Carbon from littoral producers is the major source of energy for bottom-feeding fish in a tropical floodplain

Lopes, Célia A.; Manetta, Gislaine Iachstel; Figueiredo, Bruno R. S.; Martinelli, Luiz Antônio; Benedito, Evanilde

doi:10.1007/s10641-014-0343-7

Cited by 13 publications

(9 citation statements)

References 29 publications

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“…The phytoplankton was the main resource used by the species. Isotopic studies have shown the significant contribution of phytoplankton algae to aquatic organisms, including detritivorous fish (Araujo-Lima et al, 1986;Benedito-Cecilio et al, 2000;Benedito-Cecilio et al, 2004;Lopes et al, 2015) and zooplankton (Santana et al, 2009;. Among these are studies on the Orinoco River (Venezuela and Colombia), which showed that phytoplankton was among the main carbon sources for fish and invertebrates (Lewis et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Divergence in energy sources for Prochilodus lineatus (Characiformes: Prochilodontidae) in Neotropical floodplains

2018

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The stable carbon isotopic variability and the contributions of autochthonous (sediment microbial biomass, phytoplankton, and periphyton) and allochthonous (soil microbial biomass) sources available to the detritivorous fish Prochilodus lineatus were investigated in three environments of the floodplain of the Upper Paraná River. The isotopic composition of carbon sources and fish varied significantly among the studied environments. The autochthonous resources, represented by the phytoplankton, were the most assimilated by the species, followed by periphyton and sediment microbial biomass. The species used the sources differently in each environment. This study suggests that the inherent characteristics of this area, as well as the size of the watershed, the dry season, anthropogenic actions, and phytoplankton productivity, favor the use of autochthonous resources by the species studied. Therefore, studies in the floodplain should employ an eco-hydrological approach that quantifies the magnitude of energy subsidies, as well as an access route to consumers, knowledge about the selectivity of detritivorous species and the effects of different land uses.

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Section: Discussionmentioning

confidence: 99%

Divergence in energy sources for Prochilodus lineatus (Characiformes: Prochilodontidae) in Neotropical floodplains

2018

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“…Invasive species are predicted to have better chances of establishment in native assemblages that are depleted or disrupted and more likely to have long-term success in systems highly altered by human activity [83]. The increase in δ 13 C variation over time suggests that the NRO diet has included a prey that consumes different producer types or a prey that consumes producers in a different proportion, likely because of the ability of ACF to exploit a different range/proportion of plant resources than natives from the same trophic guild [84]. Furthermore, the decrease in FTL across rivers (Mopan River showing similar values to San Pedro River and higher than Pasion River) combined with lower mean values of δ 15 N provide evidence of a reduction in the NRO trophic level associated with ACF presence.…”

Section: Discussionmentioning

confidence: 99%

Variation in Neotropical river otter (Lontra longicaudis) diet: Effects of an invasive prey species

2019

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Predation is one of the main barriers that exotic species may face in newly colonized areas and may help stop or control the potential negative impacts of invasive species in the environment. We evaluated if the consumption of an invasive prey (armored catfish: Pterygoplichtys sp.) affects the dietary niche breadth and trophic level of a native predator (Neotropical river otter: Lontra longicaudis) in northern Guatemala. We examined otter scats from three rivers: two where the invasive armored catfish occurred and one without the invasive fish. Samples were collected two and seven years after the first report of the catfish in the area. We performed gross scat analysis and stable isotope analyses of nitrogen and carbon of fecal matter. Where the invasive armored catfish occurred, it was the main prey item for L. longicaudis. Particularly in the river outside of protected areas seven years after the first report of the catfish, where it accounted for 49% of the otter diet. Concordance was found between the two techniques to estimate dietary niche breadth and trophic level. The dietary niche breath of otters was narrower seven years after the invasion in comparison to two years after the invasion in both invaded rivers, but the extent of the reduction was lesser inside the protected area. Finally, the trophic level of otters also showed a reduction related to the occurrence of the armored catfish in their diet.

