Pub Date : 2022-12-26DOI: 10.1080/07924259.2022.2156822
Yan-Hao Yang, Rui Wang, Ming Li, Huizan Yang, Guang-Hua Huang, K. Ma, G. Qiu, Yong Lin
ABSTRACT The giant freshwater prawn (Macrobrachium rosenbergii), which is widely distributed in Southeast Asia and the western Pacific, is an important commercial prawn species. However, the molecular mechanism of ovarian development is unclear, and available data on the ovarian transcriptome of M. rosenbergii are limited. In this study, we constructed transcriptomes of female (ZW) and super female (WW) of M. rosenbergii ovaries to discover genes and pathways related to ovarian development. A total of 71,555 unigenes were obtained, with an average length of 1,530 bp and N50 of 3001 bp, and 15,792 (29.3%) of them were annotated. A total of 13,610 differentially expressed genes (DEGs) were detected. KEGG pathway analysis showed that multiple pathways related to ovarian development were significantly regulated, such as retinol metabolism, notch signalling pathway, cell cycle, wnt signalling pathway, FoxO signalling pathway, and mTOR signalling pathway. In addition, 12 putative ovarian development-related genes, including FZD9, DDR2, PSMC3IP, CREBBP, DMC1, WBP2NL, DHRS4, SPO11, BCDO2, SDR16C5, CPEB, RDH5, were identified. Our findings will provide a valuable archive for future functional analysis of genes related to ovarian development and future discoveries of the underlying molecular mechanisms of ovarian development.
{"title":"Comparative transcriptomes analysis of the ovary reveals potential ovarian development-related genes and pathways in Macrobrachium rosenbergii","authors":"Yan-Hao Yang, Rui Wang, Ming Li, Huizan Yang, Guang-Hua Huang, K. Ma, G. Qiu, Yong Lin","doi":"10.1080/07924259.2022.2156822","DOIUrl":"https://doi.org/10.1080/07924259.2022.2156822","url":null,"abstract":"ABSTRACT The giant freshwater prawn (Macrobrachium rosenbergii), which is widely distributed in Southeast Asia and the western Pacific, is an important commercial prawn species. However, the molecular mechanism of ovarian development is unclear, and available data on the ovarian transcriptome of M. rosenbergii are limited. In this study, we constructed transcriptomes of female (ZW) and super female (WW) of M. rosenbergii ovaries to discover genes and pathways related to ovarian development. A total of 71,555 unigenes were obtained, with an average length of 1,530 bp and N50 of 3001 bp, and 15,792 (29.3%) of them were annotated. A total of 13,610 differentially expressed genes (DEGs) were detected. KEGG pathway analysis showed that multiple pathways related to ovarian development were significantly regulated, such as retinol metabolism, notch signalling pathway, cell cycle, wnt signalling pathway, FoxO signalling pathway, and mTOR signalling pathway. In addition, 12 putative ovarian development-related genes, including FZD9, DDR2, PSMC3IP, CREBBP, DMC1, WBP2NL, DHRS4, SPO11, BCDO2, SDR16C5, CPEB, RDH5, were identified. Our findings will provide a valuable archive for future functional analysis of genes related to ovarian development and future discoveries of the underlying molecular mechanisms of ovarian development.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48238957","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 : 2022-11-11DOI: 10.1080/07924259.2022.2142485
Milena Silva Jaconis, C. S. Nogueira, Gabriel Vieira Martins Rezende-Gois, J. F. Perroca, R. C. Costa
ABSTRACT The crab Hepatus pudibundus is a bycatch of the shrimp fishing industry, and despite having no commercial value, it is impacted by fishing activities. In this way, research about relative growth and sexual maturity can help to understand the life cycle of fisheries-affected species. Thus, the present study aimed to estimate morphological sexual maturity (MSM) and analyse the relative growth of a population of H. pudibundus. For morphometric analysis and MSM estimate, the following structures were measured: the carapace (CW) and abdomen width (AW), the left and right cheliped propodus length (LPL and RPL) and height (LPH and RPH) for both sexes, and the gonopodium length (GL) for males. No heterochely was observed for both sexes, but the propodus dimensions showed sexual dimorphism. Males attain MSM at 44.71 mm CW and females at 41.87 mm CW. Males and females showed higher growth rates in GL and AW, respectively, in the juvenile stage, suggesting a greater investment in the development of secondary sexual characteristics before MSM. The present study provides information on the growth pattern of the species, which is significant to the community structure of fishing areas and serves as a parameter for evaluating protective measures that have been implemented.
