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https://www.readbyqxmd.com/read/28070283/spatial-and-temporal-avoidance-of-risk-within-a-large-carnivore-guild
#1
Egil Dröge, Scott Creel, Matthew S Becker, Jassiel M'soka
Within a large carnivore guild, subordinate competitors (African wild dog, Lycaon pictus, and cheetah, Acinonyx jubatus) might reduce the limiting effects of dominant competitors (lion, Panthera leo, and spotted hyena, Crocuta crocuta) by avoiding them in space, in time, or through patterns of prey selection. Understanding how these competitors cope with one other can inform strategies for their conservation. We tested how mechanisms of niche partitioning promote coexistence by quantifying patterns of prey selection and the use of space and time by all members of the large carnivore guild within Liuwa Plain National Park in western Zambia...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28043366/semen-cryopreservation-and-radical-reduction-capacity-of-seminal-fluid-in-captive-african-lion-panthera-leo
#2
I Luther, U Jakop, I Lueders, A Tordiffe, C Franz, J Schiller, A Kotze, K Müller
Optimizing cryopreservation protocols for nondomestic felids contributes to the successful development of assisted reproduction techniques and genetic resource banking. In this study, we describe a simple cryopreservation procedure for African lion (Panthera leo) ejaculates, which was tested with different packaging options and different sperm numbers per dose. By applying urethral catheterization and electroejaculation, 17 ejaculates with greater than 20% motile and greater than 5% progressively motile sperm were collected...
February 2017: Theriogenology
https://www.readbyqxmd.com/read/28043351/reproductive-analysis-of-male-and-female-captive-jaguars-panthera-onca-in-a-colombian-zoological-park
#3
Santiago Jimenez Gonzalez, Jo Gayle Howard, Janine Brown, Henry Grajales, Jorge Pinzón, Haydy Monsalve, María Angélica Moreno, Claudia Jimenez Escobar
A reproductive analysis of a captive group of jaguars (Panthera onca; n = 6) at the Santacruz Zoological Foundation in Cundinamarca, Colombia, was conducted by performing a longitudinal, noninvasive, hormonal analysis of estradiol and progestogens in females and of androgens in males. During four seasons, female jaguars confined in solitary were evaluated for ovarian activity and spontaneous ovulation, male jaguars for testicular activity. A second hormonal follow-up was conducted in the females after administration of gonadotropins...
February 2017: Theriogenology
https://www.readbyqxmd.com/read/28031792/migratory-herds-of-wildebeests-and-zebras-indirectly-affect-calf-survival-of-giraffes
#4
Derek E Lee, Bernard M Kissui, Yustina A Kiwango, Monica L Bond
In long-distance migratory systems, local fluctuations in the predator-prey ratio can exhibit extreme variability within a single year depending upon the seasonal location of migratory species. Such systems offer an opportunity to empirically investigate cyclic population density effects on short-term food web interactions by taking advantage of the large seasonal shifts in migratory prey biomass.We utilized a large-mammal predator-prey savanna food web to evaluate support for hypotheses relating to the indirect effects of "apparent competition" and "apparent mutualism" from migratory ungulate herds on survival of resident megaherbivore calves, mediated by their shared predator...
December 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/28012903/multiple-host-pathogens-in-domestic-hunting-dogs-in-nicaragua-s-bosaw%C3%A3-s-biosphere-reserve
#5
Christine V Fiorello, Mary H Straub, Laura M Schwartz, James Liu, Amanda Campbell, Alexa K Kownacki, Janet E Foley
Nicaragua's Bosawás Biosphere Reserve is a vast forested area inhabited largely by indigenous Mayangna and Miskitu people. Most Bosawás residents rely on subsistence hunting and swidden agriculture, and hunting dogs are important for finding and securing wild game. We investigated the health of hunting dogs in three communities differing in location, size, and economy. Dogs in all communities were nutritionally compromised and experienced a heavy burden of disease. Seroprevalence of canine distemper, canine parvovirus, Rickettsia rickettsii, and Leptospira spp...
