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1

An observation of aggressive physical interaction between free-ranging lynx

100%
Wolfl M., Wolfl S.
Acta Theriologica
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1996
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tom 41
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nr 4
During a study of Lynx lynx (Linnaeus, 1758) in the Jura Mountains of Switzer­land, we observed a fight between a radio-collared adult female and an unmarked lynx. The resident female attacked the other lynx and finally drove it away.
2

Maternal behaviour and juvenile dispersal in the Eurasian lynx

100%
Schmidt K.
Acta Theriologica
|
1998
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tom 43
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nr 4
Lynx Lynx lynx maternal behaviour and dispersal pattern were studied by radio -telemetry in the Białowieża Primeval Forest, E Poland from 1992-1995. From June­-July, 2 females with kittens used 1-4 dens per month, for 5 to 33 days each, Consecutively used dens were 1-3 km apart and were located in inaccessible places. Female movements were concentrated around the den at this time, Mothers left their kittens and returned to them, on average, 3 times per day. Mean time of female's absence from the den was 4 h 20 min. Mean den attendance averaged 4 hours. In August, kittens began to accompany their mother. At this time, each den was used for 2-3 days only and the distances between consecutive dens were 0.5—2 km. Dens were situated in places where a female killed large prey. In August, a female spent an average of 12 h 50 min with kittens, alternating with 4-h of absence. Subadults dispersed at 9-11 months of age, immediately after separation from their mothers. Four subadult males dispersed for 11, 39, 62 and 129 km from their natal ranges. Two subadult females dispersed for 5 and 9 km. Lynx that moved the farthest distances covered most of their routes during the first two months of dispersal, when they moved 20-32 km/month, compared to 3-11 km/month in the later period. Distant emigrations of two adult lynx (55 km by a male and 120 km by a female) were also recorded. Directions and routes of lynx dispersal and emigration were related to the contemporary distribution and availability of woodlands and forest corridors.
3

Caching prey in trees by Eurasian lynx

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Cerveny J., Okarma H.
Acta Theriologica
|
2002
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tom 47
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nr 4
Two cases of Eurasian lynx Lynx lynx (Linnaeus, 175S) caching prey (roe deer Capreolus capreolus) jn trees were documented: in southeastern Polami in February 1996 and in southwestern Czech Republic in November 19911. Both carcasses were
4

Large carnivores in the Carpathian Mountains: status and conservation problems

84%
Okarma H., Dovchanych Y., Findo S., Ionescu O., Koubek P., Szemethy L.
Nature Conservation
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2002
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tom 59
33-39
5

Feeding habits of the Eurasian lynx in the Swiss Jura Mountains determined by faecal analysis

84%
Weber J. M., Weissbrodt M.
Acta Theriologica
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1999
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tom 44
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nr 3
The feeding habits of the Eurasian lynx were investigated in the Swiss Jura Mountains. Fifty one food items were identified in 38 scats of which most were collected on lynx tracks. Wild ungulates - roe deer and chamois - contributed 47.1% of the overall diet, while hare and rodents represented 19.6% and 17.6% of the prey items.
6

Spatial organization and social relations in the Eurasian lynx population in Bialowieza Primeval Forest, Poland

