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Topic:Ecology

The study of ecology and horses involves examining the interactions between horses and their environments, including both natural and managed ecosystems. This field explores how horses influence and are influenced by various ecological factors such as vegetation, soil, water sources, and other animal species. Research in this area may address topics such as the grazing behavior of horses, their impact on plant communities, and the role of horses in nutrient cycling within ecosystems. Additionally, studies may investigate the effects of environmental changes and human activities on horse populations and their habitats. This page compiles peer-reviewed research studies and scholarly articles that analyze the ecological roles of horses, their interactions with ecosystems, and the implications for conservation and land management.
[Social and behavioral organization of horses on the Giara (Sardinia): distribution and aggregation].
Bollettino della Societa italiana di biologia sperimentale    November 1, 1990   Volume 66, Issue 11 1089-1096 
Cancedda M.In this paper some considerations on the environment of the 42 Kmq of the volcanic-basaltic Giara tableland are discussed. Conditioning by the environment and its effect on the distribution of a population of 712 horses is illustrated in view of their social and behavioural organization.
Trajectory analysis of winds and eastern equine encephalitis in USA, 1980-5.
Epidemiology and infection    April 1, 1990   Volume 104, Issue 2 329-343 doi: 10.1017/s0950268800059501
Sellers RF, Maarouf AR.Backward trajectories of winds were determined to identify possible sources of eastern equine encephalitis virus associated with isolation of virus from mosquitoes or birds or outbreaks in horses between 1980 and 1985 in Maryland, New Jersey, New York and Michigan, USA. The results of the trajectory analyses suggested that eastern equine encephalitis virus could have been carried by infected mosquitoes on surface winds at temperatures 13 degrees C or higher from North Carolina north-eastwards along the Atlantic Coast to Maryland and New Jersey and thence to upstate New York and from western Ke...
Horse diversity through the ages.
Biological reviews of the Cambridge Philosophical Society    November 1, 1989   Volume 64, Issue 4 279-304 doi: 10.1111/j.1469-185x.1989.tb00677.x
Forsten A.No abstract available
Seasonal translation of equine strongyle infective larvae to herbage in tropical Australia.
Veterinary parasitology    October 1, 1989   Volume 33, Issue 3-4 251-263 doi: 10.1016/0304-4017(89)90135-0
Hutchinson GW, Abba SA, Mfitilodze MW.Longevity in faeces, migration to and survival on herbage of mixed strongyle infective larvae (approximately 70% cyathostomes: 30% large strongyles) from experimentally deposited horse faeces was studied in the dry tropical region of North Queensland for up to 2 years. Larvae were recovered from faeces deposited during hot dry weather for a maximum of 12 weeks, up to 32 weeks in cool conditions, but less than 8 weeks in hot wet summer. Translation to herbage was mainly limited to the hot wet season (December-March), except when unseasonal winter rainfall of 40-50 mm per month in July and Augus...
Hosts of Anopheles earlei Vargas (Diptera: Culicidae) in southwestern Manitoba.
Journal of medical entomology    March 1, 1988   Volume 25, Issue 2 149-150 doi: 10.1093/jmedent/25.2.149
Anderson RA, Gallaway WJ.No abstract available
[Endangered domestic animal breeds in German-speaking countries. V. Horses].
Tierarztliche Praxis    January 1, 1988   Volume 16, Issue 1 13-19 
Sambraus HH.Due to motorization the heavy horses, in particular draught horses and carriage horses, were deprived of their "raison d'être". At present therefore, they mostly are found in small livestocks. The past few years they regained some significance through their work in the forests, as an attraction in tourism or somewhere else. In German speaking countries approximately 15 horse breeds must be considered to be threatened in their existence. Breeding history, appearance, use and geographical distribution of 12 of them are discussed in this article.
Ecology of Rhodococcus equi in horses and their environment on horse-breeding farms.
Veterinary microbiology    August 1, 1987   Volume 14, Issue 3 233-239 doi: 10.1016/0378-1135(87)90110-6
Takai S, Fujimori T, Katsuzaki K, Tsubaki S.Quantitative culture of R. equi in the feces of dams and foals, in the air of the stalls and in the soil of the paddocks was carried out on three horse-breeding farms during the foaling season. The isolation rates of R. equi from the feces of dams from the 3 farms suddenly increased to approximately 80% at the end of March, when the snow in the paddocks finished melting, and remained at that level during April and May. The mean number of R. equi and the isolation rate of R. equi from the feces of dams on the farms were investigated for 5 weeks before and 5 weeks after delivery. During the 10 w...
[Ecological characteristics of horse stomach botflies in Uzbekistan].
