Pub Date : 2022-06-28DOI: 10.1080/13235818.2022.2091405
W. Sleurs
ABSTRACT A new species Rissoina ponderi n. sp., so far only collected from the coast of New South Wales, is described and contrasted with its morphologically most similar species R. elegantula Angas, 1880. The species differ in larval development and in geographical distribution pattern. The hypotheses of sister species and poecilogony are discussed. http://zoobank.org/urn:lsid:zoobank.org:pub:CEBAE295-444C-4383-99B6-07120BEC729D
{"title":"Rissoina ponderi n. sp. (Caenogastropoda: Rissoinidae) a new endemic species from New South Wales and a comparison with the related species Rissoina elegantula Angas, 1880","authors":"W. Sleurs","doi":"10.1080/13235818.2022.2091405","DOIUrl":"https://doi.org/10.1080/13235818.2022.2091405","url":null,"abstract":"ABSTRACT A new species Rissoina ponderi n. sp., so far only collected from the coast of New South Wales, is described and contrasted with its morphologically most similar species R. elegantula Angas, 1880. The species differ in larval development and in geographical distribution pattern. The hypotheses of sister species and poecilogony are discussed. http://zoobank.org/urn:lsid:zoobank.org:pub:CEBAE295-444C-4383-99B6-07120BEC729D","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49096087","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}
Pub Date : 2022-06-17DOI: 10.1080/13235818.2022.2087143
Tristan Joseph Verhoeff
ABSTRACT The finned octopus Cirroteuthis muelleri is abundant in the far northern hemisphere, yet limited records exist of a possible undescribed southern hemisphere species, Cirroteuthis cf. muelleri. A single specimen of C. cf. muelleri was identified amongst material collected during a 2017 abyssal survey off eastern Australia. The specimen had a dorsal mantle length of about 116 mm when fresh and 56 mm following preservation and was captured at 2338−2581 m depth. Morphological characteristics of this specimen aligned closely with C. cf. muelleri from New Zealand, and differences in these to C. muelleri from the North Atlantic and North Pacific, combined with the disjunct distribution, warrant further investigation of the southern hemisphere specimens as a possible new species. This discovery represents a significant range extension of Cirroteuthis and is the first occurrence of this genus from Australian waters.
有鳍章鱼(Cirroteuthis muelleri)在遥远的北半球非常丰富，但在南半球有一种可能未被描述的物种(Cirroteuthis cf. muelleri)的记录有限。2017年，在澳大利亚东部海域进行的一次深海调查中，在收集的材料中发现了一个c.c.m ulelleri标本。该标本在新鲜时的背地幔长度约为116毫米，保存后的背地幔长度约为56毫米，捕获深度为2338 - 2581米。该标本的形态特征与来自新西兰的C. C. muelleri非常接近，与来自北大西洋和北太平洋的C. muelleri的差异，结合其不相交的分布，值得进一步研究南半球标本作为新种的可能性。这一发现代表了Cirroteuthis的重要范围扩展，并且是该属首次在澳大利亚水域出现。
{"title":"Finned octopus Cirroteuthis Eschricht, 1836 (Cephalopoda: Cirrata: Cirroteuthidae) confirmed from Australian waters","authors":"Tristan Joseph Verhoeff","doi":"10.1080/13235818.2022.2087143","DOIUrl":"https://doi.org/10.1080/13235818.2022.2087143","url":null,"abstract":"ABSTRACT The finned octopus Cirroteuthis muelleri is abundant in the far northern hemisphere, yet limited records exist of a possible undescribed southern hemisphere species, Cirroteuthis cf. muelleri. A single specimen of C. cf. muelleri was identified amongst material collected during a 2017 abyssal survey off eastern Australia. The specimen had a dorsal mantle length of about 116 mm when fresh and 56 mm following preservation and was captured at 2338−2581 m depth. Morphological characteristics of this specimen aligned closely with C. cf. muelleri from New Zealand, and differences in these to C. muelleri from the North Atlantic and North Pacific, combined with the disjunct distribution, warrant further investigation of the southern hemisphere specimens as a possible new species. This discovery represents a significant range extension of Cirroteuthis and is the first occurrence of this genus from Australian waters.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46473693","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}
ABSTRACT The false mussel Mytilopsis sallei (Récluz, 1849) is a bivalve indigenous to the tropical western Atlantic that has become invasive in Southeast-Asia. Establishment of M. sallei populations in Thailand was reported in 2008 and it has spread to several locations along both the Gulf of Thailand and Andaman Sea coasts. The survival of planktonic larvae of M. sallei in oceanic salinity is known to be poor so these populations may be a result of multiple introductions, and propagule exchanges between populations may be limited. To test this, we investigated the variability of cytochrome oxidase subunit I in M. sallei within and between spatially isolated locations, as well as between the Gulf of Thailand and Andaman Sea coasts. In total, 407 base pairs from 60 individuals across five locations were analysed. Differences in the genetic structure of M. sallei among the five populations from southern Thailand suggest that there is no connectivity between the Gulf of Thailand and Andaman Sea populations. The results revealed the presence of six of the 15 haplotypes known among Southeast-Asian populations of M. sallei. This study contributes to the understanding of population genetic structure of the non-native false mussel, M. sallei, in Southeast-Asia.
