Influence of diet on the metabolic turnover of stable isotope ratios and fatty acids in the omnivorous shrimp Palaemon peringueyi
- Antonio, Emily S, Richoux, Nicole B
- Authors: Antonio, Emily S , Richoux, Nicole B
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478860 , vital:78232 , https://doi.org/10.1007/s00227-016-2930-y
- Description: Determination of the tissue turnover rates of natural tracers such as stable isotope ratios and fatty acids in an organism is a prerequisite for elucidating trophic interactions in ecological studies. We conducted a 72-day diet-switch experiment to quantify temporal fluctuations in the carbon and nitrogen stable isotope values and fatty acid profiles in the muscle tissues of an omnivorous shrimp Palaemon peringueyi. As the food source was switched from fresh seagrass to live Artemia, nonlinear models were used to calculate tracer turnover rates and their proportional contributions to growth and metabolism. Carbon half-life was faster (0.8 days) in seagrass-fed shrimps compared to Artemia-fed shrimps (231 days), whereas nitrogen turnover (0.7 days) and fatty acid turnover (1.5–4 days) showed faster half-lives in Artemia-fed shrimps. As the shrimps showed limited growth, most of the turnover of the tracer components was attributed to metabolism (>50 %). Fatty acids generally revealed faster half-lives (0.8–23 days) relative to stable isotope ratio half-lives (0.7–231 days), suggesting unequal efficiency of each tracer to elucidate temporal variations in the consumer’s diet. Our results have significant implications for temporal studies that use tracers, especially when consumers have the potential to change diets. Variations in the metabolic turnover rates of stable isotope ratios and fatty acids in the muscle tissues of the shrimp were largely driven by the quality of the food provided and revealed physiological flexibility in an omnivorous consumer.
- Full Text:
- Date Issued: 2016
- Authors: Antonio, Emily S , Richoux, Nicole B
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478860 , vital:78232 , https://doi.org/10.1007/s00227-016-2930-y
- Description: Determination of the tissue turnover rates of natural tracers such as stable isotope ratios and fatty acids in an organism is a prerequisite for elucidating trophic interactions in ecological studies. We conducted a 72-day diet-switch experiment to quantify temporal fluctuations in the carbon and nitrogen stable isotope values and fatty acid profiles in the muscle tissues of an omnivorous shrimp Palaemon peringueyi. As the food source was switched from fresh seagrass to live Artemia, nonlinear models were used to calculate tracer turnover rates and their proportional contributions to growth and metabolism. Carbon half-life was faster (0.8 days) in seagrass-fed shrimps compared to Artemia-fed shrimps (231 days), whereas nitrogen turnover (0.7 days) and fatty acid turnover (1.5–4 days) showed faster half-lives in Artemia-fed shrimps. As the shrimps showed limited growth, most of the turnover of the tracer components was attributed to metabolism (>50 %). Fatty acids generally revealed faster half-lives (0.8–23 days) relative to stable isotope ratio half-lives (0.7–231 days), suggesting unequal efficiency of each tracer to elucidate temporal variations in the consumer’s diet. Our results have significant implications for temporal studies that use tracers, especially when consumers have the potential to change diets. Variations in the metabolic turnover rates of stable isotope ratios and fatty acids in the muscle tissues of the shrimp were largely driven by the quality of the food provided and revealed physiological flexibility in an omnivorous consumer.
- Full Text:
- Date Issued: 2016
Tide-induced variations in the fatty acid composition of estuarine particulate organic matter
- Antonio, Emily S, Richoux, Nicole B
- Authors: Antonio, Emily S , Richoux, Nicole B
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/456336 , vital:75504 , xlink:href="https://doi.org/10.1007/s12237-015-0049-x"
- Description: The particulate organic matter (POM) in hydrodynamically variable habitats such as the lower reaches of estuaries can change in its content and quality on very short time scales (example, hourly), and these changes can potentially influence higher-level consumers in river-estuary-marine systems. Estuarine water samples were collected hourly for 12 h downstream in a small river to evaluate the fatty acid composition of POM over a tidal cycle. Fatty acid constituents of POM collected during the flood tide were dominated by the saturated, higher plant and bacterial fatty acids, whereas unsaturated, polyunsaturated, essential, and diatom-associated fatty acids dominated the POM collected during the ebb tide. Elevated algal biomass (as indicated by high chlorophyll a concentrations), diatom, and freshness indices in the POM indicated enhanced fresh autochthonous-origin materials that dominated the mixed organic pool during the ebb tide compared to more degraded detritus during the flood tide. Tidal retention of organic matter and algal primary production were the most influential factors that differentiated the fatty acid composition of estuarine POM over the short time scale. The results of this study have important implications on the quality of POM at the time of sampling, especially in estuaries where mixed organic pools have multiple inputs and are strongly influenced by tidal cycles.
