Diverzita monogeneí sladkovodních ryb jezera Turkana, Keňa: současný stav a perspektivy

Bc. Lucie Šafarčíková

Master's thesis

Diversity of monogeneans from freshwater fishes of the Turkana Lake, Kenya: current state and prospects

Abstract:

V rámci systematické studie zaměřené na monogenea (Dactylogyridae) sladkovodních ryb jezera Turkana (Keňa) bylo na 17-ti druzích hostitelských ryb nalezeno 34 druhů monogeneí, z nichž 22 pravděpodobně představuje druhy nové pro vědu. Zbývajících 12 druhů patří mezi dříve popsané taxony, které však byly na území Keni zaznamenány poprvé. Nalezená monogenea reprezentovala těchto 12 rodů: Afrocleidodiscus (2 druhy), Annulotrema (5 druhů), Bagrobdella (1 druh), Bouixella (1 druh), Cichlidogyrus (3 druhy), Dactylogyrus (9 druhů), Dogielius (2 druhy), Enterogyrus (4 druhy), Heterotesia (1 druh), Nanotrema (1 druh), Protoancylodiscoides (1 druh) a Quadriacanthus (4 druhy). V rámci jednoho hostitele bylo nejvíce druhů nalezeno na žábrách parmičky Labeo horie (7 druhů rodu Dactylogyrus a 2 druhy rodu Dogielius). Převážná část monogeneí byla lokalizována na žábrách a pouze 4 druhy rodu Enterogyrus byly nalezeny v žaludku ryb čeledi Cichlidae. Celkem 5 druhů vyšetřených ryb představuje nové hostitele pro následující druhy monogeneí: Clarias gariepinus pro Quadriacanthus aegypticus, Labeo horie pro Dactylogyrus senegalensis, Mormyrus kannume pro Bouixella mormyrume, Sarotherodon galilaeus pro Enterogyrus malmbergi a Tilapia zillii pro Enterogyrus coronatus.

Abstract:

During a systematic survey of monogeneans (Dactylogyridae) of freshwater fishes from the Turkana Lake (Kenya), 34 monogenean species were recorded on/in 17 species of host fishes. Twenty-two of them probably represent species new for science. Twelve species represent previously described taxa and all of them are reported from Kenya for the first time. The monogenean species found were represented by the following 12 genera: Afrocleidodiscus (2 species), Annulotrema (5 species), Bagrobdella (1 species), Bouixella (1 species), Cichlidogyrus (3 species), Dactylogyrus (9 species), Dogielius (2 species), Enterogyrus (4 species), Heterotesia (1 species), Nanotrema (1 species), Protoancylodiscoides (1 species) and Quadriacanthus (4 species). Most species were collected from the gills of Labeo horie (7 species of Dactylogyrus and 2 species of Dogielius). The majority of the monogenean species found were situated on the gills; the only monogeneans recorded from the stomach were 4 species of Enterogyrus from fishes of Cichlidae. Five species of the examined fishes represent new hosts for the following monogenean species: Clarias gariepinus for Quadriacanthus aegypticus, Labeo horie for Dactylogyrus senegalensis, Mormyrus kannume for Bouixella mormyrume, Sarotherodon galilaeus for Enterogyrus malmbergi and Tilapia zillii for Enterogyrus coronatus.

Keywords

Monogenea, Dactylogyridae, Kenya, Afrocleidodiscus, Annulotrema, Bagrobdella, Bouixella, Cichlidogyrus, Dactylogyrus, Dogielius, Enterogyrus, Heterotesia, Nanotrema, Protoancylodiscoides, Quadriacanthus

Language used: Czech

Date on which the thesis was submitted / produced: 17. 5. 2010

Thesis defence

• Date of defence: 10. 6. 2010
• Supervisor: Mgr. Eva Řehulková, Ph.D.

Masaryk University

Faculty of Science

Master programme / field:
Biology / Systematic Biology and Ecology