A Bayesian analysis of the parasitic ecology in Jenynsia multidentata (Pisces: Anablepidae)

MARTIN MIGUEL MONTES; SERGIO MARTORELLI

IHERINGIA. SéRIE ZOOLOGIA

FUNDACAO ZOOBOTANICA RIO GRANDE SUL

Lugar: Porto Alegre; Año: 2017

0073-4721

Jenynsia multidentata Jenyns, 1842 (one-sided livebearers) are euryhaline viviparous fi sh of small size, used in the laboratory experiment, important as resource for biological control of mosquito?s larva and a key species to recover eutrophic lakes. Works have been published dealing with parasite biodiversity of this host, but little has been studied about the parasite community ecology. From early 2009 to ends of 2010 specimens of J. multidentata were collected from two places, the Salado Relief Channel (S.R.C.) on Samborombón Bay and the Sauce Chico River near to the city of Bahia Blanca (B.B.). All fi sh were sexed, measured and grouped into sizes/age classes. The fi shes from both sites harbored 16 parasitic species: nine digenean, one monogenean, one metacestode, one acanthocephalan, two nematode and two copepods. Lecithaster confusus Odhner, 1905, the metacercariae Hemiuridae gen. sp. indet., metacercariae Thylodelphys sp. (inside the eye), Glossocercus sp. nematode L4 (intestine) and Ergasilus sieboldii Nordmann, 1832 are new records for the host. The high number of larval stages made of this fi sh a link between micro and macroecosystems. The size 2 had the higher biodiversity in both sites, which could be the most suitable age to store the maximal number of parasite of the environment and have a more equitability in their distribution on the host. In B.B. some parasites had higher prevalence and mean abun dance due to the small size of the waterbody compared with the S.R.C. Despite that, in S.R.C. exist a higher specifi c richness and biodiversity due the daily fl ow of saline and freshwater and proximity of the sample site to the mouth of the channel in the bay. This is the fi rst approximation to an analysis of the parasitic ecology on this host.