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Torsten Wronski - One of the best experts on this subject based on the ideXlab platform.
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dark grey Gazelles gazella cetartiodactyla bovidae in arabia threatened species or domestic pet
Hystrix-italian Journal of Mammalogy, 2017Co-Authors: Torsten Wronski, Hannes Lerp, Eva Verena Baermann, Thomas M Butynski, Martin PlathAbstract:True Gazelles (genus Gazella) are a prime example of a mammalian group with considerable taxonomic confusion. This includes the descriptions of several dark grey taxa of questionable validity. Here, we examined captive dark grey putative Neumann’s gazelle Gazella erlangeri. Our concerted efforts to retrieve mitochondrial sequence information from old museum specimens of two dark grey Gazelles, putative G. erlangeri and putative Muscat gazelle G. muscatensis, were unsuccessful. We did, however, find the mtDNA haplotypes of extant putative G. erlangeri to be nested within the haplotype variation of the Arabian gazelle G. arabica. The observed population genetic divergence between G. arabica and putative G. erlangeri (based on 11 nuclear microsatellites) was driven by genetic impoverishment of putative G. erlangeri. These results, along with morphological signatures of domestication (e.g., reduced brain case size), suggest genetic bottle necks and domestication effects as a consequence of prolonged captive breeding. Three hypotheses are discussed: (a) G. erlangeri and/or G. muscatensis are valid species but are now extinct; (b) one or both taxa represent phenotypic variation within G. arabica and, therefore, are synonyms of G. arabica; and (c) captive stocks, exhibiting the effects of domestication and inbreeding, are the sources for the descriptions of G. erlangeri and G. muscatensis. As concerns the conservation of Gazelles, based on current knowledge, we strongly advise against using putative G. erlangeri for any introduction initiative but recommend the continued captive management of putative G. erlangeri.
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a morphometric and genetic framework for the genus gazella de blainville 1816 ruminantia bovidae with special focus on arabian and levantine mountain Gazelles
Zoological Journal of the Linnean Society, 2013Co-Authors: Torsten Wronski, Eva V. Bärmann, Saskia Börner, Dirk Erpenbeck, Gertrud E. Rössner, Hannes Lerp, Beatriz Azanza, Gert WörheideAbstract:Gazella is one of the most species-rich genera within horned ruminants. Despite overall similarity in body size and morphology, Gazelles show variability in coloration and horn morphology. Unfortunately, however, species differentiation based on these characters, or on discrete skull characters, is very difficult due to high intraspecific variability. Furthermore, most species have fragmented and allopatric distributions, so that species boundaries were hard to define in the past. Mitochondrial DNA sequences have proven useful for investigating gazelle taxonomy in recent years, but especially for old museum material, i.e. type specimens, destructive sampling is often impossible. We provide a comprehensive morphometric framework for the genus Gazella based on linear skull measurements reconciled with results from molecular phylogenetic analysis based on the largest dataset available so far. In particular for males, the skull morphology shows interspecific differences concurrent with DNA data and provides a reliable tool for species identification. Based on morphometric data we synonymize G. karamii with G. marica, and confirm the identification of the G. arabica and G. a. rueppelli type skulls from analyses of mitochondrial DNA sequences. © 2013 The Linnean Society of London
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cross infection with gastro intestinal tract parasites between domestic goat and endemic farasan gazelle gazella gazella farasani in farasan islands saudi arabia
Journal of King Saud University - Science, 2013Co-Authors: Ann Apio, Sawsan A. Omer, Osama B. Mohammed, Torsten WronskiAbstract:Abstract Host related variations in helminth egg and coccidian oocyst counts were compared between a naturally infected endemic population of Farasan gazelle and domestic goats on the Farasan Islands, Saudi Arabia in April 2009. Both bovid species inhabit and browse in the same area but no cross-infection could be detected. The prevalence and mean intensity quantified as the number of eggs and oocysts per gram of faeces were taken as a measure of parasite burdens. Host related differences in prevalence values of Eimeria spp. were significantly higher in domestic goats than in wild Gazelles. A similar trend was observed for nematode prevalence (strongyle-type eggs), with no infection in gazelle and low infection in goats. There was also a significant difference in mean intensity values between different Eimeria spp. found in domestic goats.
