The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Camille Albouy - One of the best experts on this subject based on the ideXlab platform.
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From the cradle to the grave: Green turtle hatchlings (Chelonia mydas) preyed upon by two-spots red Snappers (Lutjanus bohar)
Food Webs, 2019Co-Authors: Jean-baptiste Juhel, Eva Maire, Elliott Sucre, Marie-charlotte Cheutin, Virginie Marquès, Cassandra Benkwitt, Rachel Gunn, Eilísh Richards, Camille AlbouyAbstract:The observation of trophic interactions such as predation provide valuable information to model food webs and better understand ecosystem functioning. Such information is crucial for rare and endangered species in order to adapt management measures and ensure their conservation. However, trophic interactions are rarely observed in the marine realm, even for well-known or widespread species. During a scientific cruise in the Scattered Islands (Southwestern Indian Ocean), we observed endangered green turtle hatchlings (Chelonia mydas) in the gut content of two subadults two-spots red Snappers (Lutjanus bohar). This trophic link involving emblematic species has not been previously described. The two-spots red Snapper is a widespread coral reef fish in the tropical Indo-Pacific. Although it is unclear how fish predation affects marine turtle population dynamics, the occurrence of hatchlings in all the Snapper samples suggests that fish could be significant sources of predation. Yet this predation pressure remains to be further studied and quantified to be considered in marine turtle population monitoring.
Sean P Powers - One of the best experts on this subject based on the ideXlab platform.
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red Snapper distribution on natural habitats and artificial structures in the northern gulf of mexico
Marine and Coastal Fisheries: Dynamics Management and Ecosystem Science, 2017Co-Authors: Mandy Karnauskas, Marcus J Drymon, John F Walter, Matthew D Campbell, Adam G Pollack, Sean P PowersAbstract:AbstractIn 2011, an intensive, multiple-gear, fishery-independent survey was carried out in the northern Gulf of Mexico (GOM) to collect comprehensive age and length information on Red Snapper Lutjanus campechanus. Based on this synoptic survey, we produced a spatial map of Red Snapper relative abundance that integrates both gear selectivity effects and ontogenetically varying habitat usage. Our methodology generated a spatial map of Red Snapper at a 10-km2 grid resolution that is consistent with existing knowledge of the species: Red Snapper occurred in relatively high abundances at depths of 50–90 m along the coasts of Texas and Louisiana and in smaller, patchy “hot spots” at a variety of depths along the Alabama coast and the west Florida shelf. Red Snapper biomass and fecundity estimates were higher for the northwestern GOM than for the northeastern GOM, as the latter area contained mostly smaller, younger individuals. The existence of similar surveys on petroleum platforms and artificial reefs also e...
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spatial and dietary overlap creates potential for competition between red Snapper lutjanus campechanus and vermilion Snapper rhomboplites aurorubens
PLOS ONE, 2015Co-Authors: William T. Davis, Marcus J Drymon, Sean P PowersAbstract:Understanding the complex nature of direct and indirect species interactions is a critical precursor to successful resource management. In the northern Gulf of Mexico fisheries ecosystem, red Snapper (Lutjanus campechanus) and vermilion Snapper (Rhomboplites aurorubens) are two commercially harvested species within a larger reef fish complex. These two species share similar habitats and diets; however, little is known about how these species partition habitat and dietary resources. In this study we examined the extent of spatial and dietary overlap between red Snapper and vermilion Snapper, and experimentally compared their feeding behavior. Field data from multiple gear types demonstrates that red Snapper and vermilion Snapper frequently cohabited reefs in the northern Gulf of Mexico, and Pianka’s niche overlap indices suggest significantly overlapping diets. Experimental manipulations show that red Snapper are the dominant forager of the two species, as red Snapper foraging alone ate more shrimp per fish than vermilion Snapper in both the single species (p = 0.003) and mixed species (p = 0.02) treatments. In addition, red Snapper ate significantly more shrimp per fish in the mixed species treatment than in the single species treatment (p = 0.04). Vermilion Snapper shrimp consumption per fish did not differ significantly between mixed and single species treatments. Cumulatively, our results suggest that spatial and dietary overlap could lead to competition between red and vermilion Snapper in the study area; however, conclusively determining the existence of such competition would require further research.
Mohd Zamri Saad - One of the best experts on this subject based on the ideXlab platform.
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the presence of vibrionaceae betanodavirus and iridovirus in marine cage cultured fish role of fish size water physicochemical parameters and relationships among the pathogens
Aquaculture Reports, 2017Co-Authors: Azila Abdullah, Rimatulhana Ramli, Mohd Syafiq Mohammad Ridzuan, Munira Murni, Shahidan Hashim, Fahmi Sudirwan, Siti Zahrah Abdullah, Nur Nazifah Mansor, Sofea Amira, Mohd Zamri SaadAbstract:The study determines the presence of Vibrionaceae, Betanodavirus and Iridovirus in marine cage-cultured fish, while identifying the roles of fish size, water physicochemical parameters and relationships among the pathogens itself. Cultured grouper and Snapper were randomly sampled from a commercial fish farm between February and December 2014. The total body weight and length of individual fish were measured. The kidney, liver and spleen were sampled for bacteria isolation, while for viral identification, the sample of brain, eye, kidney and spleen were used. Water physicochemical parameters during the sampling activities were also determined. Laboratory results revealed isolations of multiple pathogens including Vibrio alginolyticus, V. vulnificus, Photobacterium damselae subsp. damselae (PD), Nervous Necrosis Virus (NNV) and Iridovirus (IV) at low to high prevalence throughout the study period. The weight of affected groupers ranged between 98 g and 719 g, while Snappers between 67 g and 982 g. There was a weak and moderate negative correlation between the grouper’s weight and the presence of NNV (R = −0.3684; P 0.05) difference was noted in the rate of isolated pathogens between groupers and Snappers, and between the pathogens affecting Snappers. However, detection of IV in groupers was significantly (P < 0.05) higher than V. alginolyticus, V. vulnificus and PD. Isolations of V. vulnificus in groupers showed strong and moderate positive correlations with isolations of PD (R = 0.7069; P < 0.05) and IV (R = 0.6665; P < 0.05), respectively. In Snappers, there was strong positive correlation between isolation of V. alginolyticus and NNV (R = 0.7526; P < 0.05). Multivariate analyses showed that water temperature, dissolved oxygen, ammonia, iron and nitrite were the most significant water physicochemical parameters associated with presence of these pathogens.
