Parasites of loaches (Cobitidae, Teleostei) in a hybrid zone: do the parental species and their hybrid progeny share the same helminths community?
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1
University of Wrocław, Department of Parasitology, Poland
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2
University of Wrocław, Museum of Natural History, Poland
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3
Laboratory of Fish Genetics, Institute of Animal Physiology and Genetics (ASCR), Czechia
Cobitis taenia hybrid complex in Poland represent two species: spined loach C. teania, and Danubian loach C. elongatoides which are accompanied by various hybrid forms of three ploidy levels and different genome composition. In particular localities one of parental species coexist together with clonally reproducing hybrids. However, the most published parasitological data from Central and Eastern Europe concern C. taenia which, till 1996, was commonly regarded as the only widely distributed member of genus Cobitis in the area. The aim of the study was to find potential differences in helminths fauna occurring in loaches belonging to such complex populations within a hybrid zone in Oder River system. Studies on parasitic helminths of native loaches were conducted from 2013 to 2015. A total of 446 fishes including 251 C. taenia and 195 C. elongatoides were caught by electro-fishing at seven localities in south-western Poland. All individuals were subjected to standard helminthological dissection. Isolated parasites belonged to 4 higher taxa: Digenea, Cestoda, Nematoda and Acanthocephala. A total of 1177 parasites representing 11 taxa were found in 151 individuals of C. taenia (prevalence 60,2%), while 530 parasites belonging to 12 taxa were found in 111 C. elongatoides (56,92%). Nine taxa of parasites occurred in both loach species and hybrids: Gyrodactylus latus, Tylodelphys clavata, Metorchis xanthosomus, Holostephanus cobitidis, Apophallus muehlingi, Allocreadium transversale, Raphidascaris acus and unidentified cysts of Nematoda). Pseudocapillaria tomentosa, Caryophyllaeus laticeps and Diplostomum spp. were detected only in populations where C. elongatoides present, while Posthodiplostomum cuticola and Ligula colymbi were found in loaches of populations with C. taenia. Some sources of detected differences, including genetic structure of host populations and/or site-specific environmental factors which can influence helminths assemblages were discussed.
Keywords:
Cobitis taenia,
Cobitis elongatoides,
hybrid forms,
helminths assemblages,
Oder River system
Conference:
XVI European Congress of Ichthyology, Lausanne, Switzerland, 2 Sep - 6 Sep, 2019.
Presentation Type:
Poster
Topic:
ECOLOGY AND LIFE CYCLES
Citation:
Kuśmierek
N,
Stefaniak
J,
Skorzewski
G,
Janko
K,
Kotusz
J and
Popiolek
M
(2019). Parasites of loaches (Cobitidae, Teleostei) in a hybrid zone: do the parental species and their hybrid progeny share the same helminths community?.
Front. Mar. Sci.
Conference Abstract:
XVI European Congress of Ichthyology.
doi: 10.3389/conf.fmars.2019.07.00025
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Received:
30 May 2019;
Published Online:
14 Aug 2019.
*
Correspondence:
Mx. Marcin Popiolek, University of Wrocław, Department of Parasitology, Wrocław, Silesian, 50-137, Poland, marcin.popiolek@uwr.edu.pl