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249 results for “hare”
Litterfall and Hare Pellet Summary at Bonanza Creek LTER Control Plots (1985 - Present)
Litterfall weights and Hare Pellet counts at LTER Control Plots within the Bonanza Creek Experimental Forest and the Caribou Poker Creek Research Watershed.
Supplementary Material to the Publication Genotyping of Francisella tularensis subsp. holarctica from Hares in Germany
<p>Supplementary Material in Open Data Format to Publication Genotyping of Francisella tularensis subsp. holarctica from Hares in Germany</p>
White Spruce Seedling Demography and Browsing by Snowshoe Hares Inside and Outside the Moose-spruce Exclosures located along the Tanana River
This study started in September 2002 focused on the indirect effect of moose browsing on white spruce regeneration on the Tanana River floodplain. Twelve exclosures (7m X 10m, 2m high), with adjacent control plots of the same size, were constructed using chain-link fence panels. Exclosures were located along the Tanana River between FP 1A and FP 1C and instrumented with Hobo Microstations for monitoring of soil and air temperature, relative humidity, and PAR. Browsing effects on deciduous vegetation (biomass removal and canopy height) and soil properties were analyzed in relation to the performance (germination, growth and biochemistry) of planted white spruce seeds and seedlings (n=98/exclosure). Additionally, direct browsing by snowshoe hares on spruce seedlings (growth and survival) was evaluated in relation to canopy cover and terrace age. The study is ongoing. White spruce seedling height, basal diameter, browsing history, and survival were measured inside and outside the ten remaining paired exclosure and control plots located along the Tanana River floodplain in the summer of 2014.
Known-fate survival information for radio-tagged snowshoe hares captured in Bonanza Creek Experimental Forest from June 2008 to November 2012
This dataset contains known-fate survival information for radio-tagged snowshoe hares captured in two 200 x 450 m live-trapping grids in Bonanza Creek Experimental Forest from June 2008 to November 2012. The data can be sorted and viewed by year, site, number at risk, and number of mortalities.
Snowshoe hare physical data in Bonanza Creek Experimental Forest: 1999-Present
Snowshoe hares, Lepus americanus, are a 'keystone' prey species in northern boreal forests and experience population fluctuations of 8-11-years. Despite intense responses of both vegetation and predators to changes in hare densities, landscape-scale comparisons of hare populations in Alaska have been limited to qualitative descriptions. We conducted capture-recapture studies of snowshoe hares at 5 locales in the Tanana valley, from Tok in the east to Clear in the west from 1999 to 2002. Snowshoe hare densities were highest in 1999 ( =6.36 ha-1, SE=0.63) and declined thereafter. We were unable to detect declines in apparent survival during declining densities in our study populations. Movement distances did not vary temporally and persistence of individuals through declining densities may be associated positively with body condition at the peak. The relationship of hare pellets and hare densities was weak and limits the utility of this methodology for estimating hare densities in Interior Alaska.
Snowshoe hare pellet count data in Bonanza Creek Experimental Forest
Snowshoe hares, Lepus americanus, are a 'keystone' prey species in northern boreal forests and experience population fluctuations of 8-11-years. Despite intense responses of both vegetation and predators to changes in hare densities, landscape-scale comparisons of hare populations in Alaska have been limited to qualitative descriptions. We conducted capture-recapture studies of snowshoe hares at 5 locales in the Tanana valley, from Tok in the east to Clear in the west from 1999 to 2002. Snowshoe hare densities were highest in 1999 ( =6.36 ha-1, SE=0.63) and declined thereafter. We were unable to detect declines in apparent survival during declining densities in our study populations. Movement distances did not vary temporally and persistence of individuals through declining densities may be associated positively with body condition at the peak. The relationship of hare pellets and hare densities was weak and limits the utility of this methodology for estimating hare densities in Interior Alaska.
Fates and morphometrics of snowshoe hares collared in Bonanza Creek Experimental Forest from 2008 to present
This dataset contains the fates and morphometric measurements of snowshoe hares collared in Bonanza Creek Experimental Forest, including dates of collaring and recovery, cause or mortality, weight, hind foot length, and sex.
Structural cover at snowshoe hare predation sites in Bonanza Creek Experimental Forest from 2008 to 2012
This dataset contains the horizontal and canopy cover measured at predation sites of snowshoe hares that were collared in Bonanza Creek Experimental Forest.
White spruce seedling demography and browsing by snowshoe hares inside and outside the large herbivore exclosures located along the Tanana River, summer 2014
White spruce seedling height, age, basal diameter, browsing history, and density were measured inside and outside the seven remaining paired exclosure and control plots located along the Tanana River floodplain in the summer of 2014.
