Analysis of the influece of ungulates on the regeneration of Dinaric fir-beech forests in the research site Trnovec in the Kočevje forest managementregionKristjan Jarni
, Dušan Robič
, Andrej Bončina
Povzetek: In the period 1970-2000, 152 fenced-in areas were built in the Kočevje Forest Management Region with an aim to protect tree seedlings and saplings from ungulatesć activity and to monitor the influence of roe and red deer on natural regeneration. The average surface area of fenced areas is 0.71 ha. Using the pair comparison technique (fenced vs. unfenced areas), the structureand the composition of the natural regeneration of tree species as well as complete shrub and herb vegetation were analysed in the research site Trnovec. Furthermore, the vegetation was investigated using the Braun-Blanquetmethod. The research results show significant differences between fenced and unfenced areas, both in tree species composition and in theheight structure of the sapling community. In fenced areas the total numberof saplings taller than 50 cm is higher and an increase is also evident in the number of saplings of silver fir Abies alba, sycamore Acer pseudoplatanus, elm Ulmus glabra and other minor tree species. There are also significant differences in species composition and in the abundance of plant species in the herb layer. The results show that natural regeneration of Dinaric fir-beech forests is successful, provided the influence of ungulates is excluded.
Ključne besede: natural forest regeneration, Fagus sylvatica, roe deer, fir-beech forest, Abies alba, fenced area, seedling browsing, Kočevje forest region, research site Trnovec
DiRROS - Objavljeno: 12.07.2017; Ogledov: 1262; Prenosov: 292
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Factors affecting implantation failure in Roe DeerRoberta Chirichella
, Boštjan Pokorny
, Elisa Bottero
, Katarina Flajšman
, Luca Mattioli
, Marco Apollonio
Povzetek: Reproductive performance is one of the most important life%history traits that should be routinely studied and considered in adaptive wildlife management. In the case of roe deer (Capreolus capreolus), a species with delayed implantation, which complicates studies on fetuses, corpora lutea (CL) counting is the only alternative for routine monitoring. However, because of a possible implantation failure, the reliability of this method is questionable, and factors influencing implantation success have been poorly understood so far. We analyzed 2,594 intact uteri of roe deer hunted from 2006-2015 in an Apennine population, central Italy, during winter (mid-Jan to mid-Mar). By comparing the number of CL and fetuses in the same individuals (i.e., success in blastocyst implantation), we revealed a mean implantation failure of 8.6% in a pooled sample set (regardless of the age and origin of animals), with a high inter-annual variability. Contrary to adults, the implantation failure in yearlings was low. Implantation success was affected by individual maternal characteristics (positive effect of body mass and negative effect of age), climatic condition in summer (positive effect of July temperature up to 23.4°C, and negative effect above this threshold), winter harshness (negative effect of snow cover duration), and altitude (negative relation with the elevation). Reproductive performance of adult female roe deer cannot be adequately measured by CL counts because of high interannual variability in implantation failure and important effects of female attributes and environmental factors. However, for yearlings, which also express the highest variability in the ovulation rates, CL counts provide important information on their reproductive outcome because they have low implantation failure.
Ključne besede: Capreolus capreolus, central Italy, corpus luteum, fetus, implantation failure, litter size, reproductive performance, roe deer
DiRROS - Objavljeno: 20.02.2020; Ogledov: 173; Prenosov: 92
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