| 1. |
- Arndt, D. S., et al.
(författare)
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STATE OF THE CLIMATE IN 2017
- 2018
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Ingår i: Bulletin of The American Meteorological Society - (BAMS). - : American Meteorological Society. - 0003-0007 .- 1520-0477. ; 99:8, s. S1-S310
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Forskningsöversikt (refereegranskat)
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| 2. |
- Ades, M., et al.
(författare)
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Global Climate : in State of the climate in 2019
- 2020
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Ingår i: Bulletin of The American Meteorological Society - (BAMS). - : American Meteorological Society. - 0003-0007 .- 1520-0477. ; 101:8, s. S17-S127
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Tidskriftsartikel (refereegranskat)
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| 3. |
- Ades, M., et al.
(författare)
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GLOBAL CLIMATE
- 2020
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Ingår i: BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY. - 0003-0007 .- 1520-0477. ; 101:8
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Tidskriftsartikel (refereegranskat)
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| 4. |
- Horner, Ariel A., et al.
(författare)
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Cryptic chytridiomycosis linked to climate and genetic variation in amphibian populations of the southeastern United States
- 2017
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Ingår i: PLOS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 12:4
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Tidskriftsartikel (refereegranskat)abstract
- North American amphibians have recently been impacted by two major emerging pathogens, the fungus Batrachochytrium dendrobatidis (Bd) and iridoviruses in the genus Ranavirus (Rv). Environmental factors and host genetics may play important roles in disease dynamics, but few studies incorporate both of these components into their analyses. Here, we investigated the role of environmental and genetic factors in driving Bd and Rv infection prevalence and severity in a biodiversity hot spot, the southeastern United States. We used quantitative PCR to characterize Bd and Rv dynamics in natural populations of three amphibian species: Notophthalmus perstriatus, Hyla squirella and Pseudacris ornata. We combined pathogen data, genetic diversity metrics generated from neutral markers, and environmental variables into general linear models to evaluate how these factors impact infectious disease dynamics. Occurrence, prevalence and intensity of Bd and Rv varied across species and populations, but only one species, Pseudacris ornata, harbored high Bd intensities in the majority of sampled populations. Genetic diversity and climate variables both predicted Bd prevalence, whereas climatic variables alone predicted infection intensity. We conclude that Bd is more abundant in the southeastern United States than previously thought and that genetic and environmental factors are both important for predicting amphibian pathogen dynamics. Incorporating both genetic and environmental information into conservation plans for amphibians is necessary for the development of more effective management strategies to mitigate the impact of emerging infectious diseases.
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| 5. |
- Sletvold, Nina, et al.
(författare)
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Resource- and pollinator-mediated selection on floral traits
- 2017
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Ingår i: Functional Ecology. - : WILEY-BLACKWELL. - 0269-8463 .- 1365-2435. ; 31:1, s. 135-141
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Tidskriftsartikel (refereegranskat)abstract
- 1. Female reproductive success is predicted to be simultaneously limited by the availability of pollen and resources. Selection on floral traits results from both factors, but their relative importance and interaction is poorly understood. 2. We increased nutrient and pollen availability of the orchid Dactylorhiza lapponica in a factorial experiment to quantify resource-and pollinator-mediated selection on floral traits. Hand-pollination increased female fitness (number of fruits 9 mean fruit mass) by 74% in both nutrient treatments, whereas nutrient addition did not significantly affect female fitness. 3. There was selection for more flowers and longer spurs, and selection on spur length was significantly pollinator-mediated and of similar strength across nutrient treatments (Delta beta(poll) = 0.54 and Delta beta(poll_NPK) = 0.59). There was no statistically significant resource-mediated selection. Nutrient addition increased flower size the following year, but did not affect flower or fruit production, or selection on any trait. 4. The results demonstrate that D. lapponica does not increase flower production in response to nutrient addition, that the increase in female fitness in response to hand-pollination is not resource limited, and suggest that natural resource variation does not influence selection on floral traits. The study illustrates that crossed manipulations of pollen and resources can clarify their relative importance for selection on floral traits.
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| 6. |
- Tye, Matthew R., et al.
