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138 results for “Elevation change”
Changes in microbial community structure and functioning with elevation are linked to local soil characteristics as well as climatic variables
<p>Mountain forests are important carbon stocks but are threatened by increased insect outbreaks and climate driven forest conversion. Soil microorganisms play an eminent role in nutrient cycling in forests and form the basis of soil food webs. Uncovering the driving factors shaping microbial communities and functioning at mountainsides worldwide is of importance to better understand their dynamics at local and global scales. We investigated microbial communities and their drivers along an elevational gradient of primary forests at Changbai Mountain, China. We analysed substrate-induced respiration and phospholipid fatty acids (PLFA) in litter and two soil layers at seven sites. In the litter layer the increase in microbial biomass (Cmic) as well as in stress indicator ratios with elevation were negatively correlated with Ca concentrations indicating increased nutritional stress in high microbial biomass communities at sites with lower Ca availability. PLFA profiles in litter separated low and high elevations, this was less pronounced in soil, suggesting that leaflitter functions as buffer for soil microbial communities. Annual variations in temperature correlated with PLFA profiles in all layers, while annual variations in precipitation correlated with PLFA profiles in upper soil only. Furthermore, the availability of resources, soil moisture, Ca concentrations and pH structured the microbial communities. Pronounced changes in Cmic and stress indicator ratios in the litter layer between pine dominated (800 – 1100 m) and spruce dominated (1250 – 1700 m) forests indicated a shift in the structure and functioning of microbial communities between forest types. The study highlights strong changes in microbial community structure and functioning along elevational gradients, but also shows that these changes and their driving factors vary between layers. Besides annual variations in temperature and precipitation, carbon accumulation and nitrogen acquisition shape changes in microbial communities with elevation at Changbai Mountain.</p>
Staying in situ or shifting range under ongoing climate change: A case of an endemic herb in the Himalaya-Hengduan Mountains across elevational gradients
<p><span><strong>Aim</strong>:</span><span> How species respond to ongoing climate change has been a hot research topic, especially with the controversy in shifting range (movement) or persisting in local habitat (<em>in situ</em>) as the primary response. Assessing the relative roles of range shifts, phenotypic plasticity and genetic adaptation helps us predict the evolutionary fate of species. We aim to explore the evolutionary strategies of plants under climate change from a keystone herb in alpine ecosystems, <em>Mirabilis</em> <em>himalaica</em>, along its elevational gradient.</span></p> <p><span><strong>Location</strong>:</span><span> Himalaya-Hengduan Mountains, China.</span></p> <p><span><strong>Methods</strong>: </span><span>We combined evidence from population genomics and ecological data in both space and time to investigate the state of "staying" or "moving". We identified migration events by assessing historical and contemporary gene flow, and changes in species distribution. Morphological variation was compared by measuring five traits using specimen data. Moreover, we explored climate-driven genetic variation and local selection regimes acting on populations in the alpine landscape along an elevational gradient.</span></p> <p><span><strong>Results</strong>: </span><span>Our results argue that staying <em>in situ</em> by morphological variation and local genetic evolution rather than range shifting plays an important role in <em>M</em>. <em>himalaica</em> response to climate change. We first found trace evidence of upward or climatic-driven shifting along an elevational gradient, although asymmetric gene flow was restricted within microenvironments of mid-elevational populations. Furthermore, morphological variation comparisons revealed clinal variation, as resource allocation showed a declining pattern in vegetative growth but increased reproductive growth with increasing elevation. Outlier tests and environment association analyses indicated adaptative loci primarily related to thermal-driven selection and continuous adaptations to high elevation in the Himalaya-Hengduan Mountains. </span></p> <p><span><strong>Main conclusions</strong>:</span><span> Our findings show <em>M</em>. <em>himalaica</em> may persist in local habitats rather than shifting range under climate change, exhibiting a low risk of genomic vulnerability in current habitats. This study has important implications for improving our understanding of the evolutionary response in alpine </span><span>plants to climate change.</span></p>
Effects of Allopurinol on Inflammation and Ultrasonographic Changes in People With Elevated Uric Acid But no Symptoms
ClinicalTrials.gov study NCT04012294. IPD Sharing: NO. Countries: 1. Publications: 33.
Data from: Seasonal change in trophic niche of adfluvial arctic grayling (Thymallus arcticus) and coexisting fishes in a high-elevation lake system
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Data from: Changes in seed predation along a 2300-m elevational gradient on a tropical mountain in Myanmar: a standardized test with 32 non-native plant species
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Data from: Multi-trophic guilds respond differently to changing elevation in a subtropical forest
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Data from: Forest structure determines spatial changes in avian community along an elevational gradient in tropical Africa
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Data from: Mediating water temperature increases due to livestock and global change in high elevation meadow streams of the Golden Trout Wilderness
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Data from: Changes in host-parasitoid food web structure with elevation
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Data from: Trophic niches of Collembola communities change with elevation but also with body size and life form
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Data from: Subtle changes in elevation shift bat-assemblage structure in Central Amazonia
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Data from: Elevational changes in the avian community of a Mesoamerican cloud forest park
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Data from: Different temperature perception in high-elevation plants: new insight into phenological development and implications for climate change in the alpine tundra
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Data from: Non-climatic constraints on upper elevational plant range expansion under climate change
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The roles of acclimation and behavior in buffering climate change impacts along elevational gradients
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Data from: Variation in growth and defence traits among plant populations at different elevations: implications for adaptation to climate change
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Diversity and phylogenetic community structure across elevation during climate change in a family of hyperdiverse neotropical beetles (Staphylinidae)
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Elevation and landscape change drive the distribution of a montane, endemic grassland bird
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Independent variation of avian sensitivity to climate change and trait-based adaptive capacity along a tropical elevational gradient
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Staying in situ or shifting range under ongoing climate change: A case of an endemic herb in the Himalaya-Hengduan Mountains across elevational gradients
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OpenNeuro
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