Divisjon for skog og utmark
Hjortmerk
Slutt: des 2030
Start: jan 2007
Informasjon om merkeprosjekt på hjort, både pågående og avslutta prosjekt
| Status | Pågående |
| Eksternt prosjektnettsted | Facebook - Hjort og hjortemerking |
| Start- og sluttdato | 01.01.2007 - 31.12.2030 |
| Prosjektleder | Erling Meisingset |
| Divisjon | Divisjon for skog og utmark |
| Avdeling | Vilt og utmarksressurser |
Publikasjoner i prosjektet
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Erling Meisingset Joar Gusevik Atle Skjørestad Øystein Brekkum Atle Mysterud Frank Narve RosellSammendrag
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Atle Mysterud Isa Nergård Skjelbostad Inger Maren Rivrud Øystein Brekkum Erling MeisingsetSammendrag
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Erling MeisingsetSammendrag
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Leif Egil Loe Inger Maren Rivrud Erling Meisingset Silje Bøe Martine Hamnes Vebjørn Veiberg Atle MysterudSammendrag
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Erling MeisingsetSammendrag
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Erling MeisingsetSammendrag
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Lars Qviller Nina Risnes Olsen Kim Magnus Bærum Erling Meisingset Leif Egil Loe Bjørnar Ytrehus Hildegunn Viljugrein Atle MysterudSammendrag
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Forfattere
James David Mervyn Speed Erling Meisingset Gunnar Austrheim Alison J. Hester Atle Mysterud Jean-Pierre Tremblay Erling Johan SolbergSammendrag
Browsing by cervids plays a key role in structuring forest ecosystems and dynamics. Many boreal forest systems are managed for timber resources, and at the same time the wild cervid populations are also harvested. Thus, the determination of sustainable densities of cervids for the purpose of forest and game management is challenging. In this study we report on a red deer (Cervus elaphus) exclosure experiment in the mature forests of Western Norway. Ten pairs of exclosures and browsed plots were initiated in 2008. The rate of browsing and height growth of marked individuals was recorded annually, and the total densities of all tree species assessed over the following 4 y. We found that height growth of rowan (Sorbus aucuparia) saplings (1 m tall), the most numerous tree species at the site, was prevented when 20% of the shoots were browsed. Outside of the exclosures, net height growth of rowan saplings tended to be positive when trees were below 40 cm in height, but growth was constrained in rowan saplings over this height. The density of rowan also increased in both treatments, showing that recruitment was occurring, but the increase was greater where browsed than in the exclosure. The increase in density of rowan, combined with the curtailment of height growth in the presence of red deer, serves to create a carpet of short stature rowan saplings. This has parallels with the browsing lawn concept, but it seems to occur in interaction with snow depth; individuals protruding above the snow layer are likely to be browsed during the winter, whilst smaller individuals are protected during this season, when browsing is at its peak. Keywords: browsing lawns, Cervidae, Cervus elaphus, herbivory, snow depth, sustainable management. Résumé : Le broutement par les cervidés joue un rôle clé dans la composition, la structure et la dynamique des écosystèmes forestiers. De nombreux systèmes forestiers boréaux sont gérés à la fois pour la production de ressources ligneuses et la chasse sportive des cervidés. Un enjeu majeur réside dans la détermination d’une densité de cervidés permettant une exploitation durable de ces ressources. Dans cette étude, nous rapportons une expérience d’exclusion du cerf élaphe (Cervus elaphus) dans les forêts matures de l’ouest de la Norvège basée sur 10 paires d’exclos et de parcelles accessibles au broutement établies en 2008. Nous avons mesuré annuellement durant 4 ans le taux de broutement et de croissance verticale de semis et de gaulis marqués et estimé les densités totales de toutes les espèces d'arbres. Hors des exclos, la croissance des gaules (1 m de haut) de sorbier des oiseleurs (Sorbus aucuparia), l’espèce ligneuse la plus abondante sur le site, était compromise lorsque 20 % des pousses étaient broutées. Nous avons observé une tendance positive dans la croissance des gaules de moins de 40 cm alors qu’elle était compromise au-delà de ce seuil. La densité de sorbiers a également augmenté à l’intérieur et à l’extérieur des exclos révélant un recrutement positif, toutefois l'augmentation de la densité était plus marquée dans les parcelles soumises au broutement. L'augmentation de la densité de sorbiers, combinée à la réduction de la croissance en hauteur, en présence du cerf élaphe génère une strate dense de sorbiers de petite stature. Cette situation présente des similitudes avec le concept de haie de pâturage (browsing lawn), mais pourrait être liée à l’épaisseur de neige au sol. En effet, les arbustes qui dépassent la couche nivale sont plus susceptibles d’être broutés que les plus petits qui sont protégés en hiver lorsque la consommation d’espèces ligneuses est maximale. Mots-clés : cervidés, Cervus elaphus, épaisseur de neige, exploitation durable, haie de pâturage, herbivorie