{"title":"Relative growth and morphological sexual maturity of the crab Hepatus pudibundus (Herbst, 1785) (Decapoda: Aethridae) in southeast Brazil","authors":"Milena Silva Jaconis, C. S. Nogueira, Gabriel Vieira Martins Rezende-Gois, J. F. Perroca, R. C. Costa","doi":"10.1080/07924259.2022.2142485","DOIUrl":"https://doi.org/10.1080/07924259.2022.2142485","url":null,"abstract":"ABSTRACT The crab Hepatus pudibundus is a bycatch of the shrimp fishing industry, and despite having no commercial value, it is impacted by fishing activities. In this way, research about relative growth and sexual maturity can help to understand the life cycle of fisheries-affected species. Thus, the present study aimed to estimate morphological sexual maturity (MSM) and analyse the relative growth of a population of H. pudibundus. For morphometric analysis and MSM estimate, the following structures were measured: the carapace (CW) and abdomen width (AW), the left and right cheliped propodus length (LPL and RPL) and height (LPH and RPH) for both sexes, and the gonopodium length (GL) for males. No heterochely was observed for both sexes, but the propodus dimensions showed sexual dimorphism. Males attain MSM at 44.71 mm CW and females at 41.87 mm CW. Males and females showed higher growth rates in GL and AW, respectively, in the juvenile stage, suggesting a greater investment in the development of secondary sexual characteristics before MSM. The present study provides information on the growth pattern of the species, which is significant to the community structure of fishing areas and serves as a parameter for evaluating protective measures that have been implemented.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44155240","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: 10.1080/07924259.2022.2136015
K. P. Singh, Rahul Maddheshiya
ABSTRACT Sarcophaga ruficornis (Fabricius 1794) causes myiasis in humans and other vertebrates. It has a wide distribution across tropical countries. In the present investigation, the effect of a juvenile hormone analogue, fenoxycarb has been observed on the last instar larvae of S. ruficornis. The last instar larvae (0, 1 and 2-days old) of this dipteran fly were treated topically with sub-lethal doses (10, 20, 40, 60 and 80 µg/µl/larva) of fenoxycarb. Several effects were observed such as mortality, abnormal pupariation, reduction pupariation, adult emergence and eclosion failure. Pupal-adult intermediates and the emergence of abnormal adults were also observed. Log Inhibitory concentration (LogIC50) causing inhibition of normal pupariation was 1.68, 1.8 and 1.681 µg/µl in 0, 1 and 2-days of larval treatments respectively. Whereas LogIC50 values inhibiting the adult emergence were 1.297, 1.359 and 1.482 µg/µl in 0, 1, and 2-days of larval treatments respectively. Results manifest the potency of fenoxycarb in the control of larval-adult transformation in S. ruficornis.
