Importance of winter rape for small rodents (original) (raw)
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Mammalian Biology - Zeitschrift für Säugetierkunde, 2011
Substantial changes in the composition of crops in Central Europe during the last two decades (increasing areas of maize, rape and sunflower fields) have significantly influenced the structure and dynamics of animal communities, though there is a lack of data available for small rodents. In this study, we assessed the importance of these three crops for rodents and compared it with traditional crops (alfalfa, barley, wheat). We observed that herbivorous species (especially the common vole) do not live in crops which do not have green leaves near the ground (e.g. sunflower, maize), while mobile granivorous species can inhabit all types of crop. We confirmed the presumed differences in habitat preferences; however we rejected the hypothesis of a general increase of rodent abundance during the vegetative season in managed fields. We found that (1) maize and sunflower had no importance for common voles, but they were favored habitats for wood mice; (2) numbers of wood mice in rape decreased during the season, while abundances of common voles increased; (3) common vole populations tended to increase during the season in all suitable crops (alfalfa, barley, wheat, tendency in maize and rape); (4) wood mice populations seemed stable in all crops; i.e. without a seasonal increase. It can be concluded that even if the new crop fields are an important part of the agricultural landscape, they are only a temporal habitat for small mammals, especially granivorous species.
Winter activity rhythms of a rodent pest species in agricultural habitats
Mammal Research, 2019
Predation risk is the main factor affecting movements of mammal prey species. Here we assessed the activity patterns of a nearly endemic fossorial rodent, the Savi's pine vole Microtus savii, in two agroecosystems in central Italy. Direct captures were carried out in cold months (December-March) with live-traps; sex and age were recorded for each captured individual following standard methods. Savi's pine voles were mostly active during daytime in both study sites, with no differences between sexes or age classes. Night-time movements were mainly registered during waning moon nights and were severely restricted in bright moonlight. The activity pattern of Savi's pine voles seems to support the hypothesis of predation avoidance. The most common predators of these small rodents are mainly active during bright nights, when visibility is highest, forcing voles to be more active aboveground during daylight hours as well as in the darkest nights. Efficient monitoring and trapping programmes should therefore take place in daylight hours to increase capture success and to reduce stress levels of the captured animals.
Harvesting behaviour of three central European rodents: Identifying the rodent pest in cereals
Crop Protection, 2011
In central Europe, rodent damage in cereal crops is usually attributed to the common vole but these are caused by other rodents such as Apodemus mice as well. This raises a practical problem of identifying the rodent pests causing the damage to cereals at the time of harvest. To facilitate field differentiation between the damage caused by voles or mice, we conducted laboratory experiments in which the common vole, wood mouse and pygmy field mouse were presented with standing culms of wheat. Harvesting behaviour in these rodents differed strikingly. Wood mice first climbed and then cut down the culm at a height of about 20 cm. Pygmy field mice climbed to the top of the culm, harvesting only the ear. Voles cut the culm close to the ground leaving the stubble of about 8 cm in height. Our observations provide a quick and simple clue for identifying a causal rodent species in cereals and help in adopting a proper strategy for population management of a pest rodent.
Journal of Zoology, 2002
In southern Norway, population¯uctuations of the herbivorous bank vole Clethrionomys glareolus and the granivorous wood mouse Apodemus sylvaticus were analysed in relation to mast seeding of bilberry Vaccinium myrtillus, sessile oak Quercus petraea and Norway spruce Picea abies. Bilberries ripen in August, acorns are dispersed in September, whereas spruce seeds are usually dispersed during winter or spring. The bilberry index of both the current and previous year contributed signi®cantly to explain the population growth indices of bank vole. The spruce seed index signi®cantly in¯uenced only the bank vole, whereas the acorn index signi®cantly in¯uenced only the wood mouse, apparently through increased winter survival. Because of the lack of signi®cant responses to bilberry masting by granivorous wood mice, we conclude that the most likely explanation for the observed peak populations of bank voles in post-mast years of bilberry is that high seed crops have a positive in¯uence on the chemical composition of bilberry plants, which are important as food for bank voles during winter.
An Ecological Study on Rodents of Natural Vegetation
2016
ABSTRACT: An ecological study on species composition, distribution, relative abundance and habitat association of rodents was conducted in Siltie natural vegetation and nearby farmlands during July 2008- March 2009. Five habitat types, three from natural and two from agricultural fields were randomly selected based on representation of the main vegetation zones. In each habitat type, one representative grid was selected for live trapping. In addition, rodents were also snap-trapped from these habitats. A total of 562 captures was made in 2940 live-trap nights and 87 in 1200 snap-trap nights. Species of small mammals trapped were Mastomys natalensis (33.3%), Arvicanthis dembeensis (23.0%), Mastomys erythroleucus (12.1%), Stenocephalemys albipes (8.4%), Desmomys harringtoni (6.0%), Mus mahomet (5.9%), Tatera robusta (5.1%), Lophuromys flavopunctatus (2.8%), Rattus rattus (2.5%) and Arvicanthis niloticus (0.9%). The trap success varied significantly from habitat to habitat. Population...
