Diversidade de presas e predadores (Insecta) em mesohabitats de córregos de Cerrado

Abstract

Tropical streams feature high variety of habitats and environmental gradients, which reflect on the greater richness of aquatic insects. In this way, we evaluate if the diversity of aquatic insects of prey and predator categories is influenced by the type of substrates or by longitudinal portions in Cerrado streams. Our hypothesis is that prey and predator diversity will be determined by the type of substrate, assuming that the substrate serves as a source for foraging and / or refuge. In addition, the folhiço substrate will present greater abundance and richness due to the availability of shelter and food provided by this type of substrate. There will be differences in prey and predator composition among substrates, since some species have associations with the substrate type. The portions of the stream will have no effect on the diversity of prey and predator, since in streams of up to third order does not present considerable changes in physical characteristics. The study was carried out in nascent (1st order), intermediate (2nd) and estuary (3rd), in two streams, during dry and rainy periods. Five subsamples of sand, gravel, rocks or boulders were collected, backwaters, rapids and roots (substrate). The substrate influenced all prey and predator responses (abundance, richness and composition), but the environment (longitudinal portions) did not influence the abundance and predator composition. The influence of substrates on the diversity of prey and predators evidences the importance of riparian vegetation as a source of allochthonous material in bedside streams.

Description of a New Species and New Records of Naucoridae (Hemiptera: Heteroptera: Nepomorpha) from Eastern Brazil

“…Distribution. ARGENTINA [ 5 ]; BOLIVIA [ 46 ]; BRAZIL: AL [58; present study], AM [ 58 ], ES [present study], GO [ 58 ], MG [ 5 , 26 , 28 , 31 , 58 , 59 , 60 ], MT [ 58 , 61 , 62 ], RJ [ 5 , 34 , 54 , 58 ], RS [ 5 , 58 , 63 ], SC [ 5 , 58 ], TO [ 58 ]; COLOMBIA [ 19 ]; FRENCH GUIANA [ 64 ]; PARAGUAY [ 58 ]; PERU [ 58 ]; VENEZUELA [ 58 ].…”

Aquatic and Semiaquatic Heteroptera (Hemiptera: Insecta) Distribution in Streams on the Cerrado–Amazon Ecotone in Headwaters of Xingu River

“…For this reason, the increase of sediments at the channel and the reduction of allochthone material might affect the basis of food chains [4,58]. Thus, the reduction in the availability of niches favored competition for resources and the entry of generalist species into the group, changing local biodiversity [5,24,59].…”

Belostomatidae Leach, 1815 (Insecta: Hemiptera: Heteroptera: Nepomorpha) of northeastern Brazil

“…BRAZIL: Espírito Santo (Ribeiro 2007), Goiás (Menke & Lauck 1962), Maranhão (this work); Mato Grosso (Lauck 1964;Dias-Silva et al 2010;Giehl et al 2018), Minas Gerais (De Carlo 1938;Nieser & Melo 1997;Pelli & Barbosa 1998;Melo & Nieser 2004), Pará (Ribeiro 2000(Ribeiro , 2007Almeida et al 2019), Rio de Janeiro (De Carlo 1938;Ribeiro 2005Ribeiro , 2007, Roraima (Ribeiro 2000(Ribeiro , 2007, São Paulo (De Carlo 1938;Lauck 1964;Ribeiro 2007), Tocantins (Menke & Lauck 1962;Lauck 1964); COLOMBIA (Roback & Nieser 1974); SURINAME (De Carlo 1960).…”