{"title":"‘Insecticidal efficacy of a hormonal analogue on the post-embryonic development of a flesh fly, Sarcophaga ruficornis (Diptera: Sarcophagidae)’","authors":"K. P. Singh, Rahul Maddheshiya","doi":"10.1080/07924259.2022.2136015","DOIUrl":"https://doi.org/10.1080/07924259.2022.2136015","url":null,"abstract":"ABSTRACT Sarcophaga ruficornis (Fabricius 1794) causes myiasis in humans and other vertebrates. It has a wide distribution across tropical countries. In the present investigation, the effect of a juvenile hormone analogue, fenoxycarb has been observed on the last instar larvae of S. ruficornis. The last instar larvae (0, 1 and 2-days old) of this dipteran fly were treated topically with sub-lethal doses (10, 20, 40, 60 and 80 µg/µl/larva) of fenoxycarb. Several effects were observed such as mortality, abnormal pupariation, reduction pupariation, adult emergence and eclosion failure. Pupal-adult intermediates and the emergence of abnormal adults were also observed. Log Inhibitory concentration (LogIC50) causing inhibition of normal pupariation was 1.68, 1.8 and 1.681 µg/µl in 0, 1 and 2-days of larval treatments respectively. Whereas LogIC50 values inhibiting the adult emergence were 1.297, 1.359 and 1.482 µg/µl in 0, 1, and 2-days of larval treatments respectively. Results manifest the potency of fenoxycarb in the control of larval-adult transformation in S. ruficornis.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41601322","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 : 2022-09-22DOI: 10.1080/07924259.2022.2125353
D. Aviz, Priscila Amorim Carmona, Ana Caroline de Castro Barbosa, Cléverson Rannieri Meira dos Santos
ABSTRACT In this study, aspects of the reproductive biology of a Uca maracoani population from northern Brazil were examined. Ovigerous females monthly captured from December 2013 to November 2015 were measured and dissected to count, collect morphometric data, and classify the eggs. Ovigerous females were encountered throughout the two-year period but were absent during the months with the highest rainfall and lowest salinity, which indicates a seasonal–continuous reproductive pattern. The fecundity varied from of 12,233 to 85,000 eggs per female, and mean was 36,840 ± 3,361 eggs. The egg size increased progressively and significantly over the course of embryonic development. We found a direct relationship between the size of the females and their fecundity, and a clear trend was seen in which the larger females produced more eggs with larger sizes, which increased less in size during embryonic development. The presence of early- and late-stage eggs together in the same ovigerous mass in a considerable number of the ovigerous females suggests multiple spawning. The fecundity of U. maracoani is greater than that of other Atlantic fiddler crab species, and its reproductive strategy ensures its survival in the estuaries of the Amazon coast, which are subject to considerable fluctuations in salinity.
{"title":"Fecundity and reproductive patterns of the fiddler crab Uca maracoani Latreille 1802-1803 in an Amazonian estuary in northern Brazil","authors":"D. Aviz, Priscila Amorim Carmona, Ana Caroline de Castro Barbosa, Cléverson Rannieri Meira dos Santos","doi":"10.1080/07924259.2022.2125353","DOIUrl":"https://doi.org/10.1080/07924259.2022.2125353","url":null,"abstract":"ABSTRACT In this study, aspects of the reproductive biology of a Uca maracoani population from northern Brazil were examined. Ovigerous females monthly captured from December 2013 to November 2015 were measured and dissected to count, collect morphometric data, and classify the eggs. Ovigerous females were encountered throughout the two-year period but were absent during the months with the highest rainfall and lowest salinity, which indicates a seasonal–continuous reproductive pattern. The fecundity varied from of 12,233 to 85,000 eggs per female, and mean was 36,840 ± 3,361 eggs. The egg size increased progressively and significantly over the course of embryonic development. We found a direct relationship between the size of the females and their fecundity, and a clear trend was seen in which the larger females produced more eggs with larger sizes, which increased less in size during embryonic development. The presence of early- and late-stage eggs together in the same ovigerous mass in a considerable number of the ovigerous females suggests multiple spawning. The fecundity of U. maracoani is greater than that of other Atlantic fiddler crab species, and its reproductive strategy ensures its survival in the estuaries of the Amazon coast, which are subject to considerable fluctuations in salinity.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42527619","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 : 2022-08-28DOI: 10.1080/07924259.2022.2115948
G. Nandy, G. Aditya
ABSTRACT The growth and reproduction of the graceful awl snail Allopeas gracile (Hutton 1834) (Gastropoda: Subulinidae) were evaluated in the laboratory. Observations on single individual and multiple individuals showed similar growth pattern fitted with the von Bertalanffy growth model. A fecundity schedule of the snail was constructed using the daily reproductive outputs of the snails in cohort and in isolated state. The net reproductive rate (R0) and the finite rate of increase (λ) of single individuals (R0 = 124.33 ± 14.67 SE, λ = 1.03 ± 0.003 SE) were lower than the individuals reared in cohort (R0 = 774.55 ± 147.49 SE, λ = 1.115 ± 0.006 SE). The generation time (Tc) of individuals in competition was 107.89 ± 7.92 SE days, while single individuals had longer generation time of 199.39 ± 7.24 SE days. The longevity, the shell size and the shell length, body weight and the fecundity of A. gracile exhibited correspondences as well as provided evidences of the tradeoff in the life history traits. Information on the growth and reproduction of the snail A. gracile will therefore be suitable to assess the life history feature and serves as an input for framing the strategies for its population regulation.
