Population decline of carnivore species may happen suddenly, develop rather fast and proceed short-term. For instance, such demise character was known for the European mink in Belarus and Russia (Macdonald et al., 2002; Sidorovich, 2011). Population decline of other carnivore species may pass gradually and less evident, and a considerable decrease in population density may take many more years.
The situation that is characterized by gradual and long-term decline is fairly hard to notice, while manipulating short-term data only. It takes much time to establish a right hypothesis on the decline and to prove the hypothesis. Usually, in such a case, when a population decline appeared to be evident, it is already too late to get a complete dataset to analyze the declining process and to reveal the factors that impacted the population. The polecat Mustela putorius population decline in Belarus was characterized by the mentioned features of gradual and long-term decline (see Sidorovich, 2011). Our results of the study on the polecat demise suggest the following negative factors that are responsible for the population decline.
Continue reading “The causes of long-term decline in the polecat population in Belarus”
A year ago, while publishing the book about badgers and raccoon dogs in Belarus (“Badger and Raccoon dog in Belarus: Population studies with implication for the decline in badgers“, Minsk, 2017), it looked like we knew all possible ways of interference between raccoon dogs and badgers. We registered blocking badgers sleeping in the sett’s hibernating chamber by raccoon dogs with suffocating of the badgers afterwards; killing of badger cubs by raccoon dogs; non-effective attacks of badger on raccoon dog at its sett as well as a lot of marking of badger setts by both species in order to prevent usage of the sett by the burrow-competitor species. Any attack of an active badger by raccoon dogs was not registered, and that was considered as something non-real.
Continue reading “Interference between the badger and raccoon dog in Belarus”
In one of our study area on the question, which is the Lovat terrain in Paazierre Forestin northern Belarus, both riparian vole species (the water vole Arvicola terrestris and root vole Microtus oeconomus) have become scarce since the American mink Neovison vison has established a dense population. Continue reading “Impact of American minks on water vole and root vole populations and populations of the aboriginal predators – eaters of these beneficial prey, in particular, the stoat and great grey owl”
Mating in Eurasian lynxes and other questions in relation to that (such as pre-mating activity; life of kits, when their mothers go for mating; others) are quite poor investigated (e.g. Schmidt et al., 1997; Schmidt, 1999; Jędrzejewski et al., 2002; Breitenmoser-Würsten et al., 2007; Samelius et al., 2012). The scarce information published on the question shows that these complicated mating-related actions in Eurasian lynxes are too simplified, while researchers mention about mating in lynxes. Let’s say there is evident gaps in the lynx-related literature on the species mating.
Continue reading “Mating in Eurasian lynxes”
Sometimes, it may be hard to differentiate tracks of the wolf and large domestic dog. Usually wolf footprints are bigger than those of dogs. Footprints left by wolves on a thin snow cover or loose ground are 8–13 cm long and 6–9 cm wide, whereas in the conditions of a loose snow cover these dimensions may be slightly higher. Prints of wolf digital pads are symmetric and oval, whereas in dogs they are frequently wider in rear part than in the front part. Male wolf has wider footprints than those of female wolf. Ratio between length and width comprises about 1.3 in footprints of male wolves, and approximately 1.5 in those of female wolves. In wolf footprints all digital pads look more massive than those of dogs in relation to the interdigital pad, even of large ones, and the two central digital pads in wolf footprints are mostly placed in front of the lateral digital pads. However, in a big male wolf the later feature is not pronounced, and this may be used for rough distinguishing of males and females among adult wolves by their fore footprints. The central digital pads are also placed tighter to each other in wolf footprints than those of stray dogs.
However, these observations are not totally reliable. Nowadays, some big dogs have big paws and rather massive digital pads like those of wolves. Continue reading “How to distinguish tracks of wolves and dogs”
Recently I faced with the next fourth case of scaring lynxes away from their kills by wolves and decided to prepare this post about this curious way of the species interference. This fourth registered such a story was outstandingly rich on events and relatively well photo-documented, therefore, I will begin just with that story.
In the story the main acting persons were Els Lavrysen and Hans Van Loy, a couple of lynx amateurs from Belgium, who faced the case of scaring lynx family away from the roe deer carcass by two wolves in Naliboki Forest (the central-western part of Belarus). Continue reading “Scaring lynxes away from their kills by wolves”
Together with Irina Rotenko we published a book about wolves in Belarus. There, we will address the questions of the species reproduction biology that are still insufficiently investigated and full of contradicting hypotheses and knowledge. However, the main thing for us in doing this book is that being interested in studying these hidden part of wolf life, we would like to share the knowledge and skills we have gained on wolves in Belarus with wolf colleagues and amateurs. Continue reading “Recently published book on the wolf reproduction biology”