Pub Date : 2023-01-02DOI: 10.1080/13235818.2023.2174364
{"title":"Addendum to: Uncovering the biodiversity of New Zealand Solenogastres (Mollusca, Aplacophora) with three new species of Proneomeniidae Simroth, 1893 and new data for Dorymenia quincarinata (Ponder, 1970). Molluscan Research 42, 271–287.","authors":"","doi":"10.1080/13235818.2023.2174364","DOIUrl":"https://doi.org/10.1080/13235818.2023.2174364","url":null,"abstract":"","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"43 1","pages":"74 - 75"},"PeriodicalIF":1.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49204150","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 : 2023-01-02DOI: 10.1080/13235818.2023.2170160
Parfait Laurent Basga, Romuald Isaka Kamwa Ngassam, P. Nwane, Dili Siddi Ousman Ila, R. Mimpfoundi
ABSTRACT Climatic stratification from equatorial rainforest to Sahelian savannah in Cameroon implies successive bioclimatic ecosystems, various natural and artificial situations that may generate morphological and genetic adaptation of populations of Bulinus forskalii (Ehrenberg, 1831) which is widely distributed throughout the country. The present research was undertaken on 955 snails sampled from 12 populations along a south–north transect to investigate morphological variations of shells. Shell colour varied from dark brown to whitish with Sudano–Sahelian shells being brownish through to whitish, shouldered and strongly carinate. Morphometric characters varied greatly from one population to another, with all shell parameters being highly correlated to shell height. Sudano–Sahelian shells were smaller than equatorial shells. From Sangmélima in the equatorial forest region to Marao in the Sudano–Sahelian region a gradual decrease of shell dimensions was apparent, indicating a morphocline. This could reflect the role played by ecological factors on snail population dynamics.
{"title":"Morphological variations among populations of Bulinus forskalii (Ehrenberg, 1831) from Cameroon","authors":"Parfait Laurent Basga, Romuald Isaka Kamwa Ngassam, P. Nwane, Dili Siddi Ousman Ila, R. Mimpfoundi","doi":"10.1080/13235818.2023.2170160","DOIUrl":"https://doi.org/10.1080/13235818.2023.2170160","url":null,"abstract":"ABSTRACT Climatic stratification from equatorial rainforest to Sahelian savannah in Cameroon implies successive bioclimatic ecosystems, various natural and artificial situations that may generate morphological and genetic adaptation of populations of Bulinus forskalii (Ehrenberg, 1831) which is widely distributed throughout the country. The present research was undertaken on 955 snails sampled from 12 populations along a south–north transect to investigate morphological variations of shells. Shell colour varied from dark brown to whitish with Sudano–Sahelian shells being brownish through to whitish, shouldered and strongly carinate. Morphometric characters varied greatly from one population to another, with all shell parameters being highly correlated to shell height. Sudano–Sahelian shells were smaller than equatorial shells. From Sangmélima in the equatorial forest region to Marao in the Sudano–Sahelian region a gradual decrease of shell dimensions was apparent, indicating a morphocline. This could reflect the role played by ecological factors on snail population dynamics.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"43 1","pages":"50 - 60"},"PeriodicalIF":1.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49426416","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 : 2022-12-23DOI: 10.1080/13235818.2022.2151070
W. Ponder
ABSTRACT Arthritica korniushini n. sp. is described from three groups of artesian mound springs in the southwestern part of the Lake Eyre Spring Supergroup. All other described species of Arthritica are oceanic or estuarine. The four previously described Australian species referrable to Arthritica are reviewed.