{"title":"Growth and reproduction in the land snail Allopeas gracile (Hutton 1834): a laboratory appraisal","authors":"G. Nandy, G. Aditya","doi":"10.1080/07924259.2022.2115948","DOIUrl":"https://doi.org/10.1080/07924259.2022.2115948","url":null,"abstract":"ABSTRACT The growth and reproduction of the graceful awl snail Allopeas gracile (Hutton 1834) (Gastropoda: Subulinidae) were evaluated in the laboratory. Observations on single individual and multiple individuals showed similar growth pattern fitted with the von Bertalanffy growth model. A fecundity schedule of the snail was constructed using the daily reproductive outputs of the snails in cohort and in isolated state. The net reproductive rate (R0) and the finite rate of increase (λ) of single individuals (R0 = 124.33 ± 14.67 SE, λ = 1.03 ± 0.003 SE) were lower than the individuals reared in cohort (R0 = 774.55 ± 147.49 SE, λ = 1.115 ± 0.006 SE). The generation time (Tc) of individuals in competition was 107.89 ± 7.92 SE days, while single individuals had longer generation time of 199.39 ± 7.24 SE days. The longevity, the shell size and the shell length, body weight and the fecundity of A. gracile exhibited correspondences as well as provided evidences of the tradeoff in the life history traits. Information on the growth and reproduction of the snail A. gracile will therefore be suitable to assess the life history feature and serves as an input for framing the strategies for its population regulation.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46621028","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 : 2022-07-29DOI: 10.1080/07924259.2022.2106904
K. Hamasaki, Sota Nishimoto, Shigeki Dan
ABSTRACT A season-independent juvenile supply system is required for developing the aquaculture of the red swamp crayfish Procambarus clarkii. The present study aimed to test if P. clarkii females can spawn multiple times under a constant temperature (25°C) and photoperiod (14 L: 10D) – conditions that are suitable for their reproduction. When a female developed glair glands on the underside of its uropods, it was paired with a single male for mating. Females that laid the first egg batch from the middle of July to the end of October were successively cultured; large proportions of individuals then rematured (76%) and laid a second egg batch (94%) from late September to early February. Although we finished the culture experiments in early February when all the test females had laid their second egg batch, a third spawning occurred in 27% of these females. Overall, the earlier the females spawned, the more egg batches they laid. Fecundity was correlated with female body size (postorbital carapace length) and decreased in accordance with spawning time. The egg development rate was very low in some females – probably depending on male fertility. We highlight future research subjects for developing a continuous breeding system in P. clarkii.
