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Marco Cherin - One of the best experts on this subject based on the ideXlab platform.
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Acinonyx pardinensis carnivora felidae from the early pleistocene of pantalla italy predatory behavior and ecological role of the giant plio pleistocene cheetah
Quaternary Science Reviews, 2014Co-Authors: Marco Cherin, Raffaele Sardella, Dawid A. Iurino, Lorenzo RookAbstract:Abstract The site of Pantalla (central Italy) yielded a rich late Villafranchian (Early Pleistocene) faunal assemblage, which includes some well-preserved large mammal skulls. We describe here two nearly complete crania and a left hemimandible of Acinonyx pardinensis from this locality, representing the most complete cranial material of this species in Europe. These finds allowed us to define more clearly the craniodental morphology of A. pardinensis . Similarly to the forms from North Africa and China, the giant cheetah from Pantalla has a more generalized skull than the living Acinonyx jubatus , showing some primitive, pantherine-like features such as the less domed dorsal outline of the cranium, the more developed sagittal and nuchal crests and the less bowed zygomatic arches. High-resolution CT scans of the specimens were used to obtain the first 3D model of a cranium with articulated mandible of A. pardinensis . Starting from the insertion areas on this model we reconstructed the jaw muscles of the Pantalla felid, confirming its affinities with pantherine felines. In the light of the musculoskeletal skull anatomy and the average body mass (about 80 kg), it is likely that A. pardinensis could kill large prey through a hunting strategy more similar to pantherine cats than to the living cheetah.
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earliest occurrence of puma pardoides owen 1846 carnivora felidae at the plio pleistocene transition in western europe new evidence from the middle villafranchian assemblage of montopoli italy
Comptes Rendus Palevol, 2013Co-Authors: Marco Cherin, Dawid A. Iurino, Raffaele SardellaAbstract:Abstract The puma-like cat Puma pardoides (Owen, 1846) is reported from several Eurasian localities dated to the Late Pliocene–Early Pleistocene, but its Italian fossil record is really poor; in fact, the only possible occurrence comprises some fragmentary postcranial material from the Late Villafranchian locality of Pirro Nord (1.6–1.3 Ma). In the present paper, we describe an isolated left upper carnassial of a medium-sized felid belonging to the collection of fossil mammals from Montopoli (Tuscany, Italy), the type locality of the Middle Villafranchian Faunal Unit (∼2.6 Ma). All the morphological and morphometric characters of the tooth are consistent with an attribution to Puma pardoides (Owen, 1846), which comes out as the second felid species from Montopoli together with Acinonyx pardinensis (Croizet et Jobert, 1828) and is, possibly with the specimens from Perrier-Etouaries, the earliest occurrence in western Europe.
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Earliest occurrence of Puma pardoides (Owen, 1846) (Carnivora, Felidae) at the Plio/Pleistocene transition in western Europe: New evidence from the Middle Villafranchian assemblage of Montopoli, Italy
'Elsevier BV', 2013Co-Authors: Marco Cherin, Dawid A. Iurino, Raffaele SardellaAbstract:The puma-like cat Puma pardoides (Owen, 1846) is reported from several Eurasian localities dated to the Late Pliocene-Early Pleistocene, but its Italian fossil record is really poor; in fact, the only possible occurrence comprises some fragmentary postcranial material from the Late Villafranchian locality of Pirro Nord (1.6-1.3 Ma). In the present paper, we describe an isolated left upper carnassial of a medium-sized felid belonging to the collection of fossil mammals from Montopoli (Tuscany, Italy), the type locality of the Middle Villafranchian Faunal Unit (~2.6 Ma). All the morphological and morphometric characters of the tooth are consistent with an attribution to Puma pardoides (Owen, 1846), which comes out as the second felid species from Montopoli together with Acinonyx pardinensis (Croizet et Jobert, 1828) and is, possibly with the specimens from Perrier-étouaries, the earliest occurrence in western Europe. © 2013 Académie des sciences
Laurie Marker - One of the best experts on this subject based on the ideXlab platform.