(författare)
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A demographic menage a trois : interactions between disturbances both amplify and dampen population dynamics of an endemic plant
- 2016
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Ingår i: Journal of Ecology. - : Wiley. - 0022-0477 .- 1365-2745. ; 104:6, s. 1778-1788
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Tidskriftsartikel (refereegranskat)abstract
- Natural and anthropogenic disturbances co-occur in most systems, but how they interact to shape demographic outcomes remains poorly understood. Such interactions may alter dynamics of populations in non-additive ways, making demographic predictions challenging when focusing on only one disturbance. Thus, understanding the interactive effects of such disturbances is critically important to determine the population viability of most species under a diversity of stressors. We used a hierarchical integral projection model (IPM), parameterized with 13years of field data across 20 populations, encompassing 2435 individuals of an endangered herb, Liatris ohlingerae. We examined interactive effects of vertebrate herbivory, fire and anthropogenic activities (sand roads) on vital rates (e.g. survival, growth, reproduction, recruitment) and ultimately on population growth rates (), to test the hypothesis that interactions amplify or dampen differences in depending on environmental contexts. We constructed megamatrices to determine coupled dynamics in individuals damaged vs. not damaged by herbivores in roadsides and in Florida scrub with different times since fire. We identified strong interactive effects of fire with herbivory and habitat with herbivory on vital rates and on population growth rates in the IPM model. We also found different patterns of variation in between habitat and time-since-fire scenarios; population growth rates were higher in roadside populations compared to scrub populations and declined with increasing time since fire. Herbivory had interactive effects with both fire and human disturbances on . Herbivory resulted in decreased differences in due to anthropogenic disturbance and slightly increased differences in due to time since fire.Synthesis. The co-occurrence of various disturbances may both amplify and dampen the effects of other disturbances on population growth rate, thus shaping complex population dynamics that are neither linear nor additive. These realistic nonlinearities represent challenges in understanding and projecting of population dynamics. Here, we examined the effects of various sources of disturbance on the population dynamics of an endangered plant species, finding complex interactions affecting population growth rates. We argue that integration of multiple, interacting stressors in IPMs will allow more accurate estimation of the overall effects of ecological processes on species viability.
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| 7. |
- Tye, Matthew R., et al.
(författare)
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Assessing seed and microsite limitation on population dynamics of a gypsophyte through experimental soil crust disturbance and seed addition
- 2017
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Ingår i: Plant Ecology. - : SPRINGER. - 1385-0237 .- 1573-5052. ; 218:5, s. 595-607
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Tidskriftsartikel (refereegranskat)abstract
- Understanding the factors limiting population growth is crucial for species management and conservation. We assessed the effects of seed and microsite limitation, along with climate variables, on Helianthemum squamatum, a gypsum soil specialist, in two sites in central Spain. We evaluated the effects of experimental seed addition and soil crust disturbance on H. squamatum vital rates (survival, growth and reproduction) across four years. We used this information to build integral projection models (IPMs) for each combination of management (seed addition or soil disturbance), site and year. We examined differences in population growth rate (lambda) due to management using life table response experiments. Soil crust disturbance increased survival of mid to large size individuals and germination. Contributions to lambda of positive individual growth (progression) and negative individual growth (retrogression) due to managements varied among years and sites. Soil crust disturbance increased lambda in the site with the highest plant density, and seed addition had a moderate positive effect on lambda in the site with lowest plant density. Population growth rate (lambda) decreased by half in the driest year. Differences in management effects between sites may represent a shift from seed to microsite limitation at increasing densities. This shift underscores the importance of considering what factors limit population growth when selecting a management strategy.
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| 8. |
- Tye, Matthew R.