{"title":"Multiple spawning of the red swamp crayfish Procambarus clarkii (Decapoda: Cambaridae) under laboratory conditions","authors":"K. Hamasaki, Sota Nishimoto, Shigeki Dan","doi":"10.1080/07924259.2022.2106904","DOIUrl":"https://doi.org/10.1080/07924259.2022.2106904","url":null,"abstract":"ABSTRACT A season-independent juvenile supply system is required for developing the aquaculture of the red swamp crayfish Procambarus clarkii. The present study aimed to test if P. clarkii females can spawn multiple times under a constant temperature (25°C) and photoperiod (14 L: 10D) – conditions that are suitable for their reproduction. When a female developed glair glands on the underside of its uropods, it was paired with a single male for mating. Females that laid the first egg batch from the middle of July to the end of October were successively cultured; large proportions of individuals then rematured (76%) and laid a second egg batch (94%) from late September to early February. Although we finished the culture experiments in early February when all the test females had laid their second egg batch, a third spawning occurred in 27% of these females. Overall, the earlier the females spawned, the more egg batches they laid. Fecundity was correlated with female body size (postorbital carapace length) and decreased in accordance with spawning time. The egg development rate was very low in some females – probably depending on male fertility. We highlight future research subjects for developing a continuous breeding system in P. clarkii.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47541315","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 : 2022-07-27DOI: 10.1080/07924259.2022.2104660
Sampa Banerjee, S. Pramanik, G. Saha, G. Aditya
ABSTRACT Entomological monitoring of dengue vectors Aedes aegypti (Linnaeus, 1762) and Ae. albopictus (Skuse, 1894) (Diptera: Culicidae) provides crucial information on the life-history traits (LHTs). An assessment of the LHTs of Aedes mosquitoes was accomplished using randomly collected immature stages from various larval habitats of Kolkata, India. Out of 104 larval habitats ~43% were exclusive for Ae. aegypti, ~31% were exclusive for Ae. albopictus and ~26% were common for both the species. Both female and male Ae. aegypti were bigger than the equivalents of Ae. albopictus in terms of pupal weight, adult weight and wing length. All the LHTs were significantly (P < 0.05) correlated, and the sexual dimorphism was evident for both Aedes mosquitoes. In both the species, the fecundity (ln-transformed value; y) increased with the wing length (x) [for Ae. aegypti y = 1.012x+1.023, R2 = 0.455, and for Ae. albopictus y = 1.022x+1.083, R2 = 0.154]. A correspondence of the larval development and the adult traits was evident for both the Aedes mosquitoes. Incorporation of the life-history trait data with pupal productivity in the surveillance of the dengue vectors will enable precise predictions about the population abundance and possibility of disease transmission.
{"title":"Do field collected immature stages of Aedes mosquitoes exhibit correspondence of the life-history traits? Observations from Kolkata, India","authors":"Sampa Banerjee, S. Pramanik, G. Saha, G. Aditya","doi":"10.1080/07924259.2022.2104660","DOIUrl":"https://doi.org/10.1080/07924259.2022.2104660","url":null,"abstract":"ABSTRACT Entomological monitoring of dengue vectors Aedes aegypti (Linnaeus, 1762) and Ae. albopictus (Skuse, 1894) (Diptera: Culicidae) provides crucial information on the life-history traits (LHTs). An assessment of the LHTs of Aedes mosquitoes was accomplished using randomly collected immature stages from various larval habitats of Kolkata, India. Out of 104 larval habitats ~43% were exclusive for Ae. aegypti, ~31% were exclusive for Ae. albopictus and ~26% were common for both the species. Both female and male Ae. aegypti were bigger than the equivalents of Ae. albopictus in terms of pupal weight, adult weight and wing length. All the LHTs were significantly (P < 0.05) correlated, and the sexual dimorphism was evident for both Aedes mosquitoes. In both the species, the fecundity (ln-transformed value; y) increased with the wing length (x) [for Ae. aegypti y = 1.012x+1.023, R2 = 0.455, and for Ae. albopictus y = 1.022x+1.083, R2 = 0.154]. A correspondence of the larval development and the adult traits was evident for both the Aedes mosquitoes. Incorporation of the life-history trait data with pupal productivity in the surveillance of the dengue vectors will enable precise predictions about the population abundance and possibility of disease transmission.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45321262","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 : 2022-06-26DOI: 10.1080/07924259.2022.2090865
K. Mezali, Zineb Lebouazda, Hocine Benzait, D. Soualili
ABSTRACT This work aims to describe for the first time the reproductive biology of the red starfish Echinaster sepositus at the western region of Algeria (Mostaganem). The population of E. sepositus is characterized by a sex ratio of 1:2 (female: male). The relation between arm length and wet body weight indicate a negative allometric growth. Histological study reveals six stages of sexual maturity in females (I: development; II: pre-mature; III: mature; IV: partly spawned; V: post – spawning; VI: recovery) and five stages in males (I: development; II: pre-mature; III: mature; V: post-spawning; VI: recovery). The gonadosomatic index shows that there is only one spawning period per year, which happens from July to November. The gonadal maturity and gametogenesis of E. sepositus are correlated with the environmental factors namely temperature and photoperiod.
