Banca de QUALIFICAÇÃO: ALEXSANDRO ANTONIO PORTILHO DAMASCENO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ALEXSANDRO ANTONIO PORTILHO DAMASCENO
DATE: 28/02/2025
TIME: 18:00
LOCAL: Plataforma google meeting
TITLE:

CAPTURA, COLETA DE AMOSTRAS BIOLÓGICAS E ULTRASSONOGRAFIA NO MONITORAMENTO DA SANIDADE DE BOTOS-DO-ARAGUAIA (Inia araguaensis)

KEY WORDS:

Catch-release; cetaceans; Amazon.

PAGES: 42
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

The Araguaia dolphin (Inia araguaiaensis) is the only cetacean species endemic to Brazil and is considered vulnerable and at risk of extinction. Its main threats are habitat degradation and loss and the construction of hydroelectric plants. In addition, they are important indicators of environmental health, therefore having relevance in One Health. In this sense, there is a need for capture and release of cetaceans to collect biological samples in order to monitor the health of populations. This study sought to describe a capture and release protocol for I. araguaiaensis, enabling the collection of biological material. The capture was carried out in the municipality of Mocajuba, in the lower Tocantins, Eastern Amazon. We had all the necessary licenses and permits approved for the procedures. From September to October 2023, an expedition was carried out to assess the population of I. araguaiensis. The capture was carried out with a purse seine net made of cotton threads, measuring XxX. A team of 15 to 17 people formed a human corral around the target dolphin, holding the net above the water. Each animal was individually lured into the corral. When the desired dolphin entered the corral, the net was released. With the dolphin trapped in the larger corral, a smaller group left the corral to capture the dolphin, using a stretcher made of cotton strips measuring XxX. The animal was carefully restrained to avoid accidents and transported to the beach, where there was a platform with a moistened mattress. The dolphin was monitored by measuring its respiratory and heart rates every 5 minutes. In addition, body length and chest circumference were measured with a tape measure. Sexing was done by the presence of mammary slits around the genital slit. The reproductive condition of adult females was verified by ultrasound. Swabs from the mouth, anal, genitals, spiracles, mammary slits and skin lesions were collected. Tissue, blood and nasal secretion samples, and sound recordings by the animals were also collected. Twelve individuals were observed attending the capture site, including one adult male, six adult females, three juveniles and two calves. The protocol resulted in the capture of 42% (5/12 individuals). Among those captured, three were males (one adult and two juveniles) and two were females (one adult and one juvenile). The dolphins were restrained for 21.60 ± 5.37 minutes for the collection of biological material. The biometric data measured were thoracic circumference 99.8 ± 16.77 and total length 169.25 ± 30.92. Juvenile dolphins also exhibited a lower average heart and respiratory rate (Coti, Cuíras and Tiff); 7.33 ± 3.04 mrp and 78.90 ± 40.96) compared to adults (Manga and Dente dupla; 8.63 ± 5.04 mrp and 79.60 ± 43.67 mrp). By following this protocol, researchers can conduct capture and release operations while minimizing stress and maximizing welfare and safety of Araguaia dolphins.

COMMITTEE MEMBERS:
Presidente - 1305300 - FREDERICO OZANAN BARROS MONTEIRO
Externo ao Programa - 1247731 - THYAGO HABNER DE SOUZA PEREIRA - UFRAExterno à Instituição - PEDRO NACIB JORGE-NETO