{"title":"The first evidence for genetic differentiation of a non-native false mussel Mytilopsis sallei (Récluz, 1849) in southern Thailand.","authors":"Wanlada Klangnurak, Suphatsara Sangphueak, Kringpaka Wangkulangkul","doi":"10.1080/13235818.2022.2073191","DOIUrl":"https://doi.org/10.1080/13235818.2022.2073191","url":null,"abstract":"ABSTRACT The false mussel Mytilopsis sallei (Récluz, 1849) is a bivalve indigenous to the tropical western Atlantic that has become invasive in Southeast-Asia. Establishment of M. sallei populations in Thailand was reported in 2008 and it has spread to several locations along both the Gulf of Thailand and Andaman Sea coasts. The survival of planktonic larvae of M. sallei in oceanic salinity is known to be poor so these populations may be a result of multiple introductions, and propagule exchanges between populations may be limited. To test this, we investigated the variability of cytochrome oxidase subunit I in M. sallei within and between spatially isolated locations, as well as between the Gulf of Thailand and Andaman Sea coasts. In total, 407 base pairs from 60 individuals across five locations were analysed. Differences in the genetic structure of M. sallei among the five populations from southern Thailand suggest that there is no connectivity between the Gulf of Thailand and Andaman Sea populations. The results revealed the presence of six of the 15 haplotypes known among Southeast-Asian populations of M. sallei. This study contributes to the understanding of population genetic structure of the non-native false mussel, M. sallei, in Southeast-Asia.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45421917","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}
Pub Date : 2022-04-03DOI: 10.1080/13235818.2022.2064043
M. Luo, B. Zhao, Jiaen Zhang, Z. Qin
ABSTRACT Pomacea canaliculata is listed among the world’s 100 worst invasive species, for threatening rice production and wetland biodiversity. We compared morphological and genetic characteristics of the 14 P. canaliculata geographic populations in mainland China to explore morphological differentiation in relation to geographical isolation and climate effects. The results showed that the average shell height, standing height and body width of P. canaliculata samples were 29.39, 18.52 and 19.91 mm. Morphological characteristics were significantly different among the P. canaliculata geographic populations. The changes in morphological characteristics fitted a linear model. Geometric measurement showed a significant difference in centroid size among the 14 populations. Canonical variates analysis revealed three distinct clusters and that four geographic populations were independent in shell shape variation. Mahalanobis distances showed significant relationships among all populations except Pingtang vs. Zhangzhou. The cumulative contribution of PC1, PC2 and PC3 in principal component analysis reached 80%. The overall identification accuracy was 97%. However, only 3.9% of pairwise Coefficient of Difference values exceeded 1.28. The difference in morphological traits did not conform to the isolation-by-distance model. The P. canaliculata phenotype was closely related to local climatic factors. In summary, the adaptation of Chinese P. canaliculata populations is ongoing.
