Wildlife Conservation Management Research Articles

Genetic diversity and population structure of founders from wildlife conservation management units and wild populations of critically endangered Dermatemys mawii

Many endangered freshwater turtle species are born in captivity for conservation and future reintroduction into the wild. However, in order to improve breeding programs, an assessment of the genetic diversity of the founder individuals is required to avoid genetic problems such as inbreeding, fixation of deleterious alleles, or loss of allelic diversity due to genetic drift. In this research, we assessed the genetic diversity of the founder individuals from three Wildlife Management Units (UMA) dedicated to the reproduction of Dermatemys mawii in southeast Mexico, and from three wild populations using ten microsatellite markers. Dermatemys mawii is a freshwater turtle that is critically endangered due principally to fragmentation, loss, degradation, and contamination of its habitat, in addition to hunting for human consumption. Furthermore, genetic relationships among UMAs and wild populations, as well as within each kind of group, were investigated by means of Bayesian analysis (Structure software) and discriminant analysis of principal component (DAPC). Genetic diversity in wild populations could be considered as medium, and are less than values observed for UMAs. Genetic diversity for UMAs and wild populations were discussed considering origin of individuals, translocation between UMAs, habitat quality among other factors. Genetic structure analysis highlighted an evident separation between UMAs and wild populations (Bayesian and DAPC analyses), and the hierarchical analysis of structure among UMAs reflected the origin and relationship among them, whereas geographical situation of wild populations is the best explanation for its hierarchical structure. In light of our results, some conservation and management recommendations are provided for this endangered freshwater turtle.

African elephant feeding preferences in a small South African fenced game reserve

Recent significant changes to African elephant (Loxodonta africana) populations have placed their management at the centre of the global wildlife conservation management debate, with most of the discussion surrounding population declines. However, in small, invariably fenced reserves found over much of South Africa, their numbers have expanded due to elevated levels of protection from poaching, artificial water provision, high reproductive success and lack of dispersal opportunities. Under these conditions, concerns arise surrounding the negative impacts of elephant feeding behaviour and strategy, with calls from some quarters for intervention options to address this ‘elephant problem’.Research in a small (380 km2) fenced reserve in the Limpopo province of South Africa was carried out in a variety of habitat and terrain types to assess type and level of elephant impact in relation to tree architecture. Impact was assessed to be predominantly non-lethal, with only a small proportion of surveyed trees assessed to have been lethally impacted upon. Tree species exhibiting certain architectural characteristics, notably trees with a wider canopy measurement than their overall height measurement, were particularly prone to negative feeding impacts, especially damage to primary and secondary branches. Trees with wide basal stem circumferences were most prone to being killed by elephants, with the overall likelihood of a tree experiencing the most severe impact types increasing with basal stem circumference. In contrast, an increase in height was shown to decrease the likelihood of a tree experiencing severe impact types, indicating that tall trees are less likely to suffer mortality due to elephant impact.We suggest that managers of fenced elephant reserves conduct baseline monitoring of elephant impacts. These studies indicate that width at widest point, and to a lesser extent height at widest point are likely to be useful additions to baseline vegetation monitoring. This will identify the level and type of elephant induced impacts, specifically revealing those locations within fenced reserves with a significant component of target tree species/morphologies. Ultimately this will both initiate and direct preventative management measures, we suggest primarily in the form of exclusion fencing in order to prevent access by elephants.

Spatio-temporal epidemiology of anthrax in Hippopotamus amphibious in Queen Elizabeth Protected Area, Uganda.