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population development of arabian Gazelles gazella arabica on the farasan islands saudi arabia mammalia bovidae
Zoology in The Middle East, 2013Co-Authors: Torsten WronskiAbstract:The population of the Arabian Gazelle (Gazella arabica) was assessed on Farasan Kebir, the main island of the Farasan Archipelago (Saudi Arabia), from June 2010 to January 2013, using road strip counts. Two methods of estimating the population size were applied to analyse data obtained from the road strip count: (i) the traditional technique after Bothma, with a fixed strip width, and (ii) distance sampling using DISTANCE 6.0. Estimates varied between 483 Gazelles (95% CI: 44) in November 2010 and 1070 Gazelles (95% CI: 63) in June 2010. The number of Gazelles estimated for Farasan Kebir using distance sampling is 2388 Gazelles (95% CI: 921) in December 2011, 1199 Gazelles (95% CI: 1372) in June 2012, and 1048 Gazelles (95% CI:1524) in January 2013. Taking into account previous counts (1988–2009) the population seems, despite considerable variations, surprisingly stable. This may be attributed to a prevailing fishing culture among local residents and thus the absence of traditional hunting as well as the ...
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size and sex matter reproductive biology and determinants of offspring survival in gazella marica
Biological Journal of The Linnean Society, 2013Co-Authors: Rudiger Riesch, Martin Plath, Hannes Lerp, Ryan Martin, Torsten WronskiAbstract:Environmental conditions should impact the optimal resolution of the trade-off between offspring size and offspring number, which has a major impact on female reproductive life histories. Using breeding data collected over 13 years at the King Khalid Wildlife Research Centre (KKWRC) in Saudi Arabia, we tested the hypothesis that larger sand gazelle (Gazella marica) offspring will have lower mortality than smaller-sized offspring; nonetheless, selection should still favour the production of larger litters (even at the cost of reduced offspring size) under favourable environmental conditions (and vice versa under poor environmental conditions). The present study provides evidence for an early fitness advantage of larger over smaller sand Gazelles because offspring that were heavier at birth had higher survival rates to weaning age (90 days) and sexual maturity (365 days) than lighter offspring; also, females had higher survival rates than males. Moreover, antagonistic selection on offspring and litter size is resolved in favour of maternal fitness early in the year (i.e. high propensity for twinning), although fitness optima converge later in the year when it becomes beneficial to both offspring and mothers to produce large singletons, highlighting temporal variation in the selective regimes affecting female reproductive life histories. © 2013 The Linnean Society of London, Biological Journal of the Linnean Society, 2013, 110, 116–127.
Osama B. Mohammed - One of the best experts on this subject based on the ideXlab platform.
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cross infection with gastro intestinal tract parasites between domestic goat and endemic farasan gazelle gazella gazella farasani in farasan islands saudi arabia
Journal of King Saud University - Science, 2013Co-Authors: Ann Apio, Sawsan A. Omer, Osama B. Mohammed, Torsten WronskiAbstract:Abstract Host related variations in helminth egg and coccidian oocyst counts were compared between a naturally infected endemic population of Farasan gazelle and domestic goats on the Farasan Islands, Saudi Arabia in April 2009. Both bovid species inhabit and browse in the same area but no cross-infection could be detected. The prevalence and mean intensity quantified as the number of eggs and oocysts per gram of faeces were taken as a measure of parasite burdens. Host related differences in prevalence values of Eimeria spp. were significantly higher in domestic goats than in wild Gazelles. A similar trend was observed for nematode prevalence (strongyle-type eggs), with no infection in gazelle and low infection in goats. There was also a significant difference in mean intensity values between different Eimeria spp. found in domestic goats.