{"title":"Phenotypic plasticity of the invasive apple snail, Pomacea canaliculata, in China: a morphological differentiation analysis","authors":"M. Luo, B. Zhao, Jiaen Zhang, Z. Qin","doi":"10.1080/13235818.2022.2064043","DOIUrl":"https://doi.org/10.1080/13235818.2022.2064043","url":null,"abstract":"ABSTRACT Pomacea canaliculata is listed among the world’s 100 worst invasive species, for threatening rice production and wetland biodiversity. We compared morphological and genetic characteristics of the 14 P. canaliculata geographic populations in mainland China to explore morphological differentiation in relation to geographical isolation and climate effects. The results showed that the average shell height, standing height and body width of P. canaliculata samples were 29.39, 18.52 and 19.91 mm. Morphological characteristics were significantly different among the P. canaliculata geographic populations. The changes in morphological characteristics fitted a linear model. Geometric measurement showed a significant difference in centroid size among the 14 populations. Canonical variates analysis revealed three distinct clusters and that four geographic populations were independent in shell shape variation. Mahalanobis distances showed significant relationships among all populations except Pingtang vs. Zhangzhou. The cumulative contribution of PC1, PC2 and PC3 in principal component analysis reached 80%. The overall identification accuracy was 97%. However, only 3.9% of pairwise Coefficient of Difference values exceeded 1.28. The difference in morphological traits did not conform to the isolation-by-distance model. The P. canaliculata phenotype was closely related to local climatic factors. In summary, the adaptation of Chinese P. canaliculata populations is ongoing.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41616674","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}
Pub Date : 2022-04-03DOI: 10.1080/13235818.2022.2066454
K. Kimura, S. Chiba, L. Prozorova, J. Pak
ABSTRACT Ullung Island is an oceanic island in the Sea of Japan about 130 km distant from the Korean peninsula. The biota of this oceanic island is thought to be derived from the closest continental region while the importance of long-distance dispersal from other areas for the formation of the Ullung Island biota was considered negligible. In this study, we have examined the origin of the Ullung Island-endemic land snail Karaftohelix adamsi (Kuroda & Hukuda, 1944) using a molecular phylogenetic approach with two mitochondrial (COI and 16S rRNA) and nuclear (ITS regions) DNA sequences. Our results revealed that K. adamsi has originated from the northernmost region of the Japanese archipelago or Sakhalin Island, most likely from Rebun Island of Hokkaido, by long-range dispersal across a distance of 1200 km. This finding reveals that the biota of the oceanic Ullung Island has not exclusively originated from the Asian mainland, but that some elements have originated from the more distant archipelago of Japan and the Far East of Russia.
{"title":"Long-distance dispersal from island to island: colonisation of an oceanic island in the vicinity of the Asian continent by the land snail genus Karaftohelix (Gastropoda: Camaenidae)","authors":"K. Kimura, S. Chiba, L. Prozorova, J. Pak","doi":"10.1080/13235818.2022.2066454","DOIUrl":"https://doi.org/10.1080/13235818.2022.2066454","url":null,"abstract":"ABSTRACT Ullung Island is an oceanic island in the Sea of Japan about 130 km distant from the Korean peninsula. The biota of this oceanic island is thought to be derived from the closest continental region while the importance of long-distance dispersal from other areas for the formation of the Ullung Island biota was considered negligible. In this study, we have examined the origin of the Ullung Island-endemic land snail Karaftohelix adamsi (Kuroda & Hukuda, 1944) using a molecular phylogenetic approach with two mitochondrial (COI and 16S rRNA) and nuclear (ITS regions) DNA sequences. Our results revealed that K. adamsi has originated from the northernmost region of the Japanese archipelago or Sakhalin Island, most likely from Rebun Island of Hokkaido, by long-range dispersal across a distance of 1200 km. This finding reveals that the biota of the oceanic Ullung Island has not exclusively originated from the Asian mainland, but that some elements have originated from the more distant archipelago of Japan and the Far East of Russia.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45121368","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}
Pub Date : 2022-04-03DOI: 10.1080/13235818.2022.2068112
H. Fukuda, Hiroshi Ishikawa, Soma Ito, T. Haga
ABSTRACT A new species of tellinid, Nitidotellina hachiensis, is described from Japan. The shell of this species is characterised by a pair of strong keels that run from the beaks to the posterior end and forms a prominent posterior notch. The recent individuals are found only in the Seto Inland Sea (Okayama, Hiroshima, Yamaguchi and Ehime prefectures), while the one fossil record so far known is from the Chibanian (middle Pleistocene) Toyohashi Formation in Aichi Prefecture, central Honshū. Living individuals are uncommon and mainly found living in sandy mud bottoms from the low tide line down to the subtidal zone in the inner parts of large bays. It can be regarded as endangered due to the recent habitat loss and water pollution of inner bay environments.