84%
Schmidt K., Jedrzejewski W., Okarma H.
Acta Theriologica
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1997
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tom 42
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nr 3
The home range size, spacing pattern and intraspecific relations in the lynx Lynx lynx (Linnaeus, 1758) were studied in Białowieża Primeval Forest (eastern Poland), in 1991-19S6. Eighteen lynx (11 males and 7 females) were captured and radio­-collared. The mean autumn-winter home range size was 165 km2 for males and 94 km2 for females. In spring-summer, it was 143 and 55 km2, respectively. The mean life-time home ranges were 248 km" for males and 133 km* for females. Male home range size did not change significantly between autumn-winter and spring-summer seasons, however, their ranges increased by 40-90% just before and during the mating season (December-March). The home range of females in the autumn-winter season was almost twice as large compared with the spring-summer period (94 vs 55 km2). The smallest home ranges were observed in breeding females during the two months after parturition (10 kmJ) and these grew until the following spring. The home ranges calculated for 5-month periods shifted on average 4 km in adult males, 2.7 in adult females and 4.7 km in subadult males. One of the farthest shifts in the adult male range (8.7 km) was explained by the death of a neighbouring resident. The average overlap between adult males' ranges was 30%, while those between females was 6%. The largest overlap occurred between adult males and females (62%) as well as between adult and subadult males (75%). The lynx showed a tendency to avoid each other. The average distance between neighbouring adult males was 11.6 km, and they were never found closer than 1 km to each other. The average distance between neighbouring females was 8.1 km. Besides a few meetings between males and females (during and outside the mating season), they were located separately (4.4 km from each other, on average), in 93% of the cases an adult female was recorded with her dependent kittens. It was concluded that home range size and spacing pattern in male lynx depend on the distribution of females, whereas spacing in females was determined by food-related factors.
7

Space use by Eurasian lynxes Lynx lynx in Central Norway

84%
Sunde P., Kvam T., Moa P., Negard A., Overskaug K.
Acta Theriologica
|
2000
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tom 45
|
nr 4
Habitat and spatial organisation of 11 radio tagged Eurasiani lynxes Lynx lynx Linnaeus, 1758 were studied in a low-density (ca 0.3 ind/100 km ) population in a boreal-alpine environment with low and temporally varying densities {< 180 ind/100 km in winter) of ungulate prey, primarily roe deer and semi-domestic reindeer. The use of habitat measured as 4 biome categories ranked from south boreal to alpine influenced mountain vegetation did not vary seasonally, but lowlands were much preferred to alpine habitats. Adult males moved almost 3 times farther per day in linear distance (x = 5.9 km, n = 3) than did females with kittens ix = 2.0 km, n = 4) or subadult females (x = 2.5 km, n = 6; p = 0.002). Subadults (n = 5) dispersed 42 ± 13 (x ± SE) km during the first 9 months of independence, but often visited their natal range during the first year on their own. Adult lynxes roamed over very large annual ranges [males: 1906 ± 387 km (n = 4), females: 561 ± 102 km2 (n = 6)J that took > 5 days to pass through, independently of sex. The oniy male monitored over more than 1 year maintained 2 separate home ranges each year. The larger home ranges and the possible tendency towards less defined territory boundaries than previously reported for the species, may be caused by the lower prey and population densities, though culling of adult individuals may also have played a role by continuously creating empty gaps in the territorial mosaic.
8

Prey spectrum, prey preference and consumption rates of Eurasian lynx in the Swiss Jura Mountains

84%
Jobin A., Molinari P., Breitenmoser U.
Acta Theriologica
|
2000
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tom 45
|
nr 2
We examined 617 kills made by radio-tracked Eurasian lynx Lynx lynx (Linnaeus, 1758) from March 1988 to May 1998 to assess prey spectrum, preference, and food consumption rates in the Swiss Jura Mountains. Roe deer Capreolus capreolus and chamois Rupicapra rupicapra were the main prey (69 and 22%, respectively), followed by red fox Vulpes vulpes, brown hare Lepus europaeus, domestic cat Felis calus, wild cat Fclis sylvestris, marmot Marmota marmota, pine marten Martes marles, capercaillie Telrao urogallus, and badger Meles meles. Lynx fed on an ungulate prey from 1 to 7 days, depending on the prey category. The consumption rates of males, of females alone, and of females with kittens varied from 3.2 to 4.9 kg per night, with an increasing trend as the kittens grew older. Including the days when lynx had no kill (searching time) lynx consumed 2 ± 0.9 kg per night. The mean searching time was 1.5-2 days for females, depending on the season and the number of kittens, and 2.5 days for males. The mean interval between consecutive kills was 5.9 for males and 5.2 days for females, respectively. At 38% of carcasses the presence of one or several scavengers (red fox, raven Corvus corax or both) was detected, Although 69% of the kills were roe deer and only 22% chamois, we hypothesise that in the forests of the Jura Mountains chamois are more vulnerable to lynx predation than roe deer, as chamois had a slightly higher preference index (0.59) than roe deer (0.41), based on rough estimates of the two ungulate populations in the study area.
9

Diet patterns of Eurasian lynx Lynx lynx: what causes sexually determined prey size segregation?