December 21, 2016: Acta Tropica
https://www.readbyqxmd.com/read/27973584/implications-of-fine-grained-habitat-fragmentation-and-road-mortality-for-jaguar-conservation-in-the-atlantic-forest-brazil
#6
Laury Cullen, Jessica C Stanton, Fernando Lima, Alexandre Uezu, Miriam L L Perilli, H Reşit Akçakaya
Jaguar (Panthera onca) populations in the Upper Paraná River, in the Brazilian Atlantic Forest region, live in a landscape that includes highly fragmented areas as well as relatively intact ones. We developed a model of jaguar habitat suitability in this region, and based on this habitat model, we developed a spatially structured metapopulation model of the jaguar populations in this area to analyze their viability, the potential impact of road mortality on the populations' persistence, and the interaction between road mortality and habitat fragmentation...
2016: PloS One
https://www.readbyqxmd.com/read/27958641/towards-accurate-and-precise-estimates-of-lion-density
#7
Nicholas B Elliot, Arjun M Gopalaswamy
Reliable estimates of animal density are fundamental to our understanding of ecological processes and population dynamics. Furthermore, their accuracy is vital to conservation biology since wildlife authorities rely on these figures to make decisions. However, it is notoriously difficult to accurately estimate density for wide-ranging species such as carnivores that occur at low densities. In recent years, significant progress has been made in density estimation of Asian carnivores, but the methods have not been widely adapted to African carnivores...
December 13, 2016: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/27928654/using-certified-timber-extraction-to-benefit-jaguar-and-ecosystem-conservation
#8
REVIEW
John Polisar, Benoit de Thoisy, Damián I Rumiz, Fabricio Díaz Santos, Roan Balas McNab, Rony Garcia-Anleu, Gabriela Ponce-Santizo, Rosario Arispe, Claudia Venegas
The jaguar Panthera onca requires large areas of relatively intact habitats containing adequate amounts of prey to survive. Since a substantial portion of jaguar range occurs outside of strict protected areas, there is a need for economic incentives for habitat conservation, which carefully managed selective logging can provide. Forest Stewardship Council and Pan European Forest Council certifications intended to regulate wood extraction to maintain the ecological functions of forests require evidence of biodiversity and ecosystem conservation...
December 7, 2016: Ambio
https://www.readbyqxmd.com/read/27925009/characteristics-and-fertility-of-sumatran-tiger-spermatozoa-cryopreserved-with-different-sugars
#9
Ni Wayan Kurniani Karja, Mokhamad Fahrudin, Mohamad Agus Setiadi, Ligaya Ita Tumbelaka, Retno Sudarwati, Yohana Tri Hastuti, Bongot Huas Mulia, Ardyta Widianti, Keni Sultan, Tsukasa Terazono, Zhao Namula, Masayasu Taniguchi, Fuminori Tanihara, Tatsuya Takemoto, Kazuhiro Kikuchi, Yoko Sato, Takeshige Otoi
BACKGROUND: Cryopreservation of semen is one of the most important methods for the preservation of endangered tigers. OBJECTIVE: This study evaluated the effects of sugar supplementation on the cryosurvival of spermatozoa from Sumatran tigers (Panthera tigris sumatrae). MATERIALS AND METHODS: The post-thaw characteristics and fertility of spermatozoa cryopreserved with different sugars (glucose, lactose, and trehalose) were evaluated using heterologous in-vitro fertilisation with cat oocytes...
July 2016: Cryo Letters
https://www.readbyqxmd.com/read/27881765/improved-homeothermy-and-hypothermia-in-african-lions-during-gestation
#10
Paul D Trethowan, Tom Hart, Andrew J Loveridge, Anna Haw, Andrea Fuller, David W Macdonald
Mammals use endogenously produced heat to maintain a high and relatively constant core body temperature (Tb). How they regulate their Tb during reproduction might inform us as to what thermal conditions are necessary for optimal development of offspring. However, few studies have measured Tb in free-ranging animals for sufficient periods of time to encounter reproductive events. We measured Tb continuously in six free-ranging adult female African lions (Panthera leo) for approximately 1 year. Lions reduced the 24 h amplitude of Tb by about 25% during gestation and decreased mean 24 h Tb by 1...