{"title":"Nitidotellina hachiensis n. sp. (Bivalvia: Tellinidae) from the Seto Inland Sea, between Honshū and Shikoku, western Japan","authors":"H. Fukuda, Hiroshi Ishikawa, Soma Ito, T. Haga","doi":"10.1080/13235818.2022.2068112","DOIUrl":"https://doi.org/10.1080/13235818.2022.2068112","url":null,"abstract":"ABSTRACT A new species of tellinid, Nitidotellina hachiensis, is described from Japan. The shell of this species is characterised by a pair of strong keels that run from the beaks to the posterior end and forms a prominent posterior notch. The recent individuals are found only in the Seto Inland Sea (Okayama, Hiroshima, Yamaguchi and Ehime prefectures), while the one fossil record so far known is from the Chibanian (middle Pleistocene) Toyohashi Formation in Aichi Prefecture, central Honshū. Living individuals are uncommon and mainly found living in sandy mud bottoms from the low tide line down to the subtidal zone in the inner parts of large bays. It can be regarded as endangered due to the recent habitat loss and water pollution of inner bay environments.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48652524","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}
Pub Date : 2022-04-03DOI: 10.1080/13235818.2022.2073651
M. Lebata-Ramos, Cleresa S. Dionela, E. Solis, Jonas P. Mediavilla, Rema C. Sibonga, Schedar Rose M. Novilla
ABSTRACT This study determined the seasonality of Magallana bilineata spat settlement in a natural oyster bed and established surface texture preference of competent larvae by comparing the numbers of spat settling on the smooth and rough surfaces of ceramic tiles over a period of 31 months. This will guide farmers when to deploy cultches to maximise spat harvest. Regardless of tile orientation, spat numbers were significantly higher on the rough side (129.07 ± 9.3 m−2) than on the smooth side (66.95 ± 7.0 m−2). Spat collection was highest in March, June and July in each of 2015, 2016 and 2017. There was no significant correlation between the number of spat settling in each month with temperature, salinity, pH, dissolved oxygen (DO), sulphide, phosphate, nitrate, nitrite and ammonia concentrations, plankton density measured at deployment and retrieval of tiles, except for DO during deployment. The only significant correlations with mean shell length (SL) were with DO and ammonia during tile retrieval. Mean SL did not significantly differ between tile orientations and surfaces but differed between months, being highest in August 2015 and August 2016. From these results, it is best to deploy roughened cultches in this particular area in March, June and July.
