Food of an endangered cyprinodont (Aphanius iberus): ontogenetic diet shift and prey electivity

Alcaraz, Carles; García‐Berthou, Emili

doi:10.1007/s10641-006-0018-0

Cited by 62 publications

(55 citation statements)

References 28 publications

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“…These results confirm that ontogenetic dietary shifts occur widely among omnivorous tropical stream fishes (Kramer & Bryant, 1995b). Trends in fish diet have also been detected in other tropical and temperate zones (Amundsen et al, 2003;Katunzi et al, 2006;Rezsu & Specziár, 2006;Alcaraz & García-Berthou, 2007). In this sense, shifts in the feeding ecology during growth strengthen the notion that species may not be an adequate unit when comparing food habits among species that occupy the same area during ontogeny (Stoner & Livingston, 1984;Livingston,1988).…”

Section: Discussionsupporting

confidence: 72%

[No Title Available]

2008

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Information related to the diet of one species always contributes to the knowledge of its bionomy and the functioning of the ecosystem in which the species lives. Therefore, understanding the feeding ecology of one fish population and its ontogenetic, spatial and temporal aspects help to understand the structure of fish assemblages and river communities. Knowledge of this structure is essential for habitat management and biodiversity conservation. The feeding ecology of Deuterodon langei Travassos, 1957 was studied through analyses of diet composition, sharing of resources, feeding strategy and contribution of food items to the width of its niche. The analysis included an assessment of ontogenetic, spatial and seasonal variations. The species was considered omnivorous with great plasticity caused by seasonal variation in food availability throughout the river basin, but mainly through ontogeny. The diet of smaller individuals revealed a predominance of insects and other arthropods, while the diet of larger specimens showed allochthonous plant items as the main components. The low intestinal quotient (IQ) values for the smaller individuals were accounted for their mainly insectivorous diet. The greater relative length of the intestine can account for the greater plasticity of the adult diet, enabling them to use diet items of larger size and more difficult digestion, such as plant items. Therefore, shifts in feeding ecology during growth are confirmed in this omnivorous tropical river fish, strengthening the concept that, when comparing food habits among species, fish size must be taken into account. This study also provides needed information regarding the feeding ecology of fishes intrinsically associated with the Atlantic rainforest, one of the most threatened and biodiverse ecosystems of the planet.Informações relacionadas à alimentação de uma espécie contribuem para o conhecimento de sua bionomia e funcionamento do ecossistema no qual ela vive. Desta forma, entender a ecologia alimentar de uma população de peixes e seus aspectos ontogenéticos, temporais e espaciais auxiliam na compreensão da assembléia de peixes e de toda a comunidade de um rio. Reconhecer tal estrutura é fundamental para o manejo e conservação da biodiversidade do habitat. A ecologia alimentar de Deuterodon langei Travassos, 1957 foi analisada por meio da composição da dieta, partilha de recursos, estratégia alimentar e contribuição dos itens alimentares para o nicho alimentar. As análises incluem uma abordagem das variações ontogenéticas, espaciais e temporais. A espécie foi considerada onívora com uma grande plasticidade alimentar causada pela variabilidade sazonal na disponibilidade de recursos e ao longo da bacia hidrográfica, mas principalmente ao longo de sua ontogenia. A dieta dos indivíduos menores revelou uma predominância de insetos e outros artrópodes, enquanto nos indivíduos maiores ocorreu um predomínio de vegetais alóctones. Os baixos valores de Quociente Intestinal (IQ) para os indivíduos menores foram associados a uma dieta ...

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Section: Discussionsupporting

confidence: 72%

[No Title Available]

2008

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“…Furthermore, we did not observe diet changes related with size classes, even though shift in food habits during ontogenetic development is well known in fishes (Nikolsky, 1963;Amundsen et al, 2003;Rezsu & Specziár, 2006;Alcaraz & García-Berthou, 2007), and was already registered for Rivulidae (Laufer et al, 2009) and also in a laboratory experiment performed with R. luelingi (Santos-Filho, 1997). In the present study, we believe that the pattern observed was due to the great abundance and availability of insect preys (the most consumed food items) in the environment studied, however, studies on the availability of feeding resources are necessary to corroborate this hypothesis.…”

Section: Discussioncontrasting

confidence: 46%

Feeding ecology of Rivulus luelingi (Aplocheiloidei: Rivulidae) in a Coastal Atlantic Rainforest stream, southern Brazil