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coagulation profile and platelet parameters of the arabian sand gazelle gazella subgutturosa marica comparison with humans and camels
Journal of Wildlife Diseases, 2010Co-Authors: Mansour F. Hussein, Osama B. Mohammed, Sawsan A. Omer, Riyadh S. Aljumaah, M. A. Alshaikh, Abdelgadir Homeida, A Alhaidary, A Gar R Elnabi, William MacaseroAbstract:During March 2009, we evaluated the hemostatic profile and platelet indices of 18 Arabian sand Gazelles (Gazella subgutturosa marica) and compared the results with those from humans and camels (Camelus dromedarius). Gazelles and camels had shorter activated partial thromboplastin times, lower proconvertin and higher antihemophilic factor coagulation activity, and plasma fibrinogen levels than humans. Prothrombin time was longer in sand Gazelles and shorter in camels than it was in humans. Plasma thromboplastin component, Stuart factor, and plasma thromboplastin antecedent were similar in Gazelles, humans, and camels, whereas the platelet count of the sand gazelle was significantly higher than it was for camels and humans.
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the efficacy of ivermectin and levamisole against natural nematodirus spathiger infection in the arabian sand gazelle gazella subgutturosa marica and the arabian mountain gazelle gazella gazella in saudi arabia
Veterinary Parasitology, 2007Co-Authors: Osama B. Mohammed, Sawsan A. Omer, Mohammed A. SandoukaAbstract:The efficacy of two broad spectrum anthelmintics (Ivermectin and Levamisole) against the nematode Nematodirus spathiger in the reem (Arabian sand gazelle) and idmi (Arabian mountain gazelle) at King Khalid Wildlife Research Centre (KKWRC) was determined. Gazelles of both species naturally infected with N. spathiger were each divided into 3 groups. One group was treated with Ivermectin, the other group with Levamisole and the last group was left as untreated control. Faecal egg counts were employed to determine the efficacy of the two drugs against N. spathiger infection in both gazelle species. Reduction in arithmetic mean faecal egg counts achieved by Ivermectin and Levamisole in the reem Gazelles was 94% and 89.3%, respectively. The reduction in the idmi Gazelles was 97.2% and 96.4%, respectively. Hence, both anthelmintics appeared to be more effective in the idmi Gazelles than in the reem Gazelles, however, there was no significant difference in the faecal egg reduction tests in both animal species.
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HAMMONDIA HEYDORNI FROM THE ARABIAN MOUNTAIN GAZELLE AND RED FOX IN
2003Co-Authors: Saudi Arabia, Osama B. Mohammed, Angela J. Davies, Hussein S. Husseint, Peter Daszak, John EllisAbstract:Unsporulated oocysts were detected in the feces of an Arabian red fox (Vulpes vulpes arabica) between 6 and 8 days after it had been fed meat from Arabian mountain Gazelles (Gazella gazella) known to contain sarcocysts. No oocysts were discovered in the feces of other experimental cubs, although sporocysts of Sarcocystis spp. were passed subsequently by all cubs that were fed gazelle meat, including those fed with reem (G. subgutturosa marica). The oocysts sporulated in 3 days at room temperature (25 ?_ 2 C); they were 10.9 ?+ 1.4 X 10.1 ?_ 1.3 pm, with 2 sporocysts measuring 6.0 + 0.6 X 4.7 ?_ 0.8 pm, each with 4 sporozoites. Sporulated oocysts were identified as those of Hammondia heydorni using molecular and standard morpho- metric techniques. Sequence differences between 2 fox and 3 dog isolates of H. heydorni were detected and allowed differentiation between the 2 populations of the organism. The involvement of Neospora caninum was excluded using molecular methods. The Arabian red fox and the Arabian mountain gazelle in Saudi Arabia are new, definitive and intermediate hosts for H. heydorni. Hammondia heydorni (Tadros and Laarman, 1976) Dubey, 1977 is a heteroxenous intestinal coccidium of canines, with a
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Hammondia heydorni from the arabian mountain gazelle and red fox in Saudi Arabia
The Journal of parasitology, 2003Co-Authors: Osama B. Mohammed, Hussein S. Hussein, Angela J. Davies, Peter Daszak, John EllisAbstract:Unsporulated oocysts were detected in the feces of an Arabian red fox (Vulpes vulpes arabica) between 6 and 8 days after it had been fed meat from Arabian mountain Gazelles (Gazella gazella) known to contain sarcocysts. No oocysts were discovered in the feces of other experimental cubs, although sporocysts of Sarcocystis spp. were passed subsequently by all cubs that were fed gazelle meat, including those fed with reem (G. subgutturosa marica). The oocysts sporulated in 3 days at room temperature (25 ± 2 C); they were 10.9 ± 1.4 × 10.1 ± 1.3 μm, with 2 sporocysts measuring 6.0 ± 0.6 × 4.7 ± 0.8 μm, each with 4 sporozoites. Sporulated oocysts were identified as those of Hammondia heydorni using molecular and standard morphometric techniques. Sequence differences between 2 fox and 3 dog isolates of H. heydorni were detected and allowed differentiation between the 2 populations of the organism. The involvement of Neospora caninum was excluded using molecular methods. The Arabian red fox and the Arabian mount...