- Full Text:
- Date Issued: 2016
- Authors: Antonio, Emily S , Richoux, Nicole B
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/456336 , vital:75504 , xlink:href="https://doi.org/10.1007/s12237-015-0049-x"
- Description: The particulate organic matter (POM) in hydrodynamically variable habitats such as the lower reaches of estuaries can change in its content and quality on very short time scales (example, hourly), and these changes can potentially influence higher-level consumers in river-estuary-marine systems. Estuarine water samples were collected hourly for 12 h downstream in a small river to evaluate the fatty acid composition of POM over a tidal cycle. Fatty acid constituents of POM collected during the flood tide were dominated by the saturated, higher plant and bacterial fatty acids, whereas unsaturated, polyunsaturated, essential, and diatom-associated fatty acids dominated the POM collected during the ebb tide. Elevated algal biomass (as indicated by high chlorophyll a concentrations), diatom, and freshness indices in the POM indicated enhanced fresh autochthonous-origin materials that dominated the mixed organic pool during the ebb tide compared to more degraded detritus during the flood tide. Tidal retention of organic matter and algal primary production were the most influential factors that differentiated the fatty acid composition of estuarine POM over the short time scale. The results of this study have important implications on the quality of POM at the time of sampling, especially in estuaries where mixed organic pools have multiple inputs and are strongly influenced by tidal cycles.
- Full Text:
- Date Issued: 2016
Trophodynamics of three decapod crustaceans in a temperate estuary using stable isotope and fatty acid analyses
- Antonio, Emily S, Richoux, Nicole B
- Authors: Antonio, Emily S , Richoux, Nicole B
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478894 , vital:78237 , https://doi.org/10.3354/meps10761
- Description: Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crustacean species and their potential food sources in a temperate estuary. We hypothesized that the shrimp Palaemon peringueyi, the mud prawn Upogebia africana and the sand prawn Callichirus kraussi have disparate diets due to interspecific differences in metabolism and feeding mode and that diets of the crustaceans all change temporally due to variations in available food. The species with the most variable diet was expected to have the greatest niche differentiation. We sampled the 3 crustaceans and their food sources on occasions spanning 4 seasons. The diet of P. peringueyi changed from a dominance of benthic microalgae in spring and winter to increased contributions of particulate organic matter (POM) in summer, with preferential sequestration of 22: 6ω3. U. africana showed a stable dependence on estuarine POM as the main source of its energy, while C. kraussi relied more on marine POM, except in winter, when benthic microalgae was an important energy source. The 2 infaunal prawns showed elevated proportions of 16: 1ω7 and 20: 5ω3 throughout most of the year, probably originating from diatoms. P. peringueyi showed a different preferred diet than the 2 prawns, resulting in an isotopic niche segregation from the infaunal prawns, but the fatty acid niche of the shrimp overlapped with the prawns. Stable isotope values revealed the temporal variations in the origins and proportions of different food sources contributing to the diet of each species, while fatty acid data provided information on finer-scale trophic interactions. Temporal variations in estuarine consumer diets should be considered in estuarine food web studies whenever possible.
- Full Text:
- Date Issued: 2014
- Authors: Antonio, Emily S , Richoux, Nicole B
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478894 , vital:78237 , https://doi.org/10.3354/meps10761
- Description: Temporal variations in stable isotope ratios and fatty acid composition were examined in 3 crustacean species and their potential food sources in a temperate estuary. We hypothesized that the shrimp Palaemon peringueyi, the mud prawn Upogebia africana and the sand prawn Callichirus kraussi have disparate diets due to interspecific differences in metabolism and feeding mode and that diets of the crustaceans all change temporally due to variations in available food. The species with the most variable diet was expected to have the greatest niche differentiation. We sampled the 3 crustaceans and their food sources on occasions spanning 4 seasons. The diet of P. peringueyi changed from a dominance of benthic microalgae in spring and winter to increased contributions of particulate organic matter (POM) in summer, with preferential sequestration of 22: 6ω3. U. africana showed a stable dependence on estuarine POM as the main source of its energy, while C. kraussi relied more on marine POM, except in winter, when benthic microalgae was an important energy source. The 2 infaunal prawns showed elevated proportions of 16: 1ω7 and 20: 5ω3 throughout most of the year, probably originating from diatoms. P. peringueyi showed a different preferred diet than the 2 prawns, resulting in an isotopic niche segregation from the infaunal prawns, but the fatty acid niche of the shrimp overlapped with the prawns. Stable isotope values revealed the temporal variations in the origins and proportions of different food sources contributing to the diet of each species, while fatty acid data provided information on finer-scale trophic interactions. Temporal variations in estuarine consumer diets should be considered in estuarine food web studies whenever possible.
- Full Text:
- Date Issued: 2014
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