BackgroundAnthrax is a zoonotic disease primarily of herbivores, caused by Bacillus anthracis, a bacterium with diverse geographical and global distribution. Globally, livestock outbreaks have declined but in Africa significant outbreaks continue to occur with most countries still categorized as enzootic, hyper endemic or sporadic. Uganda experiences sporadic human and livestock cases. Severe large-scale outbreaks occur periodically in hippos (Hippopotamus amphibious) at Queen Elizabeth Protected Area, where in 2004/2005 and 2010 anthrax killed 437 hippos. Ecological drivers of these outbreaks and potential of hippos to maintain anthrax in the ecosystem remain unknown. This study aimed to describe spatio-temporal patterns of anthrax among hippos; examine significant trends associated with case distributions; and generate hypotheses for investigation of ecological drivers of anthrax.MethodsSpatio-temporal patterns of 317 hippo cases in 2004/5 and 137 in 2010 were analyzed. QGIS was used to examine case distributions; Spearman’s nonparametric tests to determine correlations between cases and at-risk hippo populations; permutation models of the spatial scan statistics to examine spatio-temporal clustering of cases; directional tests to determine directionality in epidemic movements; and standard epidemic curves to determine patterns of epidemic propagation.Key findingsResults showed hippopotamus cases extensively distributed along water shorelines with strong positive correlations (p<0.01) between cases and at-risk populations. Significant (p<0.001) spatio-temporal clustering of cases occurred throughout the epidemics, pointing towards a defined source. Significant directional epidemic spread was detected along water flow gradient (206.6°) in 2004/5 and against flow gradient (20.4°) in 2010. Temporal distributions showed clustered pulsed epidemic waves.ConclusionThese findings suggest mixed point-source propagated pattern of epidemic spread amongst hippos and points to likelihood of indirect spread of anthrax spores between hippos mediated by their social behaviour, forces of water flow, and persistent presence of infectious carcasses amidst schools. This information sheds light on the epidemiology of anthrax in highly social wildlife, can help drive insight into disease control, wildlife conservation, and tourism management, but highlights the need for analytical and longitudinal studies aimed at clarifying the hypotheses.

The Dilemna On Reconceptualizing Natural Resources In Campfire Areas In Zimbabwe

Zimbabwe is indisputably one of the foremost, volatile and vulnerable nations tainted with adverse impacts of the land degradation, poor governance of natural resources, unnecessary burning of the veld and poaching. Hence, there is the need to revisit sustainable environmental management policies and conservation initiatives starting from grassroots level. The CAMPFIRE program in Zimbabwe is one of the strategies designed to tackle environmental management. The conceptual connection of people and conservation of natural resources in Zimbabwe seemed to have evolved towards local ownership and local management. Thus limits of community ownership over natural resources have been reached. According to dominant actors on the conservation scene, the indigenous people in Zimbabwe have not been able to effectively conserve their wildlife and biodiversity and thus in their view a more enforcing style of conservation, separated from local people, is needed again. This study explores and analyses the benefits of conservation and sustainable management of natural resources including wildlife on rural livelihoods with particular focus on rural development. The methods used in this study included focus group discussions, key informant interviews and field observations.

Prairie dogs and wildfires shape vegetation structure in a sagebrush grassland more than does rest from ungulate grazing

AbstractUnderstanding drivers of vegetation structure has direct implications for wildlife conservation and livestock management, but the relative importance of multiple disturbances interacting within the same system to shape vegetation structure remains unclear. We investigated the separate and interactive effects of multiple disturbance drivers on vegetation structure through a three‐tiered, large‐scale manipulative experiment in northeast Wyoming, USA. We used nested grazing exclosures to isolate the effects of herbivory from livestock, wild ungulates, or small mammals within areas affected by either historical wildfire, black‐tailed prairie dog (Cynomys ludovicianus) colonies, or neither disturbance. We analyzed the interactive effects of disturbance history and contemporary herbivory by either small mammals alone, small mammals + native ungulates, or small mammals + native ungulates + livestock on vegetation structure by quantifying vegetation height, visual obstruction, shrub density, shrub canopy, and shrub leader growth. The exclusion of wild ungulates and lightly to moderately stocked livestock for two years did not significantly affect herbaceous vegetation structure, shrub density, or shrub canopy cover. Maximum vegetation height, visual obstruction, and heights of grasses and forbs were ~50% lower on black‐tailed prairie dog colonies than in undisturbed areas. Prairie dog colonies contained 71% lower shrub densities than undisturbed sites. Sites with wildfire or black‐tailed prairie dogs had 89% lower canopy cover of shrubs and Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis), when compared to undisturbed sites. Shrub leaders experienced over 4.5 times more browsing on prairie dog colonies, when compared to undisturbed areas. For most metrics, disturbance history did not modify the effects of contemporary herbivory on vegetation structure. However, shrubs on prairie dog colonies experienced significantly more leader browsing in the combined presence of livestock, native ungulates, and small mammals than in treatments where livestock were excluded. Our research has direct implications for wildlife conservation and rangeland management by demonstrating that short‐term (1–2 yr) rest from large ungulate grazing may not substantially alter vegetation structure in this system. Instead, structural variation is strongly driven by black‐tailed prairie dog colonization and historical wildfire. Understanding and managing multiple, potentially interacting disturbances is critical for maximizing wildlife conservation and livestock production in heterogeneous landscapes.

