Intraspecific food resource partitioning in Brazilian silverside Atherinella brasiliensis (Atheriniformes: Atherinopsidae) in a tropical estuary, Brazil

Brito, Gitá Juan Soterorudá; Lima, Lidiane Gomes de; Oliveira, Ronnie Enderson Mariano Carvalho Cunha; Pessanha, André Luiz Machado

doi:10.1590/1982-0224-20180108

Cited by 7 publications

(4 citation statements)

References 51 publications

(59 reference statements)

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“…This change in dietary composition throughout ontogeny could also be a strategy to minimize the overlap of trophic niche between different age groups for E. desantanai. Other studies have reported on the sharing of food resources in fish (Zaret & Rand, 1971;Brito et al, 2019). Therefore, in addition to being influenced by the morphometric characteristics of the organisms, dietary changes throughout ontogeny can also be explained by differences in energy content, as well as by mechanisms to avoid intraspecific competition.…”

Section: Discussionmentioning

confidence: 99%

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Gouveia¹,

Rondon

Súarez

2022

Acta Limnol. Bras.

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Aim This study investigated changes in the dietary composition and trophic niche breadth of Eigenmannia desantanai in the context of hydrological periods, rivers, and ontogeny. Methods Collections were performed monthly on the Paraguay and Amonguijá Rivers between February 2009 and January 2011. Results A total of 338 specimens of E. desantanai were collected, 224 of which came from the Amonguijá River and 114 from the Paraguay River. In all, 21 food items were identified. Fully remains of digested animals (RDA), Chironomidae, Cladocera, and Ostracoda showed greater importance in the diet of E. desantanai. Dietary composition was influenced by hydrological periods, followed by differences between sampled rivers, and ontogeny. In contrast, only hydrological periods explained variation in the E. desantanai trophic niche breadth. Conclusions The diet of E. desantanai is mainly composed of Chironomidae, Cladocera, and Ostracoda; however, individuals consumed other food items owing to changes in hydrological periods, followed by characteristics of the Amonguijá and Paraguay Rivers and ontogenetic variation. In this respect, the results of this study are germane to the food ecology of E. desantanai, providing guidelines for the management and conservation of the species.

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Section: Discussionmentioning

confidence: 99%

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Gouveia¹,

Rondon

Súarez

2022

Acta Limnol. Bras.

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“…[ 83 ]. Zooplankton prey have been found in the gut content of small juveniles of several fish species which take advantage of their availability due to abundance and ease of predation [ 77 ], since small juvenile fishes have low ability to forage and are vulnerable to predation risk [ 84 ].…”

Section: Discussionmentioning

confidence: 99%

Does environmental heterogeneity explain β diversity of estuarine fish assemblages? Example from a tropical estuary under the influence of a semiarid climate, Brazil

et al. 2022

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Estuarine fish assemblages are often sensitive to environmental conditions, because fluctuation in physico-chemical conditions at different spatial and seasonal scales can directly influence species distributions. In this way, we conducted a field survey to investigate the role of estuarine gradient (environmental heterogeneity) in fish α and β diversity. The study was carried out in three zones in Mamanguape River estuary according to salinity and geomorphology features during an atypical climatic event in 2015. In total, 18,084 specimens of 125 species were captured. Additive partitioning of diversity analysis detected a higher proportion of beta diversity among estuarine zones during the rainy (β3 = 58.6%) and dry season (β3 = 40.94%) and were higher than expected by chance (Propexp> obs <0.001). Decomposing β-diversity analysis showed that total β-diversity (βsor) results were more dominated by species turnover (βsim) than nestedness (βnes) in both seasons. Forward selection procedure and db-RDA identified salinity, coarse sand and chlorophyll-a as the main environmental variables influencing βsor and site distance from estuary mouth and split as the main landscape variables. Variation partitioning analysis revealed more contribution to the pure fraction of environmental variables to fish species turnover, however, both pure fraction of environmental and landscape variables significantly contributed to βsim. Our study highlighted the importance to environmental heterogeneity and connectivity to promote fish diversity across the Mamanguape River estuary. Thus, future conservation policies should focus on maintaining these two components to guarantee its nursery ground role to estuarine fish assemblages.

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“…Similarly, the ontogenetic variation in its diet may be related to changes in the type of prey according to estuarine habitat used and the mouth size; the largest fish fed mainly on other fish, anomuran crustaceans and shrimps near the mangrove fringe, whereas smaller fish fed mainly on harpacticoid copepods near mangrove roots (Sandoval et al ., 2014). This decreasing intraspecific competition between small and large individuals is observed in catfish (Dantas et al ., 2013) and other estuarine fish (Brito et al ., 2019).…”

Section: Discussionmentioning

confidence: 99%

Stable‐isotope analysis reveals sources of organic matter and ontogenic feeding shifts of a mangrove‐dependent predator species, New Granada sea catfish, Ariopsis canteri

Londoño

Leal-Flórez

Blanco-Libreros

et al. 2020

Journal of Fish Biology

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To gain a better understanding on the trophic ecology of New Granada sea catfish, Ariopsis canteri, and their linkage to mangroves, nitrogen and stable carbon isotopes (δ 15 N and δ 13 C), as well as Bayesian mixing models, were used to explore trophic dynamics and potential ontogenic feeding shifts across different size classes: class I (8-20 cm), class II (21-32 cm) and class III (>32 cm). The study area was the estuary of the Atrato River Delta, where information about fish ecology is scarce. The δ 13 C of size class I was lower (mean ± S.D. = −24.96 ± 0.69‰) than that of size classes II (−22.20 ± 0.90‰) and III (−22.00 ± 1.96‰). The δ 15 N of size class I was lower (mean ± S.D. = 8.50 ± 0.67‰) than that of size classes II (9.77 ± 0.60‰) and III (10.00 ± 0.66‰). Body size was positively and significantly correlated to δ 15 N and δ 13 C. Individuals with L T > 32 cm presented the highest estimated trophic position (3.8). Five-source mixing models indicated that for class I, the mean estimated contribution of macroalgae was the highest (6%-57% C.I.), and for classes II and III, the mean estimated contribution of macrophytes was the highest (3%-53% C.I. and 4%-53% C.I., respectively). Ontogenetic feeding shifts of A. canteri were confirmed evidencing decreasing intraspecific competition between small and large individuals. Results suggest that mangroves are a nursery and feeding ground habitat for this species and that mangroves support A. canteri mainly due to the substrate/habitat that supports sources in the food webs. These results can be used in ecosystem-based fishery management focused on the protection of extensive mangrove areas in the southern Caribbean Sea.

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Intraspecific food resource partitioning in Brazilian silverside Atherinella brasiliensis (Atheriniformes: Atherinopsidae) in a tropical estuary, Brazil

Cited by 7 publications

References 51 publications

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Does environmental heterogeneity explain β diversity of estuarine fish assemblages? Example from a tropical estuary under the influence of a semiarid climate, Brazil

Stable‐isotope analysis reveals sources of organic matter and ontogenic feeding shifts of a mangrove‐dependent predator species, New Granada sea catfish, Ariopsis canteri

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