Banca de DEFESA: DANIELA CRISTINA SOUZA MONTEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DANIELA CRISTINA SOUZA MONTEIRO
DATE: 18/05/2023
TIME: 09:00
LOCAL: on-line
TITLE:

Feeding, trophic level, southwestern atlantic, Bluefish, Skipjack tuna, stingrays

KEY WORDS:

Feeding, trophic level, southwestern atlantic, Bluefish, Skipjack tuna, stingrays

PAGES: 65
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Zoologia Aplicada
SUMMARY:

The composition of the stomach contents of 989 individuals of the species Katsuwonus pelamis (93), Pomatomus saltatrix (521), Atlantoraja cyclophora (129) and Rioraja agassizii (246) captured off the coast of Rio de Janeiro was analyzed. Of the pelagic species, Katsuwonus pelamis, showed to have a specialist feeding strategy, consuming predominantly sardines (Sardinella brasiliensis), while Pomatomus saltatrix has its diet composed mainly of eagle owls (Dactylopterus volitans) and a specialist-opportunistic strategy. Among the demersal stingray species, Atlantoraja cyclophora and Rioraja agassizii, similar feeding strategies were observed, with preference for the consumption of crustaceans, mainly Pleoticus muelleri and Peneidae, respectively. No significant differences were found between the diets of pelagic species, both piscivorous, occupying high trophic levels, typical of top predators of the food chain (4.4 and 4.8). The food niche overlap between them is intermediate (Ba = 0.54). The results suggest that there is some partition of food resources available in the environment. The diet of P. saltatrix is more diversified. The consumption of coió in summer and autumn deserves to be highlighted. Among the demersal species, no marked differences were observed either. Both species of stingrays consume mainly crustaceans and fish, occupying trophic levels between 3.8 and 3.9 and have low food niche overlap (Ba = 0.30). The generated results confirm that all species occupy high trophic levels and consume mainly fish and crustaceans. Seasonal variations in the diets of these species may be related to their availability. The low values of food niche overlap between species, linked to the diversity of food items available in the home range of the species, also suggest a condition of little interspecific competition.

COMMITTEE MEMBERS:
Externo à Instituição - ACACIO RIBEIRO GOMES TOMAS - Inst. Pesca
Externo à Instituição - CASSIANO MONTEIRO-NETO - UFF
Interno - 2143107 - LEONARDO MITRANO NEVES
Interno - 1341945 - RAFAEL DE ALMEIDA TUBINO