Banca de DEFESA: CAREN BEATRIZ DOS SANTOS FELIX DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CAREN BEATRIZ DOS SANTOS FELIX DA SILVA
DATE: 02/05/2024
TIME: 09:00
LOCAL: AUDITÓRIO
TITLE:

MORPHOMETRIC ANALYSIS OF OTOLITHS Caranx latus IN NORTHEASTERN BRAZIL

KEY WORDS:

Otoliths, Morphometry, Morphology, Elliptic Fourier Analysis.

PAGES: 44
BIG AREA: Ciências Exatas e da Terra
AREA: Probabilidade e Estatística
SUMMARY:

Otoliths are calcified structures that are fundamental for hydrostatic
balance and hearing in teleost fish. These structures provide a wealth of information that
allows us to investigate the dynamics and life history of fish. In recent years, the analysis
of otolith shape has been highlighted as a valuable tool for discriminating between species
and associated estuaries. In this study, we used Fourier descriptors and multivariate
analysis to compare the shape patterns of 389 juvenile individuals caught in five estuaries
in northeastern Brazil: Sirinhaém, Santa Cruz de Itapissuma, Suape, Rio Formoso and
Goiana. The otoliths differed significantly between the estuaries. MANOVA revealed
significant differences between them (p < 0.05), especially between Suape. Sirinhaém
and Santa Cruz de Itapissuma, although cross-validation showed a low accuracy of 38%.
These differences in otolith shape are directly related to environmental factors, including
freshwater and saltwater influences, as well as the impacts of anthropogenic activities.
Thus, otolith shape analysis has emerged as an effective tool not only for differentiating
estuaries with strictly similar phenotypic characteristics, but also for identifying stocks,
which contributes to more efficient management of inland fisheries resources. However,
further studies are needed to better understand the contribution of the genetic effect in
comparison with environmental and biotic effects, in order to clarify the differences
observed in otoliths and their relationship with the estuarine environment.

COMMITTEE MEMBERS:
Interno - GUILHERME ROCHA MOREIRA
Externo à Instituição - JONAS ELOI DE VASCONCELOS FILHO - UFPE
Presidente - PAULO JOSE DUARTE NETO