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9,671 results for “Leaf”
Survey of aspen leaf mining and leaf defenses, including foliar phenolic glycosides and extrafloral nectaries
This dataset characterizes the insect damage levels and chemical defenses of aspen (Populus tremuloides) leaves collected from multiple sites near Fairbanks, Alaska in June 2007. The intent of the data set was to relate leaf mining damage by the aspen leaf miner, Phyllocnistis populiella, to the concentration of phenolic glycosides (secondary metabolites; putative defensive compounds) in leaves.
Long term consequences of aspen leaf miner outbreak for plant performance
This dataset represents the results of experimental suppression of herbivory by the aspen leaf miner, Phyllocnistis populiella, over a period of seven years, between 2005 and 2012. There were two study sites, one at Bonanza Creek LTER and the other near the summit of Ester Dome. Reported here are mortality, die-back, and initial and final sizes of aspen ramets.
Consequences of aspen leaf miner outbreak for plant performance
This dataset represents the results of experimental suppression of herbivory by the aspen leaf miner, Phyllocnistis populiella, over a period of three years, 2005 to 2007. There were two study sites, one at Bonanza Creek LTER and the other near the summit of Ester Dome. Reported here are herbivory and growth of aspen ramets.
Induction of aspen chemical defense by leaf mining, tested experimentally in 2006
This dataset summarizes the result of a manipulative experiment designed to test whether natural levels of damage by the aspen leaf miner, Phllocnistis populiella, causes the induction of foliar phenolic glycosides in small aspen ramets in the field.
Induction of aspen chemical defense by leaf mining, tested experimentally in 2007.
This dataset summarizes the result of a manipulative experiment designed to test the time course of phenolic glycoside induction by small aspen (Populus tremuloides) in response to leaf mining by the aspen leaf miner, Phyllocnistis populiella.
Nitrogen and Phosphorus resorption of thin-leaf alder growing in control, N-fertilized, and P-fertilized plots across a floodplain successional gradient.
This file includes data for leaf N and P concentrations, specific leaf weight, and N and P resorption for thin-leaf alder during the 2009 growing in control, N-fertilized, and P-fertilized stands in early-, mid- and late-successional stages along the Tanana River.
MODIS Leaf Area Index estimates for Alaska: 2002
The MODIS Leaf Area Index (LAI) Product is a global product produced every 8 days. The Leaf Area Index is estimated by a radiative transfer model assuming a given distribution of biome types within each pixel. The LAI Product was evaluated for the period of May 2002 to September 2002. The temporal pattern of spring greenup and fall senescence appeared reasonable across a large latitudinal transect from the Kenai Peninsula to the Arctic Coastal Plain. The temporal pattern also appeared reasonable across an elevational transect from Bonanza Creek Experimental Forest to Caribou Poker Creek Research Watershed to Eagle Summit. The positional accuracy and spatial pattern LAI was judged excellent by comparing the M2002 maximum LAI for the Survey Line Burn with a Landsat ETM+ image. However, there were two consistent problems with the LAI index at all spatial scales. First, a dip in maximum LAI during the green-up period most likely indicated cloud contamination of pixels. Second, the maximum 2002 LAI estimate was unrealistically high (>6.5) in many areas of Alaska. The accuracy of global estimates of leaf area and vegetation indices are suspect for high latitude areas due to several factors: 1) There is no tundra or taiga biome used in the leaf area index radiative transfer model. 2) Although a cloud-screen algorithm is applied on the front-end of processing, sub-pixel cloud contamination may occur over much of Alaska. 3) Subpixel broadleaf shrubs may lead to an overestimate of leaf area index and inflate vegetation indices.This dataset contains MOD15 leaf area index (LAI) and fraction of photosynthetically absorbed radiation (FPAR) for most of Alaska during the 2002 growing season. The data are in hdf format, with one file for each MODIS tile, for each 8-day composite period. The original quality control bits are included in each hdf file. The data are in the integerized sinusoidal projection with approzimately 1-km pixel size. The files were submitted in winzip format. T
Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating and Drying Research (DryPEHR): leaf C, N, delta-13-C, delta-N-15 2011-2019
This drying and warming experiment addresses the following questions: 1) Does ecosystem drying, warming and permafrost thaw cause a net release or uptake of C from the ecosystem to the atmosphere?, 2) Does the decomposition of old C that comprises the bulk of the soil C pool influence ecosystem C loss? 3) How do drying and warmign affect plant communities and ecosystem properties? We are answering these questions using a combined warming and drying experiment (DryPEHR), which is situated with the Carbon in Permafrost Experimental Heating Research (CiPEHR) project and located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. Warming treatment here refers to growing season air temperature warming (~1C) using open top chambers (OTC) combined with soil 'warming' using snow fences during the snow covered months. Drying is achieve using an automated pumping system that lowers the water table in the dry plots. Soil warming began in 2008; OTCs and drying in 2011. This data set includes foliar %C, %N, delta-13-C, delta-N-15 from green leaves collected in July and from senesced leaves collected in September.
