Effects of Growing Season Fire on Northern Bobwhite Nest Site Selection and Survival

Restoration and management of longleaf pine (Pinus palustris) communities necessitates frequent prescribed fire. Prior to human colonization of the southeastern United States thousands of years ago, longleaf pine forests burned primarily during the growing-season as a result of lightning-ignited fires. Growing-season prescribed fire may suppress woody vegetation and promote herbaceous groundcover better than dormant-season fire. Despite the potential ecological benefits of growing-season fire, many land managers use only dormant-season prescribed fire to avoid destruction of ground nests, including those from northern bobwhite (Colinus virginianus). Our objective was to determine bobwhite nest survival and nest-site selection in the presence of early, growing-season prescribed fire on a 3-year return interval. We compared vegetation composition and structure at nest sites and paired random sites to identify important predictors of nest-site selection and to evaluate the effects of habitat covariates on nest survival. We captured bobwhite and attached radio transmitters. Radio-marked individuals were tracked to locate nests and determine nest survival. We documented 2 nests that burned during a growing-season prescribed fire. All 14 nests were located within units that were burned at least 2 years prior, putting these nests at a greater risk for being destroyed by prescribed fire that occurred on a 3-year return interval. We suggest that restricting early, growing-season prescribed burning to April through early June should limit an overlap between prescribed burns and the peak of northern bobwhite nesting season, which occurred mid-July at our study site. Additionally, longer fire return intervals may be needed to allow development of woody understory structure selected by bobwhites for nesting, especially on poor soils like those on our study site in the Sandhills physiographic region

Survey of Canada Goose Feces for Presence of \u3cem\u3eGiardia\u3c/em\u3e

As resident Canada goose (Branta canadensis) populations increase throughout North America, so do the health and environmental risks associated with goose feces. Previous studies suggest that goose feces may be a conduit for transmitting Giardia, a protozoan that is parasitic to humans. We surveyed fecal droppings from free-ranging resident Canada geese for Giardia spp. at 9 sites in the Triangle area (Raleigh, Durham, and Chapel Hill) of North Carolina in 2007 and 2008. Samples (n = 234) were tested using the ProSpect® Giardia EZ Microplate Assay, and there were no positives. Our results indicate that risk of zoonotic giardiasis from Canada goose feces in the Triangle area of North Carolina is low

Audience responses to representations of family-assisted suicide on British television

Reflecting on different generic conventions, this study highlights the strengths and weaknesses of documentaries and soap operas in addressing the societal and the personal dimensions of family-assisted suicide. Based on an analysis of YouTube user comments, this study compares how audience members respond to representations of family-assisted suicide in British documentaries and soap operas broadcast between 2010 and 2016. The thematic analysis of comments shows key differences between audience engagement with factual and fictional representations. Markers of a political engagement with this sensitive social issue occur more frequently in comments on documentaries than in comments on soap operas. Comments on soap operas are frequently expressions of emotion, or displays of specialist soap opera knowledge

Phantoms of the forest: legacy risk effects of a regionally extinct large carnivore

The increased abundance of large carnivores in Europe is a conservation success, but the impact on the behavior and population dynamics of prey species is generally unknown. In Europe, the recolonization of large carnivores often occurs in areas where humans have greatly modified the landscape through forestry or agriculture. Currently, we poorly understand the effects of recolonizing large carnivores on extant prey species in anthropogenic landscapes. Here, we investigated if ungulate prey species showed innate responses to the scent of a regionally exterminated but native large carnivore, and whether the responses were affected by human-induced habitat openness. We experimentally introduced brown bear Ursus arctos scent to artificial feeding sites and used camera traps to document the responses of three sympatric ungulate species. In addition to controls without scent, reindeer scent Rangifer tarandus was used as a noncarnivore, novel control scent. Fallow deer Dama dama strongly avoided areas with bear scent. In the presence of bear scent, all ungulate species generally used open sites more than closed sites, whereas the opposite was observed at sites with reindeer scent or without scent. The opening of forest habitat by human practices, such as forestry and agriculture, creates a larger gradient in habitat openness than available in relatively unaffected closed forest systems, which may create opportunities for prey to alter their habitat selection and reduce predation risk in human-modified systems that do not exist in more natural forest systems. Increased knowledge about antipredator responses in areas subjected to anthropogenic change is important because these responses may affect prey population dynamics, lower trophic levels, and attitudes toward large carnivores. These aspects may be of particular relevance in the light of the increasing wildlife populations across much of Europe