November 2016: Biology Letters
https://www.readbyqxmd.com/read/27878881/beneficial-effect-of-extracellular-adenosine-5-triphosphate-treatment-on-the-indochinese-leopard-panthera-pardus-delacouri-sperm-quality-after-cryopreservation
#11
P Thuwanut, W Tipkantha, B Siriaroonrat, P Comizzoli, K Chatdarong
The Indochinese leopard (Panthera pardus delacouri) population, included in CITES Appendix I, has been declining for decades. Proper gamete preservation condition is critical for breeding programme management using artificial insemination or in vitro fertilization (IVF). The present study aimed at investigating the impact of post-thawing treatment of leopard semen with extracellular adenosine 5'-triphosphate (ATPe) on sperm quality (including morphological traits and ability to fertilize an oocyte). Semen from six adult male leopards was collected by electroejaculation (one ejaculation per cat)...
November 22, 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27853599/prey-depletion-as-a-threat-to-the-world-s-large-carnivores
#12
Christopher Wolf, William J Ripple
Large terrestrial carnivores are an ecologically important, charismatic and highly endangered group of species. Here, we assess the importance of prey depletion as a driver of large carnivore endangerment globally using lists of prey species for each large carnivore compiled from the literature. We consider spatial variation in prey endangerment, changes in endangerment over time and the causes of prey depletion, finding considerable evidence that loss of prey base is a major and wide-ranging threat among large carnivore species...
August 2016: Royal Society Open Science
https://www.readbyqxmd.com/read/27829977/behavioral-correlates-between-daily-activity-and-sociality-in-wild-and-captive-origin-african-lions
#13
Emma J Dunston, Jackie Abell, Rafael Freire
Study of behavioral correlations within and across populations has long been of interest to ethologists. An exploration of behavioral correlations between sociality and behavior of African lions (Panthera leo) was undertaken to examine if this approach is better able to reveal important aspects of lion behavior not easily discernible by looking at these behaviors separately. Resting behavior and received play interactions were correlated in 2 captive-origin prides and one wild pride, attributable to the involvement of cubs and sub-adults...
2016: Communicative & Integrative Biology
https://www.readbyqxmd.com/read/27812324/big-cat-coalitions-a-comparative-analysis-of-regional-brain-volumes-in-felidae
#14
Sharleen T Sakai, Bradley M Arsznov, Ani E Hristova, Elise J Yoon, Barbara L Lundrigan
Broad-based species comparisons across mammalian orders suggest a number of factors that might influence the evolution of large brains. However, the relationship between these factors and total and regional brain size remains unclear. This study investigated the relationship between relative brain size and regional brain volumes and sociality in 13 felid species in hopes of revealing relationships that are not detected in more inclusive comparative studies. In addition, a more detailed analysis was conducted of four focal species: lions (Panthera leo), leopards (Panthera pardus), cougars (Puma concolor), and cheetahs (Acinonyx jubatus)...
2016: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/27788055/diagnosis-and-implications-of-mycobacterium-bovis-infection-in-banded-mongooses-mungos-mungo-in-the-kruger-national-park-south-africa
#15
Angela C Brüns, Manfred Tanner, Mark C Williams, Louise Botha, Amanda O'Brien, Geoffrey T Fosgate, Paul D van Helden, John Clarke, Anita L Michel
Bovine tuberculosis (bTB) was first diagnosed in the Kruger National Park (KNP) in 1990. Research has since focused on the maintenance host, the African buffalo ( Syncerus caffer ) and clinically affected lion ( Panthera leo ). However, little is known about the role of small predators in tuberculosis epidemiology. During 2011-12, we screened banded mongooses ( Mungos mungo ) in the bTB high-prevalence zone of the KNP for Mycobacterium tuberculosis complex members. Fecal swabs, tracheal swabs, and tracheal lavages of 76 banded mongooses caught in cage traps within a 2-km radius of Skukuza Rest Camp were submitted for Mycobacterium culture, isolation, and species identification...
