus Goniodoridella Pruvot-Fol, 1933 (Nudibranchia: Goniodorididae), with the description of three new species","authors":"Sofía Paz-Sedano, Irina Ekimova, Dimitri Smirnoff, Terrence M Gosliner, Marta Pola","doi":"10.1093/mollus/eyad020","DOIUrl":"https://doi.org/10.1093/mollus/eyad020","url":null,"abstract":"Goniodoridella Pruvot-Fol, 1933 is a genus of small nudibranchs found in the Indo-Pacific Ocean. Currently, the genus includes only two described species, the widely distributed type species Goniodoridella savignyi Pruvot-Fol, 1933 and G. borealis Martynov, Sanamyan & Korshunova, 2015, which is found in the northern Sea of Japan. However, because of the presence of a group of cryptic species, the known geographic range of G. savignyi may have been overestimated, while the species richness of the genus may be underestimated. In the current study, we examined specimens from Australia, the Philippines and Russia that were identified as G. savignyi, G. borealis and an undescribed species. Detailed analyses of the external morphology and internal anatomy of the specimens were carried out, as well as scanning electron micrography of the radula and the labial cuticle. Photographs of the penial spines were taken under a light microscope. DNA sequence data for selected mitochondrial and nuclear markers were obtained, allowing the inclusion of the genus Goniodoridella in molecular phylogenetic analyses for the first time. Our results support the monophyly of the genus Goniodoridella and confirm the existence of a species complex of which the type is G. savignyi. The new species G. geminae n. sp., G. serrata n. sp. and G. unidonta n. sp. are described.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528872","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}

引用次数: 0

Genetic analysis is compatible with recent human-mediated range expansion of Filopaludina from India into the Mesopotamian Plain 遗传分析与最近人类介导的Filopaludina从印度到美索不达米亚平原的范围扩张是相容的

4区生物学

Journal of Molluscan Studies Pub Date : 2023-10-03 DOI: 10.1093/mollus/eyad019

Björn Stelbrink, Hanan Zwair, Ali Abdulhamza Al-Fanharawi, Thomas von Rintelen

引用次数: 0

Did Captain Beechey see a living Mandarina luhuana, an extinct land snail species? 比奇船长看到活的陆生蜗牛了吗，一种已经灭绝的陆地蜗牛?

4区生物学

Journal of Molluscan Studies Pub Date : 2023-10-03 DOI: 10.1093/mollus/eyad018

Satoshi Chiba

{"title":"Did Captain Beechey see a living <i>Mandarina luhuana</i>, an extinct land snail species?","authors":"Satoshi Chiba","doi":"10.1093/mollus/eyad018","DOIUrl":"https://doi.org/10.1093/mollus/eyad018","url":null,"abstract":"ABSTRACT Knowledge about prehuman biotas and the impact of early human contact, particularly on land snails inhabiting oceanic islands, is still poor. One specific example of interest is Mandarina luhuana, which was first collected from the Chichijima Islands of the Ogasawara Archipelago in 1827 during Captain Frederick William Beechey's expedition. The initial description of M. luhuana included an image of a shell with dark brown pigmentation, which contrasts with current understanding, with all known specimens being considered to lack dark colouration. Traditionally, it is believed that M. luhuana represents a fossil species that became extinct on the island before human arrival. However, I propose that the specimen collected for the original description was either recently dead or still alive at the time of collection. Furthermore, I hypothesize that M. luhuana faced extinction after human arrival on Ogasawara, which began during the 17th century. To test this hypothesis, I used accelerator mass spectrometry dating to determine the extinction dates of subfossil samples of M. luhuana. The results of this study suggest that M. luhuana became extinct after the 17th century, with the species having possibly survived until the early 19th century. It is likely that the extinction of M. luhuana occurred shortly after human arrival in the islands. These findings underscore the need for further research to understand the impact of human arrival on island ecosystems and to uncover the original diversity of land snail faunas on islands.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135695436","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}

引用次数: 0

Molecular phylogeny and biogeography of the living Pleurotomariidae (Vetigastropoda), with the description of a new genus 现存拟腹足动物科的分子系统发育与生物地理学，并附一新属的描述

IF 1.2 4区生物学

Journal of Molluscan Studies Pub Date : 2023-09-25 DOI: 10.1093/mollus/eyad016

M G Harasewych, Patrick Anseeuw, Dario Zuccon, Nicolas Puillandre

引用次数: 0

A phylogeographic assessment redefines the distributions of Truncilla species (Bivalvia: Unionidae) in Texas 一种系统地理学评估重新定义了在德克萨斯州的截尾属(双壳亚目:联叶科)的分布