Prescribed fire affects female white-tailed deer habitat use during summer lactation

a b s t r a c t Prescribed fire commonly is used to manage habitat for white-tailed deer (Odocoileus virginianus). Although the effects of fire on forage availability for deer have been studied, how female deer use burned areas is not well known, particularly as it relates to fire season and the years-since-fire. We used GPS tracking data from 16 adult female white-tailed deer to assess the effects of fire season and yearssince-fire on habitat use during summer lactation. Females selected unburned drainages and older (>1 yr-since-fire) burned areas, and avoided recently burned areas. Individuals with a greater percentage of their summer core area burned expanded the size of their summer home range but did not change summer core area size. Furthermore, summer core area site fidelity (i.e., % overlap between 2011 and 2012 core areas) decreased as the percentage of the 2011 summer core area burned in 2012 increased. Female deer increased selection of burned areas as years-since-fire increased, likely because there was a temporary loss of cover immediately following fire with plants slowly regenerating the subsequent growing seasons. Likewise, to avoid areas depleted of cover, females shifted their core areas away from recent burns when possible but increased their core area size when burned areas were unavoidable (i.e., a large portion of their home range was burned). Burning large contiguous areas may initially have a negative effect on female deer during lactation because of the depletion of cover

Effects of Plant Phenology and Vertical Height on Accuracy of Radio-telemetry Locations

The use of very high frequency (VHF) radio-telemetry remains wide-spread in studies of wildlife ecology andmanagement. However, few studies have evaluated the influence of vegetative obstruction on accuracy in differing habitats with varying transmitter types and heights. Using adult and fawn collars at varying heights above the ground (0, 33, 66 and 100 cm) to simulate activities (bedded, feeding and standing) and ages (neonate, juvenile and adult) of deer Odocoileus spp., we collected 5,767 bearings and estimated 1,424 locations (28-30 for each of 48 subsamples) in three habitat types (pasture, grassland and forest), during two stages of vegetative growth (spring and late summer). Bearing error was approximately twice as large at a distance of 900mfor fawn (9.98) than for adult deer collars (4.98). Of 12 models developed to explain the variation in location error, the analysis of covariance model (HT*D + C*D + HT*TBA + C*TBA) containing interactions of height of collar above ground (HT), collar type (C), vertical height of understory vegetation (D) and tree basal area (TBA) was the best model (wi¼0.92) and explained ; 71% of the variation in location error. Location error was greater for both collar types at 0 and 33 cmabove the ground compared to 66 and 100 cm above the ground; however, location error was less for adult than fawn collars. Vegetation metrics influenced location error, which increased with greater vertical height of understory vegetation and tree basal area. Further, interaction of vegetation metrics and categorical variables indicated significant effects on location error. Our results indicate that researchers need to consider study objectives, life history of the study animal, signal strength of collar (collar type), distance from transmitter to receiver, topographical changes in elevation, habitat composition and season when designing telemetry protocols. Bearing distances in forested habitat should be decreased (approximately 23% in our study) compared to bearing distances in open habitat to maintain a consistent bearing error across habitats. Additionally, we believe that field biologists monitoring neonate ungulates for habitat selection should rely on visual locations rather than using VHF-collars and triangulation

Saving the World One Native Plant at a Time

Wildlife habitat is lost as the human population and land clearing for development increase in the South. Remaining habitats are fragmented and contain high numbers of invasive, exotic plants. Suburban, manicured landscapes often lack the plant diversity and complex vegetation structure important to wildlife. Generally, developers and homeowners replant cleared grounds with exotic plants that don’t provide quality wildlife habitat. Instead, individual home or property owners can mitigate wildlife habitat loss in urban areas by landscaping with native plants following proper design principles. Furthermore, many people taking action over a large area (e.g., across a neighborhood) will help connect small blocks of habitat and allow wildlife to move across an urbanized region. Wildlife faculty and students at North Carolina State University, working with other natural resource professionals, developed a program to encourage use of native plants and ecologically sound design principles to retain wildlife habitat in urbanizing landscapes. The program integrates a variety of old and new technology transfer methods including traditional county presentations, Extension pamphlets, a video, an interactive website, and a demonstration landscape

Habitat Selection of a Declining White-tailed Deer Herd in the Central Black Hills, South Dakota and Wyoming

