Banca de DEFESA: FERNANDO DE CARVALHO ARAÚJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : FERNANDO DE CARVALHO ARAÚJO
DATA : 08/09/2022
HORA: 07:30
LOCAL: Sala de Videoconferência
TÍTULO:

IS THE RELATIVE ABUNDANCE OF Plagioscion squamosissiums A FISH SPECIES INTRODUCED INTO THE BRAZILIAN SEMI-ARID RESERVOIR INFLUENCED BY CLIMATE AND LAND COVER?

PALAVRAS-CHAVES:

Satellite Images, Freshwater, Non-Native Piscivore, Sciaenidae.

PÁGINAS: 35
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The abundance of introduced species in different types of ecosystems is associated with several factors such as: environmental conditions, absence of natural predators, food plasticity, availability of resources and habitats. For this reason, the aims of this work was investigate how the climate and the use and land cover around of the Santa Cruz Reservoir, located in municipality of Apodí / RN, influence the abundance of Plagioscion squamosissimus a Amazonian native fish introduced in reservoirs of semi-arid Brazilian region. For this, were used: a) Data of average temperature and accumulated precipitation of the municipality of Apodi / RN obtained from the historical database of the National Institute of Meteorology (INMET), collected at the meteorological station of the Rio Grande do Norte Agricultural Research Company (EMPARN); b) Volumetric data of the Santa Cruz Reservoir obtained through the portal of the Rio Grande do Norte Secretary of Environment and Water Resources (SEMARH – RN); c) Data from the Santa Cruz Reservoir water layer and the land use and land cover categories, obtained through the processing of images from different satellites, to which the normalized difference water index (NDWI) and Soil Adjusted Vegetation Index (SAVI) and Finally, the ichthyofauna, was sampled in the Santa Cruz reservoir, at eight points distributed along the water body, during the months of February, May, August and November, in the years of 2013, 2015 and 2017 in a partnership between the Federal Rural University of the Semiarid (UFERSA) and the Rio Grande do Norte state University (UERN), where, the individuals collected were identified, quantified and the relative abundance of P. squamosissimus was calculated by the ratio of the number of individuals of the species studied by the total number of individuals collected, this result being multiplied by 100, where the percentage of that species in relation to the others during the days of capture is obtained. The results show a reduction over time in the volume and in the area of the water depth of the reservoir, highlighting in the composition of its surroundings, two main categories of land use and cover, the undergrowth and the exposed soil that are inversely proportional to each other, the correlation of these two categories with the abundance of P.squamosissimus was positive with the area of exposed soil and negative with the undergrowth, the latter being the only category that presented statistical significance among the categories of use and land cover (R² adj: 0.273, P = 0.04), that is, the reduction of undergrowth around the reservoir is associated with an increase in the relative abundance of corvina, this indicates that, in more severe climatic conditions such as a situation of scarcity water, where the vegetation usually loses its leaves, for example, there is an increase in organic matter coming from the banks, bringing changes in the conditions and resources that that allow the survival of this species.

MEMBROS DA BANCA:
Presidente - 5313 - DANIELLE PERETTI
Interno - 12241 - FILIPE DA SILVA PEIXOTO
Externo à Instituição - JÔNNATA FERNANDES DE OLIVEIRA - IFCE