Host-Parasite Relationship Octopus Tehuelchus - Aggregata Valdessensis in Patagonian Coast, Southwestern Atlantic Ocean
2022; RELX Group (Netherlands); Linguagem: Inglês
10.2139/ssrn.4314515
ISSN1556-5068
AutoresNuria Vázquez, Natusha Glasinovich, Nicolas Ortíz, Camino Gestal, Julián Pontones, Carmen Gilardoni, Florencia Cremonte,
Tópico(s)Crustacean biology and ecology
ResumoHistolopathology associated with the apicomplexan Aggregata valdessensis on wild population of Octopus tehuelchus was studied. Moreover, to analyze the impact of the prevalence and infection intensity on the size, sex, maturity stages, condition index and total hemocyte counts on wild O. tehuelchus, Generalized Linear Models (GLMs) were applied. Kruskal–Wallis (KW) test was used to compare growth parameter (RNA/DNA ratios) in infected and no infected octopuses. Lesions including hypertrophy of host cell and destruction of the tissue organ architecture as well as the replacement of host tissue by parasites were associated with infection. The infection caused an inflammatory defensive response in form of hemocytic infiltration and encapsulation. Prevalence of apicomplexan increased with octopus size (GLM, t = 2.68; p = 0.007). Infection intensity was significant higher in males octopus (GLM, t = 2.69; p = 0.009) and decreased at higher temperatures in both sex (GLM, t = -2.42; p = 0.018). The digestive gland condition index did not significantly vary with infection intensity, and no significant relationship between total hemocyte counts and coccidian infection was found (Lineal Model, t = 0.46; p = 0.64). The acid nucleic ratio was significantly lower in octopuses infected by A. valdessensis (Kruskal Wallis test, H = 4.8; p = 0.02), suggesting a detrimental effect on O. tehuelchus growth caused by the coccidian.
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