David Blank - One of the best experts on this subject based on the ideXlab platform.
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the economics of scent marking with urine and feces in goitered gazelle gazella subgutturosa
Acta Theriologica, 2015Co-Authors: David Blank, Kathreen E Ruckstuhl, Weikang YangAbstract:Apart from the purely physiological excretion function, many mammals use their own urine and feces as reliable, odoriferous signals to indicate territorial occupancy. Marking is especially important for many antelopes, as territoriality is linked to reproductive success in these species. Scent marking with excrement, though, imposes physiological constraints in the amounts of urine and feces they can produce for these acts. Some male antelopes have been found to be able to regulate the size of their fecal marks, increasing marking frequency and decreasing the volume per defecation deposit compared to that of females. In this paper, we investigate quantitative characteristics of urination-defecation acts in goitered Gazelles (Gazella subgutturosa), such as excretion frequency and duration, and explain potential differences in urine and fecal marking behavior for goitered Gazelles based on sex, age, season, and territorial status. Our study found that frequency of urination-defecation acts in adult males fluctuated significantly over seasons and was highest in males during the rut, while subadult males urinated-defecated more rarely and with longer acts of urination than adults. In contrast, females (both adult and subadult) urinated and defecated at the same rate without significant seasonal changes. During the rutting period, urination duration in adult males decreased significantly with the rate increasing but even then, urination duration was longer than in females; defecation duration, on the other hand, remained relatively stable in adult males over months compared to urination duration, irrespective of rate. This finding is contradictory to the “material (urine and feces) saving hypothesis” as found for male oribi (Ourebia ourebi). We also discovered that in contrast to females and non-territorial males, territorial goitered gazelle males intensively ate snow during the rut, likely to compensate for water loss during their vigorous urination marking activity. The stability in defecation duration in adult and subadult males, however, regardless of seasonal changes in rate, was difficult to explain.
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secretion marking with preorbital glands in goitered gazelle gazella subgutturosa artiodactyla bovidae
Folia Zoologica, 2014Co-Authors: David Blank, Kathreen E Ruckstuhl, Weikang YangAbstract:Scent marking is a widespread component of mammal communication and important in the maintenance of territories as a form of status signal advertising territorial ownership, and potential source of information on the quality and competitive ability of the signaller. Marking behaviour with preorbital glands is a common research topic for tropical antelopes, while such behaviour in goitered Gazelles, until now, has been poorly understood. We investigated this behaviour in goitered Gazelles and found that adult males marked with their preorbital glands all year round, but especially intensively during the rut and most often while patrolling their territories and chasing females; rarely did they mark during territorial conflicts. Adult males preferred to mark the most conspicuous eatable shrubs that reached close to the height of the male. With a few minor exceptions, goitered gazelle performed marking behaviours in a manner similar to other antelope species, and overall did not show any distinctive differences. Preorbital marking behaviour as an essential part of social organization demonstrated its conservatism, but environmental factors also had their impacts, which led to considerable quantitative seasonal fluctuations in marking behaviour.