{"title":"The first galeommatoidean from inland waters: a new species of Arthritica (Bivalvia, Lasaeidae) from artesian springs in South Australia, with comments on other Australian members of the genus","authors":"W. Ponder","doi":"10.1080/13235818.2022.2151070","DOIUrl":"https://doi.org/10.1080/13235818.2022.2151070","url":null,"abstract":"ABSTRACT Arthritica korniushini n. sp. is described from three groups of artesian mound springs in the southwestern part of the Lake Eyre Spring Supergroup. All other described species of Arthritica are oceanic or estuarine. The four previously described Australian species referrable to Arthritica are reviewed.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"43 1","pages":"22 - 33"},"PeriodicalIF":1.0,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49417122","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 : 2022-11-18DOI: 10.1080/13235818.2022.2144089
Abigail M. Smith, B. Peebles, H. Spencer
ABSTRACT The dorsal shell surface of the New Zealand-endemic chitonid Onithochiton neglectus exhibits ocelli (eyes) associated with sensory organs (aesthetes) penetrating the shell. Each ocellus includes a mineral lens which focusses light onto a retina, potentially able to resolve images. In order to discover the spatial resolution of lenses of O. neglectus, we isolated them, examined their mineralogy with X-ray diffractometry, imaged the constituent crystals with scanning electron microscopy, and mounted them onto a camera to directly observe and record images. Lenses of O. neglectus are aragonitic and therefore birefringent, providing two different focal lengths, possibly one for in-air and one for underwater vision. Chitons may be able to image nearby shapes with visual acuity equivalent to 6/24 (m), a VAdec of 0.25. Onithochiton neglectus lenses can focus images in air about as well as a person with low visual acuity, sufficient to discern shapes and shadows in the surrounding environment. Lenses from subtidal O. neglectus were less eroded than those from intertidal environments; chitons in different habitats exhibit different visual acuity. It is unclear why a few lineages of chitons have developed such complex eyes; we speculate that body-orientation and navigation could be among the advantages driving such development.
{"title":"Directly observed images through the shell-lenses of Onithochiton neglectus (Mollusca: Polyplacophora: Chitonidae)","authors":"Abigail M. Smith, B. Peebles, H. Spencer","doi":"10.1080/13235818.2022.2144089","DOIUrl":"https://doi.org/10.1080/13235818.2022.2144089","url":null,"abstract":"ABSTRACT The dorsal shell surface of the New Zealand-endemic chitonid Onithochiton neglectus exhibits ocelli (eyes) associated with sensory organs (aesthetes) penetrating the shell. Each ocellus includes a mineral lens which focusses light onto a retina, potentially able to resolve images. In order to discover the spatial resolution of lenses of O. neglectus, we isolated them, examined their mineralogy with X-ray diffractometry, imaged the constituent crystals with scanning electron microscopy, and mounted them onto a camera to directly observe and record images. Lenses of O. neglectus are aragonitic and therefore birefringent, providing two different focal lengths, possibly one for in-air and one for underwater vision. Chitons may be able to image nearby shapes with visual acuity equivalent to 6/24 (m), a VAdec of 0.25. Onithochiton neglectus lenses can focus images in air about as well as a person with low visual acuity, sufficient to discern shapes and shadows in the surrounding environment. Lenses from subtidal O. neglectus were less eroded than those from intertidal environments; chitons in different habitats exhibit different visual acuity. It is unclear why a few lineages of chitons have developed such complex eyes; we speculate that body-orientation and navigation could be among the advantages driving such development.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"43 1","pages":"4 - 11"},"PeriodicalIF":1.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44401333","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 : 2022-10-02DOI: 10.1080/13235818.2022.2143069
Madelyn G. McCutcheon, K. Kocot, M. Carmen Cobo
ABSTRACT Aplacophorans are vermiform marine molluscs found in benthic habitats worldwide. However, there is an extreme lack of knowledge about their true diversity. There are around 440 described species, but the true number is estimated to be at least tenfold higher. Identifying most solenogaster aplacophorans to the species, genus and sometimes even family level requires histology so that internal anatomical structures, such as the radula, foregut glands, and reproductive organs can be characterised. The aplacophoran faunas of many regions have barely been studied or have not been studied at all. An example is the waters surrounding New Zealand where only three species have been described to date. To advance the understanding of the biodiversity of Aplacophora, we describe three new species of solenogaster aplacophorans from New Zealand, all of which belong to the family Proneomeniidae Simroth, 1893: Dorymenia tanifa n. sp., Dorymenia ancora n. sp. and Dorymenia lucida n. sp. New data on Dorymenia quincarinata (Ponder, 1970) are also included and a comparison of all Dorymenia species is described in detail. In addition, DNA barcodes were obtained from D. lucida n. sp. and D. quincarinata, which will be useful for future specimen identification by non-experts and future studies on aplacophoran evolution.
