Wildlife Biology最新文献_第8页

A hierarchical dependent double-observer method for estimating waterfowl breeding pairs abundance from helicopters 一种从直升机上估计水禽繁殖对丰度的分层相关双观测器方法

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-11-01 DOI: 10.1002/wlb3.01003

C. Roy, S. Gilliland, E. Reed

引用次数: 1

Seasonal variation in resource selection by subadult golden eagles in the Great Basin Desert 大盆地沙漠亚成年金雕资源选择的季节变化

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-11-01 DOI: 10.1002/wlb3.01002

Kathy M. Hixson, Steven J. Slater, Robert N. Knight, Robert C. Lonsinger

引用次数: 1

Migration chronology and movements of adult American black ducks Anas rubripes wintering in Nova Scotia, Canada 在加拿大新斯科舍省越冬的成年美洲黑鸭的迁徙年代学和迁徙

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-11-01 DOI: 10.1002/wlb3.01000

Liam E. Peck, M. English, G. Robertson, S. Craik, M. Mallory

引用次数: 2

Ecological factors influencing the selection of sett location by the Asian badger Meles leucurus 影响亚洲獾Meles leucurus选择栖息地的生态因素

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-10-27 DOI: 10.2981/wlb.00910

Ho-Kyoung Bae, Jae-Kang Lee, Tae-Kyung Eom, Dong-Ho Lee, Shin‐Jae Rhim

引用次数: 1

Chick survival and hunting are important drivers for the dynamics of two Alpine black grouse Lyrurus tetrix populations 雏鸡的生存和狩猎是两个高山黑松鸡种群动态的重要驱动因素

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-10-15 DOI: 10.2981/wlb.00874

L. Rotelli, R. Bionda, Niklaus Zbinden, M. Schaub

{"title":"Chick survival and hunting are important drivers for the dynamics of two Alpine black grouse Lyrurus tetrix populations","authors":"L. Rotelli, R. Bionda, Niklaus Zbinden, M. Schaub","doi":"10.2981/wlb.00874","DOIUrl":"https://doi.org/10.2981/wlb.00874","url":null,"abstract":"Alpine black grouse populations are generally declining, but the underlying demographic drivers are largely unknown. We studied the dynamics of two adjacent black grouse populations over a 20 years period in the Italian Alps that differ in hunting pressure to identify the main demographic process affecting these populations and to study the impact of hunting on males. We collected radio-tracking data and conducted population surveys in spring to count displaying cocks and in late summer to determine the breeding success by means of pointing dogs. These different data sets were jointly analysed using a seasonal integrated population model to estimate population sizes and various demographic rates. The two populations fluctuated in size and the number of males from one population increased after hunting intensity was reduced. The main demographic rates did not differ between the populations. Adult survival was relatively low and productivity was high, so the life history shows the feature of a fast turnover species. In both populations, the variability of survival from hatching to the age of five weeks (chick survival) contributed more to the variation of the population growth rates than the variability of survival in later life-history stages, and the former was positively affected by ambient temperatures in July, favouring chick survival. The adult sex ratio of the population where males hunting occurred was shifted towards females, but it evened over time with the reduction of hunting pressure. The adult sex ratio in the population without hunting and the chick sex ratios in both populations were even, suggesting that hunting acted as a mostly additive source of mortality.","PeriodicalId":54405,"journal":{"name":"Wildlife Biology","volume":"2021 1","pages":"wlb.00874"},"PeriodicalIF":1.9,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41714527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Habitat diversity influences puma Puma concolor diet in the Chihuahuan Desert 栖息地多样性对奇瓦瓦沙漠美洲狮饮食的影响

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-10-15 DOI: 10.2981/wlb.00875