Mammal Research
Animals that feed on forest tree seeds, such as Apodemus mice, increase in number after a mast year. At high latitudes, there is a similar delayed response by Myodes voles to high seed crops of bilberry (Vaccinium myrtillus), but here the mechanism is hypothesised to be increased forage quality, caused by a trade-off between reproduction and defence in the plants. Both Apodemus mice and Myodes voles eat berries, but only the latter feed on bilberry plants. Hence, only Myodes voles are predicted to respond to bilberry peak years. A second prediction is that the effect should last longer than any possible direct impacts of bilberries, because the plants would not be able to rebuild their defence until the succeeding summer. During a 21-year snap-trapping study of small rodents in Southern Norway, the spring population of bank vole (Myodes glareolus) was positively related to a bilberry seed index of the previous year, indicating increased winter survival, whereas the wood mouse (Apode...
Patterns of macro and microhabitat use of two rodent species in relation to agricultural practices
Ecological Research, 2010
Habitat selection may reflect the location of the home ranges or the allocation of shelter and foraging sites within a given habitat. We studied seasonal patterns of habitat use by Akodon azarae and Calomys laucha at two spatial scales: between maize fields and their weedy edges (macrohabitats), and associations of rodents captures with vegetation variables at the trap site level (microhabitats). We evaluated if the different habitat uses were related to disturbances generated by practices associated to maize cycle. A. azarae used mainly field edges, but it showed an increased use of maize fields when the crop reached maturity in summer. Contrarily, C. laucha used maize fields in a higher proportion than edges in all seasons. C. laucha was more influenced by microhabitat characteristics than A. azarae. C. laucha was present in sites with abundant dicot weeds when maize was growing up, while it was associated to sites with weeds with scarce cover in stubble maize fields. Before harvesting, both species were segregated at the microscale within maize fields. A. azarae was related to sites with high availability of green plant cover and C. laucha occupied low-quality sites, probably attributed to differences in their diets. We conclude that the pattern of habitat use by both species is best predicted at the macrohabitat scale, and when they are impoverished and present internal heterogeneity, there is selection at microhabitat scale of those better sites. While A. azarae responds to changes in vegetation cover and habitat structure associated to agricultural practices, C. laucha uses cropfields in an opportunistic way, affected by interspecific competition.
Spatial distribution of voles and mice and their abundances in agricultural landscape are largely influenced by their food preferences and the distribution of preferred crops. Here we examined the correspondence between food preferences of dominant rodent species (two mice and one vole) for two cereals (wheat and barley) estimated in the lab and the long-term field abundances observed at the harvest time in southern Moravia, Czech Republic. In the first laboratory trial, harvested culms of wheat and barley were offered. The pygmy field mouse preferred (100%) the seed head of wheat, also the wood mouse (87%) and common vole (60%) showed low preference for wheat. In the second trial, we observed similar preferences in consuming the offered grains of both cereals, the wheat being preferred by the pygmy field mouse, and the wood mouse, while with the common vole showing no preference. Laboratory analysis of the harvested grains indicated a lower fibre content in wheat compared with barley. In the field, rodent abundances in wheat were higher than those in barley, especially in mice. This suggests that food preferences in the laboratory correspond closely to field distribution of these rodents and their abundances. Therefore, studying diet preferences may be of essential in predicting small rodent abundances in changing agricultural landscape. #
Habitat use and abundance of deer mice: interactions with meadow voles and red-backed voles
Canadian Journal of Zoology 63:1870-1879, 1985
Deer mice (Peromyscus maniculatus) are remarkably flexible in their habitat distribution, ranging from mature coniferous forests to grasslands. Red-backed voles (Clethrionomys rutilus) live in a variety of forest and shrubland habitats, frequently coexisting with deer mice. In contrast to the two previous species, meadow voles (Microtus pennsylvanicus)
Surveillance Strategies of Rodents in Agroecosystems, Forestry and Urban Environments
Sustainability
Rodents belong to the group of occasionally economically significant to very significant pests. Some species, especially synanthropic species, cause material damage in various ways. Successful and sustainable management of rodent control strategies requires different procedures such as prevention and rodent control measures. The present study gives an overview of the most common rodent species and methods for estimating the rodent population to assess the risk of economic damage that may occur due to rodents feeding in field crops, gardens, orchards, and young forest plantations, as well as contamination of stored food. As a prerequisite for effective integrated control of mice and voles, it is necessary to implement an adequate long-term monitoring system of these species, as they are primary pests. The integrated approach improves the treatment efficacy and reduces the treatment costs but also is considered ecologically friendlier compared to conventional measures. An integrated a...