Habitat selection, survival rates, the Black Hills National Forest Habitat Capability Model (HABCAP), and the USDA Forest Service Geographic Information System (GlS) data base were evaluated for a declining white-tailed deer (Odocoileus virginianus dacotensis) herd in the central Black Hills of South Dakota and Wyoming. From July 1993 through July 1996, 73 adult and yearling female and 12 adult and yearling male white-tailed deer were radiocollared and visually monitored. Habitat information was collected at 4,662 white-tailed deer locations and 1,087 random locations. Natural mortality (71 %) was the primary cause of female mortality , followed by harvest (22.5%) and accidental causes (6.5%). More females died in spring (53 .2%) than in fall (22.6%), winter ( 14.5%), or summer (9 .7%). Male mortality resulted from hunting in fall (66.7%) and natural causes (e.g., coyotes, dogs, malnutrition , sickness, or unknowns) in spring (33 .3%) Survival rates for all deer by year were 62.1 % in 1993, 51.1 % in 1994, 56.4% in 1995, and 53.9% in 1996 and were similar (f = 0.691) across years. During winter, white-tailed deer selected ponderosa pine- (Pinus ponderosa) deciduous and burned pine cover types. Overstory-understory habitats selected included pine/grass-forb, pine/bearberry (Arctostaphylos uva-ursi), pine/snowbeny (Symphoricarpos albus), burned pine/grass-forb, and pine/shrub habitats. Structural stages selected included sapling-pole pine stands with \u3e 70% canopy cover, burned pine sapling-pole and saw-timber stands with \u3c 40% canopy cover. Bedding locations were represented by saw-timber pine structural stages with \u3e40% canopy cover and all sapling-pole pine structural stages; sapling-pole stands with \u3e70% canopy cover received the greatest use. White-tailed deer primarily fed in pine saw-timber structural stage with less than 40% canopy cover. Overall, selected habitats contained lower amounts of grass/forb, shrubs, and litter than random locations. Male and female deer generally bedded in areas that were characterized by greater horizontal cover than feeding and random sites. When feeding and bedding sites were combined males selected areas that were characterized by greater levels of horizontal cover than females. Winter range cover types categorized by USDA Forest Service digital map data included pine, aspen (Populus tremuloides), grasslands, water, private land, but did not account for secondary cover layers. During summer, white-tailed deer selected pine-deciduous, aspen, aspen-coniferous, spruce (Picea glauca), and spruce-deciduous cover types. Overstory-understory habitats selected included pine/juniper (Juniperus communis), aspen/shrubs, spruce/juniper, and spruce/shrub habitats. Structural stages selected included pine, aspen, and spruce sapling pole stands with all levels (0-40%, 41-70%, 71-100%) of canopy cover. All habitat types (i.e., pine, aspen, and spruce) were used as bedding locations with pine sapling-pole structural stages with \u3e70% canopy cover used most, whereas pine saw-timber structural stage with less than 40% canopy cover was primarily used for feeding. Females bedded in areas that were characterized by greater horizontal cover than feeding and random sites, whereas male feeding sites had greater horizontal cover characteristics than bedding or random locations. Summer range cover types categorized by USDA Forest Service digital map data included pine, aspen, spruce, grasslands, water, private land, non-vegetated, but did not account for secondary cover layers Based on the results of this study , I recommend that managers increase deciduous habitats, burned habitats, forage biomass, and tall shrub/sapling densities in the central Black Hills. Additionally, because disturbance factors may be forcing deer to use inferior habitats, I recommend reducing road densities in the central Black Hills. Because the white-tailed deer herd is declining, the revised coefficients for the HABCAP model may only represent use of suboptimal habitats in the central Black Hills. Therefore, the revised HABCAP coefficients presented in this study should be used as a tool to reevaluate the present HABCAP model used by the Black Hills National Forest. Finally, I recommend the USDA Forest Service incorporate horizontal cover and secondary cover information into their GIS and HABCAP model prior to using them in long term habitat decisions

Using novel spatial mark–resight techniques to monitor resident Canada geese in a suburban environment

Context. Over the past two decades, an increase in the number of resident (non-migratory) Canada geese (Branta canadensis) in the United States has heightened the awareness of human–goose interactions. Aims. Accordingly, baseline demographic estimates for goose populations are needed to help better understand the ecology of Canada geese in suburban areas. Methods. As a basis for monitoring efforts, we estimated densities of adult resident Canada geese in a suburban environment by using a novel spatial mark–resight method. We resighted 763 neck- and leg-banded resident Canada geese two to three times per week in and around Greensboro, North Carolina, over an 18-month period (June 2008 – December 2009).We estimated the density, detection probabilities, proportion of male geese in the population, and the movements and home-range radii of the geese by season ((post-molt I 2008 (16 July – 31 October), post-molt II 2008/2009 (1 November – 31 January), breeding and nesting 2009 (1 February – 31 May), and post-molt I 2009). Additionally, we used estimates of the number of marked individuals to quantify apparent monthly survival. Key results. Goose densities varied by season, ranging from 11.10 individuals per km2 (s.e. = 0.23) in breeding/nesting to 16.02 individuals per km2 (s.e. = 0.34) in post-molt II. The 95% bivariate normal home-range radii ranged from 2.60 to 3.86 kmfor males and from 1.90 to 3.15 kmfor females and female home ranges were smaller than those of male geese during the breeding/nesting and post-molt II seasons. Apparent monthly survival across the study was high, ranging from 0.972 (s.e. = 0.005) to 0.995 (s.e. = 0.002). Conclusions. By using spatial mark–resight models, we determined that Canada goose density estimates varied seasonally. Nevertheless, the seasonal changes in density are reflective of the seasonal changes in behaviour and physiological requirements of geese. Implications. Although defining the state–space of spatial mark–resight models requires careful consideration, the technique represents a promising new tool to estimate and monitor the density of free-ranging wildlife. Spatial mark–resight methods provide managers with statistically robust population estimates and allow insight into animal space use without the need to employ more costly methods (e.g. telemetry). Also, when repeated across seasons or other biologically important time periods, spatial mark–resight modelling techniques allow for inference about apparent survival

Comparison of studies estimating eastern hellbender population densities or relative abundances, organized by date of publication.

<p>Densities are expressed as number of hellbenders per 100 m² of river. Relative abundance is given by catch per unit effort (CPU), which is the number of hellbenders caught per person hour searching. Adapted with permission from Burgmeier et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0179153#pone.0179153.ref021" target="_blank">21</a>].</p