The influence of black spot disease on the relative condition factor of Astyanax paranae Eigenmann, 1914 (Characiformes: Characidae) in Brazilian subtropical streams
Acta sci., Biol. sci
;
43: e56164, 2021. ilus, tab, graf
Article
Dans Anglais
| LILACS, VETINDEX
| ID: biblio-1461009
ABSTRACT
Environmental disturbances and their consequences require constant studies to understand how communities and their ecological relationships respond to these processes. Through analysis of the host-parasite relationships, it is observed that the effect of these disturbances is variable and can change the physiology or behavior of organisms. Black spot disease, caused by endoparasitic helminths, is a pathology observed in natural environments, however, there is not much information about the consequences of this infestation. We separated the specimens from each stream into parasitized and non-parasitized groups, which were subjected to biometric analysis. The biometrics involved cysts count and weight-length measures, which were used to analyze the average relative condition factor. Additionally, we correlate these measures with the parasitic burden of infected individuals. Finally, the parasitized individuals were submitted to histological sections to recognize the parasite. The results demonstrate a low physiological condition in the parasitized group, when compared with non-parasitized groups from the same stream and from different streams. This suggests that pollution, in addition to effects of infestation worsen the fish condition. Besides, the parasite burden was negatively correlated with the condition factor, weight and length measures. We conclude that the parasite burden negatively affects Astyanax paranae individuals´ physiological condition and that trematodes also occur in polluted environments.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Biométrie
/
Rivières
/
Écologie
/
Characidae
Limites du sujet:
Animaux
Pays comme sujet:
Amérique du Sud
/
Brésil
langue:
Anglais
Texte intégral:
Acta sci., Biol. sci
Thème du journal:
Biologie
Année:
2021
Type:
Article
Pays d'affiliation:
Brésil
Institution/Pays d'affiliation:
Universidade Federal de São Carlos/BR
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