Anais do X Simpósio Internacional em Ciências Veterinárias (X SINCVET)

HELMINTH COMMUNITY OF THRICHOMYS LAURENTIUS (RODENTIA: ECHIMYIDAE) BETWEEN TWO CONTRASTING PHYTOGEOGRAPHIC SUBUNITS OF THE CAATINGA

Publicado em 22/05/2026 - ISBN: 978-65-272-2456-3

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Título do Trabalho
HELMINTH COMMUNITY OF THRICHOMYS LAURENTIUS (RODENTIA: ECHIMYIDAE) BETWEEN TWO CONTRASTING PHYTOGEOGRAPHIC SUBUNITS OF THE CAATINGA
Autores
  • Bruno de Oliveira Telles Ferreira
  • Natalia Alves Costa
  • Thiago dos Santos Cardoso
  • Camila Dos Santos lucio
  • Débora Sá Lemes
  • Ana Júlia Rapozo Dias
  • Michele Maria dos Santos
  • PAULO D´ANDREA
  • Arnaldo Maldonado
  • Raquel de Oliveira Simoes
Modalidade
Resumo Simples
Área temática
Helmintologia: sistemática, epidemiologia e controle
Data de Publicação
22/05/2026
País da Publicação
Brasil
Idioma da Publicação
pt-BR
Página do Trabalho
https://www.even3.com.br/anais/x-simposio-internacional-ciencias-veterinarias/1425999-helminth-community--of-thrichomys-laurentius-(rodentia--echimyidae)-between-two-contrasting-phytogeographic-subu
ISBN
978-65-272-2456-3
Palavras-Chave
Parasite Ecology, Heligmonellidae, Host-Parasite Interactions, Neotropical Rodents.
Resumo
The structuring of parasite communities in small mammals is shaped by complex biotic factors intrinsic to the host and extrinsic environmental factors. The caviomorph rodent Thrichomys laurentius Thomas, 1904, and its associated helminth fauna constitute an excellent model for assessing how contrasting habitats shape parasite assemblages. Here, we evaluated how two contrasting Caatinga phytophysiognomies—the xeric Carrasco (Croatá/CE) and the more humid Mata Seca (Meruoca/CE)—shape the composition and population parameters of the helminth community in Thrichomys laurentius, by comparing prevalence, mean abundance, and mean intensity across environments. A total of 27 rodents were examined, 15 at Carrasco and 12 at Mata Seca, and helminths were collected via necropsy and identified using specialized bibliography, and parasitological parameters were calculated using established quantitative protocols. All field procedures strictly followed the standards for capture, handling, and care approved by the Ethics Committee on Animal Use (CEUA) of the Oswaldo Cruz Foundation (CEUA Nº LW-39/14 and L-018/2022) and authorized by the Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio / SISBIO) (License N°13373-1). The total helminth fauna consisted of seven taxa: the nematodes Heligmostrongylus tcheprakovae (Durette-Desset & Tcheprakoff, 1969) Durette-Desset, 1971, H. interrogans Lent & Freitas, 1935, Stilestrongylus freitasi Durette-Desset, 1968, Stilestrongylus sp., Helminthoxys freitasi Quentin, 1969, and Paraspidodera uncinata (Rudolphi, 1819) Travassos, 1914, and the cestode Raillietina sp. Fuhrmann, 1920. Overall parasite prevalence in Mata Seca reached 100% (12/12), starkly contrasting with 53.33% (8/15) in Carrasco. The Mata Seca community was dominated by Heligmostrongylus species, where H. tcheprakovae reached the highest mean intensity (MI = 146.91 ± 168.54). Conversely, H. interrogans was absent in Carrasco, and the mean abundance of H. tcheprakovae was approximately 19 times lower. This difference in parasite load can be explained by the distinct life-cycle strategies: Heligmostrongylus species require a free-living larval stage in humid soil (vulnerable to desiccation), favoring the Mata Seca; while species found exclusively in Carrasco, like H. freitasi and P. uncinata, succeed in aridity because their infective L3 stage develops protected inside the egg, circumventing the need for stable environmental moisture. In conclusion, the physiognomic variation within the Caatinga imposes powerful environmental filters that shape helminth community structure by selecting for different life-cycle strategies. Moreover, this study documents the first host record of P. uncinata in T. laurentius, confirming the parasite fauna's high sensitivity to the heterogeneity of this biome.
Título do Evento
X Simpósio Internacional em Ciências Veterinárias | X International Symposium in Veterinary Sciences
Cidade do Evento
Seropédica
Título dos Anais do Evento
Anais do X Simpósio Internacional em Ciências Veterinárias (X SINCVET)
Nome da Editora
Even3
Meio de Divulgação
Meio Digital

Como citar

FERREIRA, Bruno de Oliveira Telles et al.. HELMINTH COMMUNITY OF THRICHOMYS LAURENTIUS (RODENTIA: ECHIMYIDAE) BETWEEN TWO CONTRASTING PHYTOGEOGRAPHIC SUBUNITS OF THE CAATINGA.. In: Anais do X Simpósio Internacional em Ciências Veterinárias (X SINCVET). Anais...Seropédica(RJ) UFRRJ, 2025. Disponível em: https//www.even3.com.br/anais/x-simposio-internacional-ciencias-veterinarias/1425999-HELMINTH-COMMUNITY--OF-THRICHOMYS-LAURENTIUS-(RODENTIA--ECHIMYIDAE)-BETWEEN-TWO-CONTRASTING-PHYTOGEOGRAPHIC-SUBU. Acesso em: 31/10/2026

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