Structural composition and distribution of tree species of Dudhpukuria-Dhopachori Wildlife Sanctuary, Chittagong, Bangladesh

Structural composition based on diameter and height class distribution of the tree species of Dudhpukuria-Dhopachori Wildlife Sanctuary, Chittagong, Bangladesh was assessed. A total of 183 tree species having ≥ 10 DBH belonging to 125 genera and 48 families was recorded from the study area. Different species were found to dominate in different DBH classes, i.e. Aporosa wallichii (4.06%), Artocarpus chama (1.54%) and Dillenia pentagyna (0.38%) dominated 10 - &lt; 25 cm, 25 - &lt; 40 cm and 40 - &lt; 55 cm DBH, respectively. Swintonia floribunda was found in maximum (7 out of 8) number of DBH classes. Both the percentage of tree individuals (73.18%) and number of species (169) were highest in 10-24.5cm DBH range. Similarly, Dipterocarpus turbinatus (14.5-24.4m and 24.5-34.4m) and Swintonia floribunda (34.5-44.4m and 44.5-54.4m) were dominant in two height ranges each. On the other hand, height range 4.5 - 14.4 m was dominated by Aporosa wallichii (4.36%). Dipterocarpus costatus, Artocarpus chama, Syzygium firmum and Bombax insigne were found in all the height classes. Both the number of tree species and number of individual stems (167 species; 1,684 individuals) were highest in the height range of 4.5-14.4m. The number of species and tree individuals decreased linearly with increasing height. All these indicate that, there was a sustainable natural regeneration and successful recruitment of Aporosa wallichii, Dipterocarpus turbinatus, Lithocarpus acuminata, Grewia nervosa and Artocarpus chama in Dudhpukuria-Dhopachori Wildlife Sanctuary. Dipterocarpus turbinatus was found as dominant species as it constitures maximum (5.56%) percentage of all tree individuals. The findings of the study may be useful for protection, conservation and sustainable management of Dudhpukuria-Dhopachori Wildlife Sanctuary.J. Biodivers. Conserv. Bioresour. Manag. 2017, 3(1): 17-30

Long-term avian response to fire severity, repeated burning, and mechanical fuel reduction in upland hardwood forest

Forest restoration, fuel reduction, and wildlife conservation management requires understanding if, and how repeated prescribed fire, fire severity, or mechanical methods can promote goals. We examined breeding bird response to repeated fuel reduction treatments by mechanical understory reduction (twice; Mechanical-only), prescribed burning (four times; Burn-only), or mechanical understory reduction plus burning (then three subsequent burns; Mechanical + Burn). Initial burns were hotter in Mechanical + Burn than Burn-only resulting in heavy tree mortality, canopy openness, thick shrub density, and abundant snags lasting several years. Relative density and species richness of birds increased in Mechanical + Burn within three breeding seasons of high-severity burns, and remained greater throughout subsequent burns. Increases were due to an influx of species associated with young forest conditions, with little change in most mature forest species. Repeated burning in Mechanical + Burn likely impeded forest maturation, allowing many scrub-shrub bird species to persist. Species richness in Burn-only did not differ from any treatment, but modest increases over time were apparent as structural heterogeneity increased with delayed tree mortality. Cavity-nester density was highest in Mechanical + Burn, but remained high even as snags fell to pretreatment levels. Ground-nester density was lower in Mechanical + Burn than Control and Mechanical-only, but ground-nesting species responded differently. Open woodlands were not created by any treatment due to persistent re-sprouting of top-killed trees and shrubs. We note that breeding birds appear to respond similarly to high-severity burns and silvicultural treatments with heavy canopy reduction, offering possible alternatives in managing upland hardwood forests for diverse breeding bird communities.

