Banca de DEFESA: RAYANE DUARTE GOMES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : RAYANE DUARTE GOMES
DATE: 22/08/2022
TIME: 09:00
LOCAL: online, plataforma Google Meet
TITLE:

BIODIVERSITY OF ENDOPARASITIC COMMUNITIES OF FOUR SPECIES OF CARNIVOROUS FISH FROM MARGINAL LAGOONS OF THE UPPER AND MIDDLE SÃO FRANCISCO RIVER BASIN, BRAZIL

 

KEY WORDS:

Acanthocephala, Parasitic ecology, Helminths of freshwater carnivorous fish, Ichthyoparasitology, Nematoda, Parasitology of lagoon environments, Platyhelminthes, Pentastomida

PAGES: 197
BIG AREA: Ciências Biológicas
AREA: Parasitologia
SUBÁREA: Helmintologia de Parasitos
SPECIALTY: Helmintologia Animal
SUMMARY:

The São Francisco river basin is one of the main historical sources of fish for the riverside population and Brazilian markets. Among the fish species found in the basin, were selected four carnivorous hosts fish representatives of: Acestrorhynchidae - Acestrorhynchus lacustris, “peixe-cachorro”, native to the São Francisco and upper Paraná river basins; of Erythrinidae - Hoplias malabaricus, trahira, well distributed in Central and South America (from Costa Rica to Argentina); and Serrasalmidae - Pygocentrus piraya and Serrasalmus brandtii, “piranha” and “pirambeba”, respectively, endemic to the São Francisco basin. The fish were collected in different marginal lagoons of the upper and middle São Francisco river basin. In total, 27 taxa were found, which are allocated among the phyla Platyhelminthes: Digenea fam. gen. sp.; Clinostomum sp., Sphincterodiplostomum musculosum and Proteocephalidae gen. sp. 1 and 2 (encysted plerocercoids larvae and juvenile/adult, respectively); Nematoda: Nematoda fam. gen. sp.; Freitascapillaria sp.; Paracapillaria piscicola; Capillariidae gen. sp. 1 and 2; Cucullanus (Cucullanus) sp.; Brevimulticaecum sp.; Contracaecum sp. Types 1 and 2; Hysterothylacium sp.; Goezia sp.; Procamallanus (Spirocamallanus) freitasi, Procamallanus (S.) hilarii; Procamallanus (S.) inopinatus; Procamallanus (S.) saofranciscencis; Guyanema baudi; Travassosnema travassosi paranaensis; Gnathostoma sp.; Spiroxys sp.; Cystidicoloides fischeri and Spinitectus rodolphiheringi; Acanthocephala: Quadrigyrus sp.; and Pentastomida: Sebekia sp.. The dietary differences between the carnivorous hosts studied reflected in the structure of the endoparasitic communities, showing the occurrence of exclusive and shared species, indicating greater or lesser similarity of ingested food items. The species Proteocephalidae gen. sp. 1 (plerocercoid larvae), Contracaecum sp. Types 1 and 2, Hysterothylacium sp., Spiroxys sp. (general larval helminths), Procamallanus (S.) inopinatus (generalist adult helminths) and C. fischeri were common among the endoparasitic communities of the four fish species. Clinostomum sp., Brevimulticaecum sp., Gnathostoma sp., Freitascapillaria sp., P. piscicola, Procamallanus (S.) hilarii, Travassosnema t. paranaensis, S. rodolphiheringi and Quadrigyrus sp. were exclusive to the endoparasitic community of A. lacustris; H. malabaricus did not present exclusive species; Sebekia sp. was exclusive to P. piraya; and Procamallanus (S.) freitasi, Goezia sp. and Digenea fam. gen. sp. exclusive to S. brandtii. The presence, with significant ecological indexes (reaching a prevalence of 100%), of larval endoparasites in the four communities revealed the role played by these top predatory fish, also, as intermediate and/or paratenic hosts of the parasitic life cycles, beyond the expected acting as definitive hosts of adult helminth species. It was also possible to record species of endoparasites for the first time in the hosts and in the basin, such as C. fischeri for the first time mentioned in H. malabaricus, a well-studied and widely distributed fish species; Proteocephalidae gen. sp. 1, Brevimulticaecum sp., Gnathostoma sp., Freitascapillaria sp., P. piscicola, Capillariidae gen. sp. 1, Procamallanus (S.) hilarii, C. fischeri and S. rodolphiheringi which are new records in A. lacustris; Proteocephalidae gen. sp. 2, Capillariidae gen. sp. 2, Procamallanus (S.) saofranciscencis, Cucullanus (Cucullanus) sp., Guyanema baudi, Nematoda fam. gen. sp. and Sebekia sp. are new records for P. piraya; Digenea fam. gen. sp., S. musculosum, Proteocephalidae gen. sp. 1 and 2, Capillariidae gen. sp. 2, Procamallanus (S.) freitasi and Cucullanus (Cucullanus) sp. first reported in S. brandtii. The geographic distribution of all species was extended to the marginal lagoon environments of the upper and middle São Francisco basin; and the species S. musculosum, the representatives of Capillariidae, Procamallanus (S.) hilarii, Procamallanus (S.) freitasi, Gnathostoma sp., G. baudi, Travassosnema t. paranaensis and Sebekia sp. have their geographic distribution extended to the São Francisco river basin. The marginal lagoons proved to be a potential environment for parasitic transmissions; in them, the varied biotic interactions reflected positively on the parasitism of carnivorous fish. This was evidenced by the increase in the number of parasite species recorded in the present work, which become part of the parasitic biodiversity of fish in the São Francisco River basin.

BANKING MEMBERS:
Presidente - 386993 - MARILIA DE CARVALHO BRASIL SATO
Interno - 1971595 - BRUNO PEREIRA BERTO
Externa ao Programa - 3008869 - MICHELLE DANIELE DOS SANTOS CLAPP - UFRRJExterna ao Programa - 1764496 - VIVIANE MOREIRA DE LIMA - UFRRJExterna à Instituição - DEBORA HENRIQUE DA SILVA ANJOS - UFRJ
Externa à Instituição - MARCIA CAVALCANTI DE ALBUQUERQUE - SME