Estudo morfológico da larva de último ínstar de Miathyria simplex (Rambur) (Odonata, Libellulidae)

Costa, Janira Martins; Assis, C. V. de

doi:10.1590/s0101-81751992000200020

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…However, according to Westfall (1953), analyzing samples of this species in Florida, he witnessed exuviae of up to 17 mm, differing from the total length of specimens found in Cuba and Puerto Rico. Regarding to M. simplex, the last instar varies from 12 to 14 mm (Costa & Assis, 1992). Lacerda et al (2011), studying different size scales of Pantala flavescens in the consumption of pacu (Piaractus mesopotamicus) and tilapia (Oreochromis niloticus), observed a decrease in fish consumption by the larger Odonata, P. flavescens species.…”

Section: Discussionmentioning

confidence: 99%

Predation rate of dragonfly (Odonata: Libellulidae) on tilapia (Oreochromis niloticus Linnaeus 1758) and the availability of alternative preys (Insecta: Diptera: Chironomidae) to increase fish survival

Fortunato,

Mendes,

Hayashi

et al. 2023

Acta Sci. Biol. Sci.

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The objective of this work was to evaluate the predation rates of two genera of Odonata Miathyria Kirby, 1889 and Erythemis Hagen, 1861 in post-larviculture of tilapia with and without availability of Chironomidae. For that, 3 experiments were carried out, the first to analyze which size scale of these two genera would be more efficient in the predation of tilapia and the other 2 experiments with the selected size scales, to analyze the predation rates on tilapia with different Odonata densities, with and without availability of the aquatic insect Chironomidae. For statistical analysis of the data, an analysis of variance (ANOVA) was applied with the Duncan test searching for the means in all experiments. In experiments 2 and 3 a linear regression model was also applied. In experiment 1, there were significant differences between treatments, and in the phase with Miathyria the predation of tilapia post-larvae was higher among odonates that corresponded to the size scale from 7.1 to 9.9 mm and therefore the scale was also selected for the next experiments. For Erythemis, the consumption of tilapia was higher in the size scale between 12.1 to 14,2 mm. In the following experiments, there were significant differences between treatments. With the increase in Odonata densities the predation of the fish was greater. With the availability of Chironomidae, the consumption of tilapia post-larvae decreased. The consumption of Chironomidae was higher than the consumption of fish in experiment 3. Miathyria proved to be more efficient than Erythemis in predation and the use of Chironomidae can be a sustainable alternative for post-larvae predation control on fish farms.

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Section: Discussionmentioning

confidence: 99%

Predation rate of dragonfly (Odonata: Libellulidae) on tilapia (Oreochromis niloticus Linnaeus 1758) and the availability of alternative preys (Insecta: Diptera: Chironomidae) to increase fish survival

Fortunato,

Mendes,

Hayashi

et al. 2023

Acta Sci. Biol. Sci.

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Distribuição do esforço de coleta de Odonata no Brasil – subsídios para escolha de áreas prioritárias para levantamentos faunísticos

Marco

Vianna

2005

Lundiana

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There is an urgent need to prioritize conservation areas, so that the invested resources protect as much biodiversity as possible, especially in developing countries. A way to select such areas is to estimate the biodiversity distribution but this strategy is constrained by the lack of knowledge and/or by the inaccessibility of the available information on species distribution. Based on a database on Odonata distribution in Brazil, it is shown that the sampling-effort and the largest numbers of recorded odonate species and genera are concentrated in areas with large number of researchers. The 6203 records employed here are distributed in only 29% of the national territory. The species richness is concentrated mainly in the states of Rio de Janeiro, Minas Gerais and São Paulo, in the Amazon River varzea and in some isolated points, such as Cuiabá (Mato Grosso state). We suggest that the sampling and inventory efforts are increased for Odonata, especially in the Brazilian northeast and areas in the Brazilian and Guyana Shields, for which there is practically no information available. Keywords - Species-richness distribution; Odonata; biogeographic database; sampling effort.

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Estudo morfológico da larva de último ínstar de Miathyria simplex (Rambur) (Odonata, Libellulidae)

Cited by 2 publications

References 2 publications

Predation rate of dragonfly (Odonata: Libellulidae) on tilapia (Oreochromis niloticus Linnaeus 1758) and the availability of alternative preys (Insecta: Diptera: Chironomidae) to increase fish survival

Predation rate of dragonfly (Odonata: Libellulidae) on tilapia (Oreochromis niloticus Linnaeus 1758) and the availability of alternative preys (Insecta: Diptera: Chironomidae) to increase fish survival

Distribuição do esforço de coleta de Odonata no Brasil – subsídios para escolha de áreas prioritárias para levantamentos faunísticos

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