Forfattere
Erling Meisingset Øystein Brekkum Leif Egil Loe Arve Aarhus Unni Støbet Lande Inger Maren Rivrud Atle MysterudSammendrag
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Erling MeisingsetSammendrag
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Anders Skonhoft Vebjørn Veiberg Asle Årthun Gauteplass Jon Olaf Olaussen Erling Meisingset Atle MysterudSammendrag
This paper presents a bioeconomic analysis of a red deer population within a Norwegian institutional context. This population is managed by a well-defined manager, typically consisting of many landowners operating in a cooperative manner, with the goal of maximizing the present-value hunting related income while taking browsing and grazing damages into account. The red deer population is structured in five categories of animals (calves, female and male yearlings, adult females and adult males). It is shown that differences in the per-animal meat values and survival rates (‘biological discounted’ values) are instrumental in determining the optimal harvest composition. Fertility plays no direct role. It is argued that this is a general result working in stage-structured models with harvest values. In the numerical illustration it is shown that the optimal harvest pattern stays quite stable under various parameter changes. It is revealed which parameters and harvest restrictions that is most important. We also show that the current harvest pattern involves too much yearling harvest compared with the economically efficient level.
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Atle Mysterud Leif Egil Loe Erling Meisingset Barbara Zimmermann Arne William Hjeltnes Vebjørn Veiberg Inger Maren Rivrud Anders Skonhoft Jon Olaf Olaussen Oddgeir Andersen Richard Bischof Christophe Bonenfant Øystein Brekkum Rolf Langvatn Hallvard Flatjord Ivar Syrstad Arve Aarhus Vidar HoltheSammendrag
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Atle Mysterud Leif Egil Loe Barbara Zimmermann Richard Bischof Vebjørn Veiberg Erling MeisingsetSammendrag
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Atle Mysterud Erling Meisingset Vebjørn Veiberg Rolf Langvatn Erling Johan Solberg Leif Egil Loe Nils Christian StensethSammendrag
Proper management of wildlife relies on metrics of population development. Typically, the best estimation techniques are too expensive for coarse-scale management. In marine fisheries, catch-per-unit effort is commonly used, but problems may arise due to changes in spatial harvest effort or in habitat use as density changes. Managers in Norway are in the early phases of implementing "seen deer" during harvesting and "spring counts" on farmland as a means of monitoring red deer Cervus elaphus populations. We provide a first evaluation of how suitable these methods are by comparing the results with population estimates obtained using cohort analysis, and by analysing the within-season variation in number of seen deer. "Seen deer" predicted annual increases in populations fairly well. Adjusting for harvesting effort provided less good estimates, due to a proportionally larger increase in effort relative to deer population size as population size increased. The number of seen deer per day decreased rapidly at the beginning of the season, and then levelled off or increased slightly during the rut, especially on farmland. The number of seen deer increased both with the number of harvesters and hours harvested, but at a diminishing rate. The current practice of "spring counts" was not successful in predicting population changes, probably due to a lack of replication. Indeed, date strongly affected the number of deer seen during spring counts. While "seen deer" seems to be a very promising tool for monitoring population size of red deer, there are some limitations to the practice as implemented for moose Alces alces in Scandinavia due to a more complex relationship with harvesting effort. Our study highlights that the large number of hours harvesters observe wildlife can provide a useful tool for population monitoring. However, the use of such indices may vary between species and according to harvest techniques and should thus be assessed with care before implementation
Forfattere
Claudia Melis Astrid Buset Per Arild Aarrestad Oddvar Hanssen Erling Meisingset Reidar Andersen Arne Moksnes Eivin RøskaftSammendrag
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