Cannibalism as the main feeding behaviour of tucunares introduced in Southeast Brazil

Gomiero, Leandro Muller; Braga, Francisco Manoel de Souza

doi:10.1590/s1519-69842004000400009

Cited by 23 publications

(27 citation statements)

References 15 publications

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“…Cannibalism registered may characterize high population density or lack of food sources and shelter for the juveniles (Gomiero & Braga 2004b). In Trinidad, the guppies (Poecilia reticulata) exhibited different reproductive characteristics related to different types of predators (Reznick & Endler 1982).…”

Section: Discussionmentioning

confidence: 99%

Feeding habits of the ichthyofauna in a protected area in the State of São Paulo, southeastern Brazil

Gomiero

Braga

2008

Biota Neotrop.

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Gomiero, L. M.; Braga, F. M. S. Feeding habits of the ichthyofauna in a protected area in the state of São Paulo, southeastern Brazil. Biota Neotrop., vol 8, no. 1, Jan./Mar. 2008. Available from: . Abstract:The trophic relationships of a fish community were studied in two basins subjected to a strong human pressure in the interior of the State of São Paulo, southeastern Brazil. A total of 211 stomachs of 14 species were analyzed. Diets varied greatly, with the occurrence of piscivory, benthophagy, insectivory, herbivory, and illiophagy. Food items were described for each species and a great amount of insects was registered. Allochthonous and autochthonous food items showed different importance degrees according to the species analyzed. Stomach fullness was high in spring and summer in both basins; these areas were used as reproduction and foraging sites for the studied species. Resumo: Foram analisadas duas bacias em uma área com forte ação antrópica no interior do Estado de São Paulo, enfocando as relações tróficas das comunidades de peixes. Foram analisados 211 estômagos de 14 espécies. As dietas foram variadas sendo constatadas piscívoria, bentofagia, insetívoria, herbívoria e iliófagia. Os itens alimentares foram descritos para cada espécie analisada e verificou-se grande quantidade de insetos. Os itens alimentares alóctones e autóctones foram importantes em maior ou menor grau para as espécies da área. O índice de repleção estomacal elevou-se na primavera e no verão em ambas bacias, sendo que as áreas abordadas foram usadas para a reprodução e para a alimentação coletiva das espécies analisadas. Palavras-chave: alimentação, relação trófica, ictiofauna, APA de São Pedro e Analândia.

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Section: Discussionmentioning

confidence: 99%

Feeding habits of the ichthyofauna in a protected area in the State of São Paulo, southeastern Brazil

Gomiero

Braga

2008

Biota Neotrop.

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“…The intensity of infection associated with increased body size shown by Moravec et al (2002) differs from our results. In the present case, C. piquiti weighing 301-800 g showed the highest MI of infection, probably related to the fact that fish of lower weight might eat invertebrates (Gomiero & Braga, 2004a) that are intermediate hosts of proteocephalideans (Scholz, 1999). In contrast to the present study, Moravec et al (2002) did not observe seasonal variation.…”

Section: Discussionmentioning

confidence: 53%

Infection levels of proteocephalidean cestodes inCichla piquiti(Osteichthyes: Cichlidae) of the Volta Grande Reservoir, Minas Gerais, Brazil, relative to host body weight and gender

et al. 2011

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We evaluated the relationship between infection by proteocephalid cestodes and the sex and weight classes of tucunaré (Cichla piquiti) captured between August 1999 and June 2001 in the Volta Grande Reservoir, Minas Gerais, Brazil. A total of 96 fish, 75.9^9.3% males and 88.9^6.4% females, were parasitized by Proteocephalus macrophallus and P. microscopicus, with total mean intensities of 76.6^23.9 and 145.2^36.7, respectively, during this period. In the majority of the months analysed, males showed 71.4 -100% prevalence of parasitism and females 80 -100%. Although there was no significant difference, females showed a higher mean intensity of infection (145.2^36.7) than males (76.6^23.9). Fish weighing 300 -800 g showed a higher mean abundance of parasites (P , 0.05) compared with the biggest specimens weighing 801 -2750 g. Analysing both males and females together, the greatest mean intensities of infection were found in October and December (P , 0.05) independent of the year, which coincides with the months of highest rainfall. These results show that fish living in reservoirs may be more susceptible to intermediate hosts than those that live in rivers.