Visitors’ motivation and willingness to pay for conservation in selected zoos in southwest Nigeria

The motivation and willingness to pay for ecotourism and wildlife conservation at the University of Ibadan and Obafemi Awolowo University Zoos in Southwest Nigeria were investigated. Structured Questionnaire was used to elicit information from two hundred and forty (240) visitor and data were analysed using descriptive and inferential (Chi-Square, Correlation) statistics. Findings from this study show that 50.4% of the visitors were female, 37.9% and 37.1% were within the age range of 15-24 years and 25-54 years respectively, 46.7% were married, and 43.3% attained to tertiary level of education. Furthermore, 66.2% of the visitors were employed with 39.6% earning ₦81, 000 (265.57 USD) and above as their monthly income. The main motivations of the zoo visitors are to see the condition of habitat and diversity of wildlife at the zoos, proximity to their residence and viewing wild animals. The starting bid for visitors to the zoos shows their willingness to pay for conservation services at the zoos. Income (r = 0.25, p = 0.00) had effect on the visitation pattern of the visitors. Relationship exists between the visitors’ motivation (r = 0.23, p = 0.00) and their level of satisfaction. The age (r = 0.15, p = 0.02), income (r = 0.13, p = 0.04), marital status (χ2 = 68.79, p = 0.01), religion (χ2 = 45.06, p = 0.04) of the visitors have impact on their willingness to pay for conservation at the zoos.Keywords: Zoo, Ecotourism, Wildlife conservation, and Wildlife management

テーマ別セッション「東北地方の野生鳥獣の保全と森林管理」を終えて

テーマ別セッション「東北地方の野生鳥獣の保全と森林管理」を終えて

English

Understanding the spatial distribution and habitat utilization by animals play a significant role in wildlife conservation and habitat management for the benefits of both animals and communities living close to protected areas. This study was conducted to identify the distribution and habitat use of Crocodilus niloticus in Tekeze River Dam through qualitative and quantitative surveys based on diurnal survey, semi-structured questionnaire and geographic information system (GIS) spatial analysis methods. The Tekeze River Dam representing the study area was divided into seven stratified river stratum. All spatial data were recorded and analyzed using ArcGIS 10 software. The distribution revealed that C. niloticus were registered along the main river stretch and its tributaries. Majority of C. niloticus prefer river banks, shallow water depth and rocky ground to perform their activity patterns. Along the 71.2 km&sup2; of the study area delineated for habitat preferences, 9.78 km2 was the highly suitable habitat while 4.63 km2 was the &nbsp;least suitable. The influence on communal resources, fishery activities and irrigation practice at small-scale on river banks and increment of water level due to flooding of the Tekeze River Dam were among the primary causes of disturbances induced by human to C. niloticus distribution and its habitats. The perception of most respondents to the conservation of this specie was not encouraging although their presence in the river was important in keeping the ecological balance of the ecosystem. It is therefore suggested that the success of conservation programs and habitats management should focus on educating the local community to raise awareness and change their attitudes towards promoting conservation development initiatives of C. niloticus in the area. &nbsp; Key words: Crocodilus niloticus, distribution, habitat preferences, Tekeze River Dam, threatened specie.

Genomic Epidemiology and Management of Salmonella in Island Ecosystems Used for Takahe Conservation.