84%
Sunde P., Kvam T.
Acta Theriologica
|
1997
|
tom 42
|
nr 2
The influence of sex, body weight, physical condition, age and season on diet choice was investigated by hunting reports and intestinal analyses of 441 lynx Lynx lynx (Linnaeus, 1758) from Norway killed during 1960-1996. Of self-provisioning (> 1 yr) lynx (n = 280), males preyed proportionately more upon cervids (primarily roe deer Capreolus capreolus and semi-domestic reindeer Rarigifer tarandus) compared to small game (mountain hare Lepus timidus and tetraonids) than females did. Only 5.4% of the variation in prey preference towards small game and cervids (p = 0.0002) could be explained by sex. In a logistic regression model, no additive effect of weight or any other parameters was found after sex had been included. We did not find sufficient evidence for body weight (sensil stricto) being related to prey choice, but propose that sexually determined prey segregation in lynx is caused by different ranging behaviour resulting in different encounter rates with different kinds of prey.
10

Observations on feeding order in a group of Eurasian lynx

84%
Literak I., Literakova M., Klimes J.
Acta Theriologica
|
2000
|
tom 45
|
nr 3
In December 1998, a group of three lynx Lynx lynx (Linnaeus, 1758), possibly a female with kittens was observed during two nights at a killed roe deer Capreolus capreolus in the Bukovske Vrchy hills, north-eastern Slovakia. There was an apparent feeding order among the lynx, with the largest eating first and the smallest last. Also, the "play-fight behaviour" was observed.
11

Patterns of variation in reproductive parameters in Eurasian lynx (Lynx lynx)

67%
Nilsen E. B., Linnell J. D. C., Odden J., Samelius G., Andren H.
Acta Theriologica
|
2012
|
tom 57
|
nr 3
Detailed knowledge of the variation in demographic rates is central for our ability to understand the evolution of life history strategies and population dynamics, and to plan for the conservation of endangered species. We studied variation in reproductive output of 61 radio-collared Eurasian lynx females in four Scandinavian study sites spanning a total of 223 lynx-years. Specifically, we examined how the breeding proportion and litter size varied among study areas and age classes (2-year-old vs. >2-year-old females). In general, the breeding proportion varied between age classes and study sites, whereas we did not detect such variation in litter size. The lack of differences in litter sizes among age classes is at odds with most findings in large mammals, and we argue that this is because the level of prenatal investment is relatively low in felids compared to their substantial levels of postnatal care.
12

Factors shaping the Eurasian lynx [Lynx lynx] population in the northeastern Poland

67%
Schmidt K.
Nature Conservation
|
2008
|
tom 65
3-15
13

Diet of Eurasian lynx Lynx lynx in the northern Dinaric Mountains (Slovenia and Croatia) Importance of edible dormouse Glis glis as alternative prey

67%
Krofel M., Huber D., Kos I.
Acta Theriologica
|
2011
|
tom 56
|
nr 4
The Eurasian lynx Lynx lynx (Linnaeus 1758) is an opportunistic predator that usually selects the smallest ungulate available. Its diet varies considerably among different regions; therefore it is important to study lynx diet in different parts of the species’ range. We studied the diet of lynx from the endangered Dinaric population in Slovenia and Croatia by analyzing lynx scats, prey remains, and stomach contents. Dinaric lynx mainly killed European roe deer Capreolus capreolus (0.64 frequency of occurrence, 79% of all consumed biomass), which were used more frequently during winter and spring. Ungulates were killed more often by adult males than by lynx of other age and sex groups. In contrast to studies from other regions, lynx in the northern Dinaric Mountains also frequently fed on the edible dormice Glis glis (0.18 frequency of occurrence, 7% of all consumed biomass). This large rodent appears to be an important alternative prey, especially for females and young lynx, and was the reason for the highest use of rodents reported so far for the Eurasian lynx. Edible dormice in Dinaric forests have highly variable numbers of active animals. Seasonal and possibly annual variation in dormouse availability obviously affects lynx diet. This is a rare example where variability in the availability of the alternative prey and not the preferred prey leads to the dietary shift. This study confirms the opportunistic nature of Eurasian lynx and the regional variability of its diet.
14

