L. SACK results 39
· Newest (Page 1/2, per page 25)
Author: L. SACK ×Clear All Filters
Search Results
Urbanisation Facilitates Intrapopulation Dietary Niche Diversity in a Generalist CarnivoreNARA Subscribed
The niche variation hypothesis predicts that members of generalist species are specialists, and that the degree of individual specialisation correlates positively with resource diversity. Urban landscapes are highly heterogeneous in resource distribution; therefore, we predicted urbanisation would be associated with narrower individual dietary niches and greater differentiation among individuals of generalist species. We used...
Snow leopard phylogeography and population structure supports two global populations with single refugial originNARA Subscribed
Snow leopards ( Panthera uncia ) inhabit the mountainous regions of High Asia, which experienced serial glacial contraction and expansion during climatic cycles of the Pleistocene. The corresponding impacts of glacial vicariance may have alternately promoted or constrained genetic differentiation to shape the distribution of genetic lineages and population structure. We studied snow leopard phylogeography across High Asia by e...
‘Water potential’ is the biophysically relevant measure of water status in vegetation relating to stomatal, canopy and hydraulic conductance, as well as mortality thresholds; yet, this cannot be directly related to measured and modelled fluxes of water at plot‐ to landscape‐scale without understanding its relationship with ‘water content’. The capacity for detecting vegetation water content via microwave remote sensing further...
In silico Mechanics of Stem Cells Intramyocardially Transplanted with a Biomaterial Injectate for Treatment of Myocardial InfarctionNARA Subscribed
Purpose Biomaterial and stem cell delivery are promising approaches to treating myocardial infarction. However, the mechanical and biochemical mechanisms underlying the therapeutic benefits require further clarification. This study aimed to assess the deformation of stem cells injected with the biomaterial into the infarcted heart. Methods A microstructural finite element model of a mid-wall infarcted myocardial region was dev...
Development of a 95 SNP panel to individually genotype mountain lions (Puma concolor) for microfluidic and other genotyping platformsNARA Subscribed
The mountain lion ( Puma concolor ) is one of the few remaining large predators in California, USA with density estimation from fecal genotypes becoming an essential component of conservation and management. In highly urbanized southern California, mountain lions are fragmented into small, inbred populations making proper marker selection critical for individual identification. We developed a panel of single nucleotide polymor...
Until recently, the only known condition in which complement could mediate transplant injury was the rare occurrence of antibody-mediated rejection, in which the original concept of antibody immunity against the transplant was supported by complementary proteins present in the serum. This has changed within the last two decades because of evidence that the processes of ischaemia–reperfusion injury followed by T cell–mediated r...
Development of 79 SNP markers to individually genotype and sex-type endangered mountain gorillas (Gorilla beringei beringei)NARA Subscribed
The mountain gorilla ( Gorilla beringei beringei ) is one of two endangered subspecies of eastern gorilla. The principle approach to monitoring the two extant mountain gorilla populations has been to use fecal surveys to obtain DNA profiles for individuals that are then used for capture-recapture-based estimates of abundance. To date, 11 to 14 microsatellites have been used for this purpose. To adapt to ongoing changes in geno...
Detecting forest response to droughts with global observations of vegetation water contentNARA Subscribed
Droughts in a warming climate have become more common and more extreme, making understanding forest responses to water stress increasingly pressing. Analysis of water stress in trees has long focused on water potential in xylem and leaves, which influences stomatal closure and water flow through the soil‐plant‐atmosphere continuum. At the same time, changes of vegetation water content (VWC) are linked to a range of tree respon...
Pleistocene origins, western ghost lineages, and the emerging phylogeographic history of the red wolf and coyoteNARA Subscribed
The red wolf ( Canis rufus ) of the eastern US was driven to near‐extinction by colonial‐era persecution and habitat conversion, which facilitated coyote ( C . latrans ) range expansion and widespread hybridization with red wolves. The observation of some grey wolf ( C . lupus ) ancestry within red wolves sparked controversy over whether it was historically a subspecies of grey wolf with its predominant “coyote‐like” ancestry...
TRY plant trait database – enhanced coverage and open accessNARA Subscribed
Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research spanning from evolutionary biology, community and functional ecology, to biodivers...
Seedling response to water stress in valley oak ( Quercus lobata ) is shaped by different gene networks across populationsNARA Subscribed
Drought is a major stress for plants, creating a strong selection pressure for traits that enable plant growth and survival in dry environments. Many drought responses are conserved species‐wide responses, while others vary among populations distributed across heterogeneous environments. We tested how six populations of the widely distributed California valley oak ( Quercus lobata ) sampled from contrasting climates would diff...
Disentangling the functional trait correlates of spatial aggregation in tropical forest treesNARA Subscribed
Environmental filtering and dispersal limitation can both maintain diversity in plant communities by aggregating conspecifics, but parsing the contribution of each process has proven difficult empirically. Here, we assess the contribution of filtering and dispersal limitation to the spatial aggregation patterns of 456 tree species in a hyperdiverse Amazonian forest and find distinct functional trait correlates of interspecific...
Front CoverNARA Subscribed
Global importance of large‐diameter treesNARA Subscribed
Aim To examine the contribution of large‐diameter trees to biomass, stand structure, and species richness across forest biomes. Location Global. Time period Early 21st century. Major taxa studied Woody plants. Methods We examined the contribution of large trees to forest density, richness and biomass using a global network of 48 large (from 2 to 60 ha) forest plots representing 5,601,473 stems across 9,298 species and 210 plan...