Banca de QUALIFICAÇÃO: DOUGLAS DA COSTA SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : DOUGLAS DA COSTA SANTOS
DATA : 28/05/2020
HORA: 09:00
LOCAL: Nova Xavantina/Remotamente
TÍTULO:

Seasonal fluctuations and spatiotemporal variation of the Trichoptera community in intermittent stream

PALAVRAS-CHAVES:

Seasonality, Cerrado-Amazonian Transition, Intermittency, Environmental conditions, Climate change.

PÁGINAS: 25
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia de Ecossistemas
RESUMO:

Variations in environmental conditions over space and time can affect the structure of the Caddisfly community. In this way, studies that aim to verify seasonal fluctuations and spatio-temporal variation, are capable of indicating changes that occur in the environment due to the variations that this community presents, mainly in view of the current climate change scenario. The objective of our work was to evaluate the effect of temporal / seasonal and limnological variations on the immature community of Caddisfly along a longitudinal gradient. With the hypothesis that both the community structure and the limnological variables are affected by environmental variations. This study was carried out in the Bacaba stream, located in the municipality of Nova xavantina-MT, in a transition area between Cerrado and the Amazon Forest. The collections were carried out during the five-year period (2011 to 2016), with quarterly collections in the drought and rain. We collected it in three portions of the stream continuum (nascent, intermediate and mouth). For this purpose, a 100m linear transection was established, divided into 20 segments of 5m, where an 18cm diameter strainer was passed, collecting substrate samples from the margins. Caddisfly community was affected by both longitudinal (East, Intermediate and Foz), temporal (2011 to 2016) and seasonal variations (Drought and Rain). The abundance was different between all collection points as well as between periods of drought and rain. The wealth showed a difference between the source and the mouth, and it was also different between the seasons. The composition was also different between the years, with 2016 being the least rich and abundant. In general, the point with the lowest wealth and abundance was recorded at the point of the mouth, during all sampled years and seasons, indicating that the community was affected by the environmental degradation present at that point. The community structure was affected by seasonality, the drought period being the richest and most abundant, indicating that the composition of Caddisfly is affected by the homogenization of the environment due to the substrate transport caused by seasonal changes. Both wealth and abundance showed a positive relationship with Dissolved Oxygen and a negative relationship with Ammonia. Thus, our results indicate that the immature community of Caddisfly is affected by longitudinal, temporal and seasonal variations that may be accentuated due to environmental changes that affect aquatic environments, providing information for the elaboration of effective policies for the conservation of aquatic environments in the área Cerrado-Amazonian Transition.

MEMBROS DA BANCA:
Presidente - 114819007 - RICARDO KEICHI UMETSU
Interno - 996.005.011-49 - DIVINO VICENTE SILVÉRIO - UnB
Externo ao Programa - 295695001 - FABIANO CORRÊA
Externo à Instituição - NUBIA FRANÇA DA SILVA GIEHL - UFMG