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Author |
De Stoppelaire, G.H.; Gillespie, T.W.; Brock, J.C.; Tobin, G.A. |
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Title |
Use of remote sensing techniques to determine the effects of grazing on vegetation cover and dune elevation at Assateague Island National Seashore: impact of horses |
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Journal Article |
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Year |
2004 |
Publication |
Environmental Management |
Abbreviated Journal |
Environ Manage |
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Volume |
34 |
Issue |
5 |
Pages  |
642-649 |
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Keywords |
Animals; Animals, Wild; Conservation of Natural Resources; Ecosystem; Environmental Monitoring; *Feeding Behavior; *Horses; Maryland; Plants/*growth & development; Population Dynamics; Silicon Dioxide; *Soil |
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Abstract |
The effects of grazing by feral horses on vegetation and dune topography at Assateague Island National Seashore were investigated using color-infrared imagery, lidar surveys, and field measurements. Five pairs of fenced and unfenced plots (300 m2) established in 1993 on sand flats and small dunes with similar elevation, topography, and vegetation cover were used for this study. Color-infrared imagery from 1998 and field measurements from 2001 indicated that there was a significant difference in vegetation cover between the fenced and unfenced plot-pairs over the study period. Fenced plots contained a higher percentage of vegetation cover that was dominated by American beachgrass (Ammophila breviligulata). Lidar surveys from 1997, 1999, and 2000 showed that there were significant differences in elevation and topography between fenced and unfenced plot-pairs. Fenced plots were, on average, 0.63 m higher than unfenced plots, whereas unfenced plots had generally decreased in elevation after establishment in 1993. Results demonstrate that feral horse grazing has had a significant impact on dune formation and has contributed to the erosion of dunes at Assateague Island. The findings suggest that unless the size of the feral horse population is reduced, grazing will continue to foster unnaturally high rates of dune erosion into the future. In order to maintain the natural processes that historically occurred on barrier islands, much larger fenced exclosures would be required to prevent horse grazing. |
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US Geological Survey, Center for Coastal and Watershed Studies, St. Petersburg, Florida 33701, USA. georgia.destoppelaire@my.FWC.com |
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0364-152X |
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PMID:15633024 |
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1896 |
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Loyola, E.G.; Rodriguez, M.H.; Gonzalez, L.; Arredondo, J.I.; Bown, D.N.; Vaca, M.A. |
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Title |
Effect of indoor residual spraying of DDT and bendiocarb on the feeding patterns of Anopheles pseudopunctipennis in Mexico |
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Journal Article |
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Year |
1990 |
Publication |
Journal of the American Mosquito Control Association |
Abbreviated Journal |
J Am Mosq Control Assoc |
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Volume |
6 |
Issue |
4 |
Pages |
635-640 |
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Keywords |
Animals; Anopheles/*physiology; *Carbamates; Cattle; *Ddt; Ecology; Enzyme-Linked Immunosorbent Assay; Feeding Behavior/*drug effects; Horses; Humans; Insect Vectors; Insecticide Resistance; *Insecticides; Mexico; *Phenylcarbamates; Seasons |
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Intense and persistent use of DDT for malaria control has increased resistance and induced exophilic behavior of Anopheles pseudopunctipennis. An evaluation of bendiocarb and DDT to control this species in Sinaloa, Mexico, showed that, in spite of DDT-resistance, both insecticides produced similar effects. Feeding patterns were analyzed to explain these results. Resting mosquitoes were collected over the dry and wet seasons. Anophelines were tested in an ELISA to determine the source of the meals. The human blood index (HBI) ranged from 3.3 to 6.8% in DDT- and from 12.7 to 26.9% in bendiocarb-sprayed houses. Irritability and repellency in DDT-sprayed houses could explain the reduced HBI. In contrast, bendiocarb produced higher mortality. These effects could have affected different components of the vectorial capacity and similarly reduced malaria. |
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Center for Malaria Research, Chiapas, Mexico |
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8756-971X |
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PMID:2098469 |
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Equine Behaviour @ team @ |
Serial |
2671 |
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Author |
Hoogstraal, H.; Mitchell, R.M. |
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Title |
Haemaphysalis (Alloceraea) aponommoides Warburton (Ixodoidea: Ixodidae), description of immature stages, hosts, distribution, and ecology in India, Nepal, Sikkim, and China |
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Journal Article |
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Year |
1971 |
Publication |
The Journal of Parasitology |
Abbreviated Journal |