{"title":"Reproductive biology of the red starfish Echinaster sepositus (Echinodermata, Asteroidea) from the Algerian west coast","authors":"K. Mezali, Zineb Lebouazda, Hocine Benzait, D. Soualili","doi":"10.1080/07924259.2022.2090865","DOIUrl":"https://doi.org/10.1080/07924259.2022.2090865","url":null,"abstract":"ABSTRACT This work aims to describe for the first time the reproductive biology of the red starfish Echinaster sepositus at the western region of Algeria (Mostaganem). The population of E. sepositus is characterized by a sex ratio of 1:2 (female: male). The relation between arm length and wet body weight indicate a negative allometric growth. Histological study reveals six stages of sexual maturity in females (I: development; II: pre-mature; III: mature; IV: partly spawned; V: post – spawning; VI: recovery) and five stages in males (I: development; II: pre-mature; III: mature; V: post-spawning; VI: recovery). The gonadosomatic index shows that there is only one spawning period per year, which happens from July to November. The gonadal maturity and gametogenesis of E. sepositus are correlated with the environmental factors namely temperature and photoperiod.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46908485","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 : 2022-06-09DOI: 10.1080/07924259.2022.2082330
André O. Silva-Júnior, M. Seiter, André F.A. Lira, W. J. T. Pontes
ABSTRACT Nutritional stress in females may have adverse reproductive effects such as reduced fertility and high juvenile offspring mortality. In this study, we investigated the effects of dietary stress on the reproductive output of the scorpion Tityus pusillus Pocock, 1893, in which we tested the hypothesis that compared with well-fed females, those subjected to nutritional stress would have a longer gestational period, produce offspring of lower weight, and suffer higher rates of mortality rates. Females were mated and divided into two treatment groups: those fed weekly (n = 37) and those fed on alternate weeks (n = 43). Compared with the well-fed females, we observed higher mortality (81.4% vs. 59.5%), a longer gestational period (21.3 vs. 12.7 weeks), and a larger number of offspring, albeit with higher mortality (8 and 64.1% vs, 3.5 and 45.2%, respectively) in the less frequently fed females. However, litter weights in both groups were found to be similar (less fed: 0.013 g; well fed, 0.014 g). These findings reveal that nutritional stress causes changes in the progeny of inadequately fed T. pusillus females, thereby contributing to higher offspring mortality, and indicate that T. pusillus females vary their reproductive strategies depending on resource availability.
雌性营养不良可能对生殖产生不利影响，如生育力降低和幼崽死亡率高。在这项研究中，我们调查了饮食应激对1893年Tityus pusillus Pocock蝎子生殖输出的影响，在研究中，我们验证了一个假设，即与营养充足的雌性相比，遭受营养应激的雌性会有更长的妊娠期，产生更低体重的后代，并且死亡率更高。雌性交配后分为两组:每周喂食(n = 37)和隔周喂食(n = 43)。与喂养充足的雌性相比，我们观察到更高的死亡率(81.4% vs. 59.5%)，更长的妊娠期(21.3 vs. 12.7周)和更多的后代，尽管较少喂养的雌性死亡率更高(分别为8%和64.1% vs. 3.5%和45.2%)。然而，两组的窝重相近(少饲0.013 g;这些研究结果表明，营养应激会导致营养不足的雌性pusillus后代发生变化，从而导致后代死亡率更高，并表明pusillus雌性会根据资源的可用性改变其生殖策略。
{"title":"Effects of nutritional stress on reproductive output in the scorpion Tityus pusillus Pocock, 1893 (Scorpiones, Buthidae)","authors":"André O. Silva-Júnior, M. Seiter, André F.A. Lira, W. J. T. Pontes","doi":"10.1080/07924259.2022.2082330","DOIUrl":"https://doi.org/10.1080/07924259.2022.2082330","url":null,"abstract":"ABSTRACT Nutritional stress in females may have adverse reproductive effects such as reduced fertility and high juvenile offspring mortality. In this study, we investigated the effects of dietary stress on the reproductive output of the scorpion Tityus pusillus Pocock, 1893, in which we tested the hypothesis that compared with well-fed females, those subjected to nutritional stress would have a longer gestational period, produce offspring of lower weight, and suffer higher rates of mortality rates. Females were mated and divided into two treatment groups: those fed weekly (n = 37) and those fed on alternate weeks (n = 43). Compared with the well-fed females, we observed higher mortality (81.4% vs. 59.5%), a longer gestational period (21.3 vs. 12.7 weeks), and a larger number of offspring, albeit with higher mortality (8 and 64.1% vs, 3.5 and 45.2%, respectively) in the less frequently fed females. However, litter weights in both groups were found to be similar (less fed: 0.013 g; well fed, 0.014 g). These findings reveal that nutritional stress causes changes in the progeny of inadequately fed T. pusillus females, thereby contributing to higher offspring mortality, and indicate that T. pusillus females vary their reproductive strategies depending on resource availability.