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1

Reduced diversity and stability of chironomid assemblages [Chironomidae, Diptera] as the effect of moderate stream degradation

100%
Koperski P.
Polish Journal of Ecology
|
2009
|
tom 57
|
nr 1
125-138
Great taxonomic and functional diversity of larval chironomids make them potentially very useful group for testing the relationships between degradation of freshwaters and diversity and stability of freshwater faunal assemblages. The main aim of the study was to evaluate influences of moderate degradation on taxonomic composition of larval chironomid assemblages in lowland streams, on their biological and functional diversity as well as on assemblage temporal stability. Larval chironomids were collected once a month from March through to October at seven sampling sites located on three, third-order lowland streams Orzysza, Święcek and Konopka (38.6 km, 28.5 km and 20.5 km in length, respectively) in Mazurskie Lakeland (north-eastern Poland). Sampling sites differed in terms of type of catchment utilization and distance from potential pollution sources. Totally 10 060 individuals of 92 chironomid taxa were found in the streams – 48 were identified to the species level, the rest of them were identified as higher taxa. The most diverse chironomid fauna were found in stream Orzysza – 72 taxa, while both in streams Święcek and Konopka 52 taxa were found. The most important variable determining taxonomic composition of larval chironomids in studied streams was seasonality. Percentages of common, numerous and frequent species sampled at the stations diverse in terms of degradation did not differ significantly. An only exception was Chironomus sp. gr. plumosus – percentages of its larvae at degraded stations were significantly higher. Species richness, rarity, taxonomic diversity, taxonomic distinctness and temporal stability of chironomids were significantly lower in degraded habitats, while taxonomic composition of assemblages sampled at sites divergent in terms of degradation did not differ. Ecologically specialized species had been represented in higher percentages in more natural sites, which means, that assemblages were also more diverse functionally therein. It clearly shows increased ecological uniformity of degraded habitats when compared with more natural ones.
2

A list of fish parasitic worms collected off Adelie Land [Antarctic]

80%
Zdzitowiecki K., Rocka A., Pisano E., Ozouf-Costaz C.
Acta Parasitologica
|
1998
|
tom 43
|
nr 2
A list of internal parasitic worms occurring in four fish species in environs of the Adelie Land is given. In total, 20 forms are listed, including 14 species occurring in fishes in the adult stage (11 Digenea, 2 Acanthocephala, 1 Nematoda) and six larval forms (3 Cestoda, 1 Acanthocephala, 2 Nematoda). Twelve species occurring as adults and two larval forms are specifically determined. One digenean species is not identified even to a family, one acanthocephalan species and one nematode larval form are determined to the genera, three cestode larval forms are determined only to the higher taxa. All species and larval forms previously recorded in the investigated area are present in the material; eleven ones are reported from environs of the Adelie Land for the first time.
3

The Reproductive and Developmental Biology of Parasitic Platyhelminths. The International Satellite Symposium 10 September 1998, Olsztyn, Poland

80%
Swiderski Z.
Acta Parasitologica
|
1999
|
tom 44
|
nr 1
4
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Prevalence of cestodes in carnivorous animals and their larval forms in pigs and cattle

80%
Gundlach J. L., Samojlowicz M., Sadzikowski A. B.
Wiadomości Parazytologiczne
|
1998
|
tom 44
|
nr 3
5

The tetraphyllidean cercoids from teleosts occurring in the Weddel Sea [Antarctic]

70%
Rocka A.
Acta Parasitologica
|
1999
|
tom 44
|
nr 2
In total, 400 teleosts of 32 species (7 families) were examined. Cercoids of Tetraphyllidea (about 41 thousands) occurred in 204 host specimens of 26 species. Three morphological forms of cercoids were recognized. They were cercoids with bothridia divided into two and three loculi, and cercoids with subcylindrical bothridia. All forms were found in fishes from the Weddell Sea for the first time. Cercoids with bilocular bothridia were the most abundant form (90.7% of all specimens); cercoids with trilocular bothridia and cercoids with subcylindrical bothridia were less numerous (6.6 and 2.7% of all specimens, respectively). Cercoids concentrated in obligatory or facultative predators, whereas pelagic and bentho-pelagic fishes feeding on crill, were rarely infected. Chionodraco hamatus was the most heavily infected - prevalence 100%, relative density 903.
6

Endoparasitic worms of Harpagifer antarcticus Nybelin, 1947 off the South Shetland Islands [Antarctic]

70%
Zdzitowiecki K., Zadrozny T.
Acta Parasitologica
|
1999
|
tom 44
|
nr 2
Fifty specimens of Harpagifer antarcticus Nybelin, 1947 caught off King George Island in Admiralty Bay (44) and off Elephant Island (6), were examined for endoparasitic worms. Fifteen or sixteen species and larval forms were found, including three species of Digenea (Macvicaria georgiana, Genolinea bowersi and Gonocerca phycidis), four forms of larval Cestoda (three tetraphyllidean cercoids and diphyllobothriid plerocercoid), five species of Acanthocephala (Aspersentis megarhynchus, Metacanthocephalus dalmori, Corynosoma arctocephali cystacanth, C. hamanni cystacanth and C. pseudohamanni cystacanth) and three or four species of Nematoda, Ascarophis nototheniae, Pseudoterranova decipiens third stage larva (L3) and Contracaecum sp. L3 = ?C. osculatum and ?C. radiatum. Only some of the specimens of the two digenean species, M. georgiana and G. bowersi, were fully mature (containing eggs). No one form is specific for Harpagifer, eight have not previously been reported from H. antarcticus. The total prevalence of infection was 68% with a maximum intensity 19 worms. The most numerous parasite in Admiralty Bay was G. bowersi (67 specimens) occurring with a prevalence of 23%; A. megarhynchus was less numerous (19 specimens), but occurred with a higher prevalence, 25%. A list of internal parasitic worms of H. antarcticus (according to present and literature data, probably 17 forms) is compared with that of Notothenia coriiceps occurring in the similar (partly the same) environment at King George Island (27 forms); this is 63% of forms recorded in H. antarcticus. All parasites of H. antarcticus occur in N. coriiceps. A list of parasitic worms recorded in three harpagiferid species is given. The role of harpagiferids as intermediate or paratenic hosts of parasitic worms appears to be more important than a role as definitive hosts.
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