Use of food resources and resource partitioning among five syntopic species of Hypostomus (Teleostei: Loricariidae) in an Atlantic Forest river in southern Brazil

Abilhôa, Vinícius; Valduga, Marcos Ostrowski; Frehse, Fabrício de Andrade; Vitule, Jean R. S.

doi:10.1590/s1984-4689zool-20160062

Cited by 13 publications

(10 citation statements)

References 16 publications

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“…Although PERMANOVA revealed significant differences in the diet between studied species, these observations reflect our results, as H. punctatus and P. maculicauda in the Mato Grosso stream displayed almost complete trophic niche overlap. Furthermore, the high consumption of sediment and organic matter seems to explain the higher feeding overlap between species (Abilhoa et al 2016) while the differences in the consumption of algae and plant debris are driving the differences detected in PERMANOVA. These variations in trophic resource utilization can be also explained by the differences in how species are exploring their foraging habitats (Pagotto et al 2011).…”

Section: Morphology and Feeding Ecology Between Studied Speciesmentioning

confidence: 97%

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Feeding strategy and morphology as indicators of habitat use and coexistence of two loricariid fishes from a Brazilian coastal stream

et al. 2020

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We aimed to evaluate the relationship between form and function of two Loricariidae species (Hypostomus punctatus and Parotocinclus maculicauda) from a Neotropical coastal stream. We performed morphological-dietary analysis and discussed their coexistence strategies, as well. We hypothesized that both species use similar food resources according to their morphology but differences in habitat use facilitate their coexistence. In order to test this hypothesis, morphology, diet and habitat use were analyzed for both species. Trophic variance and the Pianka Niche Overlap index were calculated to explore the differences in trophic niche. Correlations between species abundance and water flow were applied to test habitat use. Principal Component Analysis and one Permutational Multivariate Analysis of Variance were applied to test differences between morphology and diet of both species. Morphological-dietary relationships were tested with Mantel test correlations. Total abundance of H. punctatus was higher in the stream channel with higher water flow. The dominant food items were sediment and organic matter for both species, and high trophic niche overlap was revealed. Additionally, morphology did not explain feeding habits for both species. Morphological characteristics were significantly different, especially for intestine length, relative area of the dorsal fin, ventral flattening and mouth attributes. The study site was rich in sand sediment, mud, and clay that are not considered good substrates to the establishment and growing of periphyton, which is an important trophic resource to Loricariidae species. Here, low consumption of periphyton can provide a possible explanation for the feeding similarity and the weak morphological-dietary relationships for both species. Thus, the environmental conditions can be more important for diet composition when compared to the similar and specialized morphology of loricariids.

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Section: Morphology and Feeding Ecology Between Studied Speciesmentioning

confidence: 97%

“…Coexistence of close related species is normally mediated by spatial, feeding and/or morphological segregation (Wikramanayake 1990, Jackson et al 2001, Abilhoa et al 2016. In this context, studies on feeding habit and resource partitioning contribute to the understanding of species interactions in aquatic systems (e.g.…”

Section: Introductionmentioning

confidence: 99%

Feeding strategy and morphology as indicators of habitat use and coexistence of two loricariid fishes from a Brazilian coastal stream

et al. 2020

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“…; Abilhoa et al . ) and terrestrial insects that primarily belong to the families Vespidae and Formicidae (Dyer et al . ; Ferrareze et al .…”

Section: Insects As Natural Fish Preymentioning

confidence: 99%

Insect meals in fish nutrition

Nogales‐Mérida¹,

Gobbi²,

Józefiak

et al. 2018

Reviews in Aquaculture

215

178

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Different studies have shown that insect meals can partially or completely replace the fish and soya bean meals that are commonly used in aquaculture. However, information is lacking on the amino acid and fatty acid contents and digestibility of different insect meals. Moreover, we evaluated different proportions of insect diets and determined how these affected the nutritional values of insect meals. Our purpose was to clarify these aspects and consider the availability of protein, amino acids, lipids and fatty acids in insect meals in fish nutrition. Generally, insect meals have higher indispensable amino acid contents than other meal types, with contents closely related to those in fish meal. Insect meal can be an important source of essential amino acids such as methionine, with contents ranging between 0.47 and 4.03 g 100 g À1 sample. These values are higher than those reported for other animal and plant meals. In addition, insects are also good sources of lipids and fatty acids, and the amounts and types of fatty acids vary according to the species, stage of development and type of feed. Moreover, the additional nutritional value of insect meal includes compounds such as chitin, which is primarily considered a fibre but also contains nitrogen and amino acids. Insect peptides with activity against pathogenic microflora provide secondary biological effects, which may significantly improve animal health.