Translocation and isolation of threatened wildlife in new environments may have unforeseen consequences on pathogen transmission and evolution in host populations. Disease threats associated with intensive conservation management of wildlife remain speculative without gaining an understanding of pathogen dynamics in meta-populations and how location attributes may determine pathogen prevalence. We determined the prevalence and population structure of an opportunistic pathogen, Salmonella, in geographically isolated translocated sub-populations of an endangered New Zealand flightless bird, the takahe (Porphyrio hochstetteri). Out of the nine sub-populations tested, Salmonella was only isolated from takahe living on one private island. The apparent prevalence of Salmonella in takahe on the private island was 32% (95% CI 13-57%), with two serotypes, Salmonella Mississippi and Salmonella houtenae 40:gt-, identified. Epidemiological investigation of reservoirs on the private island and another island occupied by takahe identified environmental and reptile sources of S. Mississippi and S. houtenae 40:gt- on the private island. Single nucleotide polymorphism analysis of core genomes revealed low-level diversity among isolates belonging to the same serotype and little differentiation according to host and environmental source. The pattern observed may be representative of transmission between sympatric hosts and environmental sources, the presence of a common unsampled source, and/or evidence of a recent introduction into the ecosystem. This study highlights how genomic epidemiology can be used to ascertain and understand disease dynamics to inform the management of disease threats in endangered wildlife populations.

Host Diet Affects the Morphology of Monarch Butterfly Parasites.

Understanding host-parasite interactions is essential for ecological research, wildlife conservation, and health management. While most studies focus on numerical traits of parasite groups, such as changes in parasite load, less focus is placed on the traits of individual parasites such as parasite size and shape (parasite morphology). Parasite morphology has significant effects on parasite fitness such as initial colonization of hosts, avoidance of host immune defenses, and the availability of resources for parasite replication. As such, understanding factors that affect parasite morphology is important in predicting the consequences of host-parasite interactions. Here, we studied how host diet affected the spore morphology of a protozoan parasite ( Ophryocystis elektroscirrha ), a specialist parasite of the monarch butterfly ( Danaus plexippus ). We found that different host plant species (milkweeds; Asclepias spp.) significantly affected parasite spore size. Previous studies have found that cardenolides, secondary chemicals in host plants of monarchs, can reduce parasite loads and increase the lifespan of infected butterflies. Adding to this benefit of high cardenolide milkweeds, we found that infected monarchs reared on milkweeds of higher cardenolide concentrations yielded smaller parasites, a potentially hidden characteristic of cardenolides that may have important implications for monarch-parasite interactions.

Supplementary feeding and endoparasites in threatened avian scavengers: Coprologic evidence from red kites in their wintering stronghold

Many obligate and facultative avian scavengers are increasingly dependent on food provided in supplementary feeding stations (SFS), which are managed for the conservation of these species. Deliberate feeding can influence disease-related host demography and population dynamics through physiological changes and density-dependent parasite acquisition and transmission, but information on this threat to avian scavengers is scarce. Due to their effects on host aggregation and density, we hypothesised that the predictability and concentration of food in SFS can exacerbate parasite infection. This hypothesis was tested by comparing the prevalence, richness, abundance and mixed infection of endoparasites (coccidia and helminths) in red kites Milvus milvus foraging on livestock carcasses (mostly of pigs and poultry) in overcrowded and confined conditions at SFS, relative to those foraging alone or in small groups on wild prey unevenly randomly distributed within large areas during winter, mostly wild rabbits (Oryctolagus cuniculus). No clear differences were found between areas with and without SFS in the prevalence and abundance of oocyst of Eimeria. This coccidian genus appears to include parasites of the prey rather than the raptors, thus representing parasite transport or pseudo-parasitism rather than actual parasitism in the kites. A higher prevalence and richness of helminths, as well as mixed infections with several phyla, was found in kites exploiting SFS than in those feeding on wild prey in the area without SFS. The unsanitary conditions derived from the stack of livestock carcasses and the contamination of carrion with the faeces of multiple scavenger hosts can increase the accumulation and persistence of helminths eggs and intermediate hosts. The regular use and frequent confinement of large numbers of red kites at SFS can promote the spread of parasites to a large proportion of the European breeding population distributed across Spain during the winter. We encourage that carcasses of free roaming livestock can be left in the countryside, as well as the conservation management of wildlife exploited as food by red kites (especially wild rabbits), to attempt avoiding overcrowded and confined conditions at SFS. Further research is required to assess the impact of deliberate feeding on the spread of parasites and other disease agents in the threatened species SFS are intended to favour.

