Pub Date : 2023-02-27DOI: 10.1080/10236244.2023.2183859
C. Manfrin
{"title":"Marine Decapod Crustacea: A Guide to Families and Genera of the World is now out!","authors":"C. Manfrin","doi":"10.1080/10236244.2023.2183859","DOIUrl":"https://doi.org/10.1080/10236244.2023.2183859","url":null,"abstract":"","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"6 1","pages":"55 - 55"},"PeriodicalIF":1.0,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87413465","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 : 2023-02-12DOI: 10.1080/10236244.2023.2171876
Xuelei Chen, Tian Xu, H. Dowse, Yi Tao, C. Zeng, Fanyi Zhao, Haihui Ye, Donghui Guo
ABSTRACT Adopting circatidal vertical migration, catadromous crab megalopae use flood tide transport (FTT) to reach the settlement or nursery habitat and moult at a high rate that mismatches the low food-availability en route. To explain this “mismatch problem,” we hypothesize that besides development, starvation also affects megalopae’s transport so that the starved ones with low moulting possibility cannot succeed migration. The hypothesis was tested by studying how starvation affected rhythmic vertical migration of Chinese mitten crab (Eriocheir sinensis) megalopae. The findings support our hypothesis by showing that starvation weakened the vertical migration of the megalopae. The results also revealed that starvation caused the residual vertical migration of the megalopae to follow a circadian rhythm in addition to circatidal rhythm. We conclude that for catadromous crab megalopae, transport, just as development, is controlled by nutrition; and there exists a trade-off between the development and transport of Chinese mitten crab megalopae .
{"title":"Correlation between transport and moulting of catadromous crab megalopae: The effects of starvation on rhythmic vertical migration","authors":"Xuelei Chen, Tian Xu, H. Dowse, Yi Tao, C. Zeng, Fanyi Zhao, Haihui Ye, Donghui Guo","doi":"10.1080/10236244.2023.2171876","DOIUrl":"https://doi.org/10.1080/10236244.2023.2171876","url":null,"abstract":"ABSTRACT Adopting circatidal vertical migration, catadromous crab megalopae use flood tide transport (FTT) to reach the settlement or nursery habitat and moult at a high rate that mismatches the low food-availability en route. To explain this “mismatch problem,” we hypothesize that besides development, starvation also affects megalopae’s transport so that the starved ones with low moulting possibility cannot succeed migration. The hypothesis was tested by studying how starvation affected rhythmic vertical migration of Chinese mitten crab (Eriocheir sinensis) megalopae. The findings support our hypothesis by showing that starvation weakened the vertical migration of the megalopae. The results also revealed that starvation caused the residual vertical migration of the megalopae to follow a circadian rhythm in addition to circatidal rhythm. We conclude that for catadromous crab megalopae, transport, just as development, is controlled by nutrition; and there exists a trade-off between the development and transport of Chinese mitten crab megalopae .","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"89 1","pages":"1 - 18"},"PeriodicalIF":1.0,"publicationDate":"2023-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84479007","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 : 2022-11-02DOI: 10.1080/10236244.2022.2144735
Caroline Teixeira Bonifácio, C. O. Paranhos, I. F. Araujo Torres, R. K. Luz
ABSTRACT Males and females of various species spend energy on different activities throughout the day in their natural environment. Thus, the present study aimed to assess whether males and females of A. nyassae differ in learning and preferences through two experiments. Experiment 1 subjected animals to learning by association in a T-maze test. Experiment 2 subjected males and females to a preference test in a T-maze, with each tank arm receiving one of the two following positive stimuli: shelter or food. Experiment 1 found that both sexes were able to learn the association between neutral and positive stimuli. Experiment 2 found that, regardless of sex, the animals frequented more the arm with the presence of shelter. This study demonstrates that males and females of A. nyassae were able to learn the task of object and food association and also preferred to take shelter over eating, even after exposure to stress.
