STUDIES of the regeneration of feathers after plucking show the existence of considerable differences in the time intervals before the commencement of regeneration in individual feathers. In normal moulting, the development of the new feather starts before the old feather is shed, and as growth of the new feather continues and it emerges from the follicle, it may frequently be seen projecting w...

Precopulatory guarding in Crustacea is usually analyzed as a male decision problem. We suggest an alternative possibility that precopula is established as a result of intersexual conflict over precopula duration. Such a conflict can be expected when the male optimum for precopula duration exceeds the female optimum. As a result, males should start precopulatory attempts earlier, while females s...

Abstract Bird migration is a highly complex, regulated process, of which timing an essential element. The influenced by moult, age, sex and food the birds, as well distance between breeding wintering sites. In this study, we used data from ringing station on shores Lake Baikal to investigate factors influencing for species with different moulting strategies, sites feeding habits. general, found...

Moulting behaviors in trilobites are a crucial strategy during development. Previous studies have demonstrated inter-and intraspecific variability of moulting behavior trilobites. Currently, ecdysial motifs for considered not stable even within species and fewer detailed dealt with single trilobite Here large sample meraspid to holaspid exuviae Arthricocephalites xinzhaiheensis (131 specimens) ...

Flight feather moult in small passerines is realized in several ways. Some species moult once after breeding or once on their wintering grounds; others even moult twice. The adaptive significance of this diversity is still largely unknown. We compared the resistance to mechanical fatigue of flight feathers from the chiffchaff Phylloscopus collybita, a migratory species moulting once on its bree...

The mode of growth of several tissues in Gryllus bimaculatus was investigated during postembryonic development by cytophotometric methods. In contrast to the situation in holometabolous insects, the tissues growing by endomitosis reach only moderate levels of polyploidy. In this case the growth of tissues is achieved by mitotic divisions of small cells with subsequent polyploidization. The time...

Overlapping moult and reproduction might be crucial for long-distance migratory birds, which are time-constrained to complete these energy-demanding functions before the onset of migration. However, proximate factors modulating the potential trade-off between moult and breeding, such as haemoparasite infection and stress, have not been studied in wild avian populations. We investigated the occu...