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Feh, C.; Munkhtuya, B.; Enkhbold, S.; Sukhbaatar, T. |
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Ecology and social structure of the Gobi khulan Equus hemionus subsp. in the Gobi B National Park, Mongolia |
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Journal Article |
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Year |
2001 |
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Biological Conservation |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Biol. Conserva. |
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101 |
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1 |
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51-61 |
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Equus hemionus; Ecology and social structure; Gobi National Park; Mongolia |
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The status of the Gobi khulan Equus hemionus subsp. is recorded as “insufficiently known” in the Species Survival Commission's Equid Action Plan. Recent counts confirm that Mongolia holds the most important population of the whole species. Since 1953, the animals have benefited from a protected status, but this is now challenged. A 5-year study in the B part of the Gobi National Park on one subpopulation showed that it has remained stable over the past 15 years with an adequate mean reproductive rate of 15% and a 50% survival rate over the first year. Age/sex related mortality and prey analysis indicate that wolf predation probably has some impact on the population, in particular for 4-6-year-olds of both sexes at the start of reproduction. Desert and mountain steppes are the khulan's year-round preferred habitat, but `oases', play an important role at the beginning of lactation. Anthropogenic factors affect both home range and habitat use through direct intervention or permanent occupation of the scarce water sources. Khulans of this subpopulation, unlike other Asian and African wild asses, form year-round stable, non-territorial families. These families and all-male groups join together into “bands” in winter, and herds of several hundred animals, where reproductive rate is highest, form throughout the year. The existence of such herds may thus be critical for the breeding success of the population. Our study provides the first detailed quantitative data for this subspecies, which will help to monitor changes in the future. |
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Equine Behaviour @ team @ |
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2289 |
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Yamada, T.; Rojanasuphot, S.; Takagi, M.; Wungkobkiat, S.; Hirota, T. |
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Studies on an epidemic of Japanese encephalitis in the northern region of Thailand in 1969 and 1970 |
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Journal Article |
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1971 |
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Biken Journal |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Biken J |
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14 |
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3 |
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267-296 |
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Adolescent; Adult; Animals; Arboviruses/immunology; Buffaloes; Cattle; Chickens; Child; Child, Preschool; Cross Reactions; Culicidae; Dengue Virus/immunology; Disease Outbreaks; Ducks; Ecology; Encephalitis Virus, Japanese/immunology/isolation & purification; Encephalitis, Japanese/cerebrospinal fluid/*epidemiology/immunology/microbiology/mortality; Female; Hemagglutination Inhibition Tests; Hemorrhagic Fevers, Viral/epidemiology; Horses; Humans; Infant; Male; Mice; Neutralization Tests; Swine; Thailand |
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0006-2324 |
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PMID:4400462 |
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Equine Behaviour @ team @ |
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2728 |
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Barton, R.A.; Byrne, R.W.; Whiten, A. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Ecology, feeding competition and social structure in baboons |
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Journal Article |
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1996 |
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Behavioral Ecology and Sociobiology |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Behav. Ecol. Sociobiol. |
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38 |
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5 |
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321-329 |
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Key words Ecology – Competition – Group size – Baboons |
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Predictions of the model of van Schaik (1989) of female-bonding in primates are tested by systematically comparing the ecology, level of within-group contest competition for food (WGC), and patterns of social behaviour found in two contrasting baboon populations. Significant differences were found in food distribution (percentage of the diet from clumped sources), feeding supplant rates and grooming patterns. In accord with the model, the tendencies of females to affiliate and form coalitions with one another, and to be philopatric, were strongest where ecological conditions promoted WGC. Group fission in the population with strong WGC was “horizontal” with respect to female dominance rank, and associated with female-female aggression during a period of elevated feeding competition. In contrast, where WGC was low, females' grooming was focused on adult males rather than other females. Recent evidence suggests that group fission here is initiated by males, tends to result in the formation of one-male groups, and is not related to feeding competition but to male-male competition for mates. An ecological model of baboon social structure is presented which incorporates the effects of female-female competition, male-male competition, and predation pressure. The model potentially accounts for wide variability in group size, group structure and social relationships within the genus Papio. Socio-ecological convergence between common baboons and hamadryas baboons, however, may be limited in some respects by phylogenetic inertia. |
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refbase @ user @ |
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807 |
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Author |
Lusseau, D.; Conradt, L. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
The emergence of unshared consensus decisions in bottlenose dolphins |
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Journal Article |
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2009 |