{"title":"Association learning and preference of females and males of the blue orchid, Aulonocara nyassae Regan, 1922 in a T-maze","authors":"Caroline Teixeira Bonifácio, C. O. Paranhos, I. F. Araujo Torres, R. K. Luz","doi":"10.1080/10236244.2022.2144735","DOIUrl":"https://doi.org/10.1080/10236244.2022.2144735","url":null,"abstract":"ABSTRACT Males and females of various species spend energy on different activities throughout the day in their natural environment. Thus, the present study aimed to assess whether males and females of A. nyassae differ in learning and preferences through two experiments. Experiment 1 subjected animals to learning by association in a T-maze test. Experiment 2 subjected males and females to a preference test in a T-maze, with each tank arm receiving one of the two following positive stimuli: shelter or food. Experiment 1 found that both sexes were able to learn the association between neutral and positive stimuli. Experiment 2 found that, regardless of sex, the animals frequented more the arm with the presence of shelter. This study demonstrates that males and females of A. nyassae were able to learn the task of object and food association and also preferred to take shelter over eating, even after exposure to stress.","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"33 1","pages":"145 - 158"},"PeriodicalIF":1.0,"publicationDate":"2022-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72752148","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 : 2022-10-19DOI: 10.1080/10236244.2022.2135438
S. Phuge, Sachin M. Gosavi, R. Pandit
ABSTRACT Prey animals use various signals to detect their predators and respond accordingly to enhance their survival. Since responding to a predator is costly, prey species may cut cost by using other strategies such as behavioural tactics, morphological changes, seeking natural refuge or unique habitat acquisition. Tadpoles of Microhyla nilphamariensis have a transparent body and live in a neustonic environment, which provides them protection against benthic predators. As a result, we investigated the predator detection mechanism in M. nilphamariensis tadpoles using different cues from an insect predator, dragonfly larvae, to determine if the presence of natural shelter and unique habitat acquisition influences the chemo-ecology of predator recognition in this species. We also exposed these tadpoles to active caged predators and a stress hormone, corticosterone (CORT) to study physiological mechanism underlying their behavioural anti-predator responses toward alarm cues. In the predator avoidance assay, M. nilphamariensis tadpoles did not respond to the predator using visual or chemical signals. The tadpoles did not change their activity in response to alarm, heterospecific, kairomones, and dietary cues released from the predator. Pre-conditioning of M. nilphamariensis tadpoles with caged predator and different concentrations of CORT also did not alter their activity in response to alarm cues. These results clearly demonstrated that neustonic tadpoles of M. nilphamariensis do not detect and respond to co-existing insect predator. We discuss these results in the context of unique habitat occupied by these prey tadpoles, the presence of alternate prey, and inherent factors such as transparent body.
{"title":"Neustonic tadpoles do not detect and respond to insect predator","authors":"S. Phuge, Sachin M. Gosavi, R. Pandit","doi":"10.1080/10236244.2022.2135438","DOIUrl":"https://doi.org/10.1080/10236244.2022.2135438","url":null,"abstract":"ABSTRACT Prey animals use various signals to detect their predators and respond accordingly to enhance their survival. Since responding to a predator is costly, prey species may cut cost by using other strategies such as behavioural tactics, morphological changes, seeking natural refuge or unique habitat acquisition. Tadpoles of Microhyla nilphamariensis have a transparent body and live in a neustonic environment, which provides them protection against benthic predators. As a result, we investigated the predator detection mechanism in M. nilphamariensis tadpoles using different cues from an insect predator, dragonfly larvae, to determine if the presence of natural shelter and unique habitat acquisition influences the chemo-ecology of predator recognition in this species. We also exposed these tadpoles to active caged predators and a stress hormone, corticosterone (CORT) to study physiological mechanism underlying their behavioural anti-predator responses toward alarm cues. In the predator avoidance assay, M. nilphamariensis tadpoles did not respond to the predator using visual or chemical signals. The tadpoles did not change their activity in response to alarm, heterospecific, kairomones, and dietary cues released from the predator. Pre-conditioning of M. nilphamariensis tadpoles with caged predator and different concentrations of CORT also did not alter their activity in response to alarm cues. These results clearly demonstrated that neustonic tadpoles of M. nilphamariensis do not detect and respond to co-existing insect predator. We discuss these results in the context of unique habitat occupied by these prey tadpoles, the presence of alternate prey, and inherent factors such as transparent body.","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"63 1","pages":"131 - 143"},"PeriodicalIF":1.0,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90371608","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 : 2022-09-06DOI: 10.1080/10236244.2022.2120816
T. V. Sikorskaya, E. Ermolenko, A. Boroda
ABSTRACT Extending our knowledge about the bleaching and recovery processes in octocorals can offer valuable insights to predict future reef responses to continuing climate change. The octocoral Sinularia heterospiculata was exposed to a heat stress (32°C) for 2 days and then recovered within 205 days. The coral’s response was assessed by measuring total lipids, chlorophylls , carotenoids, and relative endosymbiont density. During the bleaching period, the coral lost half of its dinoflagellate symbionts; during the recovery period, it could completely restore their population. Photosynthetic activity of dinoflagellate symbionts was reduced after 1 week of recovery. However, the level of lipids was stable. The contents of chlorophyll b after the 2-day bleaching period increased relative to their proportion in the endosymbionts, which may be associated with the chlorophyll repackaging and absorption of more light. The content of carotenoids increases, which is probably associated with the complementary function of carotenoids as antioxidants.
