Biology Agriculture Aquaculture Horticulture Postharvest Forestry Geography Environment Health

Evaluation of Camera Trap Surveys for Estimation of Sika Deer Herd Composition

submitted by pallykario 1 year and 2 months ago
Camera trap method has been developed for monitoring wildlife, however, most studies using camera trap depend on baited camera sites to attract target wildlife. This is likely to bias estimates of population structure. We evaluated the use of non-baited camera trap for the estimation of herd composition of sika deer (Cervus nippon). Camera trap showed a distinct seasonal pattern in sex ratios (males/100 female), which remained lowest between May and October but increased in November. Sex ratios were influenced by the number of observed males, because the ratios were positively correlated with the number of males but not females. The number of males increased in autumn during rutting season. Fawns/100 female ratios showed a distinct seasonal pattern. Highest and lowest fawns/100 female ratios were obtained in November and May, respectively. The decrease of fawns/100 female ratios in May comparing with that in November may be because of the overwinter mortality of fawns. Camera trap method is superior in term of continuously conduct in long-term, collect reasonable seasonal patterns, automatically record large numbers of sample sizes and useful in all weather conditions.

Topic: Biology

Add your comment

Please Login or Signup to leave a comment

Related stories

Differences in the activity pattern of the wild boar Sus scrofa related to human disturbance
submitted by moksemgar 1 year and 9 months ago - Topic: Biology
Over the last century, human activity has caused significant changes to the activity patterns of many wildlife species. The wild boar is one species known to change its activity pattern with the intensity of human disturbance. We conducted camera trap surveys in two study sites, Shingo and Himuro, in Tochigi, central Japan. We investigated effects of two types of human disturbance on the activi...

An evaluation of distance sampling for large-scale gopher tortoise surveys in Georgia, USA
submitted by fontams 1 year and 5 months ago - Topic: Biology
Gopher tortoise, Gopherus polyphemus, populations are threatened by habitat loss across their range. Management and conservation of the species has been hindered by the lack of population monitoring data. Recent studies have demonstrated that line transect distance sampling (LTDS) is efficient for estimating population parameters for gopher tortoises, yet this method has not gained wide-spread ...

Body composition and net energy and protein requirements of Morada Nova lambs
submitted by vekosnoekowode 11 months ago - Topic: Biology
A comparative slaughter trial was conducted with 48 Morada Nova lambs to assess the net energy and protein requirements for growth and maintenance. The animals were non-castrated and 2 months of age, with initial body weights averaging 12.05±1.81kg (BW). Eight animals were slaughtered at the beginning of the trial as a reference group, in order to estimate initial empty body weight (EBW) and b...

Genomic-polygenic evaluation for ultrasound and weight traits in Angus–Brahman multibreed cattle with the Illumina3k chip
submitted by mokali 1 year and 3 months ago - Topic: Agriculture
The objectives of this study were to estimate the proportion of additive genetic and phenotypic variances explained by the SNP markers in the Illumina3K chip for 4 postweaning ultrasound carcass and weight traits, to compare rankings of calf predicted additive genetic values with 3 models, and to evaluate trends of calf predictions as Brahman fraction increased from 0 to Traits were postweaning...

Profiling of essential oils and polyphenolics of Salvia argentea and evaluation of its by-products antioxidant activity
submitted by sotesh 1 year and 3 months ago - Topic: Agriculture
The objective of this study was to examine the chemical composition of essential oils and polyphenolics and to evaluate the antioxidant capacity of S. argentea by-products. Fourty seven compounds, representing (90.13, 92.00%) of the total oil, were identified. The major components were showed to be viridiflorol (18.75, 26.93%), manool (6.15, 13.59%), α-thujone (7.30, 8.06%), p-cymene (4.17, 6....

Evaluation of alternative mosquito sampling methods for malaria vectors in Lowland South - East Zambia
submitted by lene253541 1 year and 3 months ago - Topic: Health
Sampling malaria vectors and measuring their biting density is of paramount importance for entomological surveys of malaria transmission. Human landing catch (HLC) has been traditionally regarded as a gold standard method for surveying human exposure to mosquito bites. However, due to the risk of human participant exposure to mosquito-borne parasites and viruses, a variety of alternative, expos...

Improving the detection of anthelmintic resistan Evaluation of faecal egg count reduction test procedures suitable for farm routines
submitted by dena 11 months ago - Topic: Biology
The faecal egg count reduction test (FECRT) is the main method of detection of anthelmintic resistance (AR) in nematodes of veterinary importance. However, although the FECRT is standardised, the diagnostic performance of this method has not been fully characterised. In this survey Monte Carlo routines were used to simulate the estimation of faecal egg count reduction (FECR) with several FECRT ...

Modelling and estimation of genotype by environment interactions for production traits in French dairy cattle
submitted by zaleono 1 year and 7 months ago - Topic: Biology
Genotype by environment interactions are currently ignored in national genetic evaluations of dairy cattle. However, this is often questioned, especially when environment or herd management is wide-ranging. The aimof this study was to assess genotype by environment interactions for production traits (milk, protein, fat yieldsand fat and protein contents) in French dairy cattle using an original...

Recommendations to improve wildlife exposure estimation for development of soil screening and cleanup values
submitted by sflonniry2 10 months ago - Topic: Environment
An integral component in the development of media-specific values for the ecological risk assessment of chemicals is the derivation of safe levels of exposure for wildlife. Though the derivation and subsequent application of these values can be used for screening purposes, there is a need to identify the threshold for effects when making remedial decisions during site-specific assessments. for ...

Performance of small cluster surveys and the clustered LQAS design to estimate local-level vaccination coverage in Mali
submitted by lors56idlir 1 year and 8 months ago - Topic: Health
Estimation of vaccination coverage at the local level is essential to identify communities that may require additional support. Cluster surveys can be used in resource-poor settings, when population figures are inaccurate. To be feasible, cluster samples need to be small, without losing robustness of results. The clustered LQAS (CLQAS) approach has been proposed as an alternative, as smaller sa...

A multiwavelength analysis of planetary nebulae in the Large Magellanic Cloud
submitted by majtobo 5 months ago - Topic: Geography
This paper examines, compares and plots optical, near- and mid-infrared (MIR) photometric data for 605 planetary nebulae (PNe) in the Large Magellanic Cloud (LMC). With the aid of multiwavelength surveys such as the Spitzer legacy programme Surveying the Agents of a Galaxy's Evolution, the Two Micron All Sky Survey and the Magellanic Cloud Photometric Survey, plots have been constructed to expo...