During investigations of an inundated opencast sulphur mine (an open, deep water habitat with a relatively small littoral area) only five species of breeding water birds were recorded. The density of breeding great crested grebes Podiceps cristatus was relatively high (c. 1.0-1.1 pairs 10 ha of water, and 1.6-1.8 pairs ha of the macrophyte area) although fish density was very low. High water tr...

Amphibian and mammalian blood was washed in isotonic saline, fixed in glutaraldehyde, and then stained in the ATPase medium of Wachstein and Meisel. The blood cells were subsequently postfixed in osmium tetroxide, embedded in epoxy resins, and studied by electron microscopy. The plasma membranes of amphibian erythrocytes, from the newt Triturus cristatus and the frog Rana esculenta, were staine...

We studied parental provisioning and chick growth rates of Cassin’s auklet Ptychoramphus aleuticus at Triangle Island, British Columbia, Canada, from 1996 to 1999. Auklet reproductive performance and ocean climate conditions during these years were highly variable, and reflected in the diet composition. Chick growth was maximal when the diet was predominated by copepods, in particular Neocalanu...

Differences in day length may act as a critical factor in bird biology by introducing time constraints in energy acquisition during winter. Thus, differences in day length might operate as a main determinant of bird abundance along latitudinal gradients. This work examines the influence of day length on the abundance of wintering crested tits (Lophophanes cristatus) in 26 localities of Spanish ...

Pond-breeding amphibians are deme-structured organisms with a population genetic structure particularly susceptible to demographic threats. We estimated the effective number of breeding adults (Nb) and the effective population size (Ne) of the European urodele amphibians Triturus cristatus (the crested newt) and T. marmoratus (the marbled newt), using temporal shifts in microsatellite allele fr...

Opioid drugs are used to manage moderate severe pain in mammals and avian species. In dosing opioids for a particular species, it is optimal use regimens based on pharmacokinetics or pharmacodynamics studies conducted the same species as variability physiology among different may result differences drug pharmacodynamics. Unfortunately, typically extrapolated from closely related even mammals, w...

Current ecological surveys for great crested newts are time-consuming and expensive and can only be carried out within a short survey window. Additional survey methods which would facilitate the detection of rare or protected species such as the great crested newt (Triturus cristatus) would be extremely advantageous. Environmental DNA (eDNA) analysis has been utilized for the detection of great...

The current research work was conducted to compare the external and internal egg quality parameters of different breeds peacock. For this purpose, 130 freshly laid eggs 2 species 11 (n = 10 per breed) were obtained from captive breeding facilities. In Pavo muticus muticus, higher weight (106.57 ± 0.69), length (7.21 0.01), width (5.31 breadth (28.18 volume (100.84 0.48) recorded. However, shape...