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namibian farmland cheetahs Acinonyx jubatus demonstrate seronegativity for antibodies against bacillus anthracis
South African Journal of Wildlife Research, 2016Co-Authors: Linda Munson, Alexandra Switzer, Cari A Beesley, Patricia P Wilkins, Jason K Blackburn, Laurie MarkerAbstract:The cheetah (Acinonyx jubatus) is a vulnerable species, with estimates of only 6700 animals left in the wild. Namibia, an anthrax-endemic country, is home to the world's largest and most viable free-ranging population (~3000 animals), which predominantly resides on unprotected private farmlands (Durant, 2015). For over 170 years, anthrax has been reported in African wildlife species with sporadic outbreaks across Namibia (Beyer et al., 2012). Anthrax is regularly reported from zebra (Equus quagga), hartebeest (Alcelaphus buselaphus), springbok (Antidorcas marsupialis) and kudu (Tragelaphus strepsiceros) (Turner et al., 2014; Wafula, Patrick & Charles, 2007); all cheetah prey species. Anthrax epidemics occur annually in Namibia's Etosha National Park (ENP), whereas the establishment of a government mandated livestock vaccination programme in 1973 reduced the occurrence of anthrax on the surrounding farmlands (Bellanet al., 2012; Schneider, 1994; Turner et al., 2013). However, sporadic epidemics still occur on private farmlands throughout Namibia (Shaanika, 2013).
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improved quality of cryopreserved cheetah Acinonyx jubatus spermatozoa after centrifugation through accudenz
Journal of Andrology, 2009Co-Authors: Laurie Marker, Kimberly A Terrell, Adrienne E Crosier, J G Howard, Josephine N Henghali, Budhan S Pukazhenthi, David E WildtAbstract:Sperm cryopreservation, in combination with assist- ed reproductive techniques, is a valuable tool for the genetic management of endangered felids. However, the acrosome of the cheetah spermatozoon is especially sensitive to cryopreservation, with approximately 40% of spermatozoa experiencing acrosomal damage immediately after thawing and then another approximately 15% loss during the next 4 hours in vitro. Additionally, thawing causes a reduction in sperm motility by approximately 20% with another decrease of approximately 12% during subsequent incuba- tion in vitro. We hypothesized that slow removal of glycerol from cryopreserved cheetah spermatozoa using an Accudenz gradient would improve acrosomal integrity, sperm motility longevity, and structural morphology. Accudenz was compared with traditional cheetah sperm processing methods for glycerol removal that involves washing, multistep resuspension, and swim-up processing. Electroejaculates (n 5 21 total from 8 males) were washed in Ham F10 medium, and sperm pellets were resuspended in TEST-yolk buffer with 0% glycerol. Samples were cryopreserved in straws in 4% final glycerol, thawed, and assessed for percent intact acrosomes (% IA), percent motility (% M), and forward progressive status (FPS; scale, 0-5). Sperm motility index (SMI) was calculated as (% M + (FPS 6 20)) 4 2. In study 1, glycerol removal by centrifugation through an Accudenz gradient (4%, 10%) was compared with traditional sperm washing (control) and multistep resuspension protocols. At each time after centrifugation (hourly for 4 hours), % IA was improved (P , .05) for Accudenz (range, 36%-39%) compared with control (30%-33%) and multistep (29%-33%) treatments. In study 2, a modified Accudenz protocol was compared with traditional washing and was found to improve (P , .05) SMI (range, 52-64) compared with controls (range, 41-52) at each time postthaw after centrifugation. In study 3, swim-up processed sperm were compared with those treated by centrifugation through Accudenz and traditional sperm washing for improving sperm morphology. The percentage of structurally-normal sperm recovered postthawing increased (P , .05) for both the Accudenz (38%) and swim-up (33%) treatments compared with controls (21%). Percent IA and SMI also were improved (P , .05) for Accudenz (range, 39%- 47% and 46-59, respectively) compared with controls (range, 26%- 33% and 40-53, respectively). Results indicate that using Accudenz for glycerol removal from cryopreserved cheetah sperm mitigates the significant loss in sperm quality that occurs after freeze-thawing. This alleviation of cellular damage resulting from cryopreservation contributes to a more than 10% improvement in overall sperm motility and, more importantly, allows retention of 40% or more of sperm with intact acrosomes.
