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Bumble Bee Movement Ecology and Response to Wildfire with an Emphasis on Genetic Mark-recapture Techniques
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Bumble Bee Movement Ecology and Response to Wildfire with an Emphasis on Genetic Mark-recapture Techniques. |
| 개인저자 | Mola, John M. |
| 단체저자명 | University of California, Davis. Ecology. |
| 발행사항 | [S.l.]: University of California, Davis., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 142 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-06B. Dissertation Abstract International |
| ISBN | 9781392581162 |
| 학위논문주기 | Thesis (Ph.D.)--University of California, Davis, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-06, Section: B.
Advisor: Williams, Neal M. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | Bumble bees have long-served as model organisms of ecological research offering insight into the fields of behavioral ecology, animal movement, and pollination ecology. Recently reported declines in bumble bee populations have sparked intense interest in understanding their life history and response to changing landscapes. In this dissertation I focus on two areas of modern ecological interest: organismal movement and fire ecology, and examine them within the context of bumble bee biology. In chapter one, I review the tools available to researchers studying large-scale movements of bumble bees. In chapter two, I apply these tools to ask whether foraging range is potentially limited by natural barriers like forests or high elevations. In the final two chapters, I test how a natural disturbance in the form of wildfire affects bumble bee populations in terms of their floral resource availability, morphological changes, and population sizes as revealed from genetic mark-recapture. In my first chapter I sought to provide a one-stop-shop to the tools and methods available for the study of landscape-scale bumble bee movements. Because of bumble bees' cryptic nesting habits, high site-fidelity, and the difficulties of relocating marked insects over large distances, there have been a variety of direct and indirect ways researchers have attempted to estimate their movement patterns. I reviewed the advantages and limitations of various data sources including radar tracking, homing techniques, and genetic mark-recapture. I provide recommendations on appropriate techniques to use for different life stages and castes, emphasizing where recent methodological advances can help reveal key components of understudied parts of the bumble bee life cycle such as queen movement and dispersal.In chapter two, I examine the role of habitat fragmentation, resource availability, and species-specific differences in shaping the movement ecology of bumble bees. I used genetic mark-recapture to estimate the foraging distance, resource use, and population connectivity of two bumble bee species in a subalpine meadow complex. There was no evidence that forests function as barriers to fine-scale movement for either species. I found substantially larger foraging distances for Bombus vosnesenskii compared to B. bifarius. I commonly observed B. vosnesenskii foraging at distances exceeding 1 km among foraging patches separated by resource-poor conifer forest. The results suggest that bumble bee foraging patterns are explained by species-specific differences in movement capacity with little influence of previously suggested barriers like conifer forests. In chapters three and four, I took advantage of an unexpected opportunity to study wildfire. After the first year of field work, two wildfires burned through my study area subdividing it into burned and unburned patches. In chapter three I demonstrate how burning induces a prolonged flowering season, denser patches of blooms, and greater landscape-scale abundance of flowers available to bumble bee foragers. Importantly, the increased floral abundance in the burned areas did not come from a suite of fire-following plants unique to the burned sites, but instead was the result of an increased population of plants that were also present in the unburned areas. In chapter four I use genetic samples taken from bees before and after fire to show that the increased abundance of bumble bee foragers is not simply the result of a static population aggregating on concentrated floral resource abundance. Instead, genetic analyses reveal the presence of more bumble bee colonies following fire. Notably post-fire bees were also larger in body size and counts of queen bumble bees increased in the years following fire. Together these chapters represent new insights into bumble bee biology, movement ecology, and species response to disturbance. With technological advances in the tools available to researchers we can begin delving deeper into our understanding of cryptic parts of bumble bee ecology, like movement and response to disturbance. I hope this work stands as a worthwhile step towards that broader goal. |
| 일반주제명 | Ecology. Entomology. |
| 언어 | 영어 |
| 바로가기 | 
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