Publicado

2022-03-07

Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil

Dieta de Acanthochelys spixii e Hydromedusa tectifera (Chelidae) en el sur del Brasil

DOI:

https://doi.org/10.15446/caldasia.v44n1.87376

Palabras clave:

freshwater turtle, food strategy, trophic niche, Black Spiny-necked Turtle, South American Snake-necked Turtle (en)
tortuga de agua dulce, estrategia alimentaria, nicho trófico, tortuga negra de cuello espinoso, tortuga de cuello de serpiente sudamericana (es)

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Data about the diet of the freshwater turtles Acanthochelys spixii and Hydromedusa tectifera from southern Brazil populations remain little known.  In this context, the digestive tract of 21 A. spixii and 20 of H. tectifera individuals from three municipalities in the state of Rio Grande do Sul, Brazil were examined. The food items were identified at the lowest possible taxonomic level, quantified, and conserved in ethanol 70°GL. The frequency of occurrence (F %) and volume percentage (V %) were estimated, as well as the food importance index (IAi %). The range of the trophic niche and the feeding strategy of both species were analyzed. The diet of A. spixii and H. tectifera was compared through the Mann-Whitney test (P < 0.05). Both species presented a generalist food strategy, consuming mainly insects, represented by Hemiptera, Odonata, Coleoptera, and Diptera. There was no significant difference in the volume of items consumed by both species (Mann-Whitney test, z =-0.387, P = 0.69). Concerning the trophic niche range, we observed low values for both species, it was of 0.41 for A. spixii and 0.39 for H. tectifera suggesting a more restricted diet with uniformity in food consumption, however, we highlight that a more restricted diet does not suggest a trophic specialization, because the availability of food items have variation in time and space. The study contributed information on the diet of species in the region, generating data that can be used in programs for the conservation of species and their habitats.

La dieta de las tortugas de agua dulce Acanthochelys spixii e Hydromedusa tectifera es poco conocida en el sur del Brasil. Se examinó el tracto digestivo de 21 individuos de A. spixii y 20 de H. tectifera de tres municipios del estado de Rio Grande do Sul, Brasil. Los ítems consumidos fueron identificados al nivel taxonómico más bajo posible, cuantificados y conservados en etanol de 70 °GL. Se obtuvieron las variables frecuencia de ocurrencia (F %) y el volumen porcentual (V %) de cada categoría de presa y se calculó el índice de importancia alimentaria (IAi %). Se analizó la amplitud del nicho trófico y la estrategia de alimentación de ambas especies. Las dietas se compararon usando la prueba de Mann-Whitney (P < 0,05). Ambas especies presentaron una estrategia de alimentación generalista, consumiendo principalmente insectos Hemiptera, Odonata, Coleoptera y Diptera. No hubo diferencias significativas en el volumen de ítems consumidos por ambas especies (Mann-Whitney, z = -0,387, P = 0,69). En relación con la amplitud de nicho trófico observamos valores bajos para ambas especies, 0,41 en A. spixii y 0,39 en H. tectifera, lo que sugiere una dieta más restringida con uniformidad en el consumo de alimentos, sin embargo, una dieta más restringida no sugiere una especialización trófica, ya que la disponibilidad de los elementos alimenticios tiene variación espaciotemporal. El estudio aportó información sobre la dieta de las especies de la región, generando datos que pueden utilizarse en programas de conservación de las especies y sus hábitats.

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Cómo citar

APA

Medeiros Chaviel, B., Silveira Mascarenhas, C., Corrêa, F., Costa Silveira, E., Afonso Coimbra, M. A. y Müller, G. (2022). Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil. Caldasia, 44(1), 178–183. https://doi.org/10.15446/caldasia.v44n1.87376

ACM

[1]
Medeiros Chaviel, B., Silveira Mascarenhas, C., Corrêa, F., Costa Silveira, E., Afonso Coimbra, M.A. y Müller, G. 2022. Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil. Caldasia. 44, 1 (ene. 2022), 178–183. DOI:https://doi.org/10.15446/caldasia.v44n1.87376.