January 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/27786283/estimating-lion-abundance-using-n-mixture-models-for-social-species
#16
Jerrold L Belant, Florent Bled, Clay M Wilton, Robert Fyumagwa, Stanslaus B Mwampeta, Dean E Beyer
Declining populations of large carnivores worldwide, and the complexities of managing human-carnivore conflicts, require accurate population estimates of large carnivores to promote their long-term persistence through well-informed management We used N-mixture models to estimate lion (Panthera leo) abundance from call-in and track surveys in southeastern Serengeti National Park, Tanzania. Because of potential habituation to broadcasted calls and social behavior, we developed a hierarchical observation process within the N-mixture model conditioning lion detectability on their group response to call-ins and individual detection probabilities...
October 27, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27783697/under-the-skin-of-a-lion-unique-evidence-of-upper-paleolithic-exploitation-and-use-of-cave-lion-panthera-spelaea-from-the-lower-gallery-of-la-garma-spain
#17
Marián Cueto, Edgard Camarós, Pedro Castaños, Roberto Ontañón, Pablo Arias
Pleistocene skinning and exploitation of carnivore furs have been previously inferred from archaeological evidence. Nevertheless, the evidence of skinning and fur processing tends to be weak and the interpretations are not strongly sustained by the archaeological record. In the present paper, we analyze unique evidence of patterned anthropic modification and skeletal representation of fossil remains of cave lion (Panthera spelaea) from the Lower Gallery of La Garma (Cantabria, Spain). This site is one of the few that provides Pleistocene examples of lion exploitation by humans...
2016: PloS One
https://www.readbyqxmd.com/read/27783617/genetic-diversity-and-population-structure-of-mesoamerican-jaguars-panthera-onca-implications-for-conservation-and-management
#18
Claudia Wultsch, Anthony Caragiulo, Isabela Dias-Freedman, Howard Quigley, Salisa Rabinowitz, George Amato
Mesoamerican jaguars (Panthera onca) have been extirpated from over 77% of their historic range, inhabiting fragmented landscapes at potentially reduced population sizes. Maintaining and restoring genetic diversity and connectivity across human-altered landscapes has become a major conservation priority; nonetheless large-scale genetic monitoring of natural populations is rare. This is the first regional conservation genetic study of jaguars to primarily use fecal samples collected in the wild across five Mesoamerican countries: Belize, Costa Rica, Guatemala, Honduras, and Mexico...
2016: PloS One
https://www.readbyqxmd.com/read/27763827/serosurvey-for-selected-viral-pathogens-among-sympatric-species-of-the-african-large-predator-guild-in-northern-botswana
#19
Anne-Lise Chaber, Gabriele Cozzi, Femke Broekhuis, Robyn Hartley, John W McNutt
The recent increase in the creation of transboundary protected areas and wildlife corridors between them lends importance to information on pathogen prevalence and transmission among wildlife species that will become connected. One such initiative is the Kavango Zambezi Transfrontier Conservation Area of which Botswana's Okavango Delta constitutes a major contribution for wildlife and ecosystems. Between 2008 and 2011, we collected serum samples from 14 lions ( Panthera leo ), four leopards ( Panthera pardus ), 19 spotted hyenas ( Crocuta crocuta ), and six cheetahs ( Acinonyx jubatus ) in the Okavango...
January 2017: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/27734631/home-range-establishment-and-utilization-by-reintroduced-lions-panthera-leo-in-a-small-south-african-wildlife-reserve
#20
Sze-Wing Yiu, Francesca Parrini, Leszek Karczmarski, Mark Keith
Understanding of animal spatial behavior is essential for informed management decisions. In southern Africa, reintroduction of lions (Panthera leo) to small reserves (<1000 km(2) ) has increased in recent years but studies on their ranging behavior in these enclosed systems remain lacking. We applied Time Local Convex Hull (T-LoCoH) methods to study the home range establishment and utilization of 11 lions reintroduced to Dinokeng Game Reserve, South Africa, during 2011 through 2014. Lions established home ranges close to their release sites and during the following three years their home range sizes continued to increase, but in each individual case it remained smaller than half of the reserve area (< 70 km(2) )...
October 13, 2016: Integrative Zoology
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