IF 1.2 4区生物学

Journal of Molluscan Studies Pub Date : 2023-08-29 DOI: 10.1093/mollus/eyad015

Rachel Saxon, Charles R Randklev, Kevin J Roe, Clinton R Robertson, Chase H Smith

{"title":"A phylogeographic assessment redefines the distributions of Truncilla species (Bivalvia: Unionidae) in Texas","authors":"Rachel Saxon, Charles R Randklev, Kevin J Roe, Clinton R Robertson, Chase H Smith","doi":"10.1093/mollus/eyad015","DOIUrl":"https://doi.org/10.1093/mollus/eyad015","url":null,"abstract":"Truncilla macrodon¸ the Texas Fawnsfoot, is currently considered to be restricted to the Brazos and Colorado river drainages in central Texas, USA. Subfossil specimens resembling T. macrodon from shell middens in the Trinity river drainage have raised questions about its presumptive range. Extant Truncilla populations occupying the Trinity river drainage are believed to be Truncilla donaciformis, the Fawnsfoot, but the species identity has not been assessed using molecular techniques. In this study, we set out to use phylogeographic and morphometric approaches to resolve the distribution of Truncilla spp. in Texas, with an emphasis on assessing species identity of Truncilla in the Trinity river drainage. Our molecular analyses indicated individuals from the Trinity river drainage are T. macrodon rather than T. donaciformis, and morphometric analyses using ratios of shell length, width and height supports this finding and showed differentiation among T. macrodon, Truncilla cognata and T. donaciformis. These combined findings suggest the range of T. macrodon is larger than previously recognized and includes the Colorado, Brazos and Trinity river drainages. The status of Truncilla spp. in the San Jacinto river basin remains unclear due to lack of information on historical or extant populations, but we recommend conservationists consider T. macrodon as part of the mussel fauna since the drainage shares an embayment with the Trinity river drainage. Molecular data also indicated the Trinity population of T. macrodon is distinct from, and more genetically diverse than, the Brazos and Colorado populations. This difference suggests the Trinity River population should be treated as a separate management unit from the Brazos and Colorado River populations to facilitate effective conservation and recovery planning. Our study adds to the growing body of literature highlighting the utility of molecular data in conservation and management of freshwater mussels.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138528855","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}

引用次数: 0

The protobranch Aequiyoldia eightsii (Jay, 1839) (Nuculanida: Sareptidae) reveals uncommon siphonal anatomy among bivalves 原分支Aequiyoldia eightsii (Jay, 1839) (Nuculanida: Sareptidae)揭示了双壳类中罕见的虹吸解剖

IF 1.2 4区生物学

Journal of Molluscan Studies Pub Date : 2023-07-04 DOI: 10.1093/mollus/eyad014

A. R. Batistão, J. A. Audino, F. Passos

{"title":"The protobranch Aequiyoldia eightsii (Jay, 1839) (Nuculanida: Sareptidae) reveals uncommon siphonal anatomy among bivalves","authors":"A. R. Batistão, J. A. Audino, F. Passos","doi":"10.1093/mollus/eyad014","DOIUrl":"https://doi.org/10.1093/mollus/eyad014","url":null,"abstract":"\u0000 Siphons represent a remarkable example of evolutionary convergence in different bivalve lineages. In Protobranchia, the siphons, when present, are used exclusively to channel the water currents used for respiration, waste removal and gamete release. Their emergence is thought to be associated with the taxonomic and morphological diversification within the Nuculanida. While siphons have been extensively studied in other bivalve groups, particularly the Heterodonta, gaps remain in the knowledge of protobranch siphons, especially on their morphology, including the musculature and innervation, and their functioning. The few data on Protobranchia siphons are restricted to some Nuculanoidea, and information is still missing for other nuculanid lineages, such as the Sareptoidea. The present study provides a description of the siphonal morphology of Aequiyoldia eightsii, a sareptid bivalve. Histological data were obtained to investigate their organization and infer their functioning. All traits observed were compared with those of heterodont siphons. In A. eightsii, the siphons are fused with each other and distinguished by their reduced longitudinal musculature in bundles that do not form layers, by the presence of a blood lacunal system that fills most of the wall of the siphon and by the innervation that is likely diffuse. This suggests that the siphons are hydrostatic organs with a hydraulic mechanism whose expansion occurs when the lacunar system is filled with blood. Our results provide the first morphological and functional details of a protobranch siphon and thus contribute to knowledge on the comparative anatomy of Bivalvia.","PeriodicalId":50126,"journal":{"name":"Journal of Molluscan Studies","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44168694","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}

引用次数: 0