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“…Invasive species are predicted to have better chances of establishment in native assemblages that are depleted or disrupted and more likely to have long-term success in systems highly altered by human activity [81]. The increase in δ 13 C variation over time suggests that the NRO diet has included a prey that consumes different producer types or a prey that consumes producers in a different proportion, likely because of the ability of ACF to exploit a different range/proportion of plant resources than natives from the same trophic guild [82]. Furthermore, the decrease in FTL across rivers (Mopan River showing similar values to San Pedro River and higher than Pasion River) combined with lower mean values of δ 15 N provide evidence of a reduction in the NRO trophic level associated with ACF presence.…”

Section: Discussionmentioning

confidence: 99%

Variation in neotropical river otter (Lontra longicaudis) diet: Effects of an invasive prey species

Juarez-Sanchez

Blake

Hellgren

2019

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46Due to human activities, some species have expanded their distribution into areas 47 that were historically difficult or impossible to reach by natural dispersal. Such species 48 may become invasive if they successfully establish reproductive populations. Predation is 49 one of the main barriers that exotic species may face in newly colonized areas. We 50 evaluated the effect of an invasive prey (armored catfish: Pterygoplichtys sp.) on the 51 dietary niche breadth and trophic level of a native predator (Neotropical river otter: 52 Lontra longicaudis) in northern Guatemala. We examined otter scats from three rivers: 53 two where the invasive armored catfish occurred and one without the invasive fish. 54 Samples were collected two and seven years after the first report of the catfish in the 55 area. We performed gross scat analysis and stable isotope analyses of nitrogen and carbon 56 of fecal matter. Where the invasive armored catfish occurred, it was the main prey item 57 for L. longicaudis. Particularly in the river outside of protected areas seven years after the 58 first report of the catfish, where it accounted for 49% of the otter diet. Concordance was 59 found between the two techniques to estimate dietary niche breadth and trophic level. 60 The dietary niche breath of otters was narrower seven years after the invasion in 61 comparison to two years after the invasion in both invaded rivers, but, the extent of the 62 reduction was less inside the protected area. Finally, the trophic level of otters also 63 showed a reduction related to the occurrence of the armored catfish on their diet. Resumen 65Como producto de las actividades humanas algunas especies han expandido su 66 distribución hacia áreas que históricamente eran difícil o imposible de alcanzar mediante 67 de dispersión natural. Estas especies pueden convertirse en invasoras si establecen 68 exitosamente poblaciones reproductivas. La depredación es una de las principales 69 barreras que las especies exóticas deben afrontar en las áreas recientemente colonizadas. 70 Evaluamos los efectos de una especie invasora (el pez diablo: Pterygoplichtys sp.) sobre la 71 amplitud de nicho alimenticio y el nivel trófico de un depredador nativo (la nutria de rio 72 Neo-tropical: Lontra longicaudis) en el norte de Guatemala. Examinamos las excretas de 73 nutrias provenientes de tres ríos: dos donde el pez diablo se encuentra presente y uno 74 donde este invasor aún está ausente. Las muestras fueron colectadas dos y siete años 75 después del primer reporte de del pez diablo en le área. Realizamos un análisis 76 macroscópico de las excretas y análisis de isotopos estables de nitrógeno y carbono de la 77 materia fecal. Donde el pez diablo invasor estaba presente, fue el principal ítem 78 alimenticio de L. longicaudis. Particularmente en el río ubicado fuera de áreas protegidas 79 siete años después del primer reporte del pez diablo, donde este consistió en el 49% de la 80 dieta de la nutria. Encontramos concordancia entre las dos técnicas para estimar la 81 amplitu...

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Carbon from littoral producers is the major source of energy for bottom-feeding fish in a tropical floodplain

Cited by 13 publications

References 29 publications

Divergence in energy sources for Prochilodus lineatus (Characiformes: Prochilodontidae) in Neotropical floodplains

Divergence in energy sources for Prochilodus lineatus (Characiformes: Prochilodontidae) in Neotropical floodplains

Variation in Neotropical river otter (Lontra longicaudis) diet: Effects of an invasive prey species

Variation in neotropical river otter (Lontra longicaudis) diet: Effects of an invasive prey species

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