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1

Zur Verbreitung und Biologie des Marderhundes in der Oberlausitz.

100%
Ansorge H.
Przyroda Sudetów Zachodnich
|
1999
|
tom 02
99-104
2

Hair density in the Eurasian otter Lutra lutra and the Sea otter Enhydra lutris

51%
Kuhn R. A., Ansorge H., Godynicki S., Meyer W.
Acta Theriologica
|
2010
|
tom 55
|
nr 3
211-222
The hair density of adult Eurasian otters Lutra lutra (Linnaeus, 1758) and sea otters Enhydra lutris (Linnaeus, 1758) was analysed using skin samples taken from frozen carcasses. Lutra lutra exhibited a mean hair density of about 70 000 hairs/cm2 (whole body, appendages excepted), the mean individual density ranging from about 60 000 to 80 000 hairs/cm2. The dominant hair type were secondary hairs (wool hairs), the hair coat comprising only 1.26% of primary hairs (PH). Secondary hair (SH) density remained constant over the body (appendages excepted), whereas a few variations in PH density were observed. Neither an influence of the sex, nor a seasonal variation of the hair coat was found, moulting seems to be continuous. Enhydra lutris had a hair density between 120 000 and 140 000 hairs/cm2, the primary hairs representing less than 1% within the hair coat. Hair density remained quite constant over the regions of the trunk but was lower at the head (about 60 000 hairs/cm2 on the cheek). The hair follicles were arranged in specific groups with different bundles of varying size, normally comprising dominant numbers of wool hair (SH) follicles. Invariably there was always a large central primary hair follicle and numerous sebaceous glands between the bundles and principally around the PH follicles. The results are discussed related to possible ecological influences on hair coat density.
3

Differences in the microhabitat preferences of Neomys fodiens (Pennant 1771) and Neomys anomalus Cabrera, 1907 in Saxony, Germany

51%
Keckel M. R., Ansorge H., Stefen C.
Acta Theriologica
|
2014
|
tom 59
|
nr 4
The two semi-aquatic shrew species Neomys fodiens and Neomys anomalus are very similar in their ecology and morphology. Thus, they tend to be strong competitors for resources when they occur syntopically in habitats. We analysed the microhabitat selection of both species based on 14 parameters at two study sites in western Saxony (Germany). At the first study site, the results show segregation into different preferred microhabitats. In comparison to N. fodiens, N. anomalus occurred in low distance to the oxbow lake at places with denser herbal cover. Thus, we verified the hypothesis of Rychlik (Acta Theriologica 42:351-388 1997) who assumed differences in microhabitat niches for both shrew species to avoid competition. Furthermore, there was a spatial segregation within N. fodiens depending on their age. While adults occurred close to the water at areas with sparse herb layer, the juveniles and subadults were predominantly captured in some distance to the stream at denser vegetation. We assume that this is the result of different microhabitat preferences in N. fodiens depending on age and not a result of intraspecific antagonism. Moreover, the possibility to build subsurface burrows (and as an equivalent to this, crevice systems resulting of bank fixation with large stones) seems to be the main limiting factor for the occurrence of N. fodiens at the other surveyed site. At this site, no differences in microhabitats were visible between the age classes of N. fodiens.
4

Diet of the raccoon dog Nyctereutes procyonoides - a canid with an opportunistic foraging strategy

51%
Sutor A., Kauhala K., Ansorge H.
Acta Theriologica
|
2010
|
tom 55
|
nr 2
165-176
We examined the raccoon dog’s Nyctereutes procyonoides (Gray, 1834) diet in two agricultural landscapes of Germany and compared these results with other diet studies from its native and introduced ranges. The diet composition was influenced as well by the landscape structures as by the seasons: in the waterrich study area 2 amphibians (54.1%) and fish (10.8%) occurred more frequently in the samples. In study area 1 amphibians (19.0%) and invertebrates (69.4%) gained more significance in the diet in summer, whereas in winter samples maize (32.8%) was an important food item. The diet composition shifted according to the availability of different food items. Raccoon dogs, ability to feed temporarily on one food source may possibly cause a serious problem to endangered small populations of birds and amphibians. The review of 81 data sets from nine countries showed that seasons and locality affected the occurrence of most food items. However, comparable to the present study, small mammals, insects and plants were identified as important food items both in native and introduced ranges of the raccoon dog. In regard to its diet composition, gathering foraging strategy and inactivity during winter, the raccoon dog probably preys less often on game animals and birds than the native red fox Vulpes vulpes.
5

Feeding ecology of wolves Canis lupus returning to Germany

51%
Ansorge H., Kluth G., Hahne S.
Acta Theriologica
|
2006
|
tom 51
|
nr 1
99-106
Following several years of occasional occurrence, several wolvesCanis lupus Linnaeus, 1758 have established a resident population in northeastern Saxony (Eastern Germany). From 2001 to 2003, we collected and analysed 192 scats ofC. lupus. Results of our study are expressed as the frequency of occurrence of prey species and the percentage of biomass consumed using coefficients of digestibility as well as two variants of an equation for prey mass per collectable scat. Diet composition of the wolves was restricted to a few food items, mostly wild ungulates. These remains were found in 97% of the scats, representing 99% of the biomass consumed by the wolves. Roe deerCapreolus capreolus was the most frequent and most important prey, constituting nearly of one half the biomass. Red deerCervus elaphus was recorded in one-third of the samples, followed by wild boarSus scrofa, mouflonOvis am mon musimon and brown hareLepus europaeus. Compared with game occurrence, roe deer was clearly preferred over the other species. A difference between winter and summer diets was mainly due to the high occurrence of young wild boar in summer. The general diet pattern of the wolf in Saxony corresponds with that found in the naturally occurring populations in Europe.
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