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“…In our study, these species were mainly represented by the genus Hypostomus and Steindachnerina, respectively. Besides the greater availability of organic detritus downstream, a greater solar incidence and the increase in temperature also promotes increased primary productivity, especially through the growth of periphytic algae attached to the rocky bottom (Pagotto et al, 2011;Wolff et al, 2013;Abilhoa et al, 2016). The solar radiation acts directly on the photosynthesis rate and determines the depth of the euphotic zone, whereas the temperature can act on phytoplankton productivity directly on the physiology of organisms and indirectly on the distribution of nutrients in the euphotic zone (Esteves, 2011).…”

Section: Discussionmentioning

confidence: 99%

Do environmental variables predict the trophic structure of fish fauna in a subtropical river (Uruguay River Ecoregion)?

Neves

Baumgartner

et al. 2018

J Limnol

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Trophic interactions represent the routes through which energy flows upwards within ecosystems and the understanding of such structuring under varying environmental conditions is still challenging. Here we test the hypothesis that differences in environmental variables act as environmental filters on the composition and trophic structure of local the fish fauna of a subtropical mountain river. We predict that differences in the trophic structure of the fish fauna occur along the river continuum. Main environmental parameters have been measured and fishes were sampled quarterly between August 2013 and May 2014 at six sampling sites in the main channel of the Pelotas River, Upper Uruguay ecoregion. We collected 3848 individuals belonging to 38 species, 4 orders and 11 families. The most (82.1%) consisted of small- and medium-sized individuals. The species were classified into eight trophic guilds: aquatic insectivorous, carnivorous, detritivorous, detritivorous/aquatic insectivorous, herbivorous, iliophagous, omnivorous and piscivorous. In general, herbivorous and piscivorous guilds were the most representative in both number and biomass. Significant differences detected by Permanova were for richness, numerical abundance and biomass between all the sites sampled. Relationships between the environmental variables and the composition of trophic guilds were observed along the longitudinal gradient by RLQ and fourth-corner analyses. The abundance of guilds omnivorous, aquatic insectivorous and herbivorous increases with higher values of chlorophyll-a and vegetation cover, especially characterizing the upstream sites (S1, S2 and S3). On the other hand, the abundance of the iliophagous, detritivorous/insectivorous and piscivorous guilds increases with greater values of width, temperature, inorganic phosphorus and total solids, a fact observed in downstream sites (S4, S5 and S6). Thus, it was possible to identify a clear variation in the trophic structure of the fish fauna along the Pelotas River (upstream-downstream), in which the local variables were efficient in predicting environmental filters that influence the trophic organization. In this scenario, our study follows the longitudinal model and evidences a greater accumulation of energy in food webs in the upstream-downstream direction, which favors the greatest abundance of piscivorous, detritivorous and iliophagous verified in stretches of greater volume and dimensions of river. These results highlight the importance of the local variables and the interrelationships in the lateral connectivity processes along the river continuum.

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Use of food resources and resource partitioning among five syntopic species of Hypostomus (Teleostei: Loricariidae) in an Atlantic Forest river in southern Brazil

Cited by 13 publications

References 16 publications

Feeding strategy and morphology as indicators of habitat use and coexistence of two loricariid fishes from a Brazilian coastal stream

Feeding strategy and morphology as indicators of habitat use and coexistence of two loricariid fishes from a Brazilian coastal stream

Insect meals in fish nutrition

Do environmental variables predict the trophic structure of fish fauna in a subtropical river (Uruguay River Ecoregion)?

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