{"title":"Uncovering the biodiversity of New Zealand Solenogastres (Mollusca, Aplacophora) with three new species of Proneomeniidae Simroth, 1893 and new data for Dorymenia quincarinata (Ponder, 1970)","authors":"Madelyn G. McCutcheon, K. Kocot, M. Carmen Cobo","doi":"10.1080/13235818.2022.2143069","DOIUrl":"https://doi.org/10.1080/13235818.2022.2143069","url":null,"abstract":"ABSTRACT Aplacophorans are vermiform marine molluscs found in benthic habitats worldwide. However, there is an extreme lack of knowledge about their true diversity. There are around 440 described species, but the true number is estimated to be at least tenfold higher. Identifying most solenogaster aplacophorans to the species, genus and sometimes even family level requires histology so that internal anatomical structures, such as the radula, foregut glands, and reproductive organs can be characterised. The aplacophoran faunas of many regions have barely been studied or have not been studied at all. An example is the waters surrounding New Zealand where only three species have been described to date. To advance the understanding of the biodiversity of Aplacophora, we describe three new species of solenogaster aplacophorans from New Zealand, all of which belong to the family Proneomeniidae Simroth, 1893: Dorymenia tanifa n. sp., Dorymenia ancora n. sp. and Dorymenia lucida n. sp. New data on Dorymenia quincarinata (Ponder, 1970) are also included and a comparison of all Dorymenia species is described in detail. In addition, DNA barcodes were obtained from D. lucida n. sp. and D. quincarinata, which will be useful for future specimen identification by non-experts and future studies on aplacophoran evolution.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"42 1","pages":"271 - 286"},"PeriodicalIF":1.0,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42933379","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 : 2022-10-02DOI: 10.1080/13235818.2022.2139583
P. Tudu, S. Sajan, Soumen Roy, Amit Mukhapadhyay, B. Tripathy, A. Mohapatra
ABSTRACT A new species of head-shield sea slug, Melanochlamys bengalensis, is described from the northern part of the eastern coast of India using both external and internal morphological characters. Its novel status is supported by a molecular analysis. The maximum likelihood (ML) genetic tree (COI gene sequence) indicates that the new species represents a distinct clade compared to the other species of the genus Melanochlamys. The K2P distance of the new species is 16.2–23.7%, which is considerably more than the other congeners. This species was collected from the intertidal zone of the sandy beaches of Bakkhali, Tajpur, New Digha, Udaipur, Talsari, Chandipur and Kanika Island. Additionally, the list of valid species and distribution of all members of the genus Melanochlamys is presented herein.
