Banca de DEFESA: Marcus Vinicius Celani Rocha

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Marcus Vinicius Celani Rocha
DATE: 28/02/2023
TIME: 08:30
LOCAL: Auditório 3
TITLE:

Use of preserved and agricultural habitat by Scarabaeoidea species (Insecta: Coleoptera) in the Cerrado

KEY WORDS:

Displacement, marking-and-recapture, cerrado sensu stricto, soybean, dung beetles, white grubs.

PAGES: 51
BIG AREA: Ciências Biológicas
AREA: Ecologia
SUMMARY:

Dung beetles (Scarabaeidae: Scarabaeinae) use various food sources, with mammal feces being the most common resource. Due to their feeding habits and the way they manipulate and nest in the resource, they provide a number of ecosystem services, such as the cycling of organic matter, secondary seed dispersal, parasite control, and help aerate the soil, among others. There are about 7,000 described species and 726 occur in Brazil, and in the Cerrado, they are distributed among the various physiognomic forms that occur in the biome, from the more open ones formed by grasses and herbaceous plants, to the denser ones, which are forest formations, and this group has a period of activity synchronized to the seasonality of the biome, because in the rainy season they are more active and abundant. Little is known about the population aspects and the movement ability of individuals in Scarabaeoidea, thus the present work aimed to verify the movement ability of four species of this superfamily, and the thesis was divided into two chapters. The first chapter investigated, using the mark-and-recapture technique, the movement ability of Oxysternon palemo, Coprophanaeus sptizi, and Diabroctis mirabilis in cerrado sensu stricto, and evaluated population parameters of the three species over the course of a year. All individuals were captured exclusively in the rainy season, and the abundance, recruitment and survival rates were higher between November and January for the three species. Oxysternon palemo had the highest abundance, followed by C. spizi and D. mirabilis, and the maximum displacements also followed this order. Oxysternon palemo was dominant in cerrado sensu stricto and its high abundance and ability to move possibly mitigate the effect of fragmentation, but the same was not observed for D. mirabilis, which had the lowest abundance and only one movement recorded, a short distance. The second chapter investigated the ability of Phyllophaga capillata to move in a soybean field during the swarm period and the flight activity of this species in the laboratory. Most adults were recaptured at the shortest distance established in the study, 50 m, and only six male individuals were recaptured at the greatest distance possible, 250 m. The flight activity experiment in the laboratory showed that most individuals (about 70% of males and 53% of females) showed the behavior of leaving the ground and flying daily. With displacements of 250 m in one night, it is possible that these insects colonize new properties or plots of large soybean plantations at the beginning of the rainy season and disperse throughout the plantations during the swarm of this species.

BANKING MEMBERS:
Externo à Instituição - ALEXANDRE SPECHT - EMBRAPA
Externo ao Programa - 387446 - JOSE ROBERTO PUJOL LUZ
Presidente - 2476936 - MARINA REGINA FRIZZAS
Externo à Instituição - RAUL ALBERTO LAUMANN - EMBRAPA
Interna - 1194783 - ROSANA TIDON