7 results on '"Bohrer, Gil"'
Search Results
2. Optimizing Wind Power Generation while Minimizing Wildlife Impacts in an Urban Area
- Author
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Bohrer, Gil, primary, Zhu, Kunpeng, additional, Jones, Robert L., additional, and Curtis, Peter S., additional
- Published
- 2013
- Full Text
- View/download PDF
3. Intergenic and Genic Sequence Lengths Have Opposite Relationships with Respect to Gene Expression
- Author
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Colinas, Juliette, primary, Schmidler, Scott C., additional, Bohrer, Gil, additional, Iordanov, Borislav, additional, and Benfey, Philip N., additional
- Published
- 2008
- Full Text
- View/download PDF
4. Advances in Linking Wintering Migrant Birds to Their Breeding-Ground Origins Using Combined Analyses of Genetic and Stable Isotope Markers.
- Author
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Chabot, Amy A., Hobson, Keith A., Van Wilgenburg, Steven L., McQuat, Gregory J., Lougheed, Stephen C., and Bohrer, Gil
- Subjects
BIRD conservation ,BIRD ecology ,MIGRATORY animals ,BIRD populations ,DEMOGRAPHY ,MANAGEMENT - Abstract
An enduring problem in avian ecology and conservation is linking breeding and wintering grounds of migratory species. As migratory species and populations vary in the degree to which individuals from distinct breeding locales mix on stop-over sites and wintering grounds, establishing migratory connectivity informs our understanding of population demography and species management. We present a new Bayesian approach for inferring breeding grounds of wintering birds of unknown origins in North America. We incorporate prior information from analysis of genetic markers into geographic origin assignment based upon stable- hydrogen isotope analysis of feathers (δH
f ), using the Loggerhead Shrike (Lanius ludovicianus). Likely geographic origins derived from analyses of DNA microsatellites were used as priors for Bayesian analyses in which birds were assigned to a breeding-ground origin using their δHf values. As with most applications of Bayesian methods, our approach greatly improved the results (i.e. decreased the size of the potential area of origin). Area of origin decreased by 3 to 5-fold on average, but ranged up to a 10-fold improvement. We recommend this approach in future studies of migratory connectivity and suggest that our methodology could be applied more broadly to the study of dispersal, sources of productivity of migratory populations, and a range of evolutionary phenomena. [ABSTRACT FROM AUTHOR]- Published
- 2012
- Full Text
- View/download PDF
5. Growth Decline Linked to Warming-Induced Water Limitation in Hemi-Boreal Forests.
- Author
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Xiuchen Wu, Hongyan Liu, Dali Guo, Anenkhonov, Oleg A., Badmaeva, Natalya K., Sandanov, Denis V., and Bohrer, Gil
- Subjects
FORESTS & forestry ,TAIGAS ,CLIMATE change ,TREE growth ,FOREST ecology ,SOIL moisture - Abstract
Hemi-boreal forests, which make up the transition from temperate deciduous forests to boreal forests in southern Siberia, have experienced significant warming without any accompanying increase in precipitation during the last 80 years. This climatic change could have a profound impact on tree growth and on the stability of forest ecosystems in this region, but at present evidence for these impacts is lacking. In this study, we report a recent dramatic decline in the growth of hemi-boreal forests, based on ring width measurements from three dominant tree-species (Pinus sylvestris, Larix sibirica and Larix gmelinii), sampled from eight sites in the region. We found that regional tree growth has become increasingly limited by low soil water content in the pre- and early- growing season (from October of the previous year to July of the current year) over the past 80 years. A warming-induced reduction in soil water content has also increased the climate sensitivity of these three tree species. Beginning in the mid-1980s, a clear decline in growth is evident for both the pine forests and the larch forests, although there are increasing trends in the proxy of soil water use efficiencies. Our findings are consistent with those from other parts of the world and provide valuable insights into the regional carbon cycle and vegetation dynamics, and should be useful for devising adaptive forest management strategies. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
6. Uneven Large-Scale Movement Patterns in Wild and Reintroduced Pre-Adult Bearded Vultures: Conservation Implications
- Author
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David Serrano, Rafael Arenas, Daniel Hegglin, José A. Donázar, Martina Carrete, Antoni Margalida, Bohrer, Gil, Ministerio de Ciencia e Innovación (España), Junta de Andalucía, Ministerio de Medio Ambiente (España), and Generalitat de Catalunya
- Subjects
Conservation of Natural Resources ,Population ,Endangered species ,Population genetics ,lcsh:Medicine ,Metapopulation ,Biology ,Behavioral Ecology ,Ornithology ,biology.animal ,Megafauna ,Spatial and Landscape Ecology ,Animals ,education ,lcsh:Science ,Species Extinction ,Falconiformes ,Vulture ,Conservation Science ,education.field_of_study ,Multidisciplinary ,Ecology ,lcsh:R ,Biodiversity ,Terrestrial Environments ,Europe ,Habitat ,Evolutionary Ecology ,Biological dispersal ,570 Life sciences ,biology ,590 Animals (Zoology) ,lcsh:Q ,Population Ecology ,Zoology ,Research Article ,Ecological Environments - Abstract
