Population trends of antelopes in Waza National Park (Cameroon) show escalating effects of poaching and livestock intrusion

2013 ◽  
pp. n/a-n/a ◽  
Author(s):  
Paul Scholte
Keyword(s):  
National Park ◽  
Population Trends

Abundance, Distribution and Population Trends of Hippopotamus in Gonarezhou National Park, Zimbabwe

2010 ◽  
Vol 40 (2) ◽  
pp. 149-157 ◽  
Author(s):  
Patience Zisadza ◽  
Edson Gandiwa ◽  
Hugo van der Westhuizen ◽  
Elsabe van der Westhuizen ◽  
Vimbainashe Bodzo
Keyword(s):  
National Park ◽  
Population Trends ◽  
Abundance Distribution

scholarly journals Notes on wild dog Lycaon pictus and lion Panthera leo population trends during a drought in the Kruger National Park

Koedoe ◽  
1995 ◽  
Vol 38 (1) ◽  
Author(s):  
M.G.L. Mills
Keyword(s):  
National Park ◽  
Kruger National Park ◽  
Population Trends ◽  
Adult Survival ◽  
Panthera Leo ◽  
Lycaon Pictus ◽  
Drought Period ◽  
In The Wild ◽  
High Predation ◽  
Wild Dog

Wild dog Lycaon pictus and lion Panthera leo populations in the Kruger National Park appeared to undergo an increase during a drought period in the early 1990s. Newly established packs, high adult survival and pup productivity contributed to an increase in the wild dog population and evidence for high predation success during the height of the drought is presented. An increase in the lion density between 1989 and 1993 on the northern basalt plains, as well as changes in the structure of the population, seem to be related to changes in prey populations, particularly to a decline in numbers and condition of buffalo Syncerus cafer.

scholarly journals Some aspects of the history and population ecology of the tsessebe damaliscus lunatus lunatus in the Kruger National Park

Koedoe ◽  
1977 ◽  
Vol 20 (1) ◽  
Author(s):  
S.C.J. Joubert ◽  
P.J.L. Bronkhorst
Keyword(s):  
Sex Ratio ◽  
Population Ecology ◽  
Age Structure ◽  
National Park ◽  
Kruger National Park ◽  
Population Trends ◽  
Social Organisation ◽  
Developmental History ◽  
The Social ◽  
History Of

The population trends and distribution of the tsessebe population of the Kruger National Park are evaluated in terms of the available data derived from records compiled in the developmental history of the Kruger National Park (KNP). The recent numerical status of the population is also given. A description of the habitats favoured by tsessebe in the KNP is presented as well as an analysis of the age structure and sex-ratio of the population. Aspects of the social organisation of tsessebe affecting the interpretation of the age structure and sex-ratio phenomena of the population, are also discussed.

The relationship bewteen rainfall , lion predation and population trends in African herbivores.

1995 ◽  
Vol 22 (1) ◽  
pp. 75 ◽  
Author(s):  
MGL Mills ◽  
HC Biggs ◽  
IJ Whyte
Keyword(s):  
Driving Force ◽  
National Park ◽  
Kruger National Park ◽  
Population Trends ◽  
The Other ◽  
Population Declines ◽  
Central District ◽  
The Relationship ◽  
African Herbivores

The relationship between rainfall, lion predation and population trends in African herbivores, with special emphasis on buffalo, wildebeest and zebra, was studied in the central district of the Kruger National Park between 1968 and 1992. The study commenced at the end of a dry cycle, and moved into a 10-year wet cycle that was followed by another 10-year dry cycle. Populations of the herbivores reacted differently to these cycles: those of wildebeest and zebra fluctuated inversely with rainfall, whereas those of buffalo and the other herbivores fluctuated directly with rainfall to a greater or lesser degree. The proprtions in which some species were represented in lion kill samples followed a similar trend, with wildebeest and zebra being more vulnerable in the wet cycle and buffalo and waterbuck being more vulnerable in the dry cycle. Simulations of the buffalo, wildebeest and zebra populations suggest that buffalo are more heavily influenced by predation during population declines than are the other two species, followed by wildebeest, with zebra experiencing the smallest influence. The driving force in the ecosystem, however, appeared to be rainfall.