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molecular genetic insights on cheetah Acinonyx jubatus ecology and conservation in namibia
Journal of Heredity, 2008Co-Authors: Laurie Marker, Stephen J Obrien, Alison Pearks J Wilkerson, Ronald J Sarno, Janice S Martenson, Christian Breitenmoserwursten, Warren E. JohnsonAbstract:The extent and geographic patterns of molecular genetic diversity of the largest remaining free-ranging cheetah population were described in a survey of 313 individuals from throughout Namibia. Levels of relatedness, including paternity/maternity (parentage), were assessed across all individuals using 19 polymorphic microsatellite loci, and unrelated cheetahs (n 5 89) from 7 regions were genotyped at 38 loci to document broad geographical patterns. There was limited differentiation among regions, evidence that this is a generally panmictic population. Measures of genetic variation were similar among all regions and were comparable with Eastern African cheetah populations. Parentage analyses confirmed several observations based on field studies, including 21 of 23 previously hypothesized family groups, 40 probable parent/offspring pairs, and 8 sibling groups. These results also verified the successful integration and reproduction of several cheetahs following natural dispersal or translocation. Animals within social groups (family groups, male coalitions, or sibling groups) were generally related. Within the main study area, radio-collared female cheetahs were more closely interrelated than similarly compared males, a pattern consistent with greater male dispersal. The long-term maintenance of current patterns of genetic variation in Namibia depends on retaining habitat characteristics that promote natural dispersal and gene flow of cheetahs.
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comparison of helicobacter spp in cheetahs Acinonyx jubatus with and without gastritis
Journal of Clinical Microbiology, 2005Co-Authors: Karen A. Terio, Linda Munson, Laurie Marker, Brian Aldridge, Jay V SolnickAbstract:Chronic gastritis causes significant morbidity and mortality in captive cheetahs but is rare in wild cheetahs despite colonization by abundant spiral bacteria. This research aimed to identify the Helicobacter species that were associated with gastritis in captive cheetahs but are apparently commensal in wild cheetahs. Helicobacter species were characterized by PCR amplification and sequencing of the 16S rRNA, urease, and cagA genes and by transmission electron microscopy of frozen or formalin-fixed paraffin-embedded gastric samples from 33 cheetahs infected with Helicobacter organisms (10 wild without gastritis and 23 captive with gastritis). Samples were screened for mixed infections by denaturant gel gradient electrophoresis of the 16S rRNA gene and by transmission electron microscopy. There was no association between Helicobacter infection and the presence or severity of gastritis. Eight cheetahs had 16S rRNA sequences that were most similar (98 to 99%) to H. pylori. Twenty-five cheetahs had sequences that were most similar (97 to 99%) to “H. heilmannii” or H. felis .N o cheetahs had mixed infections. The ultrastructural morphology of all bacteria was most consistent with “H. heilmannii,” even when 16S rRNA sequences were H. pylori-like. The urease gene from H. pylori-like bacteria could not be amplified with primers for either “H. heilmannii” or H. pylori urease, suggesting that this bacteria is neither H. pylori nor “H. heilmannii.” The cagA gene was not identified in any case. These findings question a direct role for Helicobacter infection in the pathogenesis of gastritis and support the premise that host factors account for the differences in disease between captive and wild cheetah populations.
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serosurvey of viral infections in free ranging namibian cheetahs Acinonyx jubatus
Journal of Wildlife Diseases, 2004Co-Authors: Linda Munson, Laurie Marker, Edward J Dubovi, Jennifer A Spencer, James F Evermann, Stephen J ObrienAbstract:Cheetahs (Acinonyx jubatus) in captivity have unusually high morbidity and mortality from infectious diseases, a trait that could be an outcome of population homogeneity or the immunomodulating effects of chronic stress. Free-ranging Namibian cheetahs share ancestry with captive cheetahs, but their susceptibility to infectious diseases has not been investigated. The largest remaining population of free-ranging cheetahs resides on Namibian farmlands, where they share habitat with domestic dogs and cats known to carry viruses that affect cheetah health. To assess the extent to which free-ranging cheetahs are exposed to feline and canine viruses, sera from 81 free-ranging cheetahs sampled between 1992 and 1998 were evaluated for antibodies against canine distemper virus (CDV), feline coronavirus (feline infectious peritonitis virus; FCoV/FIPV), feline herpesvirus 1 (FHV1), feline panleukopenia virus (FPV), feline immunodeficiency virus (FIV), and feline calicivirus (FCV) and for feline leukemia virus (FeLV) ...