(författare)
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Biotic and abiotic drivers of life-history and demographic variation in boreal orchids
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Environmental interactions, including both abiotic and biotic factors, are key drivers of life-history and population dynamics. Despite this, most population studies do not explicitly link variation in environmental factors and vital rates. Here, I combined long-term demographic data and short-term experiments in four species of long-lived boreal orchids (Dactylorhiza incarnata, Dactylorhiza lapponica, Dactylorhiza maculata, and Gymnadenia conopsea) at two sites (Nordmarka, a coastal site, and Sølendet, an inland site) in Norway to understand the effects of biotic and abiotic drivers of variation in vital rates, population dynamics and life history. More specifically, I examined if (I) demographic responses to climate are sensitive to small changes in species life history or location, (II) floral traits are under selection due to limitations of resources or pollinators, (III) pollen limited orchid species compensate for short-term reductions in pollination success, and (IV) there is a demographic advantage to multi-year gaps in reproduction.I found that relationships between demography and climate were highly variable, both among species and sites. This highlights the difficulty in transferring data from similar populations for viability analyses and for models predicting range shifts. In chapter II, I documented strong pollen limitation but no significant resource limitation of female fitness in D. lapponica, and found that pollinator-mediated selection was far stronger than resource-mediated selection on floral traits. Chapter III revealed that individuals of D. lapponica and D. incarnata did not compensate for a temporary reduction in pollination success, though exact population responses varied both by species and reproductive cohort. This shows that long-lived plants may be unable to compensate for poor pollination by increasing future reproduction, and suggests that declines in pollination may have negative demographic consequences. In chapter IV I found no evidence for individuals of D. lapponica being able to use resources saved in reproductive gaps to increase future reproductive output, suggesting that gaps are simply plastic responses to resource constraints. Overall, these results show that population-level responses to abiotic and biotic factors vary among species, locations, and with timing. This implies that considering the effects of multiple environmental drivers across multiple populations is key to further our understanding of population dynamics.
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| 9. |
- Tye, Matthew R., et al.
(författare)
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Demographic responses to climate variation depend on spatial- and life history-differentiation at multiple scales
- 2018
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Ingår i: Biological Conservation. - : Elsevier BV. - 0006-3207 .- 1873-2917. ; 228, s. 62-69
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Tidskriftsartikel (refereegranskat)abstract
- Long-term demographic data are needed for detailed viability analyses of populations threatened by climate change, but the infeasibility of obtaining such data makes it urgent to assess whether demographic responses to climatic variation can be generalized across populations and species. We used 32 years of demographic data on four species of closely related orchids (genera Dactylorhiza and Gymnadenia), replicated in a coastal and an inland region in central Norway, to test how demographic responses to climate varied among geographical regions and species. We fit generalized linear mixed models (GLMMs) to study climate effects on vital rates and included GLMMs as components in matrix models to examine climate effects on population dynamics. We found that, overall, vital rates and population growth rates of the eight populations responded independently to variation in both temperature and rainfall. Only probability of flowering showed expected regional differentiation in response to climate, despite notable regional climatic differences. Other vital rate climate relationships were structured by species or a combination of both region and species. The weak clustering of demographic responses to climate variation by species and region demonstrates that effects of climatic variation can strongly depend on variation in local habitat and life history, even among closely related populations occupying similar niches. This highlights the difficulty in transferring data from closely related and/or located populations for viability analyses and for models predicting range shifts, and a general need to account for among-population variation in demographic responses to develop successful conservation and management plans.
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| 10. |
- Tye, Matthew R., et al.
(författare)
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Pollen limitation in a single year is not compensated by future reproduction
- 2020
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Ingår i: Oecologia. - : Springer Nature. - 0029-8549 .- 1432-1939. ; 192:4, s. 989-997
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Tidskriftsartikel (refereegranskat)abstract
- Seed production is critical to the persistence of most flowering plant populations, but may be strongly pollen limited. To what extent long-lived plants can compensate pollen limitation by increasing future reproduction is poorly understood. We tested for compensation in two Dactylorhiza species that differ in reproductive investment by experimentally reducing and increasing pollination in two independent annual cohorts and monitoring demographic responses in the subsequent 2 years for the 2014 cohort and in 1 year for the 2015 cohort. Demographic rates in the second year were significantly affected by pollination treatment in both species, but specific responses differed both between species and years. There was no effect of pollination treatment on demographic responses in the third year. In sum, effects were too weak to make up for the lost reproduction; total fruit production across all 3 years was by far highest in the increased pollination treatment in both species. These results show that long-lived plants do not necessarily compensate for pollen limitation by increasing future reproduction. It further suggests that even periodic declines in pollination rates may have severe demographic consequences, particularly in populations where germination is not density dependent. This has implications for predicting plant population viability in response to changes in pollination intensity.
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