{"title":"Settlement of oyster Magallana bilineata (Röding, 1798) spat in the natural environment: seasonality and substrate texture preference","authors":"M. Lebata-Ramos, Cleresa S. Dionela, E. Solis, Jonas P. Mediavilla, Rema C. Sibonga, Schedar Rose M. Novilla","doi":"10.1080/13235818.2022.2073651","DOIUrl":"https://doi.org/10.1080/13235818.2022.2073651","url":null,"abstract":"ABSTRACT This study determined the seasonality of Magallana bilineata spat settlement in a natural oyster bed and established surface texture preference of competent larvae by comparing the numbers of spat settling on the smooth and rough surfaces of ceramic tiles over a period of 31 months. This will guide farmers when to deploy cultches to maximise spat harvest. Regardless of tile orientation, spat numbers were significantly higher on the rough side (129.07 ± 9.3 m−2) than on the smooth side (66.95 ± 7.0 m−2). Spat collection was highest in March, June and July in each of 2015, 2016 and 2017. There was no significant correlation between the number of spat settling in each month with temperature, salinity, pH, dissolved oxygen (DO), sulphide, phosphate, nitrate, nitrite and ammonia concentrations, plankton density measured at deployment and retrieval of tiles, except for DO during deployment. The only significant correlations with mean shell length (SL) were with DO and ammonia during tile retrieval. Mean SL did not significantly differ between tile orientations and surfaces but differed between months, being highest in August 2015 and August 2016. From these results, it is best to deploy roughened cultches in this particular area in March, June and July.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43666698","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}
Pub Date : 2022-04-03DOI: 10.1080/13235818.2022.2075081
A. Bhosale, T. Thackeray, Omkar V. Yadav
ABSTRACT We here describe a new species of the streptaxid snail genus Haploptychius from the northern Western Ghats of Maharashtra, which is the third member of the genus from India. Haploptychius sahyadriensis n. sp. is distinguished from the other Indian and South-East Asian Haploptychius sp. in having suboblique-heliciform shell, low spire and presence of one strong parietal lamella. The new species has unique genital anatomy in having a long penis with a penial sheath, the presence of penial appendix, penial hooks, atrium and vagina with longitudinal ridges and irregular transverse ridges respectively, but without any hooks. It bears a shiny muscle near the junction of the vagina, gametolytic duct and the free oviduct. Based on the shell morphology and genital characters, the new species is placed in the genus Haploptychius. Our study reveals that other unexplored areas in the northern Western Ghats may potentially harbour more undescribed land snail species which could be endemic. Publication LSID: lsid:http://zoobank.org:pub:18C6E99C-6FDE-46A6-8E12-EB834D588910
摘要本文描述了来自印度马哈拉施特拉邦西高止山脉北部的链状蜗牛属Haploptychius的一个新种，这是该属第三个来自印度的成员。sahyadriensis n. sp.与其他印度和东南亚的haploptychus sp.的区别在于具有近斜螺旋形外壳，低尖顶和存在一个强大的顶板。该新种具有独特的生殖器解剖结构，有长阴茎，有阴茎鞘，有阴茎阑尾，有阴茎钩，心房和阴道分别有纵脊和不规则横脊，但没有任何钩。在阴道、配子体导管和游离输卵管交界处附近有一块有光泽的肌肉。根据壳形态和生殖特征，该新种归属于Haploptychius属。我们的研究表明，在西高止山脉北部的其他未开发地区可能潜藏着更多未描述的陆地蜗牛物种，这些物种可能是地方性的。出版物LSID: LSID: http://zoobank.org:pub:18C6E99C-6FDE-46A6-8E12-EB834D588910
{"title":"A new species of Haploptychius Möllendorff, 1906 (Stylommatophora: Streptaxidae) from the Western Ghats, India","authors":"A. Bhosale, T. Thackeray, Omkar V. Yadav","doi":"10.1080/13235818.2022.2075081","DOIUrl":"https://doi.org/10.1080/13235818.2022.2075081","url":null,"abstract":"ABSTRACT We here describe a new species of the streptaxid snail genus Haploptychius from the northern Western Ghats of Maharashtra, which is the third member of the genus from India. Haploptychius sahyadriensis n. sp. is distinguished from the other Indian and South-East Asian Haploptychius sp. in having suboblique-heliciform shell, low spire and presence of one strong parietal lamella. The new species has unique genital anatomy in having a long penis with a penial sheath, the presence of penial appendix, penial hooks, atrium and vagina with longitudinal ridges and irregular transverse ridges respectively, but without any hooks. It bears a shiny muscle near the junction of the vagina, gametolytic duct and the free oviduct. Based on the shell morphology and genital characters, the new species is placed in the genus Haploptychius. Our study reveals that other unexplored areas in the northern Western Ghats may potentially harbour more undescribed land snail species which could be endemic. Publication LSID: lsid:http://zoobank.org:pub:18C6E99C-6FDE-46A6-8E12-EB834D588910","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42118820","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}