Raffaele Sardella - One of the best experts on this subject based on the ideXlab platform.
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Acinonyx pardinensis carnivora felidae from the early pleistocene of pantalla italy predatory behavior and ecological role of the giant plio pleistocene cheetah
Quaternary Science Reviews, 2014Co-Authors: Marco Cherin, Raffaele Sardella, Dawid A. Iurino, Lorenzo RookAbstract:Abstract The site of Pantalla (central Italy) yielded a rich late Villafranchian (Early Pleistocene) faunal assemblage, which includes some well-preserved large mammal skulls. We describe here two nearly complete crania and a left hemimandible of Acinonyx pardinensis from this locality, representing the most complete cranial material of this species in Europe. These finds allowed us to define more clearly the craniodental morphology of A. pardinensis . Similarly to the forms from North Africa and China, the giant cheetah from Pantalla has a more generalized skull than the living Acinonyx jubatus , showing some primitive, pantherine-like features such as the less domed dorsal outline of the cranium, the more developed sagittal and nuchal crests and the less bowed zygomatic arches. High-resolution CT scans of the specimens were used to obtain the first 3D model of a cranium with articulated mandible of A. pardinensis . Starting from the insertion areas on this model we reconstructed the jaw muscles of the Pantalla felid, confirming its affinities with pantherine felines. In the light of the musculoskeletal skull anatomy and the average body mass (about 80 kg), it is likely that A. pardinensis could kill large prey through a hunting strategy more similar to pantherine cats than to the living cheetah.
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earliest occurrence of puma pardoides owen 1846 carnivora felidae at the plio pleistocene transition in western europe new evidence from the middle villafranchian assemblage of montopoli italy
Comptes Rendus Palevol, 2013Co-Authors: Marco Cherin, Dawid A. Iurino, Raffaele SardellaAbstract:Abstract The puma-like cat Puma pardoides (Owen, 1846) is reported from several Eurasian localities dated to the Late Pliocene–Early Pleistocene, but its Italian fossil record is really poor; in fact, the only possible occurrence comprises some fragmentary postcranial material from the Late Villafranchian locality of Pirro Nord (1.6–1.3 Ma). In the present paper, we describe an isolated left upper carnassial of a medium-sized felid belonging to the collection of fossil mammals from Montopoli (Tuscany, Italy), the type locality of the Middle Villafranchian Faunal Unit (∼2.6 Ma). All the morphological and morphometric characters of the tooth are consistent with an attribution to Puma pardoides (Owen, 1846), which comes out as the second felid species from Montopoli together with Acinonyx pardinensis (Croizet et Jobert, 1828) and is, possibly with the specimens from Perrier-Etouaries, the earliest occurrence in western Europe.
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Earliest occurrence of Puma pardoides (Owen, 1846) (Carnivora, Felidae) at the Plio/Pleistocene transition in western Europe: New evidence from the Middle Villafranchian assemblage of Montopoli, Italy
'Elsevier BV', 2013Co-Authors: Marco Cherin, Dawid A. Iurino, Raffaele SardellaAbstract:The puma-like cat Puma pardoides (Owen, 1846) is reported from several Eurasian localities dated to the Late Pliocene-Early Pleistocene, but its Italian fossil record is really poor; in fact, the only possible occurrence comprises some fragmentary postcranial material from the Late Villafranchian locality of Pirro Nord (1.6-1.3 Ma). In the present paper, we describe an isolated left upper carnassial of a medium-sized felid belonging to the collection of fossil mammals from Montopoli (Tuscany, Italy), the type locality of the Middle Villafranchian Faunal Unit (~2.6 Ma). All the morphological and morphometric characters of the tooth are consistent with an attribution to Puma pardoides (Owen, 1846), which comes out as the second felid species from Montopoli together with Acinonyx pardinensis (Croizet et Jobert, 1828) and is, possibly with the specimens from Perrier-étouaries, the earliest occurrence in western Europe. © 2013 Académie des sciences
Dawid A. Iurino - One of the best experts on this subject based on the ideXlab platform.