Charles H. Prude, J. W. Cain

{"title":"Habitat diversity influences puma Puma concolor diet in the Chihuahuan Desert","authors":"Charles H. Prude, J. W. Cain","doi":"10.2981/wlb.00875","DOIUrl":"https://doi.org/10.2981/wlb.00875","url":null,"abstract":"Habitat heterogeneity and corresponding diversity in potential prey species should increase the diet breadth of generalist predators. Many previous studies describing puma Puma concolor diets in the arid regions of the southwestern United States were focused within largely xeric locations, overlooking the influence of heterogeneity created by riparian forests. Such habitat heterogeneity and corresponding prey diversity could influence prey availability and puma diet composition. We examined seasonal prey composition of pumas occupying areas with different habitat conditions representing riparian areas adjacent to the Rio Grande and xeric Chihuahuan Desert uplands in southern New Mexico. We collected prey composition data from 686 kill sites made by 17 (9 males and 8 females) GPS-collared pumas from 2014 to 2018. Diet composition included 32 different avian, aquatic, small mammal, and ungulate prey species. Prey composition varied, with more ungulate prey consumed by pumas inhabiting the upland desert areas and more aquatic prey consumed in the riparian bosque. Prey composition differed between seasons, with ungulate prey decreasing and aquatic prey increasing during the hot–dry season. Prey composition also varied between puma sex and habitat with females in the desert uplands consuming more small mammals than either males or females in riparian areas. The diverse diets of the pumas inhabiting the heterogeneous landscapes in southern New Mexico provide additional evidence that pumas have broad diets that are strongly influenced by the habitat and prey community that their home range encompasses.","PeriodicalId":54405,"journal":{"name":"Wildlife Biology","volume":"2021 1","pages":"wlb.00875"},"PeriodicalIF":1.9,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48842430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Bottom–up trophic effects on fisher Pekania pennanti harvest age structure: associations with mast, voles and owls 渔人蓬蓬鱼收获年龄结构的自下而上营养效应:与桅杆、田鼠和猫头鹰的关系

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-10-15 DOI: 10.2981/wlb.00873

J. Greenhorn, J. Bowman, S. Denomme-Brown, Danielle M. Ethier

{"title":"Bottom–up trophic effects on fisher Pekania pennanti harvest age structure: associations with mast, voles and owls","authors":"J. Greenhorn, J. Bowman, S. Denomme-Brown, Danielle M. Ethier","doi":"10.2981/wlb.00873","DOIUrl":"https://doi.org/10.2981/wlb.00873","url":null,"abstract":"Harvest management quotas for fishers Pekania pennanti in some jurisdictions are estimated from the previous year's harvest, and stem from the hypothesis that age ratios in the harvest are largely influenced by ‘top–down’ trapping pressure. The influence of ‘bottom–up’ food supply on fisher harvest age ratios might be underappreciated, which could result in a misallocation of quotas in management planning. We assessed a variety of data sources to test the influence of bottom–up processes on fisher populations in Ontario, Canada. We found evidence that bottom–up trophic effects influence the harvested fisher age structure in some regions of Ontario. Evidence also suggests that harvest pressure had little top–down influence on age ratios over the course of our study, and that basing management strategies on this assumption may lead to unintentional overharvest in years of low productivity. We suggest several trophic linkages with potential to facilitate fisher management, including connections among berry and seed crops, small mammals and northern saw-whet owls Aegolius acadicus.","PeriodicalId":54405,"journal":{"name":"Wildlife Biology","volume":"2021 1","pages":"wlb.00873"},"PeriodicalIF":1.9,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43385615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effectiveness of signs of activity as relative abundance indices for wild boar 活动标志作为野猪相对丰度指标的有效性

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-10-15 DOI: 10.2981/wlb.00869

D. Higashide, Takeo Kuriyama, S. Takagi, Yoshihiro Nakashima, K. Fukasawa, Gota Yajima, Minoru Kasada, M. Yokoyama

{"title":"Effectiveness of signs of activity as relative abundance indices for wild boar","authors":"D. Higashide, Takeo Kuriyama, S. Takagi, Yoshihiro Nakashima, K. Fukasawa, Gota Yajima, Minoru Kasada, M. Yokoyama","doi":"10.2981/wlb.00869","DOIUrl":"https://doi.org/10.2981/wlb.00869","url":null,"abstract":"Population growth in wild boars and feral pigs Sus scrofa has negative environmental and economic implications worldwide. Accordingly, it is necessary to monitor population trends for appropriate management. Despite the potential for bias, relative abundance indices based on signs of activity have the potential to be practical, low-cost monitoring tools for data collection at a local scale and over large areas. However, few studies have examined the effectiveness of specific signs as measures of relative wild boar abundance in comparison with reliable density estimates. In this study, we examined whether three activity signs (digging marks, rubbing marks and fecal pellet groups) could be used as relative abundance indices for wild boar. In particular, we conducted transect surveys for signs of activity as well as camera trap surveys from September 2017 to January 2018 at six sites in Hyogo Prefecture and eight sites in Chiba Prefecture, Japan. We modeled the relations between the number of activity signs and wild boar densities or abundances estimated from camera trap data in a hierarchical framework. Fecal pellet counts is a well-established method for estimating the abundance of herbivores, including wild boar; however, we found few fecal pellet groups in our study area, and the counts were not related to wild boar densities. Instead, we found that digging marks were strongly associated with estimates of wild boar density. Although fluctuations in the number of digging marks may be affected by factors other than boar density, including environmental conditions and seasonality, our results suggest that digging marks are an effective relative abundance index for evaluations of the spatial patterns of wild boar in Japan.","PeriodicalId":54405,"journal":{"name":"Wildlife Biology","volume":"2021 1","pages":"wlb.00869"},"PeriodicalIF":1.9,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47320732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Efficacy of attractants for detecting eastern spotted skunks: an experimental approach 引诱剂对东方斑点臭鼬的检测效果:一种实验方法