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sex ratio in goitered Gazelles gazella subgutturosa guldenstaedt 1780
Acta Theriologica, 2013Co-Authors: David Blank, Weikang YangAbstract:We studied the sex ratio of goitered Gazelles in the naturally arid environment of Kazakhstan over a 6-year period. The main methods in our study were taking transect counts and focal observations. The sex ratio of adult goitered Gazelles has demonstrated a female bias due to a much higher mortality of males of all ages, especially during years with unusually severe winters. This phenomenon is typical for many polygynous ungulates, as well as other gazelle species. Surprisingly, our data demonstrated monthly fluctuations in sex proportions, along with a bias shift from a female-dominant population during most of the year to a male-dominant population during spring. We discovered, though, that our data did not reflect any real changes in the sex ratio of the population but, instead, revealed the radical changes in behavior of pregnant females before giving birth—hiding from danger in thick shrubs or broken terrain rather than fleeing. As a result, we were not able to see many pregnant females in our spring samples (before birthing), and so received a male-biased population. During the rest of the year (after birthing), females returned to their usual behaviors of fleeing from danger that then gave us a female-biased sex ratio that reflected a more accurate status in sex proportions of the population. So, our results discovered seasonal sex difference in hiding behavior which led to a bias based on visibility.
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social organization in goitered gazelle gazella subgutturosa guldenstaedt 1780
Ethology Ecology & Evolution, 2012Co-Authors: David Blank, Kathreen E Ruckstuhl, Weikang YangAbstract:The population structure of goitered Gazelles was investigated in Kazakhstan over several years. We found that the social organization of goitered gazelle changed over months mostly because of their birthing and rutting behaviour, and seasonal migrations. Female groups were smallest and solitary females were the most numerous during parturition in May and these groups were largest during rutting season in November–December. In contrast, male groups were smallest and solitary males were the most numerous during the rutting period, while during the rest of the year they formed considerably larger groups although male singletons were always common. Mixed-sex groups were typical for spring and autumn migration periods in March–April and in October. The month also influenced the population structure with larger groups more common during cold months and smaller groups frequently observed during hot months, but such impact was not as distinctive as in the case of biological events (birthing, mating and migration...
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influence of population density on group sizes in goitered gazelle gazella subgutturosa guld 1780
European Journal of Wildlife Research, 2012Co-Authors: David Blank, Kathreen E Ruckstuhl, Weikang YangAbstract:We conducted our study in Ili depression, south-eastern Kazakhstan during 1981–1989 to investigate how group sizes and group class frequencies change with increasing population densities in goitered Gazelles. In addition, we compared our study to data on group size and group class frequency of various goitered gazelle populations in Kazakhstan with very variable population densities. We found that mean group size was a more variable index than group class frequency. Population density had some effect on mean group sizes, but the strength of the influence was quite weak, and only in cases where densities of two populations varied more than sevenfold did group sizes start to change. Group class frequency was not correlated with population density at all. The impact of the yearly breeding cycle on group size was bigger than population density. The density-dependent response of goitered gazelle population was curvilinear in fashion, and it may be classified as intermediate between social-dwelling ungulate species, living in large groups and demonstrating continuous (linear) increases of group size with population density and those that are solitary or territorial ungulate species with no relationship between population size and group size, though the goitered gazelle population’s weak response was distinctively closer to the one of solitary ungulate species.
Weikang Yang - One of the best experts on this subject based on the ideXlab platform.
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the economics of scent marking with urine and feces in goitered gazelle gazella subgutturosa
Acta Theriologica, 2015Co-Authors: David Blank, Kathreen E Ruckstuhl, Weikang YangAbstract:Apart from the purely physiological excretion function, many mammals use their own urine and feces as reliable, odoriferous signals to indicate territorial occupancy. Marking is especially important for many antelopes, as territoriality is linked to reproductive success in these species. Scent marking with excrement, though, imposes physiological constraints in the amounts of urine and feces they can produce for these acts. Some male antelopes have been found to be able to regulate the size of their fecal marks, increasing marking frequency and decreasing the volume per defecation deposit compared to that of females. In this paper, we investigate quantitative characteristics of urination-defecation acts in goitered Gazelles (Gazella subgutturosa), such as excretion frequency and duration, and explain potential differences in urine and fecal marking behavior for goitered Gazelles based on sex, age, season, and territorial status. Our study found that frequency of urination-defecation acts in adult males fluctuated significantly over seasons and was highest in males during the rut, while subadult males urinated-defecated more rarely and with longer acts of urination than adults. In contrast, females (both adult and subadult) urinated and defecated at the same rate without significant seasonal changes. During the rutting period, urination duration in adult males decreased significantly with the rate increasing but even then, urination duration was longer than in females; defecation duration, on the other hand, remained relatively stable in adult males over months compared to urination duration, irrespective of rate. This finding is contradictory to the “material (urine and feces) saving hypothesis” as found for male oribi (Ourebia ourebi). We also discovered that in contrast to females and non-territorial males, territorial goitered gazelle males intensively ate snow during the rut, likely to compensate for water loss during their vigorous urination marking activity. The stability in defecation duration in adult and subadult males, however, regardless of seasonal changes in rate, was difficult to explain.