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Acinonyx pardinensis carnivora felidae from the early pleistocene of pantalla italy predatory behavior and ecological role of the giant plio pleistocene cheetah
Quaternary Science Reviews, 2014Co-Authors: Marco Cherin, Raffaele Sardella, Dawid A. Iurino, Lorenzo RookAbstract:Abstract The site of Pantalla (central Italy) yielded a rich late Villafranchian (Early Pleistocene) faunal assemblage, which includes some well-preserved large mammal skulls. We describe here two nearly complete crania and a left hemimandible of Acinonyx pardinensis from this locality, representing the most complete cranial material of this species in Europe. These finds allowed us to define more clearly the craniodental morphology of A. pardinensis . Similarly to the forms from North Africa and China, the giant cheetah from Pantalla has a more generalized skull than the living Acinonyx jubatus , showing some primitive, pantherine-like features such as the less domed dorsal outline of the cranium, the more developed sagittal and nuchal crests and the less bowed zygomatic arches. High-resolution CT scans of the specimens were used to obtain the first 3D model of a cranium with articulated mandible of A. pardinensis . Starting from the insertion areas on this model we reconstructed the jaw muscles of the Pantalla felid, confirming its affinities with pantherine felines. In the light of the musculoskeletal skull anatomy and the average body mass (about 80 kg), it is likely that A. pardinensis could kill large prey through a hunting strategy more similar to pantherine cats than to the living cheetah.
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earliest occurrence of puma pardoides owen 1846 carnivora felidae at the plio pleistocene transition in western europe new evidence from the middle villafranchian assemblage of montopoli italy
Comptes Rendus Palevol, 2013Co-Authors: Marco Cherin, Dawid A. Iurino, Raffaele SardellaAbstract:Abstract The puma-like cat Puma pardoides (Owen, 1846) is reported from several Eurasian localities dated to the Late Pliocene–Early Pleistocene, but its Italian fossil record is really poor; in fact, the only possible occurrence comprises some fragmentary postcranial material from the Late Villafranchian locality of Pirro Nord (1.6–1.3 Ma). In the present paper, we describe an isolated left upper carnassial of a medium-sized felid belonging to the collection of fossil mammals from Montopoli (Tuscany, Italy), the type locality of the Middle Villafranchian Faunal Unit (∼2.6 Ma). All the morphological and morphometric characters of the tooth are consistent with an attribution to Puma pardoides (Owen, 1846), which comes out as the second felid species from Montopoli together with Acinonyx pardinensis (Croizet et Jobert, 1828) and is, possibly with the specimens from Perrier-Etouaries, the earliest occurrence in western Europe.
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Earliest occurrence of Puma pardoides (Owen, 1846) (Carnivora, Felidae) at the Plio/Pleistocene transition in western Europe: New evidence from the Middle Villafranchian assemblage of Montopoli, Italy
'Elsevier BV', 2013Co-Authors: Marco Cherin, Dawid A. Iurino, Raffaele SardellaAbstract:The puma-like cat Puma pardoides (Owen, 1846) is reported from several Eurasian localities dated to the Late Pliocene-Early Pleistocene, but its Italian fossil record is really poor; in fact, the only possible occurrence comprises some fragmentary postcranial material from the Late Villafranchian locality of Pirro Nord (1.6-1.3 Ma). In the present paper, we describe an isolated left upper carnassial of a medium-sized felid belonging to the collection of fossil mammals from Montopoli (Tuscany, Italy), the type locality of the Middle Villafranchian Faunal Unit (~2.6 Ma). All the morphological and morphometric characters of the tooth are consistent with an attribution to Puma pardoides (Owen, 1846), which comes out as the second felid species from Montopoli together with Acinonyx pardinensis (Croizet et Jobert, 1828) and is, possibly with the specimens from Perrier-étouaries, the earliest occurrence in western Europe. © 2013 Académie des sciences
J G Howard - One of the best experts on this subject based on the ideXlab platform.