{"title":"A new species of cephalaspidean sea slug of the genus Melanochlamys Cheeseman, 1881 (Heterobranchia: Aglajidae) from the Bay of Bengal, India","authors":"P. Tudu, S. Sajan, Soumen Roy, Amit Mukhapadhyay, B. Tripathy, A. Mohapatra","doi":"10.1080/13235818.2022.2139583","DOIUrl":"https://doi.org/10.1080/13235818.2022.2139583","url":null,"abstract":"ABSTRACT A new species of head-shield sea slug, Melanochlamys bengalensis, is described from the northern part of the eastern coast of India using both external and internal morphological characters. Its novel status is supported by a molecular analysis. The maximum likelihood (ML) genetic tree (COI gene sequence) indicates that the new species represents a distinct clade compared to the other species of the genus Melanochlamys. The K2P distance of the new species is 16.2–23.7%, which is considerably more than the other congeners. This species was collected from the intertidal zone of the sandy beaches of Bakkhali, Tajpur, New Digha, Udaipur, Talsari, Chandipur and Kanika Island. Additionally, the list of valid species and distribution of all members of the genus Melanochlamys is presented herein.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"42 1","pages":"328 - 337"},"PeriodicalIF":1.0,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47890764","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 : 2022-10-02DOI: 10.1080/13235818.2022.2129943
Sebastian Hofman, J. Grego, L. Beran, Aleksandra Jaszczyńska, A. Osikowski, A. Falniowski
ABSTRACT Kerkia is a snail genus inhabiting mainly subterranean waters. Live specimens of Kerkia were collected in the West Balkans. Mitochondrial cytochrome c oxidase subunit I and nuclear histone H3 were sequenced. Populations of Kerkia molecularly represented 10 mOTUs, each deserving a species rank. Apart from known species, five new species are described. The interspecies differences in shell morphology were slight and thus morphology did not reflect the evident molecular differences. All available information about the penes and female reproductive organs are summarised and their limited usefulness in species-level taxonomy is discussed. Kerkia seems to represent another example of morphostatic evolution, a result of non-adaptive radiation marked by the rapid proliferation of sibling species, whose ecology most probably remains the same. In Kerkia, intrapopulation genetic diversity does not (or almost does not) exist, and the same is true for intraspecies variation. At the same time, there is a high level of molecular difference between the species. Despite potential means for range expansion of the stygobiont fauna provided by interstitial habitats, which reduce the levels of endemism in some stygobiont gastropod species, the species of stygobiont Kerkia are restricted to small geographic areas. LSID: urn:lsid:zoobank.org:pub:F710D90A-4427-4C64-AAFE-5ADE89EEAABC
{"title":"Kerkia Radoman, 1978 (Caenogastropoda: Hydrobiidae): endemism, apparently morphostatic evolution and cryptic speciation","authors":"Sebastian Hofman, J. Grego, L. Beran, Aleksandra Jaszczyńska, A. Osikowski, A. Falniowski","doi":"10.1080/13235818.2022.2129943","DOIUrl":"https://doi.org/10.1080/13235818.2022.2129943","url":null,"abstract":"ABSTRACT Kerkia is a snail genus inhabiting mainly subterranean waters. Live specimens of Kerkia were collected in the West Balkans. Mitochondrial cytochrome c oxidase subunit I and nuclear histone H3 were sequenced. Populations of Kerkia molecularly represented 10 mOTUs, each deserving a species rank. Apart from known species, five new species are described. The interspecies differences in shell morphology were slight and thus morphology did not reflect the evident molecular differences. All available information about the penes and female reproductive organs are summarised and their limited usefulness in species-level taxonomy is discussed. Kerkia seems to represent another example of morphostatic evolution, a result of non-adaptive radiation marked by the rapid proliferation of sibling species, whose ecology most probably remains the same. In Kerkia, intrapopulation genetic diversity does not (or almost does not) exist, and the same is true for intraspecies variation. At the same time, there is a high level of molecular difference between the species. Despite potential means for range expansion of the stygobiont fauna provided by interstitial habitats, which reduce the levels of endemism in some stygobiont gastropod species, the species of stygobiont Kerkia are restricted to small geographic areas. LSID: urn:lsid:zoobank.org:pub:F710D90A-4427-4C64-AAFE-5ADE89EEAABC","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"42 1","pages":"295 - 319"},"PeriodicalIF":1.0,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48250662","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 : 2022-09-20DOI: 10.1080/13235818.2022.2124344
D. Lindberg, G. Haszprunar
ABSTRACT For over 50 years Winston Ponder has been at the forefront of molluscan research. Young Winston collected land snails in the environs of Lower Hutt, New Zealand and marine species at Waikanae Beach northwest of Wellington. He attended Victoria University in Wellington in 1959 but moved to Auckland University in 1960 to study under Professor John E. Morton, with whom he completed his B.Sc. in 1963 (Galeommatoidea), his M.Sc. with 1st Class Honours in 1965 (Rissoidae), and his Ph.D. in 1968 (Neogastropoda). Winston was appointed Curator of Marine Invertebrates at the Dominion Museum in 1967. However, he soon moved to Australia after accepting the position of Curator of Molluscs at the Australian Museum in 1968. He would spend the next 37 years there. Winston has published in almost 50 different scientific journals and numerous edited books and volumes. He has collaborated with almost 100 different co-authors from around the world and has addressed multiple taxa and questions across the phylum. He has been a strong advocate for Australasian malacology. His advocacy has also included a robust outreach to students. However, his advancement of Australasian malacology was not done to the exclusion of the global role and needs of the discipline.