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secretion marking with preorbital glands in goitered gazelle gazella subgutturosa artiodactyla bovidae
Folia Zoologica, 2014Co-Authors: David Blank, Kathreen E Ruckstuhl, Weikang YangAbstract:Scent marking is a widespread component of mammal communication and important in the maintenance of territories as a form of status signal advertising territorial ownership, and potential source of information on the quality and competitive ability of the signaller. Marking behaviour with preorbital glands is a common research topic for tropical antelopes, while such behaviour in goitered Gazelles, until now, has been poorly understood. We investigated this behaviour in goitered Gazelles and found that adult males marked with their preorbital glands all year round, but especially intensively during the rut and most often while patrolling their territories and chasing females; rarely did they mark during territorial conflicts. Adult males preferred to mark the most conspicuous eatable shrubs that reached close to the height of the male. With a few minor exceptions, goitered gazelle performed marking behaviours in a manner similar to other antelope species, and overall did not show any distinctive differences. Preorbital marking behaviour as an essential part of social organization demonstrated its conservatism, but environmental factors also had their impacts, which led to considerable quantitative seasonal fluctuations in marking behaviour.
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sex ratio in goitered Gazelles gazella subgutturosa guldenstaedt 1780
Acta Theriologica, 2013Co-Authors: David Blank, Weikang YangAbstract:We studied the sex ratio of goitered Gazelles in the naturally arid environment of Kazakhstan over a 6-year period. The main methods in our study were taking transect counts and focal observations. The sex ratio of adult goitered Gazelles has demonstrated a female bias due to a much higher mortality of males of all ages, especially during years with unusually severe winters. This phenomenon is typical for many polygynous ungulates, as well as other gazelle species. Surprisingly, our data demonstrated monthly fluctuations in sex proportions, along with a bias shift from a female-dominant population during most of the year to a male-dominant population during spring. We discovered, though, that our data did not reflect any real changes in the sex ratio of the population but, instead, revealed the radical changes in behavior of pregnant females before giving birth—hiding from danger in thick shrubs or broken terrain rather than fleeing. As a result, we were not able to see many pregnant females in our spring samples (before birthing), and so received a male-biased population. During the rest of the year (after birthing), females returned to their usual behaviors of fleeing from danger that then gave us a female-biased sex ratio that reflected a more accurate status in sex proportions of the population. So, our results discovered seasonal sex difference in hiding behavior which led to a bias based on visibility.
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social organization in goitered gazelle gazella subgutturosa guldenstaedt 1780
Ethology Ecology & Evolution, 2012Co-Authors: David Blank, Kathreen E Ruckstuhl, Weikang YangAbstract:The population structure of goitered Gazelles was investigated in Kazakhstan over several years. We found that the social organization of goitered gazelle changed over months mostly because of their birthing and rutting behaviour, and seasonal migrations. Female groups were smallest and solitary females were the most numerous during parturition in May and these groups were largest during rutting season in November–December. In contrast, male groups were smallest and solitary males were the most numerous during the rutting period, while during the rest of the year they formed considerably larger groups although male singletons were always common. Mixed-sex groups were typical for spring and autumn migration periods in March–April and in October. The month also influenced the population structure with larger groups more common during cold months and smaller groups frequently observed during hot months, but such impact was not as distinctive as in the case of biological events (birthing, mating and migration...
