Estimativa do tamanho de duas espécies de ciclídeos (Osteichthyes, Perciformes) predados por Lontra longicaudis (Olfers) (Carnivora, Mustelidae), através de análise das escamas

Kasper, Carlos Benhur; Salvi, Juliana; Grillo, Hamilton César Zanardi

doi:10.1590/s0101-81752004000300012

Cited by 13 publications

(9 citation statements)

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“…There are very few references about the size of prey taken by the Neotropical otter (QUADROS & MONTEIRO-FILHO, 2001;KASPER et al, 2004b). However, it is probable that the species does not dedicate much time attempting to capture large-sized prey.…”

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confidence: 99%

Trophic ecology and the use of shelters and latrines by the Neotropical otter (Lontra longicaudis) in the Taquari Valley, Southern Brazil

Kasper

Bastazini

Salvi

et al. 2008

Iheringia, Sér. Zool.

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ABSTRACT. This manuscript presents information about the ecology of Lontra longicaudis (Olfers, 1818) in the Taquari Valley, State of Rio Grande do Sul, southern Brazil. The study was carried out in two areas located in the Forquetinha Creek and in the Forqueta River from January to December 2003. The otters are specialist feeders (B sta = 0.24), with a diet based mostly on fish, especially those of the families Loricariidae and Cichlidae. Most shelters used by the species were excavated burrows underneath tree roots, while shelters within rocks were used less frequently. The burrows showed great variation in size, being found on average 3.5 m (sd = 3.6 m) away from the margin and 2.5 m (sd = 1.2 m) above the water level. Scent marks were made preferentially on rocks and fallen tree trunks at the edge of the water. There was a tendency to increase the reutilization of latrines in detriment of using new sites throughout the sample period. KEYWORDS.Neotropical otter, feeding habit, scent marking, resting sites, Brazil. RESUMO. Ecologia trófica e o uso de abrigos e latrinas pela lontra Neotropical (Lontra longicaudis) no Vale do Taquari, RioGrande do Sul, Brasil. O presente estudo apresenta dados sobre a ecologia de Lontra longicaudis (Olfers, 1818) no Vale do Taquari, sul do Brasil. O trabalho foi realizado em duas áreas localizadas no arroio Forquetinha e rio Forqueta, entre janeiro e dezembro de 2003. A população apresentou hábito alimentar especialista (B sta = 0,24), baseado em peixes das famílias Loricariidae e Cichlidae. Os abrigos utilizados pela espécie foram formados em sua maioria, por escavações sob raízes de árvores e, com menor freqüência, entre rochas. Os abrigos escavados apresentaram dimensões bastante variáveis, sendo que estiveram em média a 3,5 m (s = 3,6 m) de distância da margem e 2,5 m (s = 1,2 m) de altura em relação ao nível da água. A utilização de marcas odoríferas se deu preferencialmente sobre rochas e troncos caídos na margem, sendo que houve uma tendência de aumento na reutilização de latrinas, em detrimento de novos pontos de deposição de fezes, no decorrer do período amostrado. PALAVRAS CHAVE. Lontra Neotropical, hábito alimentar, marcação odorífera, locais de descanso, Brasil.

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Trophic ecology and the use of shelters and latrines by the Neotropical otter (Lontra longicaudis) in the Taquari Valley, Southern Brazil

Kasper

Bastazini

Salvi

et al. 2008

Iheringia, Sér. Zool.

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“…A list of potential prey species for otters was made, consisting of all the fish species reported in the study area that have a reported maximum total length ≥ 100 mm (S1 Table). Size selection was based on the assumption that otters prefer to feed on fish within the 100-150 mm size range [53]. Prey remains that could be identified were fish scales, otoliths or vertebra; crustacean shells; and mammal hairs.…”

Section: Methodsmentioning

confidence: 99%

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

Juarez-Sanchez

Blake

Hellgren

2019

Preprint

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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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“…Thus, it is probable that environmental fluctuations, prey availability, prey microhabitat, conspicuousness, and palatability could be some factors that influences the prey selection and not only differences in dentition in the otters species or escape ability and size of prey (Pardini 1998, Kasper et al 2004b, Perini et al 2009 …”

Section: Seasonal Prey's Fluctuationsmentioning

confidence: 99%

Seasonal variation in the diet of Lontra longicaudis in the Paraná River basin, Argentina

et al. 2014

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We studied the Neotropical otter (Lontra longicaudis) seasonal diet variations in the middle Paraná River valley, in central-northern Argentina, at the southern limit of its global range. We recorded 745 prey items in 320 scats collected over the course of 1 year in a tributary stream of the Paraná River. Fish, crustaceans, mammals, and insects were the most important items in frequency of occurrence among items. Other items, like mollusks, birds, amphibians, and reptilians were presented in low frequency in all seasons. We recorded seasonal variation in the frequency of the principal categories items: fish, mammals, crustaceans, and insects and in reptilian that had low frequency. Although fish were the most common items consumed by the otter, other groups such as crustaceans, mammals, and insects, were also important in the diet of the Neotropical otter throughout the seasons. Mammals and insects showed a higher frequency in the Neotropical otter diet in our study than in Brazil, Mexico, and even northern Argentina. We noted a marked variation throughout the Neotropical region in the niche breadth indices among studies of Neotropical otter's diet. The Shannon H′ diversity index showed a higher value in our study than in most of previous diet analyses of this species.

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Estimativa do tamanho de duas espécies de ciclídeos (Osteichthyes, Perciformes) predados por Lontra longicaudis (Olfers) (Carnivora, Mustelidae), através de análise das escamas

Cited by 13 publications

References 2 publications

Trophic ecology and the use of shelters and latrines by the Neotropical otter (Lontra longicaudis) in the Taquari Valley, Southern Brazil

Trophic ecology and the use of shelters and latrines by the Neotropical otter (Lontra longicaudis) in the Taquari Valley, Southern Brazil

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

Seasonal variation in the diet of Lontra longicaudis in the Paraná River basin, Argentina

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