ACS

(1)
Medeiros Chaviel, B.; Silveira Mascarenhas, C.; Corrêa, F.; Costa Silveira, E.; Afonso Coimbra, M. A.; Müller, G. Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil. Caldasia 2022, 44, 178-183.

ABNT

MEDEIROS CHAVIEL, B.; SILVEIRA MASCARENHAS, C.; CORRÊA, F.; COSTA SILVEIRA, E.; AFONSO COIMBRA, M. A.; MÜLLER, G. Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil. Caldasia, [S. l.], v. 44, n. 1, p. 178–183, 2022. DOI: 10.15446/caldasia.v44n1.87376. Disponível em: https://revistas.unal.edu.co/index.php/cal/article/view/87376. Acesso em: 23 abr. 2024.

Chicago

Medeiros Chaviel, Bruna, Carolina Silveira Mascarenhas, Fabiano Corrêa, Emily Costa Silveira, Marco Antônio Afonso Coimbra, y Gertrud Müller. 2022. «Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil». Caldasia 44 (1):178-83. https://doi.org/10.15446/caldasia.v44n1.87376.

Harvard

Medeiros Chaviel, B., Silveira Mascarenhas, C., Corrêa, F., Costa Silveira, E., Afonso Coimbra, M. A. y Müller, G. (2022) «Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil», Caldasia, 44(1), pp. 178–183. doi: 10.15446/caldasia.v44n1.87376.

IEEE

[1]
B. Medeiros Chaviel, C. Silveira Mascarenhas, F. Corrêa, E. Costa Silveira, M. A. Afonso Coimbra, y G. Müller, «Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil», Caldasia, vol. 44, n.º 1, pp. 178–183, ene. 2022.

MLA

Medeiros Chaviel, B., C. Silveira Mascarenhas, F. Corrêa, E. Costa Silveira, M. A. Afonso Coimbra, y G. Müller. «Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil». Caldasia, vol. 44, n.º 1, enero de 2022, pp. 178-83, doi:10.15446/caldasia.v44n1.87376.

Turabian

Medeiros Chaviel, Bruna, Carolina Silveira Mascarenhas, Fabiano Corrêa, Emily Costa Silveira, Marco Antônio Afonso Coimbra, y Gertrud Müller. «Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil». Caldasia 44, no. 1 (enero 3, 2022): 178–183. Accedido abril 23, 2024. https://revistas.unal.edu.co/index.php/cal/article/view/87376.

Vancouver

1.
Medeiros Chaviel B, Silveira Mascarenhas C, Corrêa F, Costa Silveira E, Afonso Coimbra MA, Müller G. Diet of Acanthochelys spixii and Hydromedusa tectifera (Chelidae) in the southern Brazil. Caldasia [Internet]. 3 de enero de 2022 [citado 23 de abril de 2024];44(1):178-83. Disponible en: https://revistas.unal.edu.co/index.php/cal/article/view/87376

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CrossRef citations2

1. Ezequiel Palumbo, Andrea Servián, María Julia Cassano, Julia Inés Diaz. (2024). Camallanine Nematodes Parasitizing Endangered Freshwater Turtles from South America, with the Description of Two New Species. South American Journal of Herpetology, 30(1) https://doi.org/10.2994/SAJH-D-21-00051.1.

2. Carolina Silveira Mascarenhas, Bruna Medeiros Chaviel, Fabiana Fedatto Bernardon, Juliana Hinz Wolter, Marco Antônio Afonso Coimbra, Gertrud Müller. (2022). Gastrointestinal helminths associated with three species of freshwater turtles in the Pampa biome, southern Brazil. Parasitology Research, 121(1), p.225. https://doi.org/10.1007/s00436-021-07361-y.

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