2010

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Feeding habits of the killifish Rivulus luelingi collected in a black water stream of the Coastal Atlantic Rainforest in southern Brazil were investigated. Eight samplings were made between April 2003 and January 2004. The diet, assessed through a similarity matrix with the estimated contribution values of food items, included microcrustaceans, aquatic immature insects (larvae and pupae), aquatic adult insects, terrestrial insects, insect fragments, spiders, and plant fragments. Differences in the diet according to temporal variations (months) were registered, but changes related with size classes evaluated and high/low precipitation period were not observed. The species presented an insectivorous feeding habit, and its diet in the studied stream was composed of autochthonous (mainly aquatic immature insects) and allochthonous (mainly insect fragments) material.Neste estudo foram investigados os hábitos alimentares do peixe anual Rivulus luelingi em um riacho de água escura da Floresta Atlântica Costeira do Sul do Brasil. Oito amostragens foram realizadas entre abril de 2003 e janeiro de 2004. A dieta, avaliada através de uma matriz de similaridade com os valores de contribuição estimados para os itens alimentares, inclui microcrustáceos, insetos imaturos aquáticos, insetos aquáticos e terrestres, fragmentos de insetos, aranhas e fragmentos de plantas. Diferenças relacionadas ao período amostral (meses) foram registradas, mas mudanças na dieta em função das classes de tamanho avaliadas e o período de alta/baixa precipitação não foram observadas. A espécie apresentou hábito alimentar insetívoro, e sua dieta no riacho estudado foi composta por itens autóctones (principalmente insetos imaturos aquáticos) e alóctones (principalmente fragmentos de insetos).

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“…Adults (large individuals) feed mainly on Formicidae, plant fragments and aquatic ticks, whereas juveniles (small individuals) feed basically on aquatic immature insects (Chironomidae) and aquatic ticks. A shift in food habits with size increase is well known in fi shes (Nikolsky, 1963;Amundsen et al, 2003;Rezsu and Specziár, 2006;Alcaraz and García-Berthou, 2007), and has already been registered for Rivulidae (Laufer et al, 2009), as well as for R. luelingi in a laboratory experiment (Santos-Filho, 1997). Generally, larger fi sh eat larger food and a greater variety of organisms, whereas smaller fi sh feed on less diverse and smaller sized food items.…”

Section: Discussionmentioning

confidence: 80%

Effects of body size on the diet of Rivulus haraldsiolii (Aplocheiloidei: Rivulidae) in a coastal Atlantic Rainforest island stream, southern Brazil

Abilhôa

Vitule²,

Bornatowski³

et al. 2010

Biotemas

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ResumoEfeito do tamanho corporal na dieta de Rivulus haraldsiolii (Aplocheiloidei: Rivulidae) em um riacho litorâneo insular de Floresta Atlântica, sul do Brasil. Foi investigado o efeito do tamanho corporal no hábito alimentar de exemplares de Rivulus haraldsiolii coletados em um riacho litorâneo insular de Floresta Atlântica. Amostragens foram realizadas durante uma fase de campo realizada em 13 de julho de 2009, em um riacho de água salobra localizado na porção nordeste da Ilha do Mel, localizada em região meridional de distribuição da Floresta Atlântica no sul do Brasil. A dieta da espécie incluiu insetos imaturos aquáticos (pupas de Diptera e larvas de Chironomidae), insetos aquáticos (Hemiptera -Vellidae), microcrustáceos (Cladocera), ácaros aquáticos (Acarina), gastrópodes (Pomacea sp.), insetos terrestres (Coleoptera, Formicidae e Isoptera), fragmentos de insetos e de plantas. A espécie apresentou hábito onívoro, e diferenças na dieta foram relacionadas com as variações no tamanho corporal. Adultos (indivíduos maiores) alimentaram-se principalmente de Formicidae, fragmentos de plantas e ácaros aquáticos, enquanto que jovens (indivíduos menores) alimentaram-se basicamente de larvas aquáticas de insetos (Chironomidae) e ácaros aquáticos.Unitermos: ecologia alimentar, peixe-anual, peixes de água doce, região neotropical AbstractThe effect of body size on the feeding habits of the little-known killifi sh Rivulus haraldsiolii, collected in a coastal Atlantic Rainforest island stream, was investigated. Samples were collected during a study trip on Biotemas, 23 (4): 59-64, dezembro de 2010

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Food of an endangered cyprinodont (Aphanius iberus): ontogenetic diet shift and prey electivity

Cited by 62 publications

References 28 publications

[No Title Available]

[No Title Available]

Feeding ecology of Rivulus luelingi (Aplocheiloidei: Rivulidae) in a Coastal Atlantic Rainforest stream, southern Brazil

Effects of body size on the diet of Rivulus haraldsiolii (Aplocheiloidei: Rivulidae) in a coastal Atlantic Rainforest island stream, southern Brazil

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