Murphy Dome: Moss (Hylocomium splendens) biomass results from a moss transplant and leaf litter manipulation experiment in three pairs of adjacent black spruce and birchs stands.
This dataset contains moss (Hylocomium splendens) growth from individual moss shoots within moss transplants in black spruce and paper birch stands. 10 mosses were marked with PVC beads in June 2013 and then each moss segment was measured in the field in June and September of 2013, 2014 and June and August 2015. All samples were harvested in 2015 and their dry weights were calculated. Moss biomass from other time periods were estimated using allometric equations. The data was collected in three blocks (A, B, and C) of adjacent black spruce and paper birch stands at Murphy Dome (access via Cache Creek road).
Murphy Dome: Moss (Hylocomium splendens and Pleurozium schreberi) biomass results from a birch leaf litter and leachates manipulation experiment in a black spruce stand.
This dataset contains moss (Hylocomium splendens and Pleurozium schreberi) growth from individual moss shoots in a black spruce stand. 10 H. splendens and 5 P. schreberi were marked with PVC beads and measured in September 2014 and then each moss segment was measured again August 2015. All samples were harvested in 2015 and their dry weights were calculated. Moss biomass from other time periods were estimated using allometric equations. The data was collected in the spruce stands of block A only at Murphy Dome (access via Cache Creek road).
Murphy Dome: Covariates measured on the sampling units of moss (Hylocomium splendens) from a moss transplant and leaf litter manipulation experiment in three pairs of adjacent black spruce and birchs stands. This data is associated to the file MD_MossBiomass_2013-2015.xlsx
This data contains sampling unit level variables associated with the moss measurements from MD_MossBiomass_2013-2015.txt. It include the percent cover of leaf litter through time, fungus cover in 2015, moisture in 2015, and percent openness of the tree canopy measured in July 2014.
Measurements of 10 year old Alaskan paper birch saplings before and one-year after exposed to varying intensities of leaf stripping
This dataset contains woody, leaf, and resin gland measurements of Alaskan paper birch saplings before and one-year after a leaf stripping experiment. Saplings were all growing in the Boundary fire (within CPCRW and the rocket range) and thus 10 years old.
Effect of insecticide treatment on leaf damage to Salix spp within experimental plots on the Tanana River 2012-2017
This dataset contains information on the amount and type of damage to Salix leaves on insecticide-sprayed and control subplots. The intend is to (a) measure interannual variation in leaf damage on the plots, and (b) validate the spraying treatment.
Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating Research (CiPEHR): leaf SLA, C, N, P, Ca, delta-13C, delta-15N at peak biomass, 2017
The Carbon in Permafrost Experimental Heating Research (CiPEHR) project addresses the following questions: 1) Does ecosystem warming cause a net release of C from the ecosystem to the atmosphere?, 2) Does the decomposition of old C, that comprises the bulk of the soil C pool, influence ecosystem C loss?, and 3) How do winter and summer warming alone, and in combination, affect ecosystem C exchange? We are answering these questions using a combination of field and laboratory experiments to measure ecosystem carbon balance and radiocarbon isotope ratios at a warming experiment located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. This data set includes carbon (C) and nitrogen (N) elemental and isotope content in leaves collected from winter warming, summer warming, and control treatment plots at CiPEHR.
Eight Mile Lake Research Watershed, Thaw Gradient: leaf SLA, C, N, P, Ca, Mg, delta-13C, delta-15N at peak biomass, 2017
In this larger study, we are asking the question: Is old carbon that comprises the bulk of the soil organic matter pool released in response to thawing of permafrost? We are answering this question by using a combination of field and laboratory experiments to measure radiocarbon isotope ratios in soil organic matter, soil respiration, and dissolved organic carbon, in tundra ecosystems. The objective of these proposed measurements is to develop a mechanistic understanding of the SOM sources contributing to C losses following permafrost thawing. We are making these measurements at an established tundra field site near Healy, Alaska in the foothills of the Alaska Range. Field measurements center on a natural experiment where permafrost has been observed to warm and thaw over the past several decades. This area represents a gradient of sites each with a different degree of change due to permafrost thawing. As such, this area is unique for addressing questions at the time and spatial scales relevant for change in arctic ecosystems.
Tree ring, leaf mining, climate, and remote sensing data from aspen leaf miner survey sites: I - Basal area increment and d13C
This dataset contiains basal area increment (BAI) and d13C chronologies of 47 aspen cored in 2016 across four sites where leaf mining has been documented since 2004. Chronologies of BAI extend as far back as 1957 and up to 2015. Tree ring d13C chronologies extend from 2004-2015 and were measured on 23 trees from two fo the four sites.
Tree ring, leaf mining, climate, and remote sensing data from aspen leaf miner survey sites: II - Tree DBH and age
This dataset contiains tree level measurements of diameter at breast height (DBH) and age of aspen that were sampled in 2015 for tree ring anlyses. The tree ages provided are the age of the tree in 2015.
Murphy Dome: Moss-associated N-fixation measurements in a moss transplant and leaf litter manipulation experiment in black spruce and paper birch stands
This dataset contains nitrogen fixation measurements from the moss transplant experiment in the state forest on Murphy Dome (Cache Creek Road). Fixation rates were measured in August 2015 in two moss species: Hylocomium splendens and Pleurozium schreberi in black spruce and paper birch stands and associated with leaf litter manipulations.
Photoprotective leaf pigments and chlorophyll fluorescence measurements during a greenhouse drought experiment: An evolutionary perspective on functional diversity in co-occuring willow(salix) species
Thirteen willow (Salix) species occur in southeastern Minnesota and often co-occur within the same wetlands. This high local diversity is challenging to explain since closely related species are often functionally similar and density-dependent interactions such as competition and susceptibility to pests and pathogens should limit their co-occurrence. However, if willow species are partitioning resources, or if they are phylogenetically structured so that closely related species rarely co-occur, then the impact of these density-dependent processes could be reduced. In this study, I examined the role of niche partitioning in maintaining local willow diversity by comparing species physiology in a greenhouse.
Gas exchange, dieback, leaf water potential and chlorophyll content during a greenhouse drought experiment: An evolutionary perspective on functional diversity in co-occuring willow(salix) species
Thirteen willow (Salix) species occur in southeastern Minnesota and often co-occur within the same wetlands. This high local diversity is challenging to explain since closely related species are often functionally similar and density-dependent interactions such as competition and susceptibility to pests and pathogens should limit their co-occurrence. However, if willow species are partitioning resources, or if they are phylogenetically structured so that closely related species rarely co-occur, then the impact of these density-dependent processes could be reduced. In this study, I examined the role of niche partitioning in maintaining local willow diversity by comparing species physiology in a greenhouse.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.