White spruce seedling demography and browsing by snowshoe hares was measured at 12 locations along the Tanana River, summer 2014
Herbivores have the capacity to modify plant community composition and ecosystem structure and function via browsing. For example, moose and snowshoe hare facilitate succession in Alaska's boreal forest by preferentially browsing early successional species over late successional conifers. Snowshoe hares also eat conifers, including white spruce, and this browsing may affect the pattern of spruce establishment over time. We measured over 800 spruce at 18 locations along the Tanana River floodplain in interior Alaska, USA and demonstrated that the proportion of spruce browsed annually positively correlates with annual hare abundance.
White spruce demography and herbivory by snowshoe hares measured along elevational gradients in Denali National Park I - Site Data
Treelines in Alaska are advancing in elevation and latitude because of climate warming, which is expanding the habitat available for boreal wildlife species, including snowshoe hares (Lepus americanus). Snowshoe hares are already present in tall shrub communities beyond treeline and are the main browser of white spruce (Picea glauca), the dominant tree species at treeline in Alaska. We investigated the processes involved in a 'snowshoe hare filter' to white spruce establishment near treeline in Denali National Park. Because multiple factors interact to influence browsing of spruce, including the hare cycle, snow depth and the characteristics of surrounding vegetation, we collected an array of site variables relevant to spruce-hare interactions in Denali National Park, Alaska. Site variables collected included elevation, landscape position, vegetative cover, and the density of white spruce seedlings, saplings and trees.
White spruce demography and herbivory by snowshoe hares measured along elevational gradients in Denali National Park II - Sub Plot Data
Treelines in Alaska are advancing in elevation and latitude because of climate warming, which is expanding the habitat available for boreal wildlife species, including snowshoe hares (Lepus americanus). Snowshoe hares are already present in tall shrub communities beyond treeline and are the main browser of white spruce (Picea glauca), the dominant tree species at treeline in Alaska. We investigated the processes involved in a 'snowshoe hare filter' to white spruce establishment near treeline in Denali National Park. We hypothesized that surrounding vegetation would influence the likelihood of spruce being browsed by hares. Therefore, at each plot we estimated ramet density for all associated woody vegetation using one square-meter subplots. Within these subplots we also counted the total number of hare fecal pellets found on the ground.
White spruce demography and herbivory by snowshoe hares measured along elevational gradients in Denali National Park III - Spruce Data
Treelines in Alaska are advancing in elevation and latitude because of climate warming, which is expanding the habitat available for boreal wildlife species, including snowshoe hares (Lepus americanus). Snowshoe hares are already present in tall shrub communities beyond treeline and are the main browser of white spruce (Picea glauca), the dominant tree species at treeline in Alaska. We investigated the processes involved in a 'snowshoe hare filter' to white spruce establishment near treeline in Denali National Park. We modeled the pattern of spruce establishment from 1970 to 2009 and found that fewer spruce established during periods of high hare abundance. To do so, we measured several demographic attributes of white spruce in Denali National Park, including spruce height, basal diameter, browsing history and age.
White spruce demography and herbivory by snowshoe hares measured at latitudinal treeline in the Brooks Range, AK I - Site Data
Treelines in Alaska are advancing in elevation and latitude because of climate warming, which is expanding the habitat available for boreal wildlife species, including snowshoe hares (Lepus americanus). Snowshoe hares are already present in tall shrub communities beyond treeline and are the main browser of white spruce (Picea glauca), the dominant tree species at treeline in Alaska. We investigated the processes involved in a 'snowshoe hare filter' to white spruce establishment near latitudinal treeline in the Brooks Range, Alaska. Site variables collected included latitude, landscape position, vegetative cover, and the density of white spruce seedlings, saplings and trees.
White spruce demography and herbivory by snowshoe hares measured at latitudinal treeline in the Brooks Range, AK II - Sub Plot Data
Treelines in Alaska are advancing in elevation and latitude because of climate warming, which is expanding the habitat available for boreal wildlife species, including snowshoe hares (Lepus americanus). Snowshoe hares are already present in tall shrub communities beyond treeline and are the main browser of white spruce (Picea glauca), the dominant tree species at treeline in Alaska. We investigated the processes involved in a 'snowshoe hare filter' to white spruce establishment near latitudinal treeline in the Brooks Range, Alaska. We hypothesized that surrounding vegetation would influence the likelihood of spruce being browsed by hares. Therefore, at each plot we estimated ramet density for all associated woody vegetation using one square-meter subplots. Within these subplots we also counted the total number of hare fecal pellets found on the ground.
White spruce demography and herbivory by snowshoe hares measured at latitudinal treeline in the Brooks Range, AK III - Spruce Data
Treelines in Alaska are advancing in elevation and latitude because of climate warming, which is expanding the habitat available for boreal wildlife species, including snowshoe hares (Lepus americanus). Snowshoe hares are already present in tall shrub communities beyond treeline and are the main browser of white spruce (Picea glauca), the dominant tree species at treeline in Alaska. We investigated the processes involved in a 'snowshoe hare filter' to white spruce establishment near latitudinal treeline in the Brooks Range, Alaska. To understand how hare browsing may affect the rate at which seedlings escape herbivory, we measured several demographic attributes of white spruce in, including spruce height, basal diameter, browsing history and age.