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The presence of Vibrionaceae, Betanodavirus and Iridovirus in marine cage-cultured fish: Role of fish size, water physicochemical parameters and relationships among the pathogens
Elsevier, 2017Co-Authors: Azila Abdullah, Rimatulhana Ramli, Mohd Syafiq Mohammad Ridzuan, Munira Murni, Shahidan Hashim, Fahmi Sudirwan, Siti Zahrah Abdullah, Nur Nazifah Mansor, Sofea Amira, Mohd Zamri SaadAbstract:The study determines the presence of Vibrionaceae, Betanodavirus and Iridovirus in marine cage-cultured fish, while identifying the roles of fish size, water physicochemical parameters and relationships among the pathogens itself. Cultured grouper and Snapper were randomly sampled from a commercial fish farm between February and December 2014. The total body weight and length of individual fish were measured. The kidney, liver and spleen were sampled for bacteria isolation, while for viral identification, the sample of brain, eye, kidney and spleen were used. Water physicochemical parameters during the sampling activities were also determined. Laboratory results revealed isolations of multiple pathogens including Vibrio alginolyticus, V. vulnificus, Photobacterium damselae subsp. damselae (PD), Nervous Necrosis Virus (NNV) and Iridovirus (IV) at low to high prevalence throughout the study period. The weight of affected groupers ranged between 98 g and 719 g, while Snappers between 67 g and 982 g. There was a weak and moderate negative correlation between the grouper’s weight and the presence of NNV (R = −0.3684; P
William T. Davis - One of the best experts on this subject based on the ideXlab platform.
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spatial and dietary overlap creates potential for competition between red Snapper lutjanus campechanus and vermilion Snapper rhomboplites aurorubens
PLOS ONE, 2015Co-Authors: William T. Davis, Marcus J Drymon, Sean P PowersAbstract:Understanding the complex nature of direct and indirect species interactions is a critical precursor to successful resource management. In the northern Gulf of Mexico fisheries ecosystem, red Snapper (Lutjanus campechanus) and vermilion Snapper (Rhomboplites aurorubens) are two commercially harvested species within a larger reef fish complex. These two species share similar habitats and diets; however, little is known about how these species partition habitat and dietary resources. In this study we examined the extent of spatial and dietary overlap between red Snapper and vermilion Snapper, and experimentally compared their feeding behavior. Field data from multiple gear types demonstrates that red Snapper and vermilion Snapper frequently cohabited reefs in the northern Gulf of Mexico, and Pianka’s niche overlap indices suggest significantly overlapping diets. Experimental manipulations show that red Snapper are the dominant forager of the two species, as red Snapper foraging alone ate more shrimp per fish than vermilion Snapper in both the single species (p = 0.003) and mixed species (p = 0.02) treatments. In addition, red Snapper ate significantly more shrimp per fish in the mixed species treatment than in the single species treatment (p = 0.04). Vermilion Snapper shrimp consumption per fish did not differ significantly between mixed and single species treatments. Cumulatively, our results suggest that spatial and dietary overlap could lead to competition between red and vermilion Snapper in the study area; however, conclusively determining the existence of such competition would require further research.
Jean-baptiste Juhel - One of the best experts on this subject based on the ideXlab platform.
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From the cradle to the grave: Green turtle hatchlings (Chelonia mydas) preyed upon by two-spots red Snappers (Lutjanus bohar)
Food Webs, 2019Co-Authors: Jean-baptiste Juhel, Eva Maire, Elliott Sucre, Marie-charlotte Cheutin, Virginie Marquès, Cassandra Benkwitt, Rachel Gunn, Eilísh Richards, Camille AlbouyAbstract:The observation of trophic interactions such as predation provide valuable information to model food webs and better understand ecosystem functioning. Such information is crucial for rare and endangered species in order to adapt management measures and ensure their conservation. However, trophic interactions are rarely observed in the marine realm, even for well-known or widespread species. During a scientific cruise in the Scattered Islands (Southwestern Indian Ocean), we observed endangered green turtle hatchlings (Chelonia mydas) in the gut content of two subadults two-spots red Snappers (Lutjanus bohar). This trophic link involving emblematic species has not been previously described. The two-spots red Snapper is a widespread coral reef fish in the tropical Indo-Pacific. Although it is unclear how fish predation affects marine turtle population dynamics, the occurrence of hatchlings in all the Snapper samples suggests that fish could be significant sources of predation. Yet this predation pressure remains to be further studied and quantified to be considered in marine turtle population monitoring.
