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Parasites of the invasive Chinese sleeper Perccottus glenii (Actinopterygii: Odontobutidae) in the region of the first introduction of the Carpathian population

Kvach Yuriy, Kutsokon Yuliya, Janáč Michal, Dykyy Ihor, Dzyziuk Natalia, Dudliv Ivanna, Nazaruk Kateryna

Oceanological and Hydrobiological Studies

2022

Vol. 51, No. 1

1--9

Parasites of the invasive Chinese sleeper (Perccottus glenii) were studied in five different localities at the site of the first introduction of the Carpathian population of this fish. We recorded eight taxa of parasites in Lviv water bodies. The monogenean Gyrodactylus perccotti and the cestode Nippoteania perccotti were recorded in all five lakes studied. These parasites represent Far East species introduced together with their host. Also the copepod Neoergasilus japonicus is a Far East parasite introduced to Europe with its aquaculture vector. Differences between the surveyed bodies of water were mainly related to their local seasonal conditions and watershed characteristics. The current data confirm the presence of co-introduced populations of G. perccotti and N. perccotti, which probably affects the future invasiveness of their host. Due to low acquisition of local parasites, we cannot confirm any significant effect of invasive fish on local parasite assemblages in this region. However, the presence of the non-indigenous copepod, N. japonicus, requires additional attention in the future.

First Records of Conspecific Brood Parasitism in Two Species of Small Passerines : Lesser Whitethroat and Common Linnet

Wuczyński Andrzej, Hałupka Lucyna, Maroń Aleksandra

Polish Journal of Ecology

2021

Vol. 69, nr 2

124--133

We provide the first records of possible conspecific brood parasitism in the lesser whitethroat Sylvia curruca and the common linnet Linaria cannabina, two species of small passerines. In 2018 we found two unusually large clutches, one for each species (8 and 9 eggs, respectively), both containing two distinct egg morphs differing in coloration. Further detailed analysis of egg morphology and brood phenology (in the whitethroat) suggested that the eggs in each nest had been laid by different females. Surprisingly, two seemingly full sized clutches were laid in both nests, a pattern that is unusual in conspecific brood parasitism in passerines, whose nests are typically parasitized with single eggs. Alternatives to conspecific brood parasitism are therefore discussed. We argue that traditional field-based methods, when carefully used, may be sufficient to document brood parasitism recorded during occasional observations. We finally conclude that enlarged broods, resulting from conspecific brood parasitism, are probably more frequent than expected, but they may be often overlooked.