Banca de DEFESA: RAFAEL ANGELO REVOREDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RAFAEL ANGELO REVOREDO
DATE: 03/12/2021
TIME: 15:30
LOCAL: https://meet.google.com/suj-sepz-rcv
TITLE:

COLLISION OF MIGRATORY SEABIRD ON POWER LINE IN NORTHEASTERN BRAZIL: SPACE-TIME EVALUATION AND DESCRIPTION OF GONADAL HISTOLOGY FOR CONSERVATION PURPOSES

KEY WORDS:

Power line. Birds. Wind farm. Ovary. Testes.

PAGES: 66
BIG AREA: Ciências Biológicas
AREA: Morfologia
SUBÁREA: Histologia
SUMMARY:

Among the anthropogenic impacts suffered by birds, collisions of these animals on built structures, especially on power lines, are increasingly frequent and alarming. However, studies on this topic are still recent and scarce, especially in South America and Brazil. Migratory birds are animals that generally stand out in this type of impact, among which are the marine species Sterna dougallii (ROST) and Sterna hirundo (COTE) that migrate to the South American coast during the boreal winter and can be found on the coast from the Rio Grande do Norte (RN). As they are birds with a well-defined reproductive seasonality, their gonads undergo periodic changes, but little is known about these dynamics at the histological level, as well as about the general characteristics of gonadal histology. Representatives of COTE and ROST began to be found by the beach monitoring teams of the Project Cetaceans of Costa Branca (PCCB-UERN), near a power distribution line, with signs of collision, on a beach on the coast of RN between the years 2010 and 2020. Tissue samples from different organs of animals that died were stored in the biological sample bank of the the PCCB-UERN. In view of this series, this research sought to characterize the events of bird collisions on a power line in the city of Galinhos/RN, in view of environmental changes associated with the construction of a wind farm, as well as to describe the morphology of the gonads and the gonadal stage of individuals involved in the problem. Collision data were collected between 2010 and 2020 daily and uninterrupted by monitoring the beach stretch where the power distribution line is located. The birds found had their coordinates recorded and if they were alive, they were sent to the PCCB-UERN Marine Fauna Rehabilitation Center. For the analysis of reproductive biology, the gonads of 62 birds that died were used, fixed in 10% formalin and submitted to laboratory routine for the preparation of histological slides. This research indicated that there was a significant increase in the frequency of birds colliding with the power distribution line, coinciding with the installation of a wind farm on a neighboring beach and that this remained even after the installation of markers on part of the wires of the line. Histological analysis of the gonads revealed a pattern corresponding to that of other species, the ovaries showed a cortex region with follicles at different stages of maturation and also a very pronounced medullary region; the testes showed seminiferous tubules with narrowed lumens and seminiferous epithelium without sperm production, as well as well-developed interstitial tissue. Other researches show that wind farms can cause displacement on bird flight routes, which may indicate a possible influence of the facility on the increase in collisions; other researches claim that fixed spiral markers (the type installed in the line of this study) have a lesser mitigating effect when compared to those with moving parts. In short, this research points out bird collision events on power lines that have never before been registered in RN due to lack of monitoring and indicate the possible influence of a wind farm in this process.

BANKING MEMBERS:
Presidente - 1672446 - SIMONE ALMEIDA GAVILAN
Externa ao Programa - 3291543 - RENATA SWANY SOARES DO NASCIMENTO
Externo à Instituição - JOÃO PAULO TAVARES DAMASCENO