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The European pine marten (Martes martes) is commonly classified as an opportunistic predator. If this is the case, the species ought to show seasonal differences in the small mammal composition of its scats – the types of prey taken depending on their abundanc. In addition, it ought to consume the food that requires lower energy cost for their acquisition in each season. The feeding strategy of the European pine marten was studied in northwestern Spain by analyzing 209 scats collected between July 2004 and June 2005, and by seasonally trapping small mammals to obtain information on their abundance. The study area (5,722 ha) was located in a mountainous region (1,707–880 m a.s.l.) and covered with brushwood and deciduous forest (oak, birch, holly and pine). Molecular analysis of scats (PCR-RFLP) was performed to rule out the presence of the stone marten (Martes foina L.). The frequency of occurrence and biomass of the small mammals (the main prey species) preyed upon each season were compared. The pine marten consumed significantly more small mammals in the seasons in which their abundance was the lowest (winter and spring). In the autumn, when the highest number of small mammals was detected, the pine marten did not increase its predation of them. These results indicate that the European pine marten is not an opportunistic predator. Rather, the feeding strategy adopted by the species seems to be intermediate between that of an opportunist and specialist predator.
Evaluating presence and habitat requirements of small carnivores is essential for their conservation. The Eurasian pine marten Martes martes, often described as a habitat specialist associated primarily with forest habitats, has been recently found to live even in patchily wooded country and in shrublands. We evaluated the environmental factors that determine the distribution of the pine marten in a Mediterranean landscape on the island of Sardinia (central Italy). Camera trapping sessions and scat surveys were carried out to assess the presence of the species, then a potential distribution model was developed using ecological niche factor analysis (ENFA), which requires only presence data. The pine marten selected highest altitudes, shrublands, rocky areas, and woodlands, and avoided urban areas and arable lands. Our results indicate that pine marten distribution in our study area is constrained by these variables. The ENFA analysis provided important clues about the distribution range of M. martes and its preferential environmental conditions, updating knowledge of its ecological requirements in Italy.
The seasonal diet of pine marten Martes martes (Linnaeus, 1758) in southern boreal Sweden was studied by analyses of scats and digestive tract contents collected over a 6-year period. The diet was diverse; whereas microtines was the single most important food category, also shrews, hares, birds, insects, and berries were frequently consumed. The diet of pine marten varied seasonally but the consumption of small mammals (microtines and shrews) and hares was relatively stable over the year, and may be regarded as a year-round staple for marten. The winter diet differed from most other Fennoscandian studies in that it contained more berries and insects, and less squirrels and cervids. This may be explained by the general lack of snow, and by the dense marten population, during the years of the study. Among birds passerines were most frequent; tetraonids were consumed mainly in winter. The food niche was broadest in winter and decreased over summer.
Two strategies of home range acquisition by male subadult pine martens (Martes martes) were described from a high-density population inhabiting Białowieża National Park. Four mother–offspring pairs were identified by genetic parentage assignments. Four subadult males showed two different strategies of home range acquisition: dispersal and sedentary. The dispersing males used an area 4–10 times larger than in sedentary subadult males. A sedentary subadult male used his natal area with his mother, and in the following mating season, this male left this area and established a home range that overlapped greatly with another unrelated female near the natal range. A similar high overlap between another subadult male and an unrelated adult female persisted for 3 years. After the death of this female, the male extended his range to overlap slightly with two to four other females. The sedentary strategy adopted by some subadult males may explain the great variation in spacing patterns of solitary mammals.
Marten species are usually surveyed by trapping, snow tracking or cameratrapping with baits on trees. While testing the efficiency of a monitoring scheme for wildcats Felis silvestris silvestris in north-western Switzerland, we noticed that martens are attracted by lure sticks scented with valerian. On these sticks, the animals leaved some hairs that allowed us to identify the genus Martes by microscopic analysis. Additionally, the animal can be identified on pictures made by a camera trap posed close to the lure stick. In this paper, we compared the efficiency of different methods to find the most appropriate one in order to survey the pine marten Martes martes (Linnaeus, 1758) in Switzerland. For the method of valerian lure sticks we estimated a detectability of 0.08 per 14 days during the whole year. The detectability raised, when we applied American Hawbaker’s marten lure instead of the valerian tincture. In addition, the detectability was higher during the period April to June (p=0.2) compared to the whole year. If we identified the pine marten on the lure stick with pictures from the camera traps we reached a detectability of 0.21 during the whole year. Using only camera traps with baits on trees we could not take any picture of a pine marten.
The present study analyses the helminth communities found in one hundred and two specimens of Martes martes from the Iberian Peninsula and the Balearic Archipelago. The component community is constituted by seventeen helminth species, which frequency and mean abundance show a bimodal pattern. The set of core species is constituted by the trichurids Pearsonema plica, Eucoleus aerophilus and Aonchotheca putorii (72.2% of total helminth individuals found), while the remaining can be considered satellite species. Significant co-occurrences were found among E. aerophilus/A. putorii and E. aerophilus/P. plica. These results demonstrate the great importance of earthworms within the diet of pine marten and contribute to the knowledge of the pine marten’s food ethology, since this kind of prey normally goes undetected in diet studies. Several helminth species, as Sobolevingylus petrowi, Centrorhynchus aluconis, Uncinaria criniformis, Mastophorus muris and Spirura rytipleurites seurati seem to show geographical distributions limited to insular ecosystems. Moreover, helminth communities of M. martes among four Spanish territories, including mainland and insular areas, are characterized and compared.
