Origin of resources and trophic pathways in a large SW Atlantic estuary: An evaluation using stable isotopes

Botto, Florencia; Gaitán, Esteban; Mianzán, Hermes; Acha, Marcelo; Giberto, Diego; Schiariti, Agustín; Iribarne, Oscar

doi:10.1016/j.ecss.2010.12.014

Cited by 59 publications

(68 citation statements)

References 57 publications

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“…Although Botto et al (2011) did not analyzed differences in isotope values between distinct sizes classes, similar results were found in C. guatucupa from the Rio de la Plata Estuary as adults had significant higher δ 15 N values than juveniles but not differences in δ 13 C were observed.…”

Section: Discussionmentioning

confidence: 51%

“…In these models, we used data of main prey obtained in stomach contents by Sardiña and Lopez Cazorla (2005) adjacent to the study area. Isotope values of prey published for SWACE were used in the models, which included one species of mysid Neomysis americana (Smith 1873) and the sergestid Peisos petrunkevitchi (Burkenroad 1945) (Ciancio et al, 2008;Botto et al, 2011). Isotope values of Engraulis anchoita from the study area (Bahía Blanca estuary) were determined in this study.…”

Section: Discussionmentioning

confidence: 99%

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Variation in the isotopic composition of striped weakfish Cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts

et al. 2017

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The aim of this study was to analyze the isotopic composition in muscle of striped weakfish Cynoscion guatucupa from Southwest Atlantic Ocean in order to evaluate a possible variation in δ 13 C and δ 15 N in response to dietary shifts that occur as animals grow. We also explored for isotopic evidence of differences between sample locations. The results showed an agreement between isotope analysis and previous conventional studies. Differences in the isotope composition between sampling location were not observed. A positive relation exists between isotope values and total body length of the animals. The Cluster analysis defined three groups of size classes, validated by the MDS. Differences in the relative consumption of prey species in each size class were also observed performing isotope mixing models (SIAR). Variation in δ 15 N among size classes would be associated with the consumption of a different type of prey as animals grow. Small striped weakfish feed on small crustaceans and progressively increase their consumption of fish (anchovy, Engraulis anchoita), increasing by this way their isotope values. On the other hand, differences in δ 13 C values seemed to be related to age-class specific spatial distribution patterns. Therefore, large and small striped weakfish remain specialized but feeding on different prey at different trophic levels. These results contribute to the study of the diet of striped weakfish, improve the isotopic ecology models and highlight on the importance of accounting for variation in the isotopic composition in response to dietary shifts with the size of one of the most important fishery resources in the region.Keywords: Cynoscion guatucupa, stable isotopes, diet, ontogenetic shifts, Southwest Atlantic Coastal Ecosystem. Variação na composição isotópica do

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Section: Discussionmentioning

confidence: 51%

Section: Discussionmentioning

confidence: 99%

Variation in the isotopic composition of striped weakfish Cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts

et al. 2017

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“…This result suggests the western Atlantic nesting colonies (Suriname, French Guyana, and Brazil) may be a main contributors of L. olivacea along the southwestern Atlantic. Furthermore, the turtles recorded in this study were subadults and adults, and thus able to swim independently of oceanic currents and cover large distances in search of feeding areas such as the Rio de la Plata and adjacent waters, which is considered as a key foraging ground for many marine species (Brazeiro et al 2003, López-Mendilaharsu 2009, Botto et al 2011, González-Carman et al 2011. This fact and the increase in population numbers at nesting colonies in Brazil (Silva et al 2007), suggest that these new records represent a possible expansion of this population towards the southern latitudes.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, this area is influenced by a subtropical convergence, a junction of 2 ocean currents, a warm water current from Brazil and a cold water current from Malvinas (Palma et al 2009). The convergence of water masses, along with the halocline, allows for high biological productivity in Uruguayan coastal waters (Brazeiro et al 2003, López-Mendilaharsu 2009, Botto et al 2011, González-Carman et al 2011.…”