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47949839","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: 10.1080/07924259.2022.2070438
M. Cumplido, M. C. Damborenea, G. Bigatti
ABSTRACT The edible marine gastropod Trophon geversianus shows a large geographic distribution along the southern tip of South America, inhabiting both rocky intertidal and shallow subtidal zones, with distinct behavioural responses to environmental stressful conditions (desiccation, temperature amplitude and high irradiation). Nevertheless, its reproductive biology has been poorly reported to date. We studied the gametogenic cycle of an intertidal rocky shore population from northern Patagonia (Argentina), in order to investigate the relation between gonadal changes and seasonal environmental variables. Mature individuals were taken monthly during an annual reproductive season and processed by standard histology procedures (haematoxylin and eosin). Adults of T. geversianus registered different gonadal maturation stages along the year, showing a marked seasonal variation without a resting period. The highest gamete evacuation season in both sexes was registered when the environmental stress was minimum (winter), while a greater number of individuals with gonads in proliferation and growth were predominant during maximum environmental stress (summer). The reproduction pattern presented an extended period of evacuation and a short phase of non-evacuation, associated to drastic seasonal environmental changes in the intertidal zone of Atlantic Patagonia. This information is useful to protect the resource and assure the sustainability of intertidal populations.
{"title":"Gametogenic cycle of the marine gastropod Trophon geversianus in a harsh Patagonian intertidal environment","authors":"M. Cumplido, M. C. Damborenea, G. Bigatti","doi":"10.1080/07924259.2022.2070438","DOIUrl":"https://doi.org/10.1080/07924259.2022.2070438","url":null,"abstract":"ABSTRACT The edible marine gastropod Trophon geversianus shows a large geographic distribution along the southern tip of South America, inhabiting both rocky intertidal and shallow subtidal zones, with distinct behavioural responses to environmental stressful conditions (desiccation, temperature amplitude and high irradiation). Nevertheless, its reproductive biology has been poorly reported to date. We studied the gametogenic cycle of an intertidal rocky shore population from northern Patagonia (Argentina), in order to investigate the relation between gonadal changes and seasonal environmental variables. Mature individuals were taken monthly during an annual reproductive season and processed by standard histology procedures (haematoxylin and eosin). Adults of T. geversianus registered different gonadal maturation stages along the year, showing a marked seasonal variation without a resting period. The highest gamete evacuation season in both sexes was registered when the environmental stress was minimum (winter), while a greater number of individuals with gonads in proliferation and growth were predominant during maximum environmental stress (summer). The reproduction pattern presented an extended period of evacuation and a short phase of non-evacuation, associated to drastic seasonal environmental changes in the intertidal zone of Atlantic Patagonia. This information is useful to protect the resource and assure the sustainability of intertidal populations.","PeriodicalId":14482,"journal":{"name":"Invertebrate Reproduction & Development","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44123380","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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