Search

Now showing items 1-10 of 45

Ecological niche modeling of the invasive potential of Nile tilapia Oreochromis niloticus in African river systems: concerns and implications for the conservation of indigenous congenerics

Zengeya, T.A.; Robertson, M.P.; Booth, A.J.; Chimimba, C.T. (2013-06-30)

This study applied ecological niche models to determine the potential invasive range of Nile tilapia, Oreochromis niloticus, with a particular focus on river systems in southern Africa where it is now established and ...

Invasion debt – quantifying future biological invasions

Rouget, M.; Robertson, M.P.; Wilson, J.R.U.; Hui, C.; Essl, F.; Renteria, J.L.; Richardson, D.M. (John Wiley & Sons Ltd, 2016)

Aim We develop a framework for quantifying invasions based on lagged trends in invasions (‘invasion debt’) with the aim of identifying appropriate metrics to quantify delayed responses at different invasion stages – from ...

Contrasting species and functional beta diversity in montane ant assemblages

Bishop, L.R.; Robertson, M.P.; van Rensburg, B.J.; Parr, C.L. (John Wiley & Sons Ltd, 2015)

Aim Beta diversity describes the variation in species composition between sites and can be used to infer why different species occupy different parts of the globe. It can be viewed in a number of ways. First, it can be ...

Trophic ecology and persistence of invasive silver carp Hypophthalmichthys molitrix in an oligotrophic South African impoundment

Lubcker, N.; Dabrowski, J.; Zengeya, T.A.; Oberholster, P.J.; Hall, G.; Woodborne, S.; Roberston, M.P. (NISC (Pty) Ltd and Taylor & Francis, 2016)

The alien invasive silver carp Hypophthalmichthys molitrix established a self-sustaining feral population in an oligotrophic impoundment, Flag Boshielo Dam, in South Africa. The ability of this population to persist in a ...

Reconsidering environmental diversity (ED) as a biodiversity surrogacy strategy

Engelbrecht, I.; Robertson, M.; Stolz, M.; Joubert, J.W. (Elsevier Ltd., 2016)

Environmental Diversity (ED) has been proposed as a potential biodiversity surrogate for use in spatial biodiversity planning. The concept is based on the premise that differences in species composition between areas are ...

Elevation–diversity patterns through space and time: ant communities of the Maloti-Drakensberg Mountains of southern Africa

Bishop, T.R.; Robertson, M.P.; van Rensburg, B.J.; Parr, C.L. (John Wiley & Sons Ltd, 2014)

Aim Patterns of biological diversity are often investigated across space but little work has attempted to explore the consistency of such observations through time. Here, our aim was to understand the patterns of diversity ...

A standardized set of metrics to assess and monitor tree invasions

Wilson, J.R.U.; Caplat, P.; Dickie, I.A.; Hui, C.; Maxwell, B.D.; Nunez, M.A.; Pauchard, A.; Rejmanek, M.; Richardson, D.M.; Robertson, M.P.; Spear, D.; Webber, B.L.; van Wilgen, B.W.; Zenni, R.D. (Springer, 2014-03)

Scientists, managers, and policy-makers need functional and effective metrics to improve our understanding and management of biological invasions. Such metrics would help to assess progress towards management goals, ...

Understanding and managing the introduction pathways of alien taxa: South Africa as a case study

Faulkner, K.T.; Robertson, M.P.; Rouget, M.; Wilson, J.R.U. (Springer, 2016)

For the effective prevention of biological invasions, the pathways responsible for introductions must be understood and managed. However introduction pathways, particularly for developing nations, have been understudied. ...

A qualitative ecological risk assessment of the invasive Nile tilapia, Oreochromis niloticus in a sub-tropical African river system (Limpopo River, South Africa)

Zengeya, T.A.; Robertson, M.P.; Booth, A.J.; Chimimba, C.T. (John Wiley & Sons Ltd., 2013)

1. This study outlines the development of a qualitative risk assessment method and its application as a screening tool for determining the risk of establishment and spread of the invasive Nile tilapia, Oreochromis niloticus ...

Ant assemblages have darker and larger members in cold environments

Bishop, T.R.; Robertson, M.P.; Gibb, H.; van Rensburg, B.J.; Braschler, B.; Chown, S.L.; Foord, S.H.; Munyai, T.C.; Okey, I.; Tshivhandekano, P.G.; Werenkraut, V.; Parr, C.L. (John Wiley & Sons Ltd, 2016)

Aim In ectotherms, the colour of an individual’s cuticle may have important thermoregulatory and protective consequences. In cool environments, ectotherms should be darker, to maximize heat gain, and larger, to minimize ...

1
2
3
4
. . .
5