Parazitologiia    July 1, 1987   Volume 21, Issue 4 577-579 
Enileeva NKh.The paper describes the flight periods and dynamics of abundance of horse botflies, life span of females and males, effect of environmental factors on the activity of flies and their behaviour, potential fecundity of different species of botflies, duration of embryonal development, preservation of viability of larvae in egg membranes, localization of different stages of botflies in the host, and methods of their control.
The host preferences of Culiseta inornata in southwestern Manitoba.
Journal of the American Mosquito Control Association    June 1, 1987   Volume 3, Issue 2 219-221 
Anderson RA, Gallaway WJ.The capillary tube precipitin test was used to determine the host utilization patterns of Culiseta inornata in southwestern Manitoba. Ruminant blood was identified in 83.3% and equine blood in 15.8% of 1,036 positively reacting blood-meals. Human, swine and avian blood accounted for 0.9% of these blood-meals and mixed blood-meals accounted for 1.5% of the total. Culiseta inornata preferentially fed on large mammals, and selection between cattle and horses reflected the relative abundance of these two hosts rather than a specific preference for either one.
Influence of Familiarity on Frequency of Inbreeding in Wild Horses.
Evolution; international journal of organic evolution    January 1, 1987   Volume 41, Issue 1 229-231 doi: 10.1111/j.1558-5646.1987.tb05788.x
Berger J, Cunningham C.No abstract available
Social structure.
The Veterinary clinics of North America. Equine practice    December 1, 1986   Volume 2, Issue 3 465-484 doi: 10.1016/s0749-0739(17)30701-0
Keiper RR.Socially feral horses live in stable social groups characterized by one adult male, a number of adult females, and their offspring up to 2 years of age. Extra males either live by themselves or with other males in bachelor groups. The bands occupy nondefended home ranges that often overlap. Many abnormal behaviors seen in domestic horses occur because some aspect of their normal social behavior cannot be carried out in captivity.
A feral population: wild horses of the great basin.
Science (New York, N.Y.)    August 8, 1986   Volume 233, Issue 4764 672 doi: 10.1126/science.233.4764.672
Jarman PJ.No abstract available
Strongylid parasites of horses: experimental ecology of the free-living stages on the Canadian prairie.
American journal of veterinary research    August 1, 1986   Volume 47, Issue 8 1686-1693 
Polley L.Each month for a 1-year period (October through September), equine fecal masses containing eggs of strongylid nematodes were placed outdoors on small grass plots in Saskatchewan, Canada. Thereafter, feces and grass from the plots were sampled after intervals of 1 week or longer, and the strongylid eggs and larvae recovered were counted. These observations were made over a 2-year period. Development of eggs to infective larvae occurred in all experiments, except those established in October, December, and January. Infective larvae from experiments set up in April through September survived that...
Ecology of Rhodococcus (Corynebacterium) equi in soil on a horse-breeding farm.
Veterinary microbiology    July 1, 1986   Volume 12, Issue 2 169-177 doi: 10.1016/0378-1135(86)90078-7
Takai S, Narita K, Ando K, Tsubaki S.The ecology of Rhodococcus (Corynebacterium) equi in soil was studied on a horse-breeding farm. R. equi was cultured from soil at a depth of 0, 10, and 20 cm on the six sites of the farm at monthly intervals for 10 months from March to December of 1983. The highest numbers of R. equi were found in the surface soil. The mean number of bacteria in soil samples at every depth increased remarkably from 0 or 10(2) to 10(4) colony-forming units (CFU) g-1 of soil in the middle of April, and later decreased gradually. R. equi inoculated into six soil exudate broths prepared from surface soils at separ...
Arbovirus investigations in Argentina, 1977-1980. I. Historical aspects and description of study sites.
The American journal of tropical medicine and hygiene    September 1, 1985   Volume 34, Issue 5 937-944 
Sabattini MS, Monath TP, Mitchell CJ, Daffner JF, Bowen GS, Pauli R, Contigiani MS.This is the introductory paper to a series on the ecology of arboviruses in Argentina. Epizootics of equine encephalitis have occurred since at least 1908, principally in the Pampa and Espinal biogeographic zones, with significant economic losses; human cases of encephalitis have been rare or absent. Both western equine and eastern equine encephalitis viruses have been isolated from horses during these epizootics, but the mosquitoes responsible for transmission have not been identified. A number of isolations of Venezuelan equine encephalitis (VEE) virus were reported between 1936 and 1958 in ...
[Mechanism of distribution of Strongyloidea larvae among ungulate animals at pasture].
