Study of effects of selective hunting on a bear population through pva simulation

Download

index.pdf

Date

2008

Author

Ağzıtemiz, Mehmet Melih

Metadata

Show full item record

Item Usage Stats

210
views

95
downloads

Management of big wildlife such as bears can be a difficult task, especially in the face of human-wildlife conflict and demands of the hunting industry. The Brown Bear (Ursus arctos) population at Yusufeli County (Artvin, northeastern Turkey) has recently been the focus of scientific, social and economic concerns. This study population of c. 140 individuals occurs within 800 km2 of forested and alpine land. Legal hunting of male bears was allowed in 2007 after an interval of four years. This study aims to find out through a population viability analysis the level and frequency of trophy hunting this population can tolerate for the next 50 years. A matrix model with six age-classes for each sex was constructed using observed and literature-based parameter values. RAMAS Metapop was used to simulate four different scenarios where numbers of hunted bears and hunting frequency changes. The model was highly sensitive to maximum growth rate and adult survival. Interval extinction probabilities for the next 50 years ranged between 0% and 26% depending on the scenario. Viable scenarios (with an extinction probability < 0.05) were only possible with either no trophy hunting or hunting of 4 subadult/adult males and 1 adult female every other year. Legal and illegal hunting jointly impact the bear population in a strong way, and when they occur simultaneously every year, they lead to extinction in the long run. Avoidance of illegal killing and a close supervision of trophy hunting are crucial in the management of this bear population.

Subject Keywords

Biology., General and Animal Ecology.

URI

http://etd.lib.metu.edu.tr/upload/12610026/index.pdf
https://hdl.handle.net/11511/18157

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Conflicts between humans and wolf : a study Bozdağ, Konya province, Turkey Tuğ, Senem; Bilgin, Cemal Can; Department of Biology (2005) Canis lupus is one of the most important but least studied species of Turkish fauna, however, livestock depredation and recently increased number of publications on attacks on humans intensifies human-wildlife conflict. In this study, wolf depredation is studied in Bozdağ in the province of Konya where conflicts between wolves and livestock holders are well known. The study site holds >50,000 sheep and covers 9 villages and a small town. A total of 13 shepherds are interviewed in 2004 and 2005 to reveal hus...
Dissolved inorganic nitrogen removal efficiency of the reed beds surrounding lake Mogan using modeling approaches Gökmen, Mustafa; Beklioğlu, Meryem; Department of Biology (2004) In this study, yearly and seasonally nitrogen retention dynamics of reed beds surrounding Lake Mogan were investigated by comparing surface aerial nitrogen load and in-lake concentrations. The analyses were performed separately for nitrate-N, ammonium-N and dissolved inorganic nitrogen (sum of nitrate-N and ammonium-N) to reveal differences between them in terms of retention dynamics. 1998, 1999 and 2002 were relatively high-load years in terms of DIN-input to reed beds surrounding Lake Mogan, compared with...
Effects of landscape, land use and vegetation on bird community composition and diversity in Inner Anatolian steppes Ambarlı, Didem; Bilgin, Cemal Can (Elsevier BV, 2014-01-01) We present here the first systematic study on drivers of bird community composition and diversity in Anatolian steppes (Turkey), an environment important for populations of threatened grassland birds yet underrepresented in conservation networks. We focused on one million hectares of mountainous land with a long and varied land use history, and collected quantitative data on breeding birds as well as environmental, vegetation, landscape and land use parameters at 32 sites. Data were analyzed by canonical co...
IMPACT OF LARGE SCALE DAM CONSTRUCTION ON MOVEMENT CORRIDORS OF MAMMALS IN ARTVIN, NORTH-EASTERN TURKEY Ozdemirel, Kaya B.; Turak, Ayşe Suzan; Bilgin, Cemal Can (2016-01-01) The long term viability of many animals depends on maintaining connection between their subpopulations. However, man-made infrastructures can severely damage the connection of subpopulations through fragmenting prime habitats. Our goal in this study is to investigate impact of a series of dam constructions on the potential movement corridors of the wild goat (Capra aegragus), Eurasian lynx (Lynx lynx), and the golden jackal (Canis aureus) in northeastern Turkey. We used one of the most common approaches, le...
The Role of Top-Down and Bottom-Up Control for Phytoplankton in a Subtropical Shallow Eutrophic Lake: Evidence Based on Long-Term Monitoring and Modeling Mao, Zhigang; Gu, Xiaohong; Cao, Yong; Zhang, Min; Zeng, Qingfei; Chen, Huihui; Shen, Ruijie; Jeppesen, Erik (Springer Science and Business Media LLC, 2020-02-03) Lake ecosystems are exposed to a range of anthropogenic pressures, particularly eutrophication, and in some cases also stocking and/or overfishing of top-predator fish species, all factors that have implications for the food web structure and which could lead to dominance of nuisance cyanobacteria. Restoration of degraded lakes demands insight into the relative role of top-down for bottom-up regulating forces. While knowledge about these forces in temperate lakes is extensive, comparatively little is known ...

Citation Formats

M. M. Ağzıtemiz, “Study of effects of selective hunting on a bear population through pva simulation,” M.S. - Master of Science, Middle East Technical University, 2008.