Behavioural and spatial adaptation of the Eurasian lynx to a decline in prey availability

67%
Schmidt K.
Acta Theriologica
|
2008
|
tom 53
|
nr 1
The distribution and abundance of food resources is a major factor influencing animal populations. I studied the effect of a roe and red deer population decline on diet composition, home range size and foraging pattern in the Eurasian lynxLynx lynx (Linnaeus, 1758) in the Białowieża Primeval Forest (BPF), eastern Poland. The population of cervids in BPF experienced a nearly two-fold reduction in size from 1991 through 2006 due to severe hunting pressure between 1991 and 1996. Comparison of published data on lynx diet during the high abundance of ungulates with new data obtained for the low abundance period showed that despite a significant decline in their availability, cervids (roe and red deer) continued to form the majority of the diet of lynx, with roe deer being most preferred in both periods. Home range sizes of lynx showed a tendency to increase with declining prey densities, as indicated by relative percentage increases in average yearly home range sizes amongst different sex/age groups. In response to lower availability of their main prey, lynx increased their daily straight-line movement distances by 44% and doubled the ranges covered in 5-day periods. This illustrated that, with declining prey abundance, the lynx increased their hunting efforts by either spending more time actively searching for prey or continuing foraging even after a successful hunt. Spatial analysis of the distribution of ungulates and lynx indicated that deer were evenly distributed throughout lynx ranges in BPF and spatial proximity of the predator to prey sites did not play an important role in the efficiency of hunting. Lynx may adapt to changing prey availability by increasing search effort, but this was not sufficient to prevent the negative influences of the prey decline on the lynx population. Prey depletion has an immediate effect on lynx spatial organization and, in consequence, on their density. This information has to be considered in prioritizing lynx conservation measures and management of ungulates.
15
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The first record of Aelurostrongylus abstrusus [Angistrongylidae: Nematoda] in Eurasian lynx [Lynx lynx L.] from Poland based on fecal analysis

67%
Szczesna J., Popiolek M., Schmidt K., Kowalczyk R.
Wiadomości Parazytologiczne
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2006
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tom 52
|
nr 4
Material. Thirty eight fecal samples of Eurasian Lynx (Lynx lynx L.) collected in Białowieża Primeval Forest (E Poland) in years 2001-2004 were analysed. Results. The presence of Aelurostrongylus abstrusus (L1) larvae was evidenced by use of decantation and flotation methods. The general prevalence of the infection recorded during the study was 21.1%, whereas mean intensity was 11,5 (1-33 larvae per sample). To our knowledge, this is the first case of Aelurostrongylus abstrusus recorded in Euroasian lynx from Poland.
16

Microhabitat selection by Eurasian lynx and its implications for species conservation

67%
Podgorski T., Schmidt K., Kowalczyk R., Gulczynska A.
Acta Theriologica
|
2008
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tom 53
|
nr 2
We studied microhabitat selection of the Eurasian lynxLynx lynx (Linnaeus, 1758) at 116 hunting and 88 resting sites in Białowieża Primeval Forest (Poland) to describe its characteristics and determine the importance of habitat structure for stalking prey and for security during resting. We identified lynx-used sites by radio-tracking 3 male and 3 female lynx. When hunting, the lynx did not select for any type or age class of forest. During both summer and winter, the lynx selected sites characterized by high complexity (number of structures useful for stalking: fallen logs and branches, root plates, patches of dense bushes) and low visibility. In summer, hunting sites were often located in the vicinity of small forest glades that provided good stalking opportunities for lynx and rich foraging resources for roe deer — the main prey of lynx. The habitat at kill sites was more open than at sites where the prey was cached, with higher visibility, lower density of trees and poorer undergrowth. The most important characteristic of resting sites was very low visibility that resulted mainly from using young pine or spruce thickets in the winter and dense undergrowth of oak-lime-hornbeam and ash-alder forests in the summer. The information provided by this study could have direct implications for Eurasian lynx conservation by guiding forest restructuring to better suit the species’ biological requirements.
17