{"title":"Recovery of a symbiotic octocoral Sinularia heterospiculata after heat stress exposure","authors":"T. V. Sikorskaya, E. Ermolenko, A. Boroda","doi":"10.1080/10236244.2022.2120816","DOIUrl":"https://doi.org/10.1080/10236244.2022.2120816","url":null,"abstract":"ABSTRACT Extending our knowledge about the bleaching and recovery processes in octocorals can offer valuable insights to predict future reef responses to continuing climate change. The octocoral Sinularia heterospiculata was exposed to a heat stress (32°C) for 2 days and then recovered within 205 days. The coral’s response was assessed by measuring total lipids, chlorophylls , carotenoids, and relative endosymbiont density. During the bleaching period, the coral lost half of its dinoflagellate symbionts; during the recovery period, it could completely restore their population. Photosynthetic activity of dinoflagellate symbionts was reduced after 1 week of recovery. However, the level of lipids was stable. The contents of chlorophyll b after the 2-day bleaching period increased relative to their proportion in the endosymbionts, which may be associated with the chlorophyll repackaging and absorption of more light. The content of carotenoids increases, which is probably associated with the complementary function of carotenoids as antioxidants.","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"11 3 1","pages":"121 - 130"},"PeriodicalIF":1.0,"publicationDate":"2022-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84732423","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 : 2022-07-24DOI: 10.1080/10236244.2022.2104720
Tanguy Soulié, J. Engström-Öst, O. Glippa
ABSTRACT Climate change-induced salinity decrease is currently occurring in many estuarine coastal zones, due to increased outflow of freshwater. This freshening can be a problem for brackish-water animals, already living on the edge of their salinity tolerance. We measured oxygen consumption of common copepod Eurytemora affinis along a natural salinity gradient in the western Gulf of Finland. The salinity varied between 3 in the inner bay and 7 in the offshore area along the gradient, pH varied between 7.05 and 7.86. Our results show that respiration increased with decreasing salinity, as expected for a genus more commonly found in estuarine/saline waters, even if it has colonised brackish waters. Our results suggest that future decreasing salinity could enhance respiration rate, and so energy requirements, of large-bodied zooplankton in estuarine areas such as the Baltic Sea and could lead to lower food quality availability for coastal planktivorous fish, such as herring and sprat.
{"title":"Copepod oxygen consumption along a salinity gradient","authors":"Tanguy Soulié, J. Engström-Öst, O. Glippa","doi":"10.1080/10236244.2022.2104720","DOIUrl":"https://doi.org/10.1080/10236244.2022.2104720","url":null,"abstract":"ABSTRACT Climate change-induced salinity decrease is currently occurring in many estuarine coastal zones, due to increased outflow of freshwater. This freshening can be a problem for brackish-water animals, already living on the edge of their salinity tolerance. We measured oxygen consumption of common copepod Eurytemora affinis along a natural salinity gradient in the western Gulf of Finland. The salinity varied between 3 in the inner bay and 7 in the offshore area along the gradient, pH varied between 7.05 and 7.86. Our results show that respiration increased with decreasing salinity, as expected for a genus more commonly found in estuarine/saline waters, even if it has colonised brackish waters. Our results suggest that future decreasing salinity could enhance respiration rate, and so energy requirements, of large-bodied zooplankton in estuarine areas such as the Baltic Sea and could lead to lower food quality availability for coastal planktivorous fish, such as herring and sprat.","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"5 1","pages":"107 - 119"},"PeriodicalIF":1.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85314176","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 : 2022-07-08DOI: 10.1080/10236244.2022.2100772
Md Moshiur Rahman, Z. Ferdouse, Nazmir Nur, Md Nazrul Islam, M. Rouf, S. T. Arafat, Sheikh Mustafizur Rahman, Md. Mostafizur Rahman
ABSTRACT A study was conducted to investigate the effects of microplastics (<5 mm) and macroplastics (>5 mm) on some phenotypic traits of guppy (Poecilia reticulata). Juvenile male guppies, fed with a commercial diet, were reared for 70 days in aquariums under three different experimental treatments: 1) control (no plastic); 2) microplastic; and 3) macroplastic. The findings revealed that microplastic-treated males had significantly higher mortality, shorter standard length, smaller body area, a limited number of sperm bundles and sigmoid displays, and less sexual interest than macroplastic and no-plastic treated males. The analyses showed no significant variation in tail length, gonopodial thrusts, or different color patterns among the treatments. Taken together, these findings show how microplastic pollution can influence the survival, growth, and reproductive traits of a fish species; this must be considered seriously, as other aquatic animals could be saved by reducing the amount of plastic waste in different aquatic environments.