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“…Another important aspect in the adaptability to new environmental conditions that should be considered is Cichla's opportunistic feeding behavior (Resende et al, 2008) and cannibalism (Gomiero & Braga, 2004). For example, it was observed that cannibalism is more accentuated during Cichla's spawning periods and due to scarcity of alternative food items, such as small individuals of small native fish species (Gomiero & Braga, 2004;Villares Junior & Gomiero, 2010).…”

Section: Since Neutral Genetic Diversity Appear Unimportant In Cichlamentioning

confidence: 99%

“…For example, it was observed that cannibalism is more accentuated during Cichla's spawning periods and due to scarcity of alternative food items, such as small individuals of small native fish species (Gomiero & Braga, 2004;Villares Junior & Gomiero, 2010). On the other hand, low rates of cannibalism occur in natural environments and in invaded sites mainly due to high availability of prey (Resende et al, 2008;Winemiller et al, 1997;Zaret, 1977).…”

Section: Since Neutral Genetic Diversity Appear Unimportant In Cichlamentioning

confidence: 99%

“…Moreover, the biological characteristics of Cichla species have made their populations capable of expanding rapidly in the invasive range, especially in modified ecosystems such as hydroelectric reservoirs, pristine floodplains and lagoons (Espinola et al, 2010;Zaret & Paine, 1973). These include reproductive activity during almost the entire year (Vieira et al, 2009), bi-parental care of eggs and capability to rear young in oxygen-depleted lakes (Zaret, 1980), opportunistic feeding behavior -it preys on whatever it can swallow (Resende et al, 2008), cannibalism (Gomiero & Braga, 2004), and phenotypic plasticity that allowed adaptation to harsh ecological conditions (Chellappa et al, 2003). While Cichla species were apparently introduced into northeastern Brazil in the late 1940s by government agencies for establishing fish breeding farms, no information was available regarding their origin.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of propagule pressure and genetic diversity in the invasibility of a freshwater apex predator: the peacock bass (genus Cichla)

et al. 2014

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An important step in invasive biology is to assess biological variables that could be used to predict invasion success. The study of genetics, evolution, and interactions of invasive and native species in invaded ranges provides a unique opportunity to study processes in population genetics and the capability of a species' range expansion. Here, we used information from microsatellite DNA markers to test if genetic variation relates to propagule pressure in the successful invasion of an apex predator (the Amazonian cichlid Cichla) into Southeastern Brazilian River systems. Invasive populations of Cichla have negatively impacted many freshwater communities in Southeastern Brazil since the 1960s. Reduction of genetic variation was observed in all invasive populations for both Cichla kelberi (CK) and Cichla piquiti (CP). For instance, heterozygosity was lower in the invasive range when compared to native populations from the Amazon basin (CP H E = 0.179/0.44; CK H E = 0.258/0.536 respectively). Therefore, despite the successful invasion of Cichla in southeast Brazil, low genetic diversity was observed in the introduced populations. We suggest that a combination of factors, such as Cichla's reproductive and feeding strategies, the "evolutionary trap" effect and the biotic resistance hypothesis, overcome their depauperete genetic diversity, being key aspects in this apex predator invasion.Uma importante etapa na biologia da invasão é acessar variáveis biológicas que podem predizer o sucesso de invasão. O estudo da genética, evolução e interações entre invasores e espécies nativas no ambiente invadido pode prover uma oportunidade única para o estudo dos processos em genética de populações e a capacidade de uma espécie ampliar seu habitat. Nesse trabalho, nos utilizamos dados de marcadores de DNA microssatélites para testar se a variação genética é relacionada a pressão de propágulo na invasão bem sucedida do predador de topo (o ciclídeo Amazônico Cichla) nos rios do Sudeste Brasileiro. Populações invasoras de Cichla vem impactando negativamente diversas comunidades de água doce no Sudeste brasileiro deste 1960. A redução da variação genética foi observada em todas populações invasoras, tanto para Cichla kelberi (CK) como Cichla piquiti (CP). Por exemplo, a heterozigose foi menor no ambiente invadido quando comparada com as populações nativas da bacia Amazônica (CP HE = 0.179/0.44; CK HE = 0.258/0.536 respectivamente). Assim, apesar do sucesso da invasão de Cichla no sudoeste do Brasil, baixa diversidade genética foi observada nas populações introduzidas. Nós sugerimos que uma combinação de fatores, como as estratégias reprodutivas de Cichla, o efeito de "armadilha evolutiva" e a hipótese de resistências biótica superam o efeito que a diversidade genética depauperada exerce, sendo aspectos-chave na invasão desse predador de topo de cadeia.

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Cannibalism as the main feeding behaviour of tucunares introduced in Southeast Brazil

Cited by 23 publications

References 15 publications

Feeding habits of the ichthyofauna in a protected area in the State of São Paulo, southeastern Brazil

Feeding habits of the ichthyofauna in a protected area in the State of São Paulo, southeastern Brazil

Infection levels of proteocephalidean cestodes inCichla piquiti(Osteichthyes: Cichlidae) of the Volta Grande Reservoir, Minas Gerais, Brazil, relative to host body weight and gender

Analysis of propagule pressure and genetic diversity in the invasibility of a freshwater apex predator: the peacock bass (genus Cichla)

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