scholarly journals Long-Term Monitoring of Amphibian Populations of a National Park in Northern Spain Reveals Negative Persisting Effects of Ranavirus, but Not Batrachochytrium dendrobatidis

2021 ◽  
Vol 8 ◽  
Author(s):  
Jaime Bosch ◽  
Amparo Mora-Cabello de Alba ◽  
Susana Marquínez ◽  
Stephen J. Price ◽  
Barbora Thumsová ◽  
...  
Keyword(s):  
National Parks ◽  
National Park ◽  
Batrachochytrium Dendrobatidis ◽  
Disease Outbreaks ◽  
Population Level ◽  
Population Trends ◽  
Emerging Pathogens ◽  
Northern Spain ◽  
Amphibian Chytrid Fungus

Amphibians are the most highly threatened vertebrates, and emerging pathogens are a serious threat to their conservation. Amphibian chytrid fungi and the viruses of the Ranavirus genus are causing disease outbreaks worldwide, including in protected areas such as National Parks. However, we lack information about their effect over amphibian populations in the long-term, and sometimes these mortality episodes are considered as transient events without serious consequences over longer time-spans. Here, we relate the occurrence of both pathogens with the population trends of 24 amphibian populations at 15 sites across a national Park in northern Spain over a 14-year period. Just one out 24 populations presents a positive population trend being free of both pathogens, while seven populations exposed to one or two pathogens experienced strong declines during the study period. The rest of the study populations (16) remain stable, and these tend to be of species that are not susceptible to the pathogen present or are free of pathogens. Our study is consistent with infectious diseases playing an important role in dictating amphibian population trends and emphasizes the need to adopt measures to control these pathogens in nature. We highlight that sites housing species carrying Ranavirus seems to have experienced more severe population-level effects compared to those with the amphibian chytrid fungus, and that ranaviruses could be just as, or more important, other more high-profile amphibian emerging pathogens.

Application of distance sampling to estimate population densities of large herbivores in Kruger National Park

2008 ◽  
Vol 35 (4) ◽  
pp. 371 ◽  
Author(s):  
J. M. Kruger ◽  
B. K. Reilly ◽  
I. J. Whyte
Keyword(s):  
National Park ◽  
Distance Sampling ◽  
Kruger National Park ◽  
Population Trends ◽  
Population Estimates ◽  
Line Transect ◽  
Large Herbivores ◽  
Sampling Intensity ◽  
Coefficients Of Variation ◽  
White Rhinoceros

Aerial surveys have been used in the Kruger National Park, South Africa, to count large ungulates since the late 1970s. After 1998, aerial line-transect sampling using fixed-wing aircraft and Distance analyses replaced the ‘total’ counting method. This paper investigates these methods and three sampling intensities for estimating the densities of nine large ungulate species in Kruger National Park. Estimates suitable for the detection of population trends and making management decisions were decided by examination of coefficients of variation (set <20%, a priori). Despite the likely violation of some key assumptions of Distance sampling methods, analyses gave population estimates with adequate coefficients of variation for monitoring trends in impala, giraffe, zebra, kudu, white rhinoceros, and elephant bull populations. Significant improvements in precision were obtained at higher sampling intensities for kudu, giraffe, bull elephants and white rhinoceros, but these species already had sufficiently precise population estimates for the detection of trends at the lowest sampling intensity (15%). The estimates for warthog, wildebeest and waterbuck populations were, however, insufficiently precise for assessing population trends. Increasing sampling intensity to 22% and higher did not significantly increase the precision of the Distance estimates for these species. Shortcomings in interpretation of the data caused by violations of critical assumptions of analyses are identified and discussed.

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