{"title":"Microplastic ingestion alters the expression of some sexually selected traits in a model fish guppy (Poecilia reticulata Peters 1859)","authors":"Md Moshiur Rahman, Z. Ferdouse, Nazmir Nur, Md Nazrul Islam, M. Rouf, S. T. Arafat, Sheikh Mustafizur Rahman, Md. Mostafizur Rahman","doi":"10.1080/10236244.2022.2100772","DOIUrl":"https://doi.org/10.1080/10236244.2022.2100772","url":null,"abstract":"ABSTRACT A study was conducted to investigate the effects of microplastics (<5 mm) and macroplastics (>5 mm) on some phenotypic traits of guppy (Poecilia reticulata). Juvenile male guppies, fed with a commercial diet, were reared for 70 days in aquariums under three different experimental treatments: 1) control (no plastic); 2) microplastic; and 3) macroplastic. The findings revealed that microplastic-treated males had significantly higher mortality, shorter standard length, smaller body area, a limited number of sperm bundles and sigmoid displays, and less sexual interest than macroplastic and no-plastic treated males. The analyses showed no significant variation in tail length, gonopodial thrusts, or different color patterns among the treatments. Taken together, these findings show how microplastic pollution can influence the survival, growth, and reproductive traits of a fish species; this must be considered seriously, as other aquatic animals could be saved by reducing the amount of plastic waste in different aquatic environments.","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"41 1","pages":"87 - 106"},"PeriodicalIF":1.0,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75456010","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 : 2022-07-04DOI: 10.1080/10236244.2022.2094793
S. Fadlaoui, M. Melhaoui
ABSTRACT This is the first study of the diet composition of the North African freshwater crab Potamon algeriense by examining stomach contents. Crabs were collected during 1 year, October 2018 to September 2019, from Oued Zegzel, a mountain stream in the Northeast of Morocco. From a total of 72 crabs captured, only 35 males and 30 females had stomach contents that could be analyzed. Diet composition analysis was carried out using the frequency of occurrence and the percentage point methods. Stomach content analysis showed that P. algeriense was found to be an opportunistic omnivore capable of ingesting both vegetal and animal materials, with a predominance of vegetal tissues. High values of the feeding index were observed from summer to late autumn; however, lower values were recorded during the wet season.
{"title":"Diet composition of the North African freshwater crab, Potamon algeriense (Bott, 1967) in Oued Zegzel (Northeast of Morocco)","authors":"S. Fadlaoui, M. Melhaoui","doi":"10.1080/10236244.2022.2094793","DOIUrl":"https://doi.org/10.1080/10236244.2022.2094793","url":null,"abstract":"ABSTRACT This is the first study of the diet composition of the North African freshwater crab Potamon algeriense by examining stomach contents. Crabs were collected during 1 year, October 2018 to September 2019, from Oued Zegzel, a mountain stream in the Northeast of Morocco. From a total of 72 crabs captured, only 35 males and 30 females had stomach contents that could be analyzed. Diet composition analysis was carried out using the frequency of occurrence and the percentage point methods. Stomach content analysis showed that P. algeriense was found to be an opportunistic omnivore capable of ingesting both vegetal and animal materials, with a predominance of vegetal tissues. High values of the feeding index were observed from summer to late autumn; however, lower values were recorded during the wet season.","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"7 1","pages":"73 - 86"},"PeriodicalIF":1.0,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73527680","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 : 2022-06-18DOI: 10.1080/10236244.2022.2089570
Qiwu Jiang, I. McGaw
ABSTRACT Climate change and anthropological activities have led to an expansion of hypoxia into the natural habitat of Cancer irroratus. In this study, we examined the effects of hypoxia and food deprivation state on food intake and subsequent gastric processing. Three different techniques were used to measure food intake. The gravimetric analysis of dry food pellets was the most accurate method. In severe hypoxia (20% oxygen), rock crabs reduced food intake, and more crabs refused to eat. Compared with fasted crabs, more starved crabs tended to eat in severe hypoxia. Subsequently, prolonged gastric emptying times paralleled the previously measured postprandial oxygen consumption in hypoxia. Starved crabs also exhibited slightly longer transit times for digesta compared with fasted crabs. These results suggest that although a trade-off may occur in starved rock crabs between the need to procure nutrients and deal with hypoxic stress, impaired digestive processing may still deleteriously affect these animals.