{"title":"Laudatio for Dr. Winston F. Ponder – a life of malacology","authors":"D. Lindberg, G. Haszprunar","doi":"10.1080/13235818.2022.2124344","DOIUrl":"https://doi.org/10.1080/13235818.2022.2124344","url":null,"abstract":"ABSTRACT For over 50 years Winston Ponder has been at the forefront of molluscan research. Young Winston collected land snails in the environs of Lower Hutt, New Zealand and marine species at Waikanae Beach northwest of Wellington. He attended Victoria University in Wellington in 1959 but moved to Auckland University in 1960 to study under Professor John E. Morton, with whom he completed his B.Sc. in 1963 (Galeommatoidea), his M.Sc. with 1st Class Honours in 1965 (Rissoidae), and his Ph.D. in 1968 (Neogastropoda). Winston was appointed Curator of Marine Invertebrates at the Dominion Museum in 1967. However, he soon moved to Australia after accepting the position of Curator of Molluscs at the Australian Museum in 1968. He would spend the next 37 years there. Winston has published in almost 50 different scientific journals and numerous edited books and volumes. He has collaborated with almost 100 different co-authors from around the world and has addressed multiple taxa and questions across the phylum. He has been a strong advocate for Australasian malacology. His advocacy has also included a robust outreach to students. However, his advancement of Australasian malacology was not done to the exclusion of the global role and needs of the discipline.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"42 1","pages":"261 - 270"},"PeriodicalIF":1.0,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48351535","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 : 2022-09-19DOI: 10.1080/13235818.2022.2124581
H. Wägele, Kristina Knezevic, Alaa Y. Moustafa
ABSTRACT Gastropoda is probably the best-known taxon which uses acid glands as an antifouling strategy and as defence against putative predators. Here, defensive acid-secreting cell types in two taxa of Caeonogastropoda, Cypraeidae and Ovulidae, were investigated. This study confirms the presence of acid epithelial glands in several members of the Cypraeidae, with the glands of the Cypraeidae species Naria nebrites and Mauritia mauritiana being newly described here. We also present results for the first time on a member of the family Ovulidae, Simnia spelta. All investigated species exhibited an outer epidermis with glandular acid cells of columnar shape with large clear, colourless vacuoles, thus resembling the previously described species of these taxa. None of the investigated cypraeid and ovulid species studied here exhibited subepidermal acid glands in the mantle, which are typical for the Velutinoidea. The phylogenetic value of these findings is discussed in relation to a recently published phylogeny on Caenogastropoda comprising all families of Cypraeoidea and Velutinoidea.