J Parasitol |
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57 |
Issue |
3 |
Pages |
635-645 |
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Keywords |
Altitude; Animals; Artiodactyla; Birds; Buffaloes; Carnivora; Cattle; China; Deer; Dogs; Ecology; Female; Goats; Horses; Humans; India; Insectivora; Larva/anatomy & histology; Male; Mice; Nepal; Rats; Rodentia; Sciuridae; Seasons; Sheep; Tick Infestations/*epidemiology; Ticks/*anatomy & histology/growth & development |
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0022-3395 |
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PMID:5090972 |
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Call Number |
Equine Behaviour @ team @ |
Serial |
2730 |
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Author |
Gammell, M.P.; de Vries, H.; Jennings, D.J.; Carlin, C.M.; Hayden, T.J. |
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Title |
David's score: a more appropriate dominance ranking method than Clutton-Brock et al.'s index |
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Journal Article |
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Year |
2003 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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Volume |
66 |
Issue |
3 |
Pages |
601-605 |
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refbase @ user @ |
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453 |
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Author |
Hoogstraal, H.; Dhanda, V.; Bhat, H.R. |
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Title |
Haemaphysalis (Kaiseriana) davisi sp. n. (Ixodoidea: Ixodidae), a parasite of domestic and wild mammals in Northeastern India, Sikkim, and Burma |
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Journal Article |
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Year |
1970 |
Publication |
The Journal of Parasitology |
Abbreviated Journal |
J Parasitol |
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Volume |
56 |
Issue |
3 |
Pages |
588-595 |
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Keywords |
Animals; Cattle; Cattle Diseases/etiology; Deer; Ecology; Goats; Horse Diseases/etiology; Horses; India; Mammals; Myanmar; Sheep; Sheep Diseases/etiology; Tick Infestations; Ticks/*classification/isolation & purification |
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0022-3395 |
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PMID:4246255 |
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Equine Behaviour @ team @ |
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2736 |
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Author |
de Vries, H.; Stevens, J.M.G.; Vervaecke, H. |
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Title |
Measuring and testing the steepness of dominance hierarchies |
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Journal Article |
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Year |
2006 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
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71 |
Issue |
3 |
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585-592 |
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In the analysis of social dominance in groups of animals, linearity has been used by many researchers as the main structural characteristic of a dominance hierarchy. In this paper we propose, alongside linearity, a quantitative measure for another property of a dominance hierarchy, namely its steepness. Steepness of a hierarchy is defined here as the absolute slope of the straight line fitted to the normalized David's scores (calculated on the basis of a dyadic dominance index corrected for chance) plotted against the subjects' ranks. This correction for chance is an improvement of an earlier proposal by de Vries (appendix 2 in de Vries, Animal Behaviour, 1998, 55, 827-843). In addition, we present a randomization procedure for determining the statistical significance of a hierarchy's steepness, which can be used to test the observed steepness against the steepness expected under the null hypothesis of random win chances for all pairs of individuals. Whereas linearity depends on the number of established binary dominance relationships and the degree of transitivity in these relationships, steepness measures the degree to which individuals differ from each other in winning dominance encounters. Linearity and steepness are complementary measures to characterize a dominance hierarchy. |
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refbase @ user @ |
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454 |
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Author |
Klingel, H. |
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Title |
Soziale Organisation und Verhalten freilebender Steppenzebras (Equus quagga) |
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Journal Article |
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Year |
1967 |
Publication |
Zeitschrift für Tierpsychologie |
Abbreviated Journal |
Z. Tierpsychol. |
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24 |
Issue |
5 |
Pages |
580-624 |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1289 |
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Christensen, H.A.; Herrer, A. |
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Attractiveness of sentinel animals to vectors of leishmaniasis in Panama |
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Journal Article |
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1973 |
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The American Journal of Tropical Medicine and Hygiene |