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improved quality of cryopreserved cheetah Acinonyx jubatus spermatozoa after centrifugation through accudenz
Journal of Andrology, 2009Co-Authors: Laurie Marker, Kimberly A Terrell, Adrienne E Crosier, J G Howard, Josephine N Henghali, Budhan S Pukazhenthi, David E WildtAbstract:Sperm cryopreservation, in combination with assist- ed reproductive techniques, is a valuable tool for the genetic management of endangered felids. However, the acrosome of the cheetah spermatozoon is especially sensitive to cryopreservation, with approximately 40% of spermatozoa experiencing acrosomal damage immediately after thawing and then another approximately 15% loss during the next 4 hours in vitro. Additionally, thawing causes a reduction in sperm motility by approximately 20% with another decrease of approximately 12% during subsequent incuba- tion in vitro. We hypothesized that slow removal of glycerol from cryopreserved cheetah spermatozoa using an Accudenz gradient would improve acrosomal integrity, sperm motility longevity, and structural morphology. Accudenz was compared with traditional cheetah sperm processing methods for glycerol removal that involves washing, multistep resuspension, and swim-up processing. Electroejaculates (n 5 21 total from 8 males) were washed in Ham F10 medium, and sperm pellets were resuspended in TEST-yolk buffer with 0% glycerol. Samples were cryopreserved in straws in 4% final glycerol, thawed, and assessed for percent intact acrosomes (% IA), percent motility (% M), and forward progressive status (FPS; scale, 0-5). Sperm motility index (SMI) was calculated as (% M + (FPS 6 20)) 4 2. In study 1, glycerol removal by centrifugation through an Accudenz gradient (4%, 10%) was compared with traditional sperm washing (control) and multistep resuspension protocols. At each time after centrifugation (hourly for 4 hours), % IA was improved (P , .05) for Accudenz (range, 36%-39%) compared with control (30%-33%) and multistep (29%-33%) treatments. In study 2, a modified Accudenz protocol was compared with traditional washing and was found to improve (P , .05) SMI (range, 52-64) compared with controls (range, 41-52) at each time postthaw after centrifugation. In study 3, swim-up processed sperm were compared with those treated by centrifugation through Accudenz and traditional sperm washing for improving sperm morphology. The percentage of structurally-normal sperm recovered postthawing increased (P , .05) for both the Accudenz (38%) and swim-up (33%) treatments compared with controls (21%). Percent IA and SMI also were improved (P , .05) for Accudenz (range, 39%- 47% and 46-59, respectively) compared with controls (range, 26%- 33% and 40-53, respectively). Results indicate that using Accudenz for glycerol removal from cryopreserved cheetah sperm mitigates the significant loss in sperm quality that occurs after freeze-thawing. This alleviation of cellular damage resulting from cryopreservation contributes to a more than 10% improvement in overall sperm motility and, more importantly, allows retention of 40% or more of sperm with intact acrosomes.
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reproductive activity in captive female cheetahs Acinonyx jubatus assessed by faecal steroids
Reproduction, 1996Co-Authors: Janine L Brown, David E Wildt, Nadja Wielebnowski, K L Goodrowe, L H Graham, S Wells, J G HowardAbstract:Faecal oestradiol and progestogen metabolite excretion was monitored in adult, female cheetahs (Acinonyx jubatus) (n = 26) for 1-24 months. Increased faecal oestradiol excretion was associated with mating or equine chorionic gonadotrophin (eCG) administration for artificial insemination, whereas increased progestogen metabolites were observed during natural and human chorionic gonadotrophin (hCG)-induced pregnant and nonpregnant luteal phases. On the basis of oestradiol excretory patterns, duration of the oestrous cycle (mean +/- SEM) was 13.6 +/- 1.2 days with high oestradiol concentrations lasting for 4.1 +/- 0.8 days. In non-gonadotrophin-treated cheetahs, 75% showed evidence of oestrous cyclicity; however, none evaluated for 1 year or longer were continuously cyclic. Rather, cyclicity was interrupted by periods of anoestrus, often exceeding several months in duration. These inactive ovarian periods were unrelated to season and were not synchronous among females. Mean duration of gestation (breeding to parturition) was 94.2 +/- 0.5 days, whereas duration of faecal progestogen metabolite excretion during the nonpregnant luteal phase was 51.2 +/- 3.5 days. On the basis of progestogen metabolite evaluations, spontaneous ovulation (non-mating induced) occurred only once in two females (2 of 184 oestrous cycles; 1.1%). Peak eCG-stimulated, preovulatory oestradiol concentrations were similar to those associated with natural oestrus, whereas progestogen metabolite profiles after hCG resembled those during pregnant and nonpregnant luteal phases after natural mating. In summary, results confirm that the cheetah is polyoestrus and ovulation is almost always induced. However, new evidence suggests that many females inexplicably experience periods of anoestrus unrelated to season, while 25% of the cheetahs examined expressed no ovarian activity during the study period.