{"title":"Effects of food deprivation state on feeding behavior and gastric evacuation of rock crabs, Cancer irroratus, during hypoxia","authors":"Qiwu Jiang, I. McGaw","doi":"10.1080/10236244.2022.2089570","DOIUrl":"https://doi.org/10.1080/10236244.2022.2089570","url":null,"abstract":"ABSTRACT Climate change and anthropological activities have led to an expansion of hypoxia into the natural habitat of Cancer irroratus. In this study, we examined the effects of hypoxia and food deprivation state on food intake and subsequent gastric processing. Three different techniques were used to measure food intake. The gravimetric analysis of dry food pellets was the most accurate method. In severe hypoxia (20% oxygen), rock crabs reduced food intake, and more crabs refused to eat. Compared with fasted crabs, more starved crabs tended to eat in severe hypoxia. Subsequently, prolonged gastric emptying times paralleled the previously measured postprandial oxygen consumption in hypoxia. Starved crabs also exhibited slightly longer transit times for digesta compared with fasted crabs. These results suggest that although a trade-off may occur in starved rock crabs between the need to procure nutrients and deal with hypoxic stress, impaired digestive processing may still deleteriously affect these animals.","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"104 1","pages":"45 - 71"},"PeriodicalIF":1.0,"publicationDate":"2022-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88033836","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 : 2022-03-04DOI: 10.1080/10236244.2022.2047965
A. Vignatti, S. Echaniz, G. Cabrera
ABSTRACT Daphnia menucoensis is frequent in lakes of the central pampas and northern Patagonia in Argentina. It has ecological importance since its grazing on phytoplankton makes lake water transparent. As most of the information about the species comes from field studies, the objective was to determine the influence of salinity and temperature on its biology through laboratory bioassays. Treatments were carried out with 7, 12 and 17 g/L of salts at 15 and 22°C. Neonates were used and, every two days until their death, the medium was renewed; they were fed with Chlorella vulgaris, survivors and offspring were quantified and molts were measured. The optimal conditions were recorded with 12 and 7 g/L, at 15 and 22°C, respectively. In these combinations, the highest average longevity (33–35 days), number of molts (7–12), litters (2.50–4.07), offspring (27.70–26.20), and the largest specimens (> 3 mm) were recorded.
{"title":"Effects of salinity and temperature on the biology of Daphnia menucoensis Paggi, 1996 (Crustacea, Cladocera)","authors":"A. Vignatti, S. Echaniz, G. Cabrera","doi":"10.1080/10236244.2022.2047965","DOIUrl":"https://doi.org/10.1080/10236244.2022.2047965","url":null,"abstract":"ABSTRACT Daphnia menucoensis is frequent in lakes of the central pampas and northern Patagonia in Argentina. It has ecological importance since its grazing on phytoplankton makes lake water transparent. As most of the information about the species comes from field studies, the objective was to determine the influence of salinity and temperature on its biology through laboratory bioassays. Treatments were carried out with 7, 12 and 17 g/L of salts at 15 and 22°C. Neonates were used and, every two days until their death, the medium was renewed; they were fed with Chlorella vulgaris, survivors and offspring were quantified and molts were measured. The optimal conditions were recorded with 12 and 7 g/L, at 15 and 22°C, respectively. In these combinations, the highest average longevity (33–35 days), number of molts (7–12), litters (2.50–4.07), offspring (27.70–26.20), and the largest specimens (> 3 mm) were recorded.","PeriodicalId":18210,"journal":{"name":"Marine and Freshwater Behaviour and Physiology","volume":"15 1","pages":"21 - 33"},"PeriodicalIF":1.0,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88217340","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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