OpenUCT Home
→
Browsing by Author

Browsing by Author "Altwegg, Res"

Now showing items 1-20 of 26

Next Page

Behavioural, microhabitat, and phylogenetic dimensions of intrasexual contest competition in combatant monkey beetles (Scarabaeidae: Hopliini)

Author: Rink, Ariella N Date: 2021 The importance of sexual selection as a driver of evolution, from microevolution to speciation, has overwhelmingly been studied in the context of female choice, but there is evidence that male-male competition can also drive evolution. Recent ... Read more
Calling ecology of micro frogs (Microbatrachella capensis): a case study using acoustic spatial capture recapture

Author: Gedert, Jennifer Date: 2020 Amphibians worldwide are declining, increasing the demand for monitoring populations of many threatened amphibians, including the South African Critically Endangered micro frog (Microbatrachella capensis). I attempted to improve ongoing ... Read more
Citizen science reveals complex changes in barn swallow phenology in South Africa over three decades

Author: Burman, Marc Sebastian Date: 2016 Palearctic migrants, including barn swallows Hirundo rustica, responded to climate change in Europe from the mid to late 1900s with phenological changes, mostly showing earlier arrival and start of breeding. During this period, barn swallows ... Read more
Demographic and genetic variability in Cape Dwarf Chameleons, Bradypodion pumilum, withink a fragmented, urban habitat

Author: Katz, Eric Michael Date: 2012 Habitat fragmentation is recognized as a primary cause of biodiversity loss. To maximize biodiversity maintenance, researchers in the field of conservation biology often investigate population demography and genetic variability for species ... Read more
Departures from the energy-biodiversity relationship in south african passerines: are the legacies of past climates mediated by behavioral constraints on dispersal?

Author: Péron, Guillaume ; Altwegg, Res Date: 2015 Legacies of paleoclimates in contemporary biodiversity patterns have mostly been investigated with global datasets, or with weakly dispersive organisms, and as a consequence been interpreted in terms of geographical or physical constraints. ... Read more c b
Does seasonality drive spatial patterns in demography? Variation in survival in African reed warblers Acrocephalus baeticatus across southern Africa does not reflect global patterns

Author: Jansen, Dorine Y.M. ; Abadi, Fitsum ; Harebottle, Doug ; Altwegg, Res Date: 2014 Among birds, northern temperate species generally have larger clutches, shorter development periods and lower adult survival than similarly-sized southern and tropical species. Even though this global pattern is well accepted, the driving ... Read more c b
Drivers of bird species richness within moist high-altitude grasslands in eastern South Africa

Author: Maphisa, David H ; Smit-Robinson, Hanneline ; Underhill, Les G ; Altwegg, Res Date: 2016 Moist high-altitude grasslands in South Africa are renowned for high avifaunal diversity and are priority areas for conservation. Conservation management of these areas conflicts with management for other uses, such as intensive livestock ... Read more c b
The effects of colony dynamics and climate on a declining population of sociable weavers, Phlietairus Socius

Author: Marais, Michael Date: 2010 Read more
Effects of protected areas and climate change on the occupancy dynamics of common bird species in South Africa

Author: Duckworth, Greg Date: 2018 Protected areas are tracts of land set aside primarily for the conservation of biodiversity and natural habitats. They are intended to mitigate biodiversity loss caused by land-use change worldwide. Climate change has been shown to disrupt ... Read more
Efficient Bayesian analysis of occupancy models with logit link functions

Author: Clark, Allan E ; Altwegg, Res Date: 2018 Occupancy models (Ecology, 2002; 83: 2248) were developed to infer the probability that a species under investigation occupies a site. Bayesian analysis of these models can be undertaken using statistical packages such as WinBUGS, OpenBUGS, ... Read more c b
An experimental approach to assess the role of nest predation in the population dynamics of the sociable weaver (Philetairus socius)