Reactive response to predation risk affects foraging time of hares, yet not their phosphorus intake
<p>Antipredator responses could affect nutrient intake, which could lead to nutritional deficits. However, little is known about the antipredator response of small herbivores because most are nocturnal or crepuscular and therefore very difficult to study in the field. Therefore, we experimentally assessed the effect of a reactive response to predation risk on the nutrient (i.e., phosphorous) intake of the European hare (<em>Lepus</em> <em>europaeus</em>) using three different playback sounds. Additionally, we studied the time spent being costly vigilant, the time spent foraging, and the vegetation height in which the hares were present using accelerometers and GPS. Our results showed that elevated predation risk from our playback experiment did not affect the (1) phosphorus intake, (2) time spent being costly vigilant, and (3) time spent in tall vegetation. However, elevated predation risk did increase the time spent foraging. Possibly hares spent more time foraging with an increased predation risk because hares cannot seek refuge from predators. Additionally, the effect on phosphorus intake could be weak because phosphorous intake does not benefit a flight escape, while the reactive response acts late in the predation sequence limiting the effect on hare ecology. Prey anti-predator responses seem strongly related to the escape tactics of prey species that can differ between different habitats and the time of the day. More detailed field studies are necessary to get a better insight into species' anti-predator-food tactics.</p>
Experimental repatriation of snowshoe hares along a southern range boundary reveals historical community interactions
<p>Climate change is altering interspecific interactions globally, yet community-level responses are difficult to predict due to both the direct and indirect effects of changing abiotic and biotic conditions. Snowshoe hares (<i>Lepus americanus</i>) are particularly vulnerable to decreasing snow cover and resultant camouflage mismatch. This species shares a suite of predators with alternative prey species including porcupines (<i>Erethizon dorsatum</i>) and ruffed grouse (<i>Bonasa umbellus</i>), and all three species historically exhibited synchronized population dynamics. Recently, the community has become partially disassembled, notably with the loss of snowshoe hares and associated enemy-mediated indirect interactions resulting from declining snow duration. Specifically, we hypothesized that the extirpation of hares in the early 1990s indirectly increased predation pressure on ruffed grouse and porcupines. To test our hypothesis, we experimentally translocated 96 snowshoe hares to a site within a regional ecotone between northern and southern forests where snowshoe hares were recently extirpated and monitored community members before, during and after translocation. Ruffed grouse were only loosely associated with the biotic interactions that linked porcupines and snowshoe hares, likely due to predation occurring from avian predators and strong negative direct effects of declining winter snow depths. In contrast, predation of neonate porcupines was virtually non-existent following repatriation, compared to periods without hares. This abrupt attenuation of predation did not increase overall survival due to increased non-predation mortality from cold, early spring weather. Porcupines directly benefitted from warming winters: decreased snow cover increased adult survival and warmer temperatures around parturition increased maternal condition and reduced non-predation causes of mortality for neonates. Our experimental manipulation suggests that enemy-mediated indirect interactions were likely important features of this community; however, climate change has disrupted these interactions, resulting in extirpation of a central prey species (snowshoe hare) and increased predation of an alternative prey species (porcupine). We show complex effects from climate change with some species directly and negatively affected, while others benefitted from direct effects of warming winters, but suffered negative effects from indirect interactions. Absent snowshoe hares and associated biotic interactions, continued persistence of this community module is unlikely, potentially resulting in altered no-analogue communities along trailing edge distributions.</p>
Figure 3 in Designation of a Neotype for the Dwarf Sea Hare Aplysia concava G. B. Sowerby I, 1833, and a Review of the Status of Aplysia norfolkensis G. B. Sowerby II, 1869 (Mollusca: Heterobranchia)
Figure 3. Light microscope image of Aplysia norfolkensis shell, (a) dorsal view, (b) ventral view, specimen AMS C.55733, collected by Brazier, J., 25 June 1892, Bradleys Head, Port Jackson, Sydney, NSW, Australia. Photograph: M. Nimbs.
Figure 2 in Designation of a Neotype for the Dwarf Sea Hare Aplysia concava G. B. Sowerby I, 1833, and a Review of the Status of Aplysia norfolkensis G. B. Sowerby II, 1869 (Mollusca: Heterobranchia)
Figure 2. Original descriptions and figure illustrations of shells for Aplysia concava G. B. Sowerby I, 1833: vol. 2, p. 243, pl. 235, figs 24a,b; and Aplysia norfolkensis G. B. Sowerby II, 1869: vol. 17, p. 216, pl. 10, figs 42a,b. Sourced from Biodiversity Heritage Library, (see Sowerby I, 1833; Sowerby II, 1869).
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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)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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