Predation of Eurasian lynx on roe deer and red deer in Bialowieza Primeval Forest, Poland

67%
Okarma H., Jedrzejewski W., Schmidt K., Kowalczyk R., Jedrzejewska B.
Acta Theriologica
|
1997
|
tom 42
|
nr 2
Patterns of lynx Lynx lynx {Linnaeus, 1758) predation on ungulates were studied in the Polish part of Białowieża Primeval Forest (580 km ) from scats and prey remains of iynx between 1985-1996, and radiotracking of IS lynx between 1991-1996, Cervids were the main prey and constituted 90% of food biomass consumed (analysis of faeces) and 84% of prey killed. Roe deer Capreotus capreolus was positively selected by all lynx (though stronger by females and subadults than by adult males). Fawns and adult roe deer of both sexes were preyed on in proportion to their abundance in the population. Red deer Ceruus elaphus was taken less often than would have been expected at random, and fawns were positively selected by lynx. On average, lynx spent 76 h (3.2 days) feeding on a killed deer (from 38 h in a female with 3 kittens to 105 h in single adult females). Mean searching time (ie time from leaving the remains of one deer to killing another one) was 52 h (2.2 days); from 10 h in a female with 3 young to 104 h in subadults. Thus, the average kill rate by lynx was one deer per 5.4 days. Predation impact of lynx population on roe and red deer was estimated in 1991-1996, when recorded numbers were 288-492 roe deer and 359-607 red deer per 100 km" in late winter (March), and 501-820 roe deer and 514-858 red deer per 100 km" in spring (May/June). During that period densities of deer declined markedly due to deliberately elevated hunting harvest by forestry personnel, aimed at reduction of game damage to silviculture. Densities of adult lynx were little variable (2.4-3.2 inds/100 km2), but reproduction rate strongly varied in response to deer decline, from 0.67 juv/adult lynx in 1991/92 to 0.25 juv/adult lynx in 1995/96. Annually, lynx population killed 110-169 roe deer/100 km2, which constituted 21-36% of spring (seasonally highest) numbers of roe deer. Lynx predation was the most important factor of roe deer mortality. Furthermore, lynx population took 42-70 red deer/100 km2 annually, which constituted 6-13% of spring number of red deer. In red deer mortality, lynx predation played an inferior role to hunting harvest and wolf predation.
18

Data for estimating eaten prey masses from Eurasian lynx Lynx lynx scats in Central and East Europe

59%
Ruhe F., Burmester T., Ksinsik M.
Acta Theriologica
|
2007
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tom 52
|
nr 3
To derive a model which allows estimating eaten prey masses from lynxLynx lynx Linnaeus, 1758 scats, we fed 3 roe deerCapreolus capreolus, 2 wild boarsSus scrofa, 1 fallow deerDama dama, 1 mouflonOvis ammon musimon, 1 European hareLepus europaeus and 1 daily diet of miceMus musculus to two adult lynx. The percentage of prey use decreased with an increase in the offered body mass of the prey individual. Conversion factors from dry matter scat mass to fresh matter mass of eaten prey (y) increased linearly as the eaten mass of the prey individual (x) rose:y = 15.06 + 1.330x,R 2 = 0.643,F 1,7 = 12.6,p < 0.01. For estimating eaten prey masses from lynx scats we recommend to use (1) this equation as well as (2) prey type-specific conversion factors and (3) prey type-specific quotients of the eaten prey mass per scat.
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