Pub Date : 2022-04-03DOI: 10.1080/13235818.2022.2070101
Md. Firoz Shah, Md Abdullah Al Mamun, Muhammad Tofazzal Hossain, M. Moniruzzaman, S. Yeasmine, M. Uddin, M. Jasim Uddin
ABSTRACT Scientists and environmentalists are searching for biological remedies to reduce E. coli concentrations in waterbodies to acceptable levels. The present research was conducted to investigate clearance of E. coli isolated from freshwater mussels (Lamellidens marginalis) in the Old Brahmaputra River, Mymensingh, Bangladesh by conspecific mussels from the same river in aquarium conditions. Mussels were acclimated, depurated and divided into three shell length (SL) groups. Small (38.28 ± 2.81 mm), medium (47.28 ± 1.52 mm) and large (55.89 ± 2.25 mm) mussels were assigned to aquaria designated as T2, T3 and T4 respectively whereas empty mussel shells were assigned to T1 as control in triplicate. After addition of pure E. coli suspensions, 3 mL water samples from each aquarium were collected at hourly intervals for 12 h for total E. coli count (TEC). Statistical analysis revealed that both time and treatments have significant effects (P < 0.05) on TEC. Presence of live mussels caused 1.41–1.63 log10 reduction of TEC after 12 h compared to the control. However, such differences were not consistent among the different SL groups. In conclusion, L. marginalis is capable of reducing E. coli concentrations although the efficacy is not consistently related with mussels’ shell lengths.
{"title":"Clearance of Escherichia coli by the freshwater mussel Lamellidens marginalis in laboratory conditions","authors":"Md. Firoz Shah, Md Abdullah Al Mamun, Muhammad Tofazzal Hossain, M. Moniruzzaman, S. Yeasmine, M. Uddin, M. Jasim Uddin","doi":"10.1080/13235818.2022.2070101","DOIUrl":"https://doi.org/10.1080/13235818.2022.2070101","url":null,"abstract":"ABSTRACT Scientists and environmentalists are searching for biological remedies to reduce E. coli concentrations in waterbodies to acceptable levels. The present research was conducted to investigate clearance of E. coli isolated from freshwater mussels (Lamellidens marginalis) in the Old Brahmaputra River, Mymensingh, Bangladesh by conspecific mussels from the same river in aquarium conditions. Mussels were acclimated, depurated and divided into three shell length (SL) groups. Small (38.28 ± 2.81 mm), medium (47.28 ± 1.52 mm) and large (55.89 ± 2.25 mm) mussels were assigned to aquaria designated as T2, T3 and T4 respectively whereas empty mussel shells were assigned to T1 as control in triplicate. After addition of pure E. coli suspensions, 3 mL water samples from each aquarium were collected at hourly intervals for 12 h for total E. coli count (TEC). Statistical analysis revealed that both time and treatments have significant effects (P < 0.05) on TEC. Presence of live mussels caused 1.41–1.63 log10 reduction of TEC after 12 h compared to the control. However, such differences were not consistent among the different SL groups. In conclusion, L. marginalis is capable of reducing E. coli concentrations although the efficacy is not consistently related with mussels’ shell lengths.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49077632","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}
Pub Date : 2022-04-03DOI: 10.1080/13235818.2022.2065439
Rongcheng Rao, Heding Shen
ABSTRACT In order to study how Onchidium reevesii predict tides, the cDNA encoding the precursor of the pedal peptide (Pep), a neuropeptide that plays an important role in neuromotor regulation, was cloned by RACE (Rapid Amplification of cDNA Ends) technology. Bioinformatics analysis was carried out on the sequence of the cloned cDNA. The frequency spectra of the intertidal zone were obtained and Quantitative Real-time PCR (qRT-PCR) experiments were carried out to study the connection between low-frequency sound and tidal perception. The full length of the cDNA was 1627 bp and it encodes 15 copies of Pep; The frequency spectra and qRT-PCR results suggest that O. reevesii can distinguish low-frequency sound waves (100–130 Hz) produced by tides, enabling them to avoid tidal immersion or to come out to feed after the tides falls. In this species, Pep may act as the neurotransmitter for tidal perception based on low-frequency sound signals. These experiments will provide a reference for the further study of the mechanism by which O. reevesii senses tides.
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