Section: Methodsmentioning

confidence: 99%

New records of Lepidochelys olivacea (Eschscholtz, 1829) (Testudines, Cheloniidae) provide evidence that Uruguayan waters are the southernmost limit of distribution for the species in the western Atlantic Ocean

González-Paredes¹,

Vélez-Rubio²,

Hahn³

et al. 2017

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We report 8 new records of Lepidochelys olivacea marine turtle in the Uruguayan waters, indicating this area as the southernmost limit of distribution for this species in the western Atlantic Ocean. In addition, 1 specimen was subjected to genetic analysis, revealing its population origin in the western Atlantic nesting colonies (Surinam, French Guiana, and Brazil). This report represents an update of the distribution of L. olivacea in the southwestern Atlantic and provides insight into the morphological and genetic characterization of the species at temperate waters.

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“…Numerous studies have examined the diet and trophic position of elasmobranchs in a food web context using stable isotope analysis, ranging from investigations of dietary niche overlap in elasmobranch mesopredators (Vaudo and Heithaus 2011), contributions of different primary production sources to communities (Botto et al 2011;Davenport and Bax 2002), community-wide trophic structure analysis (Davenport and Bax 2002;Revill et al 2009;Boyle et al 2012), changes in assemblages over time Jennings et al 2002) and with other environmental variables (Polunin et al 2001). Many of these studies collected the first stable isotope data for certain species and regions and can therefore serve as important baseline information.…”

Section: Diet and Trophic Structurementioning

confidence: 99%

Stable isotope analysis as a tool for elasmobranch conservation research: a primer for non-specialists

Shiffman

Gallagher

Boyle

et al. 2012

Mar. Freshwater Res.

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Many elasmobranch species are undergoing population declines on a global scale; however, implementation of effective conservation and management strategies is hindered, to a large extent, by a lack of sufficient data on diet, life history and behaviour. This work is a primer of how stable isotope analysis can be used as a cost-effective, relatively simple tool for examining resource use patterns (e.g. diet, habitat) and generating relevant data in support of science-based elasmobranch conservation and management. Specifically, isotopes can resolve the feeding niches of elasmobranchs, detect ontogenetic trophic shifts and calculate relative diet breadth of different species. Stable isotope analysis can also be employed to investigate the extent of anthropogenic impacts on diet or to infer the source of toxins affecting elasmobranchs. Additionally, this tool can be used to study migration patterns and habitat usage. Depending on the tissue analysed, this technique can also be non-lethal and minimally invasive. The limitations of stable isotope analysis are discussed, and recommendations for future work are presented.

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Origin of resources and trophic pathways in a large SW Atlantic estuary: An evaluation using stable isotopes

Cited by 59 publications

References 57 publications

Variation in the isotopic composition of striped weakfish Cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts

Variation in the isotopic composition of striped weakfish Cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts

New records of Lepidochelys olivacea (Eschscholtz, 1829) (Testudines, Cheloniidae) provide evidence that Uruguayan waters are the southernmost limit of distribution for the species in the western Atlantic Ocean

Stable isotope analysis as a tool for elasmobranch conservation research: a primer for non-specialists

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Origin of resources and trophic pathways in a large SW Atlantic estuary: An evaluation using stable isotopes

Cited by 59 publications

References 57 publications

Variation in the isotopic composition of striped weakfish Cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts

Variation in the isotopic composition of striped weakfish Cynoscion guatucupa of the Southwest Atlantic Ocean in response to dietary shifts

New records of Lepidochelys olivacea (Eschscholtz, 1829)&nbsp;(Testudines, Cheloniidae) provide evidence that Uruguayan waters&nbsp;are the southernmost limit of distribution for the species in the&nbsp;western Atlantic Ocean

Stable isotope analysis as a tool for elasmobranch conservation research: a primer for non-specialists

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New records of Lepidochelys olivacea (Eschscholtz, 1829) (Testudines, Cheloniidae) provide evidence that Uruguayan waters are the southernmost limit of distribution for the species in the western Atlantic Ocean