Parazitologiia    May 1, 1985   Volume 19, Issue 3 220-225 
Kozlov DP.The problem of dissimilation of larvae of strongylates of ruminants in pasture biocoenosis is discussed. A new form of their migration in horizontal direction on the basis of negative geotaxis is suggested. As a result of alternation of vertical migration of larvae on the tilting leaves of the grass and their subsequent washing off with rain or dew down on the ground proceeds their distribution on the pasture. The description of corresponding experiments is given.
The use of an animal-baited net trap for collecting mosquitoes during western equine encephalitis investigations in Argentina.
Journal of the American Mosquito Control Association    March 1, 1985   Volume 1, Issue 1 43-47 
Mitchell CJ, Darsie RF, Monath TP, Sabattini MS, Daffner J.A large net trap was used to sample mosquito populations attracted to horses at three sites each in Santa Fe and Rio Negro Provinces, Argentina, during the austral summer of 1984. These provinces, as well as others in Argentina, were affected by a severe epizootic of western equine encephalitis (WEE) during 1982-83. Totals of 2,752 and 6,929 mosquitoes were collected in Santa Fe and Rio Negro Provinces during five and three trap nights, respectively. Culex mosquitoes of the subgenus Culex were predominant (45.8% of total) in the Santa Fe collections, although Aedes albifasciatus also was preva...
Reproduction in feral horses: an eight-year study.
American journal of veterinary research    May 1, 1984   Volume 45, Issue 5 991-995 
Keiper R, Houpt K.The reproductive rate and foal survival of the free-ranging ponies on Assateague Island National Seashore were studied for 8 years, 1975 to 1982. Most (52%) of the 86 foals were born in May, 13% were born in April, 22.6% in June, 10.4% in July, and less than 1% in August and September. The mean foaling rate was 57.1 +/- 3.9% and the survival rate was 88.3 +/- 3.6%. Forty-eight colts and 55 fillies were born (sex ratio 53% female). Mares less than 3 years old did not foal and the foaling rate of 3-year-old mares was only 23%, that of 4-year-old mares was 46%, that of 5-year-old mares was 53%, a...
Ecology of Rhodococcus equi.
Veterinary microbiology    February 1, 1984   Volume 9, Issue 1 65-76 doi: 10.1016/0378-1135(84)90079-8
Barton MD, Hughes KL.A selective broth enrichment technique was used to study the distribution of Rhodococcus equi in soil and grazing animals. Rhodococcus equi was isolated from 54% of soils examined and from the gut contents, rectal faeces and dung of all grazing herbivorous species examined. Rhodococcus equi was not isolated from the faeces or dung of penned animals which did not have access to grazing. The isolation rate from dung was much higher than from other samples and this was found to be due to the ability of R. equi to multiply more readily in dung. Delayed hypersensitivity tests were carried out on ho...
Chemical restraint of wild horses: effects on reproduction and social structure.
Journal of wildlife diseases    July 1, 1983   Volume 19, Issue 3 265-268 doi: 10.7589/0090-3558-19.3.265
Berger J, Kock M, Cunningham C, Dodson N.Twenty-three (9 male, 14 female) wild horses (Equus caballus) in the Great Basin Desert were immobilized by ground techniques with succinylcholine chloride during 1,950 person-hr. Induction (means = 2.09 +/- 0.59 min) and recovery (means = 12.4 +/- 5.0 min) were rapid and most animals were returned in less than 10 min to original bands. Dosages ranged from 0.66-0.77 mg/kg body weight and neither abortions nor band changes in group membership resulted. However, a few concerted efforts up to 24 hr were needed to return some animals to original bands and three non-drug related mortalities occurre...
Ecology and catastrophic mortality in wild horses: implications for interpreting fossil assemblages.
Science (New York, N.Y.)    June 24, 1983   Volume 220, Issue 4604 1403-1404 doi: 10.1126/science.220.4604.1403
Berger J.The identities, sexes, and reproductive status of groups of wild horses (Equus caballus) living in the Great Basin Desert of North America were known prior to their deaths on ridgelines. Another group of very young horses died on a quagmire. Snow accumulation or drought was apparently responsible for the mass deaths. These data have implications for reconstructing some aspects of the social structure of fossil mammals on the basis of skewed sex or age ratios in bone assemblages.
A mark-recapture method for measuring effects of spatial separation of horses on tabanid (Diptera) movement between hosts.
Journal of medical entomology    May 26, 1983   Volume 20, Issue 3 301-305 doi: 10.1093/jmedent/20.3.301
Foil L.No abstract available
Induced abortion and social factors in wild horses.