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Behavioral Ecology and Sociobiology |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Behav. Ecol. Sociobiol. |
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63 |
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7 |
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1067-1077 |
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Behavioral ecology – Decision-making process – Bottlenose dolphin – Group living |
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Abstract Unshared consensus decision-making processes, in which one or a small number of individuals make the decision for the rest of a group, are rarely documented. However, this mechanism can be beneficial for all group members when one individual has greater knowledge about the benefits of the decision than other group members. Such decisions are reached during certain activity shifts within the population of bottlenose dolphins residing in Doubtful Sound, New Zealand. Behavioral signals are performed by one individual and seem to precipitate shifts in the behavior of the entire group: males perform side flops and initiate traveling bouts while females perform upside-down lobtails and terminate traveling bouts. However, these signals are not observed at all activity shifts. We find that, while side flops were performed by males that have greater knowledge than other male group members, this was not the case for females performing upside-down lobtails. The reason for this could have been that a generally high knowledge about the optimal timing of travel terminations rendered it less important which individual female made the decision. |
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Equine Behaviour @ team @ |
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5109 |
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Author |
Sterck, E.; Watts, D.; van Schaik, C. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
The evolution of female social relationships in nonhuman primates |
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Journal Article |
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Year |
1997 |
Publication |
Behavioral Ecology and Sociobiology |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Behav. Ecol. Sociobiol. |
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41 |
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5 |
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291-309 |
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ecology; matrilocal; primate; social; theory |
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Considerable interspeci®c variation in female social relationships occurs in gregarious primates, particularly with regard to agonism and cooperation between females and to the quality of female relationships with males. This variation exists alongside variation in female philopatry and dispersal. Socioecological theories have tried to explain variation in female-female social relationships from an evolutionary perspective focused on ecological factors, notably predation and food distribution. According to the current ``ecological model'', predation risk forces females of most diurnal primate species to live in groups; the strength of the contest component of competition for resources within and between groups then largely determines social relationships between females. Social elationships among gregarious females are here characterized as DispersalEgalitarian, Resident-Nepotistic, Resident-Nepotistic-Tolerant, or Resident-Egalitarian. This ecological model has successfully explained i€erences in the occurrence of formal submission signals, decided dominance relation ships, coalitions and female philopatry. Group size and female rank generally a€ect female reproduction success as the model predicts, and studies of closely related species in di€erent ecological circumstances underscore the importance of the model. Some cases, however, can only be explained when we extend the model to incorporate the e€ects of infanticide risk and habitat saturation. We review evidence in support of the ecological model and test the power of alternative models that invoke between-group competition, forced female philopatry, demographic female recruitment, male interventions into female aggression, and male harassment.
Not one of these models can replace the ecological model, which already encompasses the between-group competition. Currently the best model, which explains
several phenomena that the ecological model does not, is a ``socioecological model'' based on the combined importance of ecological factors, habitat saturation and infanticide avoidance. We note some points of similarity and divergence with other mammalian taxa; these remain to be explored in detail. |
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Equine Behaviour @ team @ |
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5227 |
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Kampmann, S.; Hampson, B.A.; Pollitt, C.C. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Population dynamics of feral horses (Equus caballus) following above-average rainfall in a semi-arid environment of Australia |
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Journal Article |
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2013 |
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Australian Veterinary Journal |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Aust Vet J |
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91 |
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11 |
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482-487 |
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animal welfare; ecology; horses; reproduction; wildlife |
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Background Recent record rainfall in much of semi-arid Central Australia is the most likely reason for a feral horse population increase in excess of normal. Uncontrolled numbers of feral horses have habitat degradation and animal welfare implications. Objectives The aims of this study were to investigate the social structure of feral horses and assess their population growth rate following unseasonably high rainfall. Methods The study area was 4000 km2 of unmanaged, semi-arid country in Central Australia (latitude 24.50°S, longitude 132.10°E). Horses were identified by descriptive features from ground searches, movement-activated cameras and ‘hides’ positioned at key water holes. Wherever possible, sex and age categories were documented. Population growth rate was estimated by the number of foals divided by the number of horses older than 1 year in the observed population. Results A total of 1424 horses were identified and categorised, of which 335 were foals born within the current year. Only 123 juveniles were identified. Of the adult horses, 53.4% were male and 46.6% were female and this differed from parity (P = 0.04). Of the mares, 71.9% had a foal at foot and the population growth rate was 29.5%. Conclusions With a sustained population growth rate of 29.5%, this population of feral horses will more than double within 3 years. The high population increase will likely have a detrimental effect on native fauna and flora and the fragile, semi-arid ecosystems of Central Australia. After a period of high rainfall and plentiful resources, ‘normal’ drought conditions will return and many feral horses will starve and die as they compete for limited resources. |