WiseEye: Next Generation Expandable and Programmable Camera Trap Platform for Wildlife Research.

The widespread availability of relatively cheap, reliable and easy to use digital camera traps has led to their extensive use for wildlife research, monitoring and public outreach. Users of these units are, however, often frustrated by the limited options for controlling camera functions, the generation of large numbers of images, and the lack of flexibility to suit different research environments and questions. We describe the development of a user-customisable open source camera trap platform named ‘WiseEye’, designed to provide flexible camera trap technology for wildlife researchers. The novel platform is based on a Raspberry Pi single-board computer and compatible peripherals that allow the user to control its functions and performance. We introduce the concept of confirmatory sensing, in which the Passive Infrared triggering is confirmed through other modalities (i.e. radar, pixel change) to reduce the occurrence of false positives images. This concept, together with user-definable metadata, aided identification of spurious images and greatly reduced post-collection processing time. When tested against a commercial camera trap, WiseEye was found to reduce the incidence of false positive images and false negatives across a range of test conditions. WiseEye represents a step-change in camera trap functionality, greatly increasing the value of this technology for wildlife research and conservation management.

Strata-based forest fuel classification for wild fire hazard assessment using terrestrial LiDAR

Fuel structural characteristics affect fire behavior including fire intensity, spread rate, flame structure, and duration, therefore, quantifying forest fuel structure has significance in understanding fire behavior as well as providing information for fire management activities (e.g., planned burns, suppression, fuel hazard assessment, and fuel treatment). This paper presents a method of forest fuel strata classification with an integration between terrestrial light detection and ranging (LiDAR) data and geographic information system for automatically assessing forest fuel structural characteristics (e.g., fuel horizontal continuity and vertical arrangement). The accuracy of fuel description derived from terrestrial LiDAR scanning (TLS) data was assessed by field measured surface fuel depth and fuel percentage covers at distinct vertical layers. The comparison of TLS-derived depth and percentage cover at surface fuel layer with the field measurements produced root mean square error values of 1.1 cm and 5.4%, respectively. TLS-derived percentage cover explained 92% of the variation in percentage cover at all fuel layers of the entire dataset. The outcome indicated TLS-derived fuel characteristics are strongly consistent with field measured values. TLS can be used to efficiently and consistently classify forest vertical layers to provide more precise information for forest fuel hazard assessment and surface fuel load estimation in order to assist forest fuels management and fire-related operational activities. It can also be beneficial for mapping forest habitat, wildlife conservation, and ecosystem management.

Using trail cameras to estimate free‐ranging domestic cat abundance in urban areas

The domestic cat Felis catus is one of the most ecologically harmful invasive species on earth. Predation by free‐ranging cats poses a serious global threat to small vertebrates and is a leading source of anthropogenic mortality for birds and small mammals in North America. However, little is known about the size of cat populations, especially in urban areas where both cats and wildlife are abundant. Methods to quantify free‐ranging cat populations are needed to understand the magnitude of threats facing wildlife populations and to inform decisions about prioritizing conservation and cat population management. We assessed the utility of trail cameras and sight—resight analysis for estimating free‐ranging cat abundance in a small urban area (Stillwater, OK, USA). We also evaluated whether relationships exist between cat abundance and both urban development intensity and human population density. Even with relatively large cat populations, we identified the vast majority (∼96.5%) of individual cats in both day‐time and night‐time photos. We found no relationship between cat abundance and either urban development intensity or human population density. This finding combined with the large numbers of cats observed suggests that cats may be abundant in our study area regardless of urban context. Sampling freeranging cat populations across a broad range of urbanization intensities that capture a variety of human behaviors and/or cat management policies is needed to shed light on the drivers of cat population abundance. Trail cameras show promise as a highly useful tool for achieving this objective in the context of wildlife conservation management.

