The aim of this study was to qualify the sexual size dimorphism at both inter and intra-population levels a copepod species, Cyclops vicinus, populations living in small-scale geographical range. Sexual is evaluated by ratio female male total length. But, deep insight into we assumed that more difference between same measurements on body from different sexes lead rate. samples were taken four w...

macrocyclops albidus and cyclops vicinus are the two important copepods living in hazar lake.for this study, 50 females for each species were collected. samples were taken between december 1999 andmarch 2000. length (pl), width (pw), and height (ph) of prosome and length (ul) and width (uw) ofurosome were measured in each female and subsequently, the following ratios pl/pw, pl/ph, pw/ph,pl/ul a...

Marssoniella elegans Lemmermann, 1900, a parasite of ovarial tissues of the copepod Cyclops vicinus Uljanin, 1875, was studied as a representative of aquatic-clade microsporidia which form "heteroinfectious spores" (spores not infective to the original host as opposed to "homoinfectious spores" which are infective for the original host) and which thus should require an alternate host. Several s...

During the first three quarters of this century, the trophic state ofLake Constance changed from oligotrophic to meso-/eutrophic conditions. The response of crustaceans to the eutrophication process is studied by comparing biomasses of crustacean zooplankton from recent years, i.e. from 1979-1995, with data from the early 1920s (AUERBACH et a1. 1924, 1926) and the 1950s (MUCKLE & MUCKLEROTTENGA...

Hydrological changes affect not only the physicochemical factors and habitat structure of river ecosystems, but also biological communities sensitive to environmental changes, such as zooplankton. In this study, we investigate effects weir opening on variables topographic structures at Sejong Weir in South Korea monitor resulting distribution zooplankton community. led increased dissolved oxyge...