Three invasive species occurring in the diets of fishes in a Neotropical floodplain

The establishment of a given phenotype is only one expression from a range of hidden developmental possibilities. Developmental plasticity at hidden reaction norms might elicit phenotypic diversification under new developmental environments. Current discussion benefits from empirical analyses that integrate multiple environmental stimuli to evaluate how plastic responses may shape phenotypic variation. We raised Megaleporinus macrocephalus fish in different environmental settings to address contributions of developmental plasticity for emergence of new phenotypes and subsequent morphospace diversification. Plastic morphotypes were evaluated at two complementary scales, the M. macrocephalus morphospace and the higher taxonomic level of Anostomidae family. Morphospace analyses demonstrated that developmental plasticity quickly releases distinct head morphotypes that were hidden in the parental monomorphic population. Plastic morphotypes occupied discrete and previously unfilled morphospace regions, a result obtained from comparisons with a control population and in analyses including several Anostomidae species. Plastic responses involved adjustments in shape and relative position of head bonesets, and fish raised under specific environmental combinations rescued phenotypic patterns described for different genera. Therefore, developmental plasticity possibly contributes to adaptive radiation in Anostomidae. Results illustrate how plastic responses enable morphospace diversification and contribute to evolution.

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“…2011, 2014; Isaac et al. 2014), foraging at benthic regions of rivers and lakes (Teresa et al. 2011, 2014).…”

Section: Methodsmentioning

confidence: 99%

Developmental plasticity reveals hidden fish phenotypes and enables morphospace diversification

et al. 2021

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“…Diet information for fish species was gathered from previous studies in the Upper Paraná River floodplain (online Supplementary material S1). Most of these studies involved primary data collection (long term ecological research (LTER/CNPq/UEM-SITE 06) (Isaac et al 2014). We constructed a binary network of diet data made up of 52 fish species with available data and 58 food types (online Supplementary material S2).…”

Section: Datamentioning

confidence: 99%

Influence of host diet and phylogeny on parasite sharing by fish in a diverse tropical floodplain

et al. 2015

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The patterns of parasite sharing among hosts have important implications for ecosystem structure and functioning, and are influenced by several ecological and evolutionary factors associated with both hosts and parasites. Here we evaluated the influence of fish diet and phylogenetic relatedness on the pattern of infection by parasites with contrasting life history strategies in a freshwater ecosystem of key ecological importance in South America. The studied network of interactions included 52 fish species, which consumed 58 food types and were infected with 303 parasite taxa. Our results show that both diet and evolutionary history of hosts significantly explained parasite sharing; phylogenetically close fish species and/or species sharing food types tend to share more parasites. However, the effect of diet was observed only for endoparasites in contrast to ectoparasites. These results are consistent with the different life history strategies and selective pressures imposed on these groups: endoparasites are in general acquired via ingestion by their intermediate hosts, whereas ectoparasites actively seek and attach to the gills, body surface or nostrils of its sole host, thus not depending directly on its feeding habits.

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“…É notável o maior número de estudos sobre a dinâmica populacional e estrutura ictiofaunística, quando comparado aos estudos do padrão de alimentação das espécies de peixes e metodologias para estudos da dieta em áreas de várzeas do Brasil. Apesar disso, podemos constatar significativo número de trabalhos tendo como enfoques principais a descrição dos hábitos, composição e a utilização de recursos alimentares (Bozza & Hahn, 2010, Isaac et al 2014, Tonella et al 2018, estrutura trófica (Suçuarana et al 2016, Dias et al 2017, amplitude e sobreposição de nicho (Novakowski et al 2008, Corrêa et al 2011, Dias et al 2017 e o efeito da sazonalidade sobre a dieta (Luz et al 2009, Röpke et al 2014, Cunha et al 2018.…”

Section: Introductionunclassified

Hábitos Alimentares Em Peixes De Água Doce: Uma Revisão Sobre Metodologias E Estudos Em Várzeas Brasileiras

Corrêa

Smith

2019

Oecol. Aust.

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Resumo: Em ambientes sazonalmente alagáveis, os hábitos alimentares demonstrados pela comunidade íctica são reflexos da disponibilidade de recursos no meio e da adaptabilidade das espécies às condições ambientais. Nesse sentido, este trabalho apresenta uma revisão sobre os principais métodos adotados para análise da dieta das assembleias de peixes em várzeas de rios brasileiros, além de uma revisão dos hábitos alimentares, plasticidade trófica e o efeito da sazonalidade na dieta. A avaliação da dieta das espécies de peixes nesses ambientes pode ser realizada a partir de diferentes metodologias de análise do conteúdo estomacal e índices obtidos a partir desses resultados. Para avaliar os procedimentos mais utilizados na análise dos dados de alimentação natural de peixes por pesquisadores da área, foi feita uma revisão bibliográfica de artigos publicados entre 1990 a 2018. Verificou-se que um dos métodos mais frequentes foi o volumétrico e a maioria das publicações não empregaram índices. Além disso, as informações obtidas a partir de estudos sobre dieta dos peixes que habitam as várzeas evidenciaram uma ampla plasticidade alimentar, a qual pode decorrer de variações espaciais e temporais, que alteram a estrutura e a dinâmica das assembleias de peixes, levando a uma grande versatilidade na exploração dos recursos alimentares. Palavras-chave: alimentação natural; guildas tróficas; lagoa marginal; método volumétrico; sazonalidade. FOOD HABITS IN FRESHWATER FISH: A REVIEW ON STUDIES IN BRAZILIAN FLOODPLAIN. In seasonally flooded environments, the dietary habits demonstrated by the fish community reflect the availability of resources in the environment and the adaptability of species to environmental conditions. In this sense, this work presents a review on the main methods adopted to analyze the diet of fish assemblages in floodplains of Brazilian rivers, as well as a review of dietary habits, trophic plasticity and the effect of seasonality on the diet. The evaluation of the diet of the fish species in these environments can be carried out from different methodologies of analysis of the stomach contents and indices obtained from these results. In order to evaluate the most used procedures in the analysis of natural fish feeding data by researchers in the area, a bibliographic review and a survey of articles published between 1990 and 2018 were carried out. One of the most frequent methods was the volumetric and most publications did not employ indexes. In addition, the information obtained from studies on the diet of the fish that inhabit the floodplains showed wide food plasticity, which may be due to spatial and temporal variations that alter the structure and dynamics of fish assemblages, leading to a large versatility in the exploitation of food resources.

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Three invasive species occurring in the diets of fishes in a Neotropical floodplain

Cited by 12 publications

References 15 publications

Developmental plasticity reveals hidden fish phenotypes and enables morphospace diversification

Developmental plasticity reveals hidden fish phenotypes and enables morphospace diversification

Influence of host diet and phylogeny on parasite sharing by fish in a diverse tropical floodplain

Hábitos Alimentares Em Peixes De Água Doce: Uma Revisão Sobre Metodologias E Estudos Em Várzeas Brasileiras

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