From 1991-1996, the activity rhythms of 14 radio-collared pine martens Martes martes (Linnaeus, 1758) (6 males and 8 females) were studied in the pristine deciduous and mixed forests of the Białowieża National Park. Tracking data (5823 h) indicated that the activity rhythms of pine martens varied between sexes and seasons. In spring, male activity peaked at 20.00-00.00 h, whereas in summer and autumn-winter, activity was bimodal, peaking at 18.00-22.00 h and 02.00-04.00 h. Female activity in spring was more evenly distributed than that of males, but in summer their activity peaked at 20.00-00.00 h, while in autumn-winter females had a bimodal rhythm with peaks at 18.00-20.00 h and 02.00-06.00 h. In breeding females, activity rhythms changed in the course of pregnancy and nursing. On average, martens started their activity 73±209 (SD) min before sunset and finished 87 ± 245 min after sunrise. Females became active earlier than males but both sexes terminated activity at the same time. For both males and females the daily activity rhythm was not related to the diurnal course of temperature.
The diet of the pine marten Martes martes (Linnaeus, 1758) was studied during 16 successive winters in an uninhabited area in northern boreal Finland. The results are based on 5677 scats analyzed. The present data support earlier findings that the pine marten is an opportunistic generalist, its most favoured food apparently being small rodents, especially Clethrionamys spp. The significant year-to-year variation in the frequency of occurrence of this favoured prey in the diet of the marten correlated positively with summer trapping numbers for these species. Snow cover decreased the martens' consumption of Microtus spp, but not Clethrionomys spp. or the wood lemming Myopus schisticolor. The first real alternative in the absence of small rodents appeared to be the red squirrel Sciurus vulgaris, and in its absence carcasses of reindeer Rangifer tarandus tarandus and eggs. Other food items included birds, the mountain hare Lepus tímidas, the common frog Rana temporaria, berries and mush­rooms. There was some evidence that the occurrence of red squirrels in the diet was dependent on the abundance of both squirrels and small rodents. We suggest that in northern boreal Finland martens primarily forage for small rodents, and larger prey, which is less available and more difficult to catch, is captured incidentally.
Sex-specific niche segregation is often used to explain sexual size dimorphism (SSD). However, whether food niche partitioning between sexes occurs as a case of sexual size dimorphism or by other mechanisms, such as behavioural dimorphism or habitat segregation, remains poorly understood. To evaluate the nature and extent of food-niche differentiation between sexes in a solitary predator I examined variation in the diet of male and female pine martensMartes martes Linnaeus, 1758 in years of high and low rodent abundance. Small mammals were the most important prey for pine martens in years of both low and high rodent abundance (occurring in more than 49% of scats). Birds, invertebrates and plant material were relatively common food items in summer diet, whereas ungulate carcasses were often consumed in autumn—winter. In general, males consumed more ungulate carcasses, plant material, amphibians and reptiles than did females, whereas females preyed more on squirrels and birds than males. There was significant seasonally dependent, between-sex variation in the occurrence of shrews, small rodents, other mammals, birds and invertebrates in marten diet. Whereas the occurrence of bank vole, birds, carcasses and plant material changed between sexes, seasons and years with various rodent abundances, both sexes consumed larger prey and had increased food niche breadth in years of low compared with high rodent abundance. Neither prey size nor food niche breadth were significantly different between males and females. The food-niche overlap between sexes was consistently lower in spring and in years of low rodent abundance. A wider geographical comparison of different marten populations showed that the diet of males and females varied significantly between locations. Females consistently preyed on squirrels and birds, whereas males fed more often on ungulate carcasses and plant material. Local and geographical comparison of male and female diets suggest that food-niche partitioning between male and female pine martens changes across different habitat and food conditions, and is not related to sexual size dimorphism, but rather to behavioural differences between sexes.
The aim of the study was to assess the diet composition of four carnivore species inhabiting the Gorce National Park (Western Carpathians, S Poland), i.e., grey wolf (Canis lupus), Eurasian lynx (Lynx lynx), red fox (Vulpes vulpes), and pine marten (Martes martes). The food analysis was based on scats collected between June 2016 and February 2017 along seven transects of a total length 96.13 km. Altogether 187 faeces were found, 95 of grey wolf, 20 of lynx, 49 of red fox, and 23 of pine marten, respectively. The dominant food category of wolf and lynx were ungulates, comprising respectively 98% and 95% of the consumed biomass. The trophic niche overlap between wolf and lynx was very high (Pianka’s index Ojk=0.99). However, there were differences in the consumed prey species. Wolves fed on red deer (Cervus elaphus), roe deer (Capreolus capreolus) and wild boar (Sus scrofa), while lynxes foraged equally on two ungulates, red deer and roe deer. Medium−sized carnivores showed greater variety in consumed food. Both pine marten and red fox had higher values of Levins’ index of the trophic niche breadth than larger carnivores and highly overlapped their diets (Ojk=0.96). Pine marten and red fox consumed mostly small mammals. Additionally, martens consumed frequently fruits, whereas red foxes foraged on carrion of ungulates. This might explain the fact that wolf and lynx overlapped their trophic niches more with red fox than with the pine marten.
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