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1751-0813 |
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Equine Behaviour @ team @ |
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5747 |
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Ribeiro, H.S.; Larangeira, N.L.; Paiva, F. |
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[Prevalence of Dictyocaulus arnfieldi (Cobbald, 1884) Railiet & Henry 1907, in Pantaneira breed horses of the region of Pocone, MT] |
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Journal Article |
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1979 |
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Arquivos do Instituto Biologico |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Arq Inst Biol (Sao Paulo) |
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46 |
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3-4 |
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107-110 |
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Animals; Brazil; Dictyocaulus/*isolation & purification; Ecology; Female; Horses/*parasitology; Male; Metastrongyloidea/*isolation & purification; Seasons |
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The authors sacrificed fifty-five horses originated from the “Pantanal”, lowlands in the State of Mato Grosso in two different periods, droughty period and flooded and they described for the first time the Dictyocaulus arnfieldi in Mato Grosso. Relationship between droughty and flooded periods proved not to occur. |
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Prevalencia de Dictyocaulus arnfieldi (Cobbald, 1884) Railiet & Henry 1907, em cavalos de raca pantaneira da regiao de Pocone, MT |
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0020-3653 |
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PMID:554599 |
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Equine Behaviour @ team @ |
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2693 |
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Pichardo, M. |
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Title |
Valsequillo biostratigraphy. III: Equid ecospecies in Paleoindian sites |
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Journal Article |
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2000 |
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Anthropologischer Anzeiger; Bericht Uber die Biologisch-Anthropologische Literatur |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Anthropol Anz |
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58 |
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3 |
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275-298 |
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Animals; *Ecology; Horses/*classification; Mexico; *Paleodontology; Species Specificity |
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Greater precision in North American Pleistocene equid taxonomy makes it now possible to exploit the ubiquitous horse remains in Paleoindian sites as ecological index-fossils. The horses of Central Mexico and the Southern Plains can be sorted by tooth size alone, except for two rare large horses of the Southern Plains. The species endemic to these grasslands and south to Central Mexico are Equus pacificus (large), E. conversidens (small), E. francisci (smallest). The Southern Plains were also occupied by a specialized grazer E. excelsus (Burnet and Sandia caves) and E. occidentalis (Dry and Sandia caves). West of the Rocky Mountains E. occidentalis was dominant. East of the Mississippi River two woodland species are found: E. fraternus and E. littoralis. |
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0003-5548 |
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PMID:11082786 |
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Equine Behaviour @ team @ |
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2648 |
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Joubert, L.; Oudar, J.; Hannoun, C.; Beytout, D.; Corniou, B.; Guillon, J.C.; Panthier, R. |
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[Epidemiology of the West Nile virus: study of a focus in Camargue. IV. Meningo-encephalomyelitis of the horse] |
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1970 |
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Annales de l'Institut Pasteur |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Ann Inst Pasteur (Paris) |
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118 |
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2 |
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239-247 |
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Animals; Ecology; Encephalitis Viruses/*isolation & purification; Encephalomyelitis, Equine/*epidemiology/immunology; France; Hemagglutination Inhibition Tests; Meningoencephalitis/*veterinary; Neurologic Manifestations; Serologic Tests |
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Epidemiologie du virus West Nile: etude d'un foyer en Camargue. IV. La meningo-encephalomyelite du cheval |
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0020-2444 |
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PMID:5461277 |
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Equine Behaviour @ team @ |
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2737 |
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Shalaby, A.M. |
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Host-preference observations on Anopheles culicifacies (Diptera: Culicidae) in Gujarat State, India |
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Journal Article |
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1969 |
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Annals of the Entomological Society of America |
Abbreviated Journal ![sorted by Abbreviated Journal field, descending order (down)](img/sort_desc.gif) |
Ann Entomol Soc Am |
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62 |
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6 |
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1270-1273 |
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Animals; *Anopheles; Cattle; *Ddt; Dogs; Ecology; Female; Goats; Horses; Humans; India; *Insect Vectors; *Insecticide Resistance; Precipitin Tests; Sheep |
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0013-8746 |
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PMID:5374165 |
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Equine Behaviour @ team @ |
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2739 |
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