After the quasi-extinction of much of the European vertebrate megafauna during the last few centuries, many reintroduction projects seek to restore decimated populations. However, the future of numerous species depends on the management scenarios of metapopulations where the flow of individuals can be critical to ensure their viability. This is the case of the bearded vulture Gypaetus barbatus, an Old World, large body-sized and long-lived scavenger living in mountain ranges. Although persecution in Western Europe restrained it to the Pyrenees, the species is nowadays present in other mountains thanks to reintroduction projects. We examined the movement patterns of pre-adult non-breeding individuals born in the wild population of the Pyrenees (n = 9) and in the reintroduced populations of the Alps (n = 24) and Andalusia (n = 13). Most birds were equipped with GPS-GSM radio transmitters, which allowed accurate determination of individual dispersal patterns. Two estimators were considered: i) step length (i.e., the distance travelled per day by each individual, calculated considering only successive days); and ii) total dispersal distance (i.e., the distance travelled between each mean daily location and the point of release). Both dispersal estimators showed a positive relationship with age but were also highly dependent on the source population, birds in Andalusia and Alps moving farther than in Pyrenees. Future research should confirm if differences in dispersal distances are the rule, in which case the dynamics of future populations would be strongly influenced. In summary, our findings highlight that inter-population differences can affect the flow of individuals among patches (a key aspect to ensure the viability of the European metapopulation of the endangered bearded vulture), and thus should be taken into account when planning reintroduction programs. This result also raises questions about whether similar scenarios may occur in other restoration projects of European megafauna, The authors acknowledge Ministerio de Medio Ambiente, Tragsatec, Generalitat de Catalunya, Junta de Andalucía, Fundación Gypaetus, Gobierno de Navarra, Nationalpark Hohe Tauern, Parc National du Mercantour, Parco Naturale delle Alpi Marittime, Nationalpark Stilfserjoch and Parc naturel régional du Vercors. MC was supported by a Ramón y Cajal research contract from the Ministerio de Ciencia e Innovación (RYC-2009-04860).
- Published
- 2013
7. Spatial characteristics of tree diameter distributions in a temperate old-growth forest
- Author
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Yanbo Wei, Klaus von Gadow, Chunyu Zhang, Xiuhai Zhao, and Bohrer, Gil
- Subjects
0106 biological sciences ,ved/biology.organism_classification_rank.species ,lcsh:Medicine ,Plant Science ,Old-Growth Forest ,Tree Diameter ,Spatial Characteristics ,01 natural sciences ,Shrub ,Trees ,Soil ,Community Assembly ,lcsh:Science ,media_common ,Multidisciplinary ,geography.geographical_feature_category ,Ecology ,Temperate forest ,Agriculture ,Forestry ,Plants ,Old-growth forest ,Attraction ,Community Ecology ,Ecosystem Functioning ,Research Article ,media_common.quotation_subject ,Forest management ,Dendrology ,Environment ,Biology ,010603 evolutionary biology ,Ecosystems ,Competition (biology) ,Species Specificity ,Plant-Environment Interactions ,Forest ecology ,Community Structure ,Ecosystem ,Spatial Analysis ,geography ,ved/biology ,Plant Ecology ,lcsh:R ,Computational Biology ,Models, Theoretical ,15. Life on land ,lcsh:Q ,Physical geography ,Ecosystem Modeling ,010606 plant biology & botany - Abstract
This contribution identifies spatial characteristics of tree diameter in a temperate forest in north-eastern China, based on a fully censused observational study area covering 5006600 m. Mark correlation analysis with three null hypothesis models was used to determine departure from expectations at different neighborhood distances. Tree positions are clumped at all investigated scales in all 37 studied species, while the diameters of most species are spatially negatively correlated, especially at short distances. Interestingly, all three cases showing short-distance attraction of dbh marks are associated with light-demanding shrub species. The short-distance attraction of dbh marks indicates spatially aggregated cohorts of stems of similar size. The percentage of species showing significant dbh suppression peaked at a 4 m distance under the heterogeneous Poisson model. At scales exceeding the peak distance, the percentage of species showing significant dbh suppression decreases sharply with increasing distances. The evidence from this large observational study shows that some of the variation of the spatial characteristics of tree diameters is related variations of topography and soil chemistry. However, an obvious interpretation of this result is still lacking. Thus, removing competitors surrounding the target trees is an effective way to avoid neighboring competition effects reducing the growth of valuable target trees in forest management practice. peerReviewed
- Published
- 2013
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