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influence of population density on group sizes in goitered gazelle gazella subgutturosa guld 1780
European Journal of Wildlife Research, 2012Co-Authors: David Blank, Kathreen E Ruckstuhl, Weikang YangAbstract:We conducted our study in Ili depression, south-eastern Kazakhstan during 1981–1989 to investigate how group sizes and group class frequencies change with increasing population densities in goitered Gazelles. In addition, we compared our study to data on group size and group class frequency of various goitered gazelle populations in Kazakhstan with very variable population densities. We found that mean group size was a more variable index than group class frequency. Population density had some effect on mean group sizes, but the strength of the influence was quite weak, and only in cases where densities of two populations varied more than sevenfold did group sizes start to change. Group class frequency was not correlated with population density at all. The impact of the yearly breeding cycle on group size was bigger than population density. The density-dependent response of goitered gazelle population was curvilinear in fashion, and it may be classified as intermediate between social-dwelling ungulate species, living in large groups and demonstrating continuous (linear) increases of group size with population density and those that are solitary or territorial ungulate species with no relationship between population size and group size, though the goitered gazelle population’s weak response was distinctively closer to the one of solitary ungulate species.
Sawsan A. Omer - One of the best experts on this subject based on the ideXlab platform.
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cross infection with gastro intestinal tract parasites between domestic goat and endemic farasan gazelle gazella gazella farasani in farasan islands saudi arabia
Journal of King Saud University - Science, 2013Co-Authors: Ann Apio, Sawsan A. Omer, Osama B. Mohammed, Torsten WronskiAbstract:Abstract Host related variations in helminth egg and coccidian oocyst counts were compared between a naturally infected endemic population of Farasan gazelle and domestic goats on the Farasan Islands, Saudi Arabia in April 2009. Both bovid species inhabit and browse in the same area but no cross-infection could be detected. The prevalence and mean intensity quantified as the number of eggs and oocysts per gram of faeces were taken as a measure of parasite burdens. Host related differences in prevalence values of Eimeria spp. were significantly higher in domestic goats than in wild Gazelles. A similar trend was observed for nematode prevalence (strongyle-type eggs), with no infection in gazelle and low infection in goats. There was also a significant difference in mean intensity values between different Eimeria spp. found in domestic goats.
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coagulation profile and platelet parameters of the arabian sand gazelle gazella subgutturosa marica comparison with humans and camels
Journal of Wildlife Diseases, 2010Co-Authors: Mansour F. Hussein, Osama B. Mohammed, Sawsan A. Omer, Riyadh S. Aljumaah, M. A. Alshaikh, Abdelgadir Homeida, A Alhaidary, A Gar R Elnabi, William MacaseroAbstract:During March 2009, we evaluated the hemostatic profile and platelet indices of 18 Arabian sand Gazelles (Gazella subgutturosa marica) and compared the results with those from humans and camels (Camelus dromedarius). Gazelles and camels had shorter activated partial thromboplastin times, lower proconvertin and higher antihemophilic factor coagulation activity, and plasma fibrinogen levels than humans. Prothrombin time was longer in sand Gazelles and shorter in camels than it was in humans. Plasma thromboplastin component, Stuart factor, and plasma thromboplastin antecedent were similar in Gazelles, humans, and camels, whereas the platelet count of the sand gazelle was significantly higher than it was for camels and humans.
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the efficacy of ivermectin and levamisole against natural nematodirus spathiger infection in the arabian sand gazelle gazella subgutturosa marica and the arabian mountain gazelle gazella gazella in saudi arabia
Veterinary Parasitology, 2007Co-Authors: Osama B. Mohammed, Sawsan A. Omer, Mohammed A. SandoukaAbstract:The efficacy of two broad spectrum anthelmintics (Ivermectin and Levamisole) against the nematode Nematodirus spathiger in the reem (Arabian sand gazelle) and idmi (Arabian mountain gazelle) at King Khalid Wildlife Research Centre (KKWRC) was determined. Gazelles of both species naturally infected with N. spathiger were each divided into 3 groups. One group was treated with Ivermectin, the other group with Levamisole and the last group was left as untreated control. Faecal egg counts were employed to determine the efficacy of the two drugs against N. spathiger infection in both gazelle species. Reduction in arithmetic mean faecal egg counts achieved by Ivermectin and Levamisole in the reem Gazelles was 94% and 89.3%, respectively. The reduction in the idmi Gazelles was 97.2% and 96.4%, respectively. Hence, both anthelmintics appeared to be more effective in the idmi Gazelles than in the reem Gazelles, however, there was no significant difference in the faecal egg reduction tests in both animal species.