Author: Lloyd, Kyle Date: 2016 Predation is a widespread population process that has been shown to affect the distribution, abundance and dynamics of populations in ecosystems. This is the first study that used an experimental approach to assess the effect of nest predation ... Read more
Fishery, population dynamics and stock assessment of geelbek (Atractoscion aequidens), a commercially important migrant fish species off the coast of South Africa

Author: Boyd, Danielle Winona Date: 2018 Geelbek (Atractoscion aequidens) is an important fish species in South Africa's linefishery, a fishing sector defined by its fishing gear of rod and reel or handline. Distributed from Cape Point (34°21'S, 18°29'E) on the south west coast to ... Read more
Foraging efficiencies and species' distributions : an explanation of the Hadeda ibis (Bostrychia hagedash) in relation to soil moisture

Author: Duckworth, Greg Date: 2008 The influence of soil moisture on the foraging time needed to meet BMR (foraging efficiency) in hadedas was explored in Cape Town, South Africa. This was done by monitoring hadedas foraging and recording the prey items eaten successfully per ... Read more
From both sides: dire demographic consequences of carnivorous mice and longlining for the critical endangered Tristan albatrosses on Gough Island

Author: Wanless, Ross M ; Ryan, Peter G ; Altwegg, Res ; Angel, Andrea ; Cooper, John ; Cuthbert, Richard ; Hilton, Geoff M Date: 2009 The IUCN recently uplisted the Tristan albatross (Diomedea dabbenena) to Critically Endangered. Here we present new data indicating negative population trends on Gough Island arising from low adult survival (∼91%, ascribed to accidental ... Read more
Geographic range dynamics of South Africa's bird species

Author: Loftie-Eaton, Megan Date: 2014 A key issue in species conservation is a knowledge of the geographic ranges of species, and how these are changing through time. For birds there is a special opportunity to undertake studies of range changes, making use of the data collected ... Read more
Martial eagles and the national power grid in South Africa: the implications of pylon-nesting for conservation management

Author: Berndt, Jessie Date: 2015 Many large, sparsely distributed raptors are threatened by a host of anthropogenic factors, while a minority may actually benefit from some aspects of development and environmental change. Clarity on the size and trajectory of such populations ... Read more
Modelling the range-wide density patterns of the Arthroleptella lightfooti using acoustic monitoring data

Author: Poongavanan, Jenicca Date: 2019 Species distributions are often limited by environmental factors and according to the abundant—centre hypothesis, abundance should be highest Where the environment is most favourable for the species. So, do the same environmental factors ... Read more
Movement of the Cape dwarf chameleon (Bradypodion pumilum): are they vulnerable to habitat fragmentation?

Author: Rebelo, Alexander Douglas Date: 2014 Habitat fragmentation threatens the persistence of natural populations globally. Dispersal between populations can mitigate the negative impacts of habitat fragmentation. The Cape dwarf chameleon (Bradypodion pumilum) occupies heavily fragmented ... Read more
Phenological changes in the Southern Hemisphere

Author: Chambers, Lynda E ; Altwegg, Res ; Barbraud, Christophe ; Barnard, Phoebe ; Beaumont, Linda J ; Crawford, Robert J M ; Durant, Joel M ; Hughes, Lesley ; Keatley, Marie R ; Low, Matt Date: 2013 Current evidence of phenological responses to recent climate change is substantially biased towards northern hemisphere temperate regions. Given regional differences in climate change, shifts in phenology will not be uniform across the globe, ... Read more c b
Revisiting the effect of capture heterogeneity on survival estimates in capture-mark-recapture studies: does it matter?

Author: Abadi, Fitsum ; Botha, Andre ; Altwegg, Res Date: 2013 Recently developed capture-mark-recapture methods allow us to account for capture heterogeneity among individuals in the form of discrete mixtures and continuous individual random effects. In this article, we used simulations and two case ... Read more c b

Now showing items 1-20 of 26

Next Page

Browse

All of OpenUCT