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Browsing by Author "Jacobs, David S"

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Animal personality and biological markets: rise of the individual

Author: Jacobs, David S Date: 2009 The last decade has seen the emergence of two new developments in behavioural ecology: the discovery of animal personalities and a new approach to the analyses of animal behaviour, biological markets. Although both regard individual differences ... Read more
Behavioural evidence for the perception of individual identity and gender via the echolocation calls of a high duty cycle bat, Rhinolophus clivosus

Author: Finger, Nikita Maxine Date: 2015 Different cognitive processes underlie the perception of vocalizations in many mammals, including humans. This perception now extends to a highly specialized form of sonar called echolocation. In habituation-dishabituation experiments, a high ... Read more
Characterization of transcripts expressed from the Meis2 locus in the Natal Long-fingered bat (Miniopterus natalensis)

Author: Curry, Lyle Date: 2014 The Myeloid ecotropic insertion site 2 (Meis2) gene is an important transcriptional regulator involved in the pattering of the limb during vertebrate development. In the forelimbs (wings) of bats the expression Meis2 was shown to be differentially ... Read more
Cross-species microarray analysis of limb development in the bat, Miniopterus natalensis

Author: Mason, Mandy K Date: 2009 This study reports the first characterisation of the embryonic bat limb transcriptome, allowing the identification of novel candidate genes that were differentially expressed between the bat hand and foot plate. These genes may have played ... Read more
The defensive role of ultrasonic moth clicks against bat predation : a mathematical modeling approach

Author: Ribeiro, Daniel De Lemos Date: 2007 Some moths emit ultrasonic clicks in response to bat echolocation calls. These clicks are believed to serve as a defence mechanism against bat predation by means of jamming, aposematism or startle. By assessing the characteristics and variation ... Read more
Ecomorphological differences between sister species, Rhinolophus capensis and Rhinolophus swinnyi

Author: Kelly, Elizabeth Jane Date: 2008 Phenotypic analyses of sibling species provide the opportunity to examine divergence that is caused by adaptation rather than phylogenetic history. Rhinolophus capensis and Rhinolophus swinnyi diverged from a common ancestor between 15 and ... Read more
Environmental correlates of geographic divergence in a phenotypic trait: A case study using bat echolocation

Author: Maluleke, Tinyiko ; Jacobs, David S ; Winker, Henning Date: 28 Jun 2017 Divergence in phenotypic traits may arise from the interaction of different evolutionary forces, including different kinds of selection (e.g., ecological), genetic drift, and phenotypic plasticity. Sensory systems play an important role in ... Read more c b
Environmental factors influencing the distribution of bats (Chiroptera) in South Africa

Author: Salata, Hassan Aburaida Babiker Date: 2012 Environmental factors limiting the distribution of 37 of the 56 bat species in a warm temperate region (South Africa) were determined using GIS software and the Maximum Entropy modelling technique (MaxEnt). Undertaking such a study in a warm ... Read more
Factors affecting the activity patterns of Myotis tricolor (Chiroptera: Vespertilionidae)

Author: Jordaan, Stacey Date: 2011 Foraging behaviour is an important component of an animal’s ecology. Increases in energetic costs associated with reproduction, should have marked effects on foraging behaviour, but may be compounded by the effects of environmental factors. ... Read more
Factors affecting the emergence times of seven sympatric insectivorous bat species

Author: Thomas, Alicia Jessica Date: 2011 The onset of activity in animals restricted to being active for only part of the day, is one of the most fundamental aspects of their biology. Onset of activity is likely subject to several factors including presence/absence of predators and ... Read more
Geographic distribution and composition of the parasite assemblage of the insectivorous bat, Miniopterus natalensis (Chiroptera: Miniopteridae), in South Africa

Author: Wood, Simon Date: 2012 All free-living animal species have their own unique parasite assemblages. These parasites can have a significant impact on the fitness and ecology of their hosts, and through them the ecological systems in which they occur. Gaining knowledge ... Read more
Geographic variation in the echolocation calls of the endemic Cape horseshoe bat, Rhinolophus capensis (Chiroptera: Rhinolophidae)

Author: Odendaal, Lizelle Janine Date: 2009 Several intrinsic (body size) and extrinsic (foraging ecology and communication) factors are suggested to influence call frequency divergence in high duty-cycle bats. Investigating these factors within the framework of established hypotheses ... Read more
Geographic variation in the phenotypes of two sibling horseshoe bats Rhinolophus simulator and R.swinnyi

Author: Mutumi, Gregory L Date: 2016 The study of geographic variation and its causes in the phenotypes of animals elucidates how evolutionary processes generate biodiversity. This thesis attempts to uncouple the relative contributions of adaptive and neutral mechanisms to ... Read more
Habitat correlates of pulse parameters in the highly specialised acoustic system of Chiroptera

Author: Finger, Nikita Maxine Date: 2021 High Duty Cycle echolocating bats use high frequency echolocation pulses that have limited range but are clutter resistant i.e. can detect targets in dense clutter (the number of echoes produced other than those from the target of interest). ... Read more
The influence of foraging habitat on acoustic signal source levels in two bat species, Neoromicia capensis (Vespertilionidae) and Tadarida aegyptiaca (Molossidae)

Author: Mutavhatsindi, Itani Victor Date: 2018 The source level of echolocation pulses is an essential parameter because it has an impact on the range at which bats perceive their environment and, most importantly, at which they detect prey. Echolocation pulse source level is under the ... Read more
Investigation of population abundance, distribution, and population linkage of Indo-Pacific Bottlenose Dolphins (Tursiops aduncus) on the north and south of Zanzibar using mark-recapture and acoustic methods

Author: St Clair-Hughes, Adam James Victor Date: 2017 Previous studies, using a variety of methods such as photographic identification, fisheries observer programs, or genetic testing, on Indo-Pacific bottlenose dolphins (Tursiops aduncus) around Zanzibar Island, Tanzania, suggest separate ... Read more
Limbs gone batty : the role of the anterior-posterior patterning signal, Sonic Hedgehog, in the development of the unique bat limb

Author: Hockman, Dorit Date: 2007 The unique skeletal structure of the bat forelimb and hindlimb provides a new and exciting model for the field of evolutionary developmental biology, which seeks to reveal the molecular mechanisms behind vertebrate limb diversity. The digits ... Read more
Local adaptation of Geoffroy's horseshoe bat, Rhinolophus clivosus, to the Cape floristic region of South Africa

Author: Walker, Maryalice Harkins Date: 2006 Populations of species adapt to the environment in which they live. This study investigated local adaptation in Rhinolophus clivosus (Chiroptera: Rhinolophidae) by comparing its phenotype with that of a co-occurring endemic species. R. capensis, ... Read more
Molecular phylogenetics and the evolution of high-frequency echolocation in horseshoe bats (Genus Rhinolophus)

Author: Stoffberg, Samantha Date: 2007 Horseshoe bats (genus Rhinolophus) belong to the Old World family Rhinolophidae. They are high-duty cycle bats and many species use echolocation calls dominated by high frequencies (above 60 kHz). Much is known about how they use their ... Read more
Phenotypic convergence in genetically distinct lineages of a Rhinolophus species complex (Mammalia, Chiroptera)

Author: Jacobs, David S ; Babiker, Hassan ; Bastian, Anna ; Kearney, Teresa ; Eeden, Rowen van ; Bishop, Jacqueline M Date: 2013 Phenotypes of distantly related species may converge through adaptation to similar habitats and/or because they share biological constraints that limit the phenotypic variants produced. A common theme in bats is the sympatric occurrence of ... Read more c b

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