Nature    May 5, 1983   Volume 303, Issue 5912 59-61 doi: 10.1038/303059a0
Berger J.Much evidence now suggests that the postnatal killing of young in primates and carnivores, and induced abortions in some rodents, are evolved traits exerting strong selective pressures on adult male and female behaviour. Among ungulates it is perplexing that either no species have developed convergent tactics or that these behaviours are not reported, especially as ungulates have social systems similar to those of members of the above groups. Only in captive horses (Equus caballus) has infant killing been reported. It has been estimated that 40,000 wild horses live in remote areas of the Great...
Investigations into the biology of three ‘phycomycotic’ agents pathogenic for horses in Australia.
Mycopathologia    January 17, 1983   Volume 81, Issue 1 23-28 doi: 10.1007/BF00443905
Miller RI.Although 'phycomycosis' is a common disease of horses in northern Australia little is known about the causative fungi. In this paper the laboratory methods for diagnosis are described. These revealed 38 cases caused by Pythium sp. (Hyphomyces destruens), 6 cases caused by Basidiobolus haptosporus and 2 caused by Conidiobolus coronatus. Laboratory studies on the chemotatic behaviour of zoospores of Pythium sp. showed that they were strongly attracted to both animal hairs and plant tissue. Because of this behaviour a simple baiting method using human hair was used to trap the fungus from water s...
Variation in arbovirus infection rates in species of birds sampled in a serological survey during an encephalitis epidemic in the Murray Valley of South-eastern Australia, February 1974.
The Australian journal of experimental biology and medical science    October 1, 1982   Volume 60 (Pt 5) 471-478 doi: 10.1038/icb.1982.52
Marshall ID, Brown BK, Keith K, Gard GP, Thibos E.There was extensive and exuberant breeding of waterbirds before and during an epidemic of arboviral encephalitis in the Murray Valley of south eastern Australia in 1974. As estimated by haemagglutination inhibition tests on 432 bird sera collected between 4th and 13th February, 1974, infection with Murray Valley encephalitis virus, Kunjin virus and possibly other flaviviruses was concentrated in species of the Order Ciconiiformes (55% positive) and Pelecaniformes (41%), compared with only 5% in Anseriformes. Although Sindbis virus infections were also highest in these 2 Orders (56% and 46%, re...
Social organization of feral horses.
Journal of reproduction and fertility. Supplement    January 1, 1982   Volume 32 89-95 
Klingel H.The basic social unit in feral horses is the family group consisting of one stallion, one to a few unrelated mares and their foals. Surplus stallions associate in bachelor groups. Stallions are instrumental in bringing mares together in a unit which then persists even without a stallion. The similarity of social organization in populations living in a variety of different habitats indicates that feral horses have reverted to the habits of their wild ancestors, and that domestication has had no influence on this basic behavioural feature.
Is Rhodococcus equi a soil organism?
Journal of reproduction and fertility. Supplement    January 1, 1982   Volume 32 481-489 
Barton MD, Hughes KL.A total of 189 isolates of Rhodococcus equi and related organisms and 16 marker strains representing the genera Rhodococcus and Corynebacterium were screened for 160 unit characters in a numerical taxonomic study. Analysis of the data indicated that R. equi forms a relatively homogeneous cluster distinctly separated from the recognized species of Rhodococcus and Corynebacterium (sensu stricto). Other members of the genus Rhodococcus are soil organisms and R. equi appears to fit into the genus on ecological as well as taxonomic grounds. It seems unlikely that R. equi could be a gastrointestinal...
Epizootiology of eastern equine encephalomyelitis virus in upstate New York, USA. III. Population dynamics and vector potential of adult Culiseta morsitans (Diptera: Culicidae).
Journal of medical entomology    July 1, 1981   Volume 18, Issue 4 313-316 doi: 10.1093/jmedent/18.4.313
Morris CD, Zimmerman RH.No abstract available
Grassland management for horses.
The Veterinary record    August 23, 1980   Volume 107, Issue 8 171-174 doi: 10.1136/vr.107.8.171
Archer M.The pasture needs for horses as compared to those for farm livestock are reviewed. The differing preferences of various types of grasses and other plants, and the patterns of grazing seen on"horse-sick" pastures, are discussed. Suggestions for practical management include frequent collection and removal of droppings, the use of grazing by cattle, adequate rest from horses and the application of cattle manure. Methods for controlling weeds and renovating horse-sick paddocks are discussed and compared to ploughing up. Finally, the place of fertilisers is considered for use on pastures for horses...
Equine influenza–a segment in influenza virus ecology.
Comparative immunology, microbiology and infectious diseases    January 1, 1980   Volume 3, Issue 1-2 45-59 doi: 10.1016/0147-9571(80)90038-7
Tůmová B.No abstract available