Banca de DEFESA: JESSICA FERNANDA GOMES PIO
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.STUDENT : JESSICA FERNANDA GOMES PIO
DATE: 12/09/2022
TIME: 13:00
LOCAL: Instituto de Biologia
TITLE:
Influence of leaf debris on Chironomidae larvae colonization in a stream in the Brazilian Cerrado
KEY WORDS:
Functional trophic group dissimilarity, leaf decomposition, Brazilian Cerrado, benthic macroinvertebrates, functional feeding group, leaf-detritus, richness, temporal variation.
PAGES: 67
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Zoologia Aplicada
SPECIALTY: Conservação das Espécies Animais
SUMMARY:
The assemblage of Chironomidae associated with vegetation is fundamental for the dynamics of energy flow. In addition to the influence of leaf debris, environmental variation at different spatial scales is also an essential factor in structuring Chironomidae assemblages. The goals of this study were: i) to evaluate the effects of the temporal variability of the entrance of allochthonous vegetation and the interactions of leaf debris on the succession of Chironomidae assemblages in an annual cycle of a stream in the Cerrado and; ii) to evaluate the structure and taxonomic and trophic composition of an assemblage of Chironomidae larvae associated with leaf detritus in a tropical stream in different seasonal periods. The leaves were collected in two different protocols in the Boiadeiro stream (Cerrado) in the dry, rainy, and transition periods (rainy-dry and dry-rainy). In the 1st protocol, the leaves were collected for 30 days and were subsequently incubated in the stream to evaluate the process of colonization by Chironomidae and loss of vegetation mass after 90 days. In the 2nd protocol, the leaves were collected for 30 days. Afterward, they were incubated in this stream to evaluate the colonization process by Chironomidae and microbial activity after 30 days. In the 1st study, 485 individuals were identified. The dry and dry-rainy transition periods showed lower richness and abundance for functional trophic groups (FTG). The composition of FTG of Chironomidae showed that the temporal variation between the periods was mediated by the time of exposure of leaf debris in the stream, being more segregated in the dry and rainy periods. In the 2nd study, 3,892 individuals were identified. Chironomidae richness was positively associated with the amount of aquatic fungal conidia in leaf debris. The larvae with the collector-gatherer habit were the most abundant and diversified. In the dry season, the highest values of abundance and total richness were recorded, while in the rainy season, there was the highest taxonomic variability of Chironomidae. In conclusion, the colonization of leaf debris by Chironomidae larvae was regulated by the period of permanence of allochthonous plant material in the stream. The higher environmental variations in the rainy season associated with an increase in the biomass of decomposing organisms increased taxonomic variability and reduced the abundance and total richness of Chironomidae larvae.
BANKING MEMBERS:
Interno - 1913950 - CARLOS EDUARDO COPATTI
Externo ao Programa - 1522389 - FRANCISCO CARLOS ROCHA DE BARROS JUNIOR
Externa à Instituição - ROZANE MARIA RESTELLO - URI
Externo à Instituição - GILBERTO GONÇALVES RODRIGUES - UFPE
Externo à Instituição - RICCARDO MUGNAI - UFMA