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-10-15 DOI: 10.2981/wlb.00880

Alexandra C. Avrin, C. Pekins, J. Sperry, Patrick J Wolff, M. L. Allen

{"title":"Efficacy of attractants for detecting eastern spotted skunks: an experimental approach","authors":"Alexandra C. Avrin, C. Pekins, J. Sperry, Patrick J Wolff, M. L. Allen","doi":"10.2981/wlb.00880","DOIUrl":"https://doi.org/10.2981/wlb.00880","url":null,"abstract":"Estimates of abundance and occupancy are essential for wildlife management, particularly for species of conservation concern such as eastern spotted skunks Spilogale putorius. Most studies of eastern spotted skunks rely on limited evidence for best monitoring practices, and while many studies use attractants to increase detections, previous studies have not tested attractants against a control of no attractant to determine their effectiveness. We tested two common attractants (sardines and fatty acid tablets) and one uncommon attractant (wild boar carcasses) against a control of no attractant to determine if any attractant increased detections of eastern spotted skunks or changed their temporal activity. Based on our model, sardines and wild boar carcasses improved detections by three and eight times that of the control, respectively. Further, for every 100 trap nights, we detected eastern spotted skunks 10.67 times with wild boar carcasses, 1.02 times with sardines, 0.53 times with fatty acid tablets and 0.44 times with no attractant. Wild boar carcasses also substantially decreased latency to detection, with skunks detected two times faster than at other attractants and almost three times faster than at the control. Eastern spotted skunks were most active in the early morning before sunrise, and their temporal activity did not vary significantly by attractant. This study is the first to use an experimental framework to test attractants for eastern spotted skunks, and our results showed that choice of attractant matters. Large animal carcasses, although rarely used, may be most effective for detecting eastern spotted skunks, while fatty acid tablets were no different than the control, and we recommend against their use in future studies. Monitoring plans should incorporate our results as increasing detections is essential to understanding the abundance, range and demographics of eastern spotted skunks.","PeriodicalId":54405,"journal":{"name":"Wildlife Biology","volume":"2021 1","pages":"wlb.00880"},"PeriodicalIF":1.9,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69566730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Applying the double observer methodology for assessing blue sheep population size in Nar Phu valley, Annapurna Conservation Area, Nepal 应用双观察者方法评估尼泊尔安纳普尔纳保护区纳普山谷蓝羊种群规模

IF 1.9 3区生物学

Wildlife Biology Pub Date : 2021-10-15 DOI: 10.2981/wlb.00877

K. Thapa, Rodney Jackson, Lal P. Gurung, Haridas Acharya, R. Gurung

{"title":"Applying the double observer methodology for assessing blue sheep population size in Nar Phu valley, Annapurna Conservation Area, Nepal","authors":"K. Thapa, Rodney Jackson, Lal P. Gurung, Haridas Acharya, R. Gurung","doi":"10.2981/wlb.00877","DOIUrl":"https://doi.org/10.2981/wlb.00877","url":null,"abstract":"This study was undertaken in spring, 2019 to assess the applicability of the double-observer survey method for estimating blue sheep Pseudois nayaur abundance in Nar-Phu valley of Manang District located in Annapurna Conservation Area of northern Nepal. Since counting large mammals in rugged mountain habitat poses a special challenge, we tested the efficacy of the double observer method for generating robust population estimates for this important protected area. The overall detection probability for observers (O1 and O2) was 0.94 and 0.91 for a total of 106 groups comprised of 2059 individual blue sheep. We estimated the area's blue sheep population at 2070 (SE ± 168.77; 95% CI 2059–2405) for the 246.2 km2 of sampled habitat. We determined blue sheep to be widely distributed within the study area with a mean density of 8.4 individuals per km2 based on a total study area of 246.2 km2. We discuss demographic population structure and identify limitations when applying the double observer approach, along with recommending viewshed mapping for ensuring more robust density estimates of mountain-dwelling ungulates like blue sheep or ibex that inhabit extremely heterogeneous terrain which strongly influences sighting distances and overall animal detection rates.","PeriodicalId":54405,"journal":{"name":"Wildlife Biology","volume":"2021 1","pages":"wlb.00877"},"PeriodicalIF":1.9,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46866813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3