1 |
Lek-breeding in Kafue lechweNefdt, Rory John Charlton January 1992 (has links)
No description available.
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2 |
Influences on mating behaviour and reproductive success in the OdonataConvey, Peter January 1987 (has links)
No description available.
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3 |
Polymorphism and population ecology of the European maple aphid, Periphyllus testudinaceus (Fernie)Shearer, John W. January 1976 (has links)
No description available.
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4 |
The co-operative breeding behaviour of the long-tailed tit (Aegithalos caudatus)Glen, N. W. January 1985 (has links)
No description available.
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5 |
Studies on the social and sexual behaviour of bullsBlockey, Michael Anthony de Burgh January 1975 (has links) (PDF)
A very high proportion of beef cows in Australia are mated to bulls at pasture. A multiplicity of systems for pasture mating are presently in use. Bulls are mated singly or in groups, they are set-stocked during the mating period or rotated about the different groups of cows, they are mated at the rate of 2, 3, 4, 5 or 6 bulls per 100 cows, young bulls are mated to cows in company with old bulls or other young bulls (Dickson 1966). There is little scientific basis for any of these mating systems since basic information on the sexual and social behaviour of beef bulls at pasture is lacking. Such data are needed so that optimum use can be made of beef bulls in pasture mating. (For complete abstract open document)
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6 |
Aspects of the breeding behaviour of Queckett's river frog (Amietia quecketti) / Lize BrownBrown, Lize January 2015 (has links)
Acoustic communication in anurans plays a critical role in species recognition, defending
territories and resources, and finding a mate. Anurans use a number of different call note types to
communicate, from which the most notable are advertisement- and aggression calls. Optimum
weather conditions are a precursor to the commencement of the breeding season for all frog
species and their calling behaviour is therefore readily influenced by atmospheric conditions.
Male frogs within a chorus also tend to call from territories within a specific range of distances
from one another. The objectives of this study were to 1) determine a possible context in which
call note types are produced, 2) to determine the effect of atmospheric conditions on calling
behaviour and 3) to determine the spacing distances between males and females in a chorus of
Queckett’s River Frog (Amietia quecketti). Pre-recorded note types were used in a playback
experiment to determine a context for elicited responses. A context was derived for six of the
responses. Advertisement (clicks and whines), aggression (creaks), encounter (tonal notes),
territorial (whine-tonal notes), and release calls (squeaks) were described. Calls and atmospheric
conditions were recorded and correlated for an entire breeding season. Water temperature, wind
speed, humidity and barometric pressure had a significant effect on calling intensity. As water
temperature decreased calling intensity increased, while increased wind temperature led to
increased calling intensity. Amietia quecketti calls from the water, explaining the effect while
increased wind speed decreases water temperature and can carry sound further. Both humidity
and barometric pressure showed increased calling intensity only at specific levels. Humidity and
barometric pressure have a direct effect on one another, which most likely causes the correlation
between calling intensity and both these variables. In this study A. quecketti was shown to have
breeding ponds for males and resting ponds and positions for non-gravid females. This prevents
unwanted or unnecessary amplexus. Males showed much smaller and less variable territory sizes
than females. This is most likely because males have a small range of optimal spacing distance
while females move towards and away from males. The presence of vegetation resulted in
smaller territories. This is possibly because smaller males act as satellite males and cannot be
seen by larger males in vegetation. The size of males did not affect territory size. Males have a
specific inter-male spacing distance regardless of size. / MSc (Environmental Sciences), North-West University, Potchefstroom Campus, 2015
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7 |
Aspects of the breeding behaviour of Queckett's river frog (Amietia quecketti) / Lize BrownBrown, Lize January 2015 (has links)
Acoustic communication in anurans plays a critical role in species recognition, defending
territories and resources, and finding a mate. Anurans use a number of different call note types to
communicate, from which the most notable are advertisement- and aggression calls. Optimum
weather conditions are a precursor to the commencement of the breeding season for all frog
species and their calling behaviour is therefore readily influenced by atmospheric conditions.
Male frogs within a chorus also tend to call from territories within a specific range of distances
from one another. The objectives of this study were to 1) determine a possible context in which
call note types are produced, 2) to determine the effect of atmospheric conditions on calling
behaviour and 3) to determine the spacing distances between males and females in a chorus of
Queckett’s River Frog (Amietia quecketti). Pre-recorded note types were used in a playback
experiment to determine a context for elicited responses. A context was derived for six of the
responses. Advertisement (clicks and whines), aggression (creaks), encounter (tonal notes),
territorial (whine-tonal notes), and release calls (squeaks) were described. Calls and atmospheric
conditions were recorded and correlated for an entire breeding season. Water temperature, wind
speed, humidity and barometric pressure had a significant effect on calling intensity. As water
temperature decreased calling intensity increased, while increased wind temperature led to
increased calling intensity. Amietia quecketti calls from the water, explaining the effect while
increased wind speed decreases water temperature and can carry sound further. Both humidity
and barometric pressure showed increased calling intensity only at specific levels. Humidity and
barometric pressure have a direct effect on one another, which most likely causes the correlation
between calling intensity and both these variables. In this study A. quecketti was shown to have
breeding ponds for males and resting ponds and positions for non-gravid females. This prevents
unwanted or unnecessary amplexus. Males showed much smaller and less variable territory sizes
than females. This is most likely because males have a small range of optimal spacing distance
while females move towards and away from males. The presence of vegetation resulted in
smaller territories. This is possibly because smaller males act as satellite males and cannot be
seen by larger males in vegetation. The size of males did not affect territory size. Males have a
specific inter-male spacing distance regardless of size. / MSc (Environmental Sciences), North-West University, Potchefstroom Campus, 2015
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