Abbreviated Journal |
Am J Trop Med Hyg |
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22 |
Issue |
5 |
Pages |
578-584 |
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Keywords |
Animals; Cricetinae; Dogs; Ecology; Horses; *Insect Vectors; Leishmania/isolation & purification; Leishmaniasis, Mucocutaneous/*etiology; Male; Panama; *Phlebotomus; Rats |
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0002-9637 |
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PMID:4729738 |
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Equine Behaviour @ team @ |
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2712 |
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Meschan, E.M.; Peham, C.; Schobesberger, H.; Licka, T.F. |
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The influence of the width of the saddle tree on the forces and the pressure distribution under the saddle |
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Journal Article |
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2007 |
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The Veterinary Journal |
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173 |
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3 |
Pages |
578-584 |
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Saddle fit; Kinematics; Kinetics; Pressure; Saddletree |
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As there is no statistical evidence that saddle fit influences the load exerted on a horse's back this study was performed to assess the hypothesis that the width of the tree significantly alters the pressure distribution on the back beneath the saddle. Nineteen sound horses were ridden at walk and trot on a treadmill with three saddles differing only in tree width. Kinetic data were recorded by a sensor mat. A minimum of 14 motion cycles were used in each trial. The saddles were classified into four groups depending on fit. For each horse, the saddle with the lowest overall force (LOF) was determined. Saddles were classified as “too-narrow” if they were one size (2 cm) narrower than the LOF saddle, and “too-wide” if they were one size (2 cm) wider than the LOF saddle. Saddles two sizes wider than LOF saddles were classified as “very-wide”. In the group of narrow saddles, the pressure in the caudal third (walk 0.63 N/cm2 +/- 0.10; trot 1.08 N/cm2 +/- 0.26) was significantly higher compared to the LOF saddles (walk 0.50 N/cm2 +/- 0.09; trot 0.86 N/cm2 +/- 0.28). In the middle transversal third, the pressure of the wide saddles (walk 0.73 N/cm2 +/- 0.06; trot 1.52 N/cm2 +/- 0.19) and very-wide saddles (walk 0.77 N/cm2 +/- 0.06; trot 1.57 N/cm2 +/- 0.19) was significantly higher compared to LOF saddles (walk 0.65 N/cm2 +/- 0.10/ 0.63 N/cm2 +/- 0.11; trot 1.33 N/cm2 +/- 0.22/1.27 N/cm2 +/- 0.20). This study demonstrates that the load under poorly fitting saddles is distributed over a smaller area than under properly fitting saddles, leading to potentially harmful pressures peaks. |
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Admin @ knut @ |
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4349 |
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Author |
Slingerland, L.I.; Robben, J.H.; Schaafsma, I.; Kooistra, H.S. |
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Title |
Response of cats to familiar and unfamiliar human contact using continuous direct arterial blood pressure measurement |
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Journal Article |
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2008 |
Publication |
Research in Veterinary Science |
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85 |
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3 |
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575-582 |
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Behaviour; Activity; Technique; White-coat effect; Diurnal rhythm; Invasive |
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Continuous direct measurement of feline arterial blood pressure (ABP) was carried out via a modified method with percutaneous, ultrasound guided catheterization of the common carotid artery. In 21 healthy, conscious cats the ABP was measured during rest, alertness and activity. Furthermore, the ABP response to being petted by familiar and unfamiliar persons was assessed. Linear mixed modelling revealed that the mean blood pressure (MBP) in resting cats (114.6 mmHg) was lower (P < 0.001) than in alert cats (122.7 mmHg), which was lower (P < 0.001) than that of active cats (136.8 mmHg). The MBP during petting by a familiar person (144.7 mmHg) tended to be higher (P = 0.065) than that during petting by an unfamiliar person (139.4 mmHg). The MBP of active cats was lower (P = 0.003) than MBP of cats petted by a familiar person, but not different from MBP of cats petted by an unfamiliar person. The MBP returned to resting values between 16 and 20 min after the familiar person had left, whereas resting values were reached between 11 and 15 min after the unfamiliar person had left. The complications of the described method were limited considering the potential risks of continuous direct ABP measurement. In conclusion, the described technique enables accurate measurement of feline ABP, which is influenced by the cat's activity level and the familiarity of persons. |
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0034-5288 |
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Equine Behaviour @ team @ |
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4982 |
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