Jaguar Critical Habitat Designation Causes Concern for Southwestern Ranchers

On the Ground The designation of jaguar critical habitat in April 2014 in southern Arizona and southwestern New Mexico created concern for livestock ranchers in the region. We interviewed ranchers to understand their concerns with the jaguar critical habitat designation and their attitudes toward jaguars, wildlife conservation, and resource management in general. Ranchers we interviewed were concerned about direct impacts of designated critical habitat on ranching, as well as possible alternative agendas of critical habitat advocates and issues specific to the borderlands region. The ranchers were less concerned about the presence of jaguars but were more concerned about possible limiting effects of the Endangered Species Act (ESA), distrust of government entities, and litigious environmental groups. To maximize effectiveness, government agencies should work to foster trust in the ranching community, be cognizant of sensitive issues specific to the region that may challenge endangered species conservation...

Ivermectin treatment of free-ranging endangered Australian sea lion (Neophoca cinerea) pups: effect on hookworm and lice infection status, haematological parameters, growth, and survival.

A placebo-controlled study was used to investigate the effectiveness of ivermectin to treat hookworm (Uncinaria sanguinis) and lice (Antarctophthirus microchir) infections in free-ranging Australian sea lion (Neophoca cinerea) pups and to test the hypotheses that these parasitic infections cause anaemia, systemic inflammatory responses, and reduced growth, and contribute towards decreased pup survival. Ivermectin was identified as an effective and safe anthelmintic in this species. Pups administered ivermectin had significantly higher erythrocyte counts and significantly lower eosinophil counts compared to controls at 1-2months post-treatment, confirming that U. sanguinis and/or A. microchir are causatively associated with disease and demonstrating the positive effect of ivermectin treatment on clinical health parameters. Higher growth rates were not seen in ivermectin-treated pups and, unexpectedly, relatively older pups treated with ivermectin demonstrated significantly reduced growth rates when compared to matched saline-control pups. Differences in survival were not identified between treatment groups; however, this was attributed to the unexpectedly low mortality rate of recruited pups, likely due to the unintended recruitment bias towards pups >1-2months of age for which mortality due to hookworm infection is less likely. This finding highlights the logistical and practical challenges associated with treating pups of this species shortly after birth at a remote colony. This study informs the assessment of the use of anthelmintics as a tool for the conservation management of free-ranging wildlife and outlines essential steps to further the development of strategies to ensure the effective conservation of the Australian sea lion and its parasitic fauna.

Submodular Surrogates for Value of Information

How should we gather information to make effective decisions? A classical answer to this fundamental problem is given by the decision-theoretic value of information. Unfortunately, optimizing this objective is intractable, and myopic (greedy) approximations are known to perform poorly. In this paper, we introduce DiRECt, an efficient yet near-optimal algorithm for nonmyopically optimizing value of information. Crucially, DiRECt uses a novel surrogate objective that is: (1) aligned with the value of information problem (2) efficient to evaluate and (3) adaptive submodular. This latter property enables us to utilize an efficient greedy optimization while providing strong approximation guarantees. We demonstrate the utility of our approach on four diverse case-studies: touch-based robotic localization, comparison-based preference learning, wild-life conservation management, and preference elicitation in behavioral economics. In the first application, we demonstrate DiRECt in closed-loop on an actual robotic platform.

Modeling the potential distribution of sun bear in Krau wildlife reserve, Malaysia

Information and data on the distribution of wildlife species become important when strategizing the management and conservation of the species. Species distribution models have increasingly been used as a predictive tool in wildlife conservation planning and management. This research assessed the distribution of the sun bear and identified the relevant distribution descriptive variables in the Krau Wildlife Reserve, Pahang, Malaysia using Ecological Niche Factor Analysis (ENFA). Marginality and specialization factors showed that the sun bear habitat is very specific compared to the entire study area and its niche breadth was slightly narrow. Among all the habitat suitability algorithms available in Biomapper software package, median with the extreme optimum algorithm was found to have the best predictive capabilities by means of a continuous Boyce index. Results showed that sun bear can rarely be found in high altitudes, prefers lowland Dipterocarp, and avoids Mountain Ericaceous and Mixed Hill Dipterocarp forests. It also prefers to live nearby rivers, tends to avoid villages and prefers regions with fine silty-clay and loamy textures soils.