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Iskalni niz: "ključne besede" (Cervus elaphus) .

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Red deer (Cervus elaphus) bark stripping on spruce with regard to spatial distribution of supplemental feeding places
Klemen Jerina, Mihec Dajčman, Miha Adamič, 2008

Povzetek: Forest damages caused by red deer and some other large herbivore species occasionally feeding on tree bark, are a grave ecological and economic problem in many parts of the world. Winter supplemental feeding is commonly used to mitigate the problem, but its effects are poorly known. This study, carried out at Pohorje (Slovenia) and including over 2,300 trees, used binary logistic regression to analyse the effects of supplemental feeding and many other factors on the probability of bark stripping on spruce. The probability of bark stripping depends on distance from the forest edge, density, age and tree species diversity of stands, slope and aspect of terrain, and red deer density; contrary to expectations, it is not related to distance from feeding places. As much as 35% of spruce trees were damaged. The damage was the highest in younger, denser pure spruce stands, whose favourable protective and microclimatic conditions (thinner snow cover, higher effective temperatures) make them a preferred winter habitat for red deer. They contain,however, little other food but bark. To prevent / diminish bark stripping we propose a stronger thinning of such stands. Supplemental feeding may reduce damage only in exceptional cases, when animals are lured and concentrated in less sensitive areas, but in general we advise against the use of this measure due to its other negative effects.
Ključne besede: red deer, Cervus elaphus, bark stripping, Norway spruce, Picea abies, forest damages, supplemental feeding, Slovenia, environmental factors
DiRROS - Objavljeno: 12.07.2017; Ogledov: 2647; Prenosov: 1003
.pdf Celotno besedilo (597,09 KB)

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Capital-income breeding in male ungulates : causes and consequences of strategy differences among species
Marco Apollonio, Enrico Merli, Roberta Chirichella, Boštjan Pokorny, Ajša Alagić, Katarina Flajšman, Philip A. Stephens, 2020

Povzetek: The capital and income breeding concept links energy resources used during reproduction to the timing of their acquisition. During reproduction, capital breeders rely on resources gained previously and accumulated for reproductive investment. By contrast, income breeders use mainly resources collected during the period of reproductive activity. Most commonly, this concept is applied to females; relatively few studies have considered males. Moreover, there has been little attention to the link between the capital-income divide and other aspects of mating strategy. We studied adult males of three wild ungulates with different levels of polygyny. A large dataset (4,264 red deer, 53,619 roe deer, and 13,537 Alpine chamois, respectively) was obtained during 2007-2017 in the whole territory of Slovenia and in the Trento province, Italy. During the rut, body mass loss of males in highly polygynous species was more than twice that of weakly polygynous species: on average, red deer stags lost 19.5%; chamois bucks 16.0%; and roe deer bucks 7.5% of their body mass. This indicates potential for a hitherto unrecognized link between the degree of intrasexual competition and the degree of capital mating. The variability in body mass at the end of the rut was clearly reduced in both highly polygynous species (from 15.1 to 9.4% in red deer, and from 12.5 to 10.5% in chamois), but did not change in roe deer. Finally, roe deer bucks had recovered body mass to that of the pre-rut period by just 2 months after the rut, while red deer stags did not manage to compensate the loss of weight until the end of the year. We suggest that, at least in ungulates, there is a link between the degree of polygyny and that of capital breeding. Males of capital and income breeders underwent body mass changes resulting from different reproductive investment during the rut. Capital breeders lost considerably more weight, and invested a variable amount of energy among individuals or among years, possibly to cope with different environmental or body conditions. In so doing, they ended the rut with poorer but more even condition among individuals.
Ključne besede: capital-income breeding, male reproductive investment, Capreolus capreolus, Cervus elaphus, Rupicapra rupicapra
DiRROS - Objavljeno: 23.09.2020; Ogledov: 765; Prenosov: 449
URL Celotno besedilo (0,00 KB)
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Vplivi okoljskih dejavnikov na prostorsko razporeditev jelenjadi v Poljanski dolini in Polhograjskih dolomitih
Blaž Černe, Miran Hafner, 2020

Povzetek: V Sloveniji navadni jelen (Cervus elaphus L.) še vedno širi svojo prisotnost na številna območja, med njimi tudi v Poljansko dolino in Polhograjske dolomite. V raziskavi smo proučili, kateri okoljski dejavniki ključno vplivajo na njegovo prostorsko razporeditev v gričevnatem in ponekod v sredogorskem proučevanem območju s povprečno gozdnatostjo 67 %. Raziskava temelji na vzorcu 585 georeferenciranih lokacij odvzema ter GIS-podatkovnih plasteh 34 okoljskih spremenljivk. Logistična regresija napoveduje, da se verjetnost za primernost prostora za habitat jelena v prvem modelu multivariatno povečuje z večanjem deleža gozdov, z manjšanjem razdalje do sosednjega območja, z večjim deležem dvoslojnih, raznomernih, prebiralnih gozdov ter grmišč in panjevcev, z večanjem deleža sestojev v obnovi ter zmanjšuje z manjšim deležem mladja. V drugem modelu smo odkrili tudi pozitiven vpliv deleža plodonosnega gozdnega drevja v lesni zalogi sestojev ter negativne vplive odsotnosti krmišč, večje razdalje do gozdnih cest in majhnih vrednosti sončnega obsevanja pozimi.
Ključne besede: navadni jelen, Cervus elaphus, habitat, Poljanska dolina, Polhograjski dolomiti, okoljski dejavniki, prostorska razporeditev, parkljarji, upravljanje z divjadjo, Slovenija
DiRROS - Objavljeno: 29.02.2020; Ogledov: 1503; Prenosov: 476
.pdf Celotno besedilo (275,67 KB)

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Metoda štetja kupčkov iztrebkov kot optimalen način ocenjevanja relativnih gostot jelenjadi na lokalni ravni
Urša Fležar, Klemen Jerina, 2020

Povzetek: Vedno boljše poznavanje pomena parkljarjev za ekosistem in človeka ter hkrati širjenje teh živalskih vrst v evropskem prostoru prinaša potrebo po nadgrajevanju in izpopolnjevanju načinov njihovega upravljanja. V Sloveniji se je v zadnjih letih zaradi stopnjevanja konfliktov interesov gozdarske, lovske in kmetijske stroke pojavila potreba po natančnejšem poznavanju številčnosti domorodnih vrst parkljarjev, še posebno jelenjadi (Cervus elaphus). V tem prispevku smo opredelili metodo štetja kupčkov iztrebkov s predhodnim čiščenjem kot najbolj optimalno metodo za ugotavljanje lokalnih gostot jelenjadi in podrobno razložili metodološke korake za uspešno načrtovanje in izvedbo metode na terenu. Zaključili smo s primerom izvedbe metode v LPN Kompas Peskovci in predstavili rezultate gostot jelenjadi in srnjadi (Capreolus capreolus) na omenjenem območju, pridobljenimi z metodo štetja kupčkov iztrebkov.
Ključne besede: prostoživeči parkljarji, jelenjad, Cervus elaphus, srnjad, Capreolus capreolus, štetje kupčkov iztrebkov, upravljanje prostoživečih živali, monitoring, LPN Kompas Peskovc
DiRROS - Objavljeno: 14.12.2020; Ogledov: 832; Prenosov: 289
.pdf Celotno besedilo (320,21 KB)

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