Interrelations between Cottus poecilopus Heckel and C. gobio L. (Pisces) in a Regulated North Swedish River

Oikos ◽  
1969 ◽  
Vol 20 (2) ◽  
pp. 540 ◽  
Author(s):  
Sten Andreasson
Keyword(s):  
Cottus Poecilopus

Gyrodactylus species (Monogenea) infecting alpine bullhead (Cottus poecilopus Heckel, 1837) in Norway and Slovakia, including the description of Gyrodactylus mariannae sp. nov.

2008 ◽  
Vol 53 (3) ◽  
Author(s):  
Anja Winger ◽  
Haakon Hansen ◽  
Lutz Bachmann ◽  
Tor Bakke
Keyword(s):  
New Species ◽  
Nucleotide Sequences ◽  
Internal Transcribed Spacers ◽  
Type Material ◽  
Nuclear Rdna ◽  
Rdna Cluster ◽  
Cottus Gobio ◽  
Cottus Poecilopus ◽  
A New Species ◽  
North Norway

AbstractGyrodactylus specimens infecting the skin and fins of two alpine bullhead (Cottus poecilopus) populations from the rivers Signaldalselva (North Norway) and Rena (South-East Norway) were characterized by both morphological and molecular means. Morphometrical differences were minor and the nucleotide sequences of the internal transcribed spacers (ITS) of the nuclear rDNA cluster were identical for parasites from both localities. Based on earlier descriptions, the relatively closest species are Gyrodactylus hrabei Ergens, 1957, described from common bullhead (Cottus gobio) in Slovakia and G. sp. Malmberg, 1973, from alpine bullhead in Sweden. The Norwegian Gyrodactylus specimens from the two alpine bullhead populations were morphometrically different from both the type material of G. hrabei from Slovakia and newly collected Gyrodactylus specimens from alpine bullhead in two Slovakian localities. The Slovakian Gyrodactylus specimens were found to be identical with type material of G. hrabei. The nucleotide sequences of the ITS of the Norwegian Gyrodactylus species were different from the Slovakian material. Hence, the Norwegian Gyrodactylus specimens from the alpine bullhead represent a new species, G. mariannae sp. nov.

Beaver impact on stream fish life histories: the role of landscape and local attributes

2014 ◽  
Vol 71 (11) ◽  
pp. 1603-1615 ◽  
Author(s):  
Aneta Bylak ◽  
Krzysztof Kukuła ◽  
Józef Mitka
Keyword(s):  
Life History ◽  
Life Histories ◽  
Salmo Trutta ◽  
Fish Assemblages ◽  
Stream Fish ◽  
Beaver Ponds ◽  
Eurasian Beaver ◽  
Brown Trout Salmo Trutta ◽  
Cottus Poecilopus ◽  
Stream Fish Assemblages

The Eurasian beaver (Castor fiber) has been reintroduced into the Carpathian Mountains and has once again become an important factor for modifying streams. Forty-three sampling sites were compared with 10 reference sites in streams not settled by beavers. Models related to the impacts of beavers on various fish life history stages and a model presenting attributes influencing the ichthyofauna structure in streams with and without beavers were generated. Significant differences in the fish species composition were found between beaver ponds versus the running sections of streams. The changes associated with pond aging caused decrease of Siberian bullhead (Cottus poecilopus) density. For brown trout (Salmo trutta), beaver ponds were the only location where large individuals were found, while the upstream parts of the beaver complexes provided spawning habitat and an area for fry growth. Common minnow (Phoxinus phoxinus) and stone loach (Barbatula barbatula) had higher density in ponds than in streams. The decisive factors for the ichthyofauna in the mountain streams settled by beavers were local attributes related to beaver activity. Our results illustrate interactions among beaver, landscape context, and fish life history in influencing the response of the stream fish assemblages to beaver recolonization. It also helps answer the question of how Eurasian beaver influence stream fish assemblages, at a much larger scale than previous studies.

Broad-scale phylogeography of the Palearctic freshwater fish Cottus poecilopus complex (Pisces: Cottidae)

2008 ◽  
Vol 48 (3) ◽  
pp. 1244-1251 ◽  
Author(s):  
Ryota Yokoyama ◽  
Valentina G. Sideleva ◽  
Sergei V. Shedko ◽  
Akira Goto
Keyword(s):  
Freshwater Fish ◽  
Cottus Poecilopus ◽  
Broad Scale
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