Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 22

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  Hydrachnidia
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Small water bodies are very diversified environmentally, and also characterized by a considerable variation range of environmental parameters. these two features are responsible for the fact that the fauna of water mites is characterized by a considerable species diversity and that eurytopic species are prevalent. Due to the eurytopic character of the species it is very difficult to define the rules governing their environmental distribution, which probably often has a local character. The present study is an attempt at analyzing this problem, focusing on water mite fauna of kettle holes in Rostock surroundings (Germany). The main factor diversifying the fauna of studied reservoirs is their trophism. Correspondence analysis distinguished three separate groups among the reservoirs. the isolation of the reservoirs was an important factor diversifying the water mite fauna.
The results of a faunistic survey of water mites from five spring areas in Macedonia are presented. Only in three investigated areas were water mites found. 13 species were identi fied, 2 of which ( Lebertia longiseta and Hygrobates setosus ) are reported as new for the Balkan Peninsula, and 1 ( Lebertia porosa ) as a new for Macedonia. The ecological significance of the researches is briefly discussed
Many aquatic insect species, including aquatic Hemiptera, are parasitized by water mite larvae. Although this situation may cause damaging impacts to the hosts, the mites can disperse and colonize new localities in this way. Little is known about the frequency of water mite ectoparasitism amongst the aquatic Hemiptera in Turkey. In this study, larval water mite parasitism on aquatic Hemiptera, which have been collected from different localities in Turkish Thrace, was evaluated. It was found that only nine individuals, belonging two different species in a total of 367 hemipteran specimens, were parasitized by larval water mites. Furthermore, variations in sizes and shapes of the mites on the waterscorpion Ranatra linearis Linne, 1758 and Nepa cinerea Linne, 1758 were determined. These are the first records for larval mite parasitism on R. linearis and N. cinerea in Turkish Thrace.
Lobelian lakes are clean, oligotrophic, usually non-flow-through lakes, characterized by a small size and the presence of specific flora (Lobelia dortmanna, Isoëtes lacustris, litorella uniflora, Myriophyllum alterniflorum). This type of lakes has been very rarely studied with regard to water mite fauna living in them. The aim of the present study was to partially fill the considerable existing gap in data by studying the distribution of water mites (Hydrachnidia) in the basin of a lobelian lake (Kąpka Lake) situated in Western Pomerania. The research was conducted during the period from May to August 2011, at monthly intervals. The samples were collected from the depths: 0.1 – 5–6 m. in total, 3271 specimens representing 53 water mite species were collected from the whole Kąpka Lake. The most abundant species included the following (in decreasing order): Limnesia maculata, Hygrobates longipalpis, Lebertia porosa, Forrelia liliacea, Mideopsis orbicularis, Limnesia connata, and Limnochares aquatica. the phenology of the species and their abundance in the Kąpka Lake were characterized by one peak of abundance in the month of July. At every depth of the Kąpka Lake, Limnesia maculata was a dominant species.
Larvae of a vast majority of water mite species are parasites of aquatic insects. Owing to this, they migrate to new localities, and are able to survive unfavourable environmental conditions. This also concerns species from subgenus Arrenurus s. str., parasites of dragonflies. The detailed analysis of this phenomenon, however, has only been possible in the last several years, since the key to the identification of larvae from genus Arrenurus Dug. was published. In 2010, the parasitism of Arrenurus s. str. larvae on dragonflies in the Lake Świdwie reserve (NW Poland) was analysed. Larvae of 9 species of water mites were recorded on 107 imagines of dragonflies from 8 species. The following were identified as hosts of water mites for the first time: Anax imperator, Libellula quadrimaculata, and Leucorrhinia caudalis. The highest prevalence occurred in the case of: Erythromma najas and Lestes dryas (100%), Coenagrion pulchellum (96.5%), and C. puella (80.0%). Coenagrion pulchellum was infested by 9 species of parasites, C. puella by 6, and Erythromma najas and Lestes dryas by three species. The highest number of host species occurred in the case of Arrenurus maculator (5); followed by A. cuspidator, A. batillifer cf., A. bicuspidator, and A. tetracyphus (3 each); A. papillator, A. tricuspidator, and A. bruzelii (2 each), and A. claviger (1). Differentiation of preferences of particular parasites towards various parts of the host body was observed, probably related to the coevolution of parasites and hosts, and competition between the host species. The body sizes of the parasites suggest that approximately 50% of body size growth of water mites from subgenus Arrenurus s. str. occurs at the stage of parasitic larva.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.