Factors affecting timing of seasonal migration by roe deer (Capreolus capreolus)
Roe deer (Capreolus capreolus) live in diverse environmental conditions due to their wide distribution. Because of their high variety of living conditions it is common that some individuals in a population have different summer and winter areas. These areas are generally the same over the years and...
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| Formato: | H1 |
| Lenguaje: | Inglés sueco |
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SLU/Dept. of Ecology
2018
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| Materias: |
| _version_ | 1855572289485012992 |
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| author | Höglund, Linda |
| author_browse | Höglund, Linda |
| author_facet | Höglund, Linda |
| author_sort | Höglund, Linda |
| collection | Epsilon Archive for Student Projects |
| description | Roe deer (Capreolus capreolus) live in diverse environmental conditions due to their wide distribution. Because of their high variety of living conditions it is common that some individuals in a population have different summer and winter areas. These areas are generally the same over the years and the migrations between these areas occur in spring and fall. The timing and distance of these seasonal migrations was the main focus of my study. Timing of migration can be affected by various factors and by studying the impact of age, sex, seasonal phenology (determined by the Normalized Difference Vegetation Index, NDVI), winter severity, temperature, and migration distance this study investigated the relative importance of these factors in affecting timing of seasonal migration. This study showed that age and seasonal phenology were the main factors affecting the timing of seasonal migration in spring with earlier departure in early springs and by older animals. Furthermore, shorter distance between seasonal areas resulted in a greater variation in the timing of seasonal migration, both between individuals but also within the same individual for animals that were followed during several years. Age and seasonal phenology were the main factors affecting timing of seasonal migration also in the fall. However, in addition sex was also affecting the timing of migration in fall. Overall, variation in the timing of seasonal migration was greater in fall than in spring and male roe deer stayed at the summer ranges longer than females. Females, especially those who migrated >10 km, returned to winter areas earlier than short-distance migrants. |
| format | H1 |
| id | RepoSLU13704 |
| institution | Swedish University of Agricultural Sciences |
| language | Inglés swe |
| publishDate | 2018 |
| publishDateSort | 2018 |
| publisher | SLU/Dept. of Ecology |
| publisherStr | SLU/Dept. of Ecology |
| record_format | eprints |
| spelling | RepoSLU137042020-05-20T10:53:35Z Factors affecting timing of seasonal migration by roe deer (Capreolus capreolus) Faktorer som påverkar säsongsvandringens tajming hos rådjur (Capreolus capreolus) Höglund, Linda roe deer Capreolus capreolus seasonal migration home range NDVI Roe deer (Capreolus capreolus) live in diverse environmental conditions due to their wide distribution. Because of their high variety of living conditions it is common that some individuals in a population have different summer and winter areas. These areas are generally the same over the years and the migrations between these areas occur in spring and fall. The timing and distance of these seasonal migrations was the main focus of my study. Timing of migration can be affected by various factors and by studying the impact of age, sex, seasonal phenology (determined by the Normalized Difference Vegetation Index, NDVI), winter severity, temperature, and migration distance this study investigated the relative importance of these factors in affecting timing of seasonal migration. This study showed that age and seasonal phenology were the main factors affecting the timing of seasonal migration in spring with earlier departure in early springs and by older animals. Furthermore, shorter distance between seasonal areas resulted in a greater variation in the timing of seasonal migration, both between individuals but also within the same individual for animals that were followed during several years. Age and seasonal phenology were the main factors affecting timing of seasonal migration also in the fall. However, in addition sex was also affecting the timing of migration in fall. Overall, variation in the timing of seasonal migration was greater in fall than in spring and male roe deer stayed at the summer ranges longer than females. Females, especially those who migrated >10 km, returned to winter areas earlier than short-distance migrants. Rådjur (Capreolus capreolus) har på grund av sitt stora utbredningsområde, väldigt olika miljömässiga förutsättningar. Det är inte ovanligt att vissa individer utvecklat en strategi där de utnyttjar olika områden beroende på om det är sommar eller vinter. Dessa förblir ofta desamma över tid och säsongsvandringarna sker under vår respektive höst. Tidpunkten för dessa säsongsvandringar är vad jag i huvudsakligen har fokuserat på i den här studien. Tajmingen av dessa säsongsvandringar påverkas av många faktorer och genom att studera påverkan av ålder, kön, växtfenologi (bedöms med NDVI värde), vinter, temperatur och vandringsdistans undersöktes olika faktorers relativa påverkan på tajmingen av säsongsvandringarna. Denna studie visar att det på våren var ålder och växtfenologi som hade störst påverkan på tidpunkten för säsongsvandringar på Grimsö forskningsområde med tidigare säsongsvandringar under tidiga vårar och hos äldre djur. Kortare säsongsvandringar resulterade i en mer spridd tidpunkt för tajmingen av säsongsvandringarna, både mellan individer men också för de enskilda individerna som följdes under flera år. Under hösten var det också framförallt ålder och växtfenologi som påverkade tajmingen av säsongsvandringarna, men här hade även kön en stor betydelse för tajmingen av säsongsvandringarna. Generellt så hade rådjuren en större spridning av tidpunkten för säsongsvandring på hösten än på våren med framförallt bockarna som stannade längre på sommarområdet än getterna. Getterna, särskilt de som vandrade längre än 10 km, återvände till vinterområdet tidigare än kortvandrarna. SLU/Dept. of Ecology 2018 H1 eng swe https://stud.epsilon.slu.se/13704/ |
| spellingShingle | roe deer Capreolus capreolus seasonal migration home range NDVI Höglund, Linda Factors affecting timing of seasonal migration by roe deer (Capreolus capreolus) |
| title | Factors affecting timing of seasonal migration by roe deer (Capreolus capreolus) |
| title_full | Factors affecting timing of seasonal migration by roe deer (Capreolus capreolus) |
| title_fullStr | Factors affecting timing of seasonal migration by roe deer (Capreolus capreolus) |
| title_full_unstemmed | Factors affecting timing of seasonal migration by roe deer (Capreolus capreolus) |
| title_short | Factors affecting timing of seasonal migration by roe deer (Capreolus capreolus) |
| title_sort | factors affecting timing of seasonal migration by roe deer (capreolus capreolus) |
| topic | roe deer Capreolus capreolus seasonal migration home range NDVI |