{"title":"Defensive acid-secreting glands in Cypraeoidea (Caenogastropoda, Mollusca)","authors":"H. Wägele, Kristina Knezevic, Alaa Y. Moustafa","doi":"10.1080/13235818.2022.2124581","DOIUrl":"https://doi.org/10.1080/13235818.2022.2124581","url":null,"abstract":"ABSTRACT Gastropoda is probably the best-known taxon which uses acid glands as an antifouling strategy and as defence against putative predators. Here, defensive acid-secreting cell types in two taxa of Caeonogastropoda, Cypraeidae and Ovulidae, were investigated. This study confirms the presence of acid epithelial glands in several members of the Cypraeidae, with the glands of the Cypraeidae species Naria nebrites and Mauritia mauritiana being newly described here. We also present results for the first time on a member of the family Ovulidae, Simnia spelta. All investigated species exhibited an outer epidermis with glandular acid cells of columnar shape with large clear, colourless vacuoles, thus resembling the previously described species of these taxa. None of the investigated cypraeid and ovulid species studied here exhibited subepidermal acid glands in the mantle, which are typical for the Velutinoidea. The phylogenetic value of these findings is discussed in relation to a recently published phylogeny on Caenogastropoda comprising all families of Cypraeoidea and Velutinoidea.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"42 1","pages":"320 - 327"},"PeriodicalIF":1.0,"publicationDate":"2022-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47666341","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 : 2022-09-17DOI: 10.1080/13235818.2022.2113601
Zeyneb Ladouali, Naouel Boudjema, Farida Loudjani, S. Boubsil, C. Abdennour
ABSTRACT The aim of this work is to investigate the effects of environmental stressors on male reproductive biomarkers in sentinel species of bivalves inhabiting Annaba estuaries, considered to be reservoirs receiving industrial, agricultural, and domestic discharges. Male Mytilus galloprovincialis were collected in four seasons from a non-polluted site (S1) and two other locations receiving untreated sewage (S2) and a mixture of contaminants (S3). Testicular sperm concentration, motility, velocity, the amplitude of lateral head displacement (ALH), the beat cross frequency (BCF), spermatozoan DNA fragmentation, and histological profiles were evaluated. Individuals from S2 and S3 have diminished sperm concentration, motility, velocity, ALH and BCF, along with a significantly increased spermatozoan DNA fragmentation that was much higher in S3. Testicular tissues demonstrated histo-pathological alterations in mussels subjected to anthropogenic activities during the four seasons. In conclusion, reproductive biomarkers of male mussels were both spatially and temporally variable, which is probably correlated to pollution types and the changing seasonal stressors.
{"title":"The effects of environmental stressors on gonad biomarkers of a sentinel marine bivalve, Mytilus galloprovincialis","authors":"Zeyneb Ladouali, Naouel Boudjema, Farida Loudjani, S. Boubsil, C. Abdennour","doi":"10.1080/13235818.2022.2113601","DOIUrl":"https://doi.org/10.1080/13235818.2022.2113601","url":null,"abstract":"ABSTRACT The aim of this work is to investigate the effects of environmental stressors on male reproductive biomarkers in sentinel species of bivalves inhabiting Annaba estuaries, considered to be reservoirs receiving industrial, agricultural, and domestic discharges. Male Mytilus galloprovincialis were collected in four seasons from a non-polluted site (S1) and two other locations receiving untreated sewage (S2) and a mixture of contaminants (S3). Testicular sperm concentration, motility, velocity, the amplitude of lateral head displacement (ALH), the beat cross frequency (BCF), spermatozoan DNA fragmentation, and histological profiles were evaluated. Individuals from S2 and S3 have diminished sperm concentration, motility, velocity, ALH and BCF, along with a significantly increased spermatozoan DNA fragmentation that was much higher in S3. Testicular tissues demonstrated histo-pathological alterations in mussels subjected to anthropogenic activities during the four seasons. In conclusion, reproductive biomarkers of male mussels were both spatially and temporally variable, which is probably correlated to pollution types and the changing seasonal stressors.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"42 1","pages":"287 - 294"},"PeriodicalIF":1.0,"publicationDate":"2022-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43052171","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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