scholarly journals Reconciling Landscape Fragmentation and Hippopotamuses Population Decrease in Virunga National Park Wetland

2020 ◽  
Vol 08 (12) ◽  
pp. 63-76
Author(s):  
Madeleine Udahogora ◽  
Zhaoping Yang ◽  
Patient Mindje ◽  
Lamek Nahayo ◽  
Richard Mindje ◽  
...  
Rangifer ◽  
2011 ◽  
pp. 17-31 ◽  
Author(s):  
Maria L. Arlt ◽  
Micheline Manseau

In central Saskatchewan, boreal woodland caribou population declines have been documented in the 1940s and again in the 1980s. Although both declines led to a ban in sport hunting, a recovery was only seen in the 1950s and was attributed to wolf control and hunting closure. Recent studies suggest that this time, the population may not be increasing. In order to contribute to the conservation efforts, historical changes in caribou distribution and land cover types in the Prince Albert Greater Ecosystem (PAGE), Saskatchewan, were documented for the period of 1960s to the present. To examine changes in caribou distribution, survey observations, incidental sightings and telemetry data were collated. To quantify landscape changes, land cover maps were created for 1966 and 2006 using current and historic forest resources inventories, fire, logging, and roads data. Results indicate that woodland caribou are still found throughout the study area although their distribution has changed and their use of the National Park is greatly limited. Results of transition prob¬abilities and landscape composition analyses on the 1966 and 2006 land cover maps revealed an aging landscape for both the National Park and provincial crown land portions of the PAGE. In addition, increased logging and the development of extensive road and trail networks on provincial crown land produced significant landscape fragmentation for woodland caribou and reduced functional attributes of habitat patches. Understanding historical landscape changes will assist with ongoing provincial and federal recovery efforts for boreal caribou, forest management planning activities, and landscape restoration efforts within and beyond the Park boundaries.


2021 ◽  
Vol 11 (1) ◽  
pp. 79-84
Author(s):  
Filza Ade ◽  
◽  
Luchman Hakim ◽  
Estri Arumingtyas ◽  
Rodiyati Azrianingsih ◽  
...  

The wild population of Anaphalis spp. in Bromo Tengger Semeru National Park (BTNSP) has been reported decreased significantly. A combination of natural disturbance and anthropogenic factors contributes to the recent wild population decrease. A formulation of conservation strategy to ensure the sustainability of Anaphalis spp. require data and information related to external and internal factors determines the recent population in wild habitat. The objective of the paper was to identify factors related to conservation strategy of Anaphalis in BTSNP. This study found internal factor related to strength includes the existence of species and value of Anaphalisspp., while the weaknesses include increase of habitat degradation and disturbance caused by tourism activities. The opportunities for conservation include support of policy in biodiversity conservation and increase of ecotourism movement, while the threats aspect include less control of land uses changes and increase of mass tourism. The SWOT analyses recommends some significant strategy which are derived from combination of enhancing strength to optimizing opportunities, reducing weaknesses and optimizing opportunities, enhancing strength to reduce threats and managing weaknesses to manage risk.


2010 ◽  
Vol 56 (6) ◽  
pp. 660-669 ◽  
Author(s):  
Yosef Mamo ◽  
Michelle A. Pinard ◽  
Afework Bekele

Abstract We studied the population dynamics of endangered mountain nyala Tragelaphus buxtoni between 2003-2005 in the Bale Mountains National Park. Line-transect sampling and total count methods were used to gather data on demographics and movement patterns. The population's age-group composition was 58% adults, 25% sub-adults, 9% juveniles, 5% calves and 3% unidentified with a female-male sex ratio of 2:1. Population density was found to be significantly different between the two sub-populations (Dinsho Sanctuary and Gaysay/Adelay). A significant difference was found for age-group composition across the two sub-populations except adult females, sub-adult males and calves. The Dinsho sub-population was an isolated group. Separation and containment of the mountain nyala population could have negatively affected their ability to search for habitat requirements and mates from distant areas. The population varied between 830-908 individuals (95% CI), a reduction of 45% from earlier reports. However, the mean population density increased due to contraction of the species' habitat range. We observed a population decrease of 2%-5% per year over the course of our study. Many of the assessed demographic parameters did not significantly change over the three years. This suggests that the decrease in nyala population was not due to random variations in reproduction. Anthropogenic factors such as competition with livestock for forage, habitat encroachment and poaching by the local people might have been partly responsible for the depleted population in our study areas.


2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Cristiar Samosir, Tri Rima Setyawati, Ari Hepi Yanti

As the endemic fish of Danau Sentarum National Park, peam fish or Leptobarbus melanopterus had environmental problem such as overfishing due which threaten either juvenile or adult fish. These conditions were feared will led L. melanopterus population decrease in future if there is no sustainable management such as aquaculture. This research aims to identify the natural foods of L. melanopterus. Sixty four samples of L. melanopterus were collected through purposive sampling method. The results of gut analysis were found 17 genera of phytoplankton, 4 genera of zooplankton, 1 plant, and 1 Insecta. Zygnematophyceae had the most various genera which consisted of 7 genera while Ulvophyceae and Xanthophyceae only had 1 genera each of them. The natural food of L. melanopterus can be used as preliminary data for the application of aquaculture in the future.


Author(s):  
M. R. Edwards ◽  
J. D. Mainwaring

Although the general ultrastructure of Cyanidium caldarium, an acidophilic, thermophilic alga of questionable taxonomic rank, has been extensively studied (see review of literature in reference 1), some peculiar ultrastructural features of the chloroplast of this alga have not been noted by other investigators.Cells were collected and prepared for thin sections at the Yellowstone National Park and were also grown in laboratory cultures (45-52°C; pH 2-5). Fixation (glutaraldehyde-osmium), dehydration (ethanol), and embedding (Epon 812) were accomplished by standard methods. Replicas of frozenfracture d- etched cells were obtained in a Balzers apparatus. In addition, cells were examined after disruption in a French Press.


2011 ◽  
Author(s):  
Levi Zitting ◽  
Britton Mace ◽  
Grant Corser
Keyword(s):  

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