Evaluación de la calidad espermática epididimal en hipopótamos Hippopotamus amphibius (Artiodactyla: Hippopotamidae) ubicados en el Magdalena Medio, Colombia

Betancur, Giovanni Restrepo; Giraldo, Elizabeth Varela; Suarez, Alexandra Usuga

doi:10.21829/azm.2016.322943

Cited by 4 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The control operation is controversial as the hippos are still an attraction at the theme park that was made from Escobar's home. This has meant that although they pose a very real threat to people living along the river, culling is rare, and instead one male was castrated and flown back to Hacienda Nápoles by helicopter (Valderrama Vásquez 2012;Restrepo Betancur et al 2016). Currently, the population at Hacienda Nápoles still exists and females breed with young males that left the group and invaded stretches of the Magdalena River.…”

Section: The Hippopotamus Hippopotamus Amphibiusmentioning

confidence: 99%

South Africa as a Donor of Alien Animals

Measey

Robinson

Kruger

et al. 2020

Biological Invasions in South Africa

View full text Add to dashboard Cite

This review provides the first assessment of animal species that are native to South Africa and invasive elsewhere in the world. While around a twelfth of all naturalised plants in the world are native to South Africa, there are very few examples of South African native marine, terrestrial, or freshwater animals becoming invasive elsewhere. We provide a narrative of each of the 34 cases that we could find. Three of these species, the Common Waxbill, Estrilda astrild, the Mozambique Tilapia, Oreochromis mossambicus and the African Clawed Frog, Xenopus laevis, were widely traded, and introduced on several continents with invasive populations becoming the subject of substantial research. Most other species are poorly documented in the literature such that it is often not known whether South African populations are the source of invasions. These species demonstrate the same trend in pathways of animals entering South Africa, moving from deliberate to accidental through time. The role of mavericks, individuals whose deliberate actions wilfully facilitate invasions, is highlighted. While South Africa has acted as an important bridgehead for the invasions of forestry pests, crayfish, fish and amphibians on the continent, it is clearly not a major donor of animal invasions, but rather a recipient. This could be due to South African ecosystems being fundamentally more invasible, or South African fauna showing reduced invasiveness, though it is likely that substantial differences in historical pathways also played a crucial role.

show abstract

Section: The Hippopotamus Hippopotamus Amphibiusmentioning

confidence: 99%

South Africa as a Donor of Alien Animals

Measey

Robinson

Kruger

et al. 2020

Biological Invasions in South Africa

View full text Add to dashboard Cite

show abstract

“…In lieu of culling, surgical sterilization and containment were adopted as the primary management strategies to control hippos 14 . Male hippo sterilization began in 2011; however, to date only ten males have been treated, partly due to the costs and challenges associated with this procedure 15 . New efforts are exploring the use of chemical sterilization with GonaCon Immunocontraceptive Vaccine (NWRC, Fort Collins, Colorado, USA), which has been used to induce contraception in many mammalian species 16 , 17 .…”

Section: Introductionmentioning

confidence: 99%

Rapid population growth and high management costs have created a narrow window for control of introduced hippos in Colombia

Subalusky

Sethi

Anderson

et al. 2023

Sci Rep

View full text Add to dashboard Cite

The introduction of hippos into the wild in Colombia has been marked by their rapid population growth and widespread dispersal on the landscape, high financial costs of management, and conflicting social perspectives on their management and fate. Here we use population projection models to investigate the effectiveness and cost of management options under consideration for controlling introduced hippos. We estimate there are 91 hippos in the middle Magdalena River basin, Colombia, and the hippo population is growing at an estimated rate of 9.6% per year. At this rate, there will be 230 hippos by 2032 and over 1,000 by 2050. Applying the population control methods currently under consideration will cost at least 1–2 million USD to sufficiently decrease hippo population growth to achieve long-term removal, and depending on the management strategy selected, there may still be hippos on the landscape for 50–100 years. Delaying management actions for a single decade will increase minimum costs by a factor of 2.5, and some methods may become infeasible. Our approach illustrates the trade-offs inherent between cost and effort in managing introduced species, as well as the importance of acting quickly, especially when dealing with species with rapid population growth rates and potential for significant ecological and social impacts.

show abstract