Banca de DEFESA: KARINA RIGUETE DE ARAÚJO LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : KARINA RIGUETE DE ARAÚJO LIMA
DATE: 26/09/2023
TIME: 09:30
LOCAL: https://meet.google.com/eav-hrqf-bub
TITLE:

Impact of different feedings and development subtsracts on the biology of Stomoxys calcitrans

 

 

 

KEY WORDS:

feeding impact, survival, reproductive potential.

PAGES: 54
BIG AREA: Ciências Biológicas
AREA: Parasitologia
SUMMARY:

Stomoxys calcitrans (Diptera: Muscidae) is an obligatory hematophagous fly, an ectoparasite
of various mammal species, with bovines and equines being the most affected due to its
aggressive and persistent feeding habits. Population outbreaks, related to increased sugarcane
p roduction in livestock areas, and the increased resistance to insecticides, intensify concerns
about this species, as it is responsible for the mechanical transmission of various pathogens
among parasitized animals, as well as causing significant losses in cattle farming. Therefore,
studies that enable the development of insect control strategies are of great importance. The
generalist feeding habit of S. calcitrans provides an interesting point of investigation. For this
reason, this study analyzed the influence of different diets (sucrose solution and bovine, equine,
ovine, rabbit, and human blood) and developmental substrates (sugarcane based and alfalfa
hay based ) on the fly's biology. Analyses of feeding behavior showed a greater attraction of the
fly t o bovine and equine blood and sucrose solution, consistent with the fly's preferred hosts in
nature and its habit of consuming sugary foods in its natural habitat. Longevity experiments
demonstrated higher survival rates in flies fed with ovine blood, foll owed by bovine blood,
developed on sugarcane based substrate. Furthermore, feeding on ovine blood, in both
substrates, resulted in the highest values of reproductive potential for the species. Contrary to
our expectations, feeding on equine blood showed ne gative impacts on the fly's survival and
reproduction, despite horses being considered one of its preferred hosts. When observing
ovarian development, delays in organ development were observed as a result of feeding on
equine and rabbit blood, while feedin g on bovine and ovine blood showed superior patterns of
development, demonstrating relevant results for the analyzed oviposition rates. The different
diets and developmental substrates did not show significantly different results among the
analyzed groups. The observed changes are possibly based on the nutritional differences of each
condition, as well as direct impacts on digestion and the microbiota. A better knowledge of S.
calcitrans biology contributes to the development of novels control strategies at the same time
that we intend to optimize the parameters of colony flies production.

COMMITTEE MEMBERS:
Presidente - 1792175 - PATRICIA FAMPA NEGREIROS LIMA
Interna - 3103478 - MARISTELA PECKLE PEIXOTO
Interna - 2221855 - PATRICIA SILVA GOLO
Externo ao Programa - 1555317 - EMERSON GUEDES PONTES - UFRRJExterno à Instituição - FERNANDO GENTA