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Ken Norris
Zoological Society of London
BiodiversityHabitatEcologyPopulationBiology
128Publications
39H-index
7,011Citations
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Publications 124
Newest
#1Alexa Varah (ZSL: Zoological Society of London)H-Index: 1
#2Kwadjo Ahodo (ZSL: Zoological Society of London)H-Index: 1
Last. Ken Norris (ZSL: Zoological Society of London)H-Index: 39
view all 11 authors...
Pesticides have underpinned significant improvements in global food security, albeit with associated environmental costs. Currently, the yield benefits of pesticides are threatened as overuse has led to wide-scale evolution of resistance. Despite this threat, there are no large-scale estimates of crop yield losses or economic costs due to resistance. Here, we combine national-scale density and resistance data for the weed Alopecurus myosuroides (black-grass) with crop yield maps and an economic ...
3 CitationsSource
#1Gwen Maggs (UCL: University College London)H-Index: 1
#2Ken Norris (ZSL: Zoological Society of London)H-Index: 39
Last. Malcolm A. C. Nicoll (ZSL: Zoological Society of London)H-Index: 2
view all 8 authors...
Abstract The provision of supplementary food is widely used in the management of endangered species. Typically, food is provided ad libitum and often without a planned exit strategy, which can be costly. The role supplementary food plays within population demography can be challenging to identify and therefore any reduction must be carefully considered to avoid negative impacts. Here we investigate the role supplementary food plays within a reintroduced population of a Critically Endangered pass...
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#1Nathalie Pettorelli (ZSL: Zoological Society of London)H-Index: 30
#2Jennifer E. Smith (ZSL: Zoological Society of London)
Last. Ken Norris (ZSL: Zoological Society of London)H-Index: 39
view all 5 authors...
The redistribution of species in response to climate change is expected to significantly challenge environmental management and conservation efforts around the globe. To date, we have had restricted understanding of the benefits and risks that species redistribution may pose to individual countries, and a limited appreciation of the variability in current opportunities for developing effective monitoring approaches that build on existing national frameworks. To assess the present level of ecolog...
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#1Alexandra C. Morel (Environmental Change Institute)H-Index: 9
#2Michael Adu SasuH-Index: 1
Last. Yadvinder Malhi (Environmental Change Institute)H-Index: 93
view all 13 authors...
Terrestrial net primary productivity (NPP) is an important metric of ecosystem functioning; however, there are little empirical data on the NPP of human-modified ecosystems, particularly smallholder, perennial crops like cocoa (Theobroma cacao), which are extensive across the tropics. Human-appropriated NPP (HANPP) is a measure of the proportion of a natural system's NPP that has either been reduced through land-use change or harvested directly and, previously, has been calculated to estimate th...
Source
#1Alexandra C. Morel (Environmental Change Institute)H-Index: 9
#2Mark Hirons (Environmental Change Institute)H-Index: 7
Last. Ken Norris (ZSL: Zoological Society of London)H-Index: 39
view all 13 authors...
Cocoa yields in Ghana remain low. This has variously been attributed to low rates of fertiliser application, pollinator limitation and particularly dry growing conditions. In this paper we use an African forest-agriculture landscape dominated by cocoa (Theobroma cacao) to develop an ecological production function, allowing us to identify key ecological and management limits acting on cocoa yields simultaneously. These included more consistent application of fertilisers inter-annually, distributi...
1 CitationsSource
#1Alexandra C. MorelH-Index: 9
#2Mark HironsH-Index: 7
Last. Ken NorrisH-Index: 39
view all 14 authors...
Smallholder farmers dependent on rain-fed agriculture are particularly vulnerable to extreme climate events and, therefore, it is necessary to identify adaptive measures that would increase farmer resilience to these shocks. The management options in a low-input system, like forest coffee (Coffea arabica), are limited and there are several factors out of farmers' control driving their vulnerability to changing climatic conditions. These can relate to social structures and landscape factors, whic...
1 CitationsSource
#1Mark Hirons (Environmental Change Institute)H-Index: 7
#2Elizabeth J. Z. Robinson (University of Reading)H-Index: 18
Last. Ken Norris (ZSL: Zoological Society of London)H-Index: 39
view all 11 authors...
This paper examines the linkages between cash-crop income and other dimensions of poverty to interrogate assumptions regarding the relationship between agricultural income and poverty alleviation. The analysis treats poverty as a multi-dimensional and socially disaggregated phenomenon. The paper employs a mixed methods approach to case studies of Ghana and Ethiopia to explore two critical issues. First, how income from cash crops is linked with other dimensions of poverty. Second, how income and...
5 CitationsSource
#1Mark Hirons (Environmental Change Institute)H-Index: 7
#2Emily Boyd (Lund University)H-Index: 32
Last. Ken Norris (ZSL: Zoological Society of London)H-Index: 39
view all 8 authors...
Abstract This paper aims to contribute to the ongoing conceptual development and practical pursuit of resilience, the ability to absorb and respond to shocks, in an agricultural and climate change context. It builds on work that aims to dissolve the nature-society dualism and naturalisation of power relations inherent in systems thinking by developing and extending a framework originally conceived to integrate research on biological and cultural diversity. The resultant ‘biocultural’ framework e...
4 CitationsSource
#1Mark Hirons (University of Oxford)H-Index: 7
#2Z. Mehrabi (UBC: University of British Columbia)H-Index: 1
Last. Ken NorrisH-Index: 39
view all 12 authors...
Abstract This paper provides a multi-scalar examination of the Ethiopian coffee sector and its pursuit of climate resilience. Concern is growing about the potential impact of climate change on Arabica coffee in Ethiopia and the 25 million livelihoods it supports. Arabica coffee has a relatively narrow envelope of climatic suitability and recent studies suggest that the area of bioclimatically suitable space for the species in its native Ethiopia could decline dramatically in the coming decades. ...
7 CitationsSource
#1Helen L. Hicks (University of Sheffield)H-Index: 3
#2David Comont (Rothamsted Research)H-Index: 5
Last. Robert P. Freckleton (University of Sheffield)H-Index: 58
view all 9 authors...
Repeated use of xenobiotic chemicals has selected for the rapid evolution of resistance, threatening health and food security at a global scale. Strategies for preventing the evolution of resistance include cycling and mixtures of chemicals and diversification of management. We currently lack large-scale studies that evaluate the efficacy of these different strategies for minimizing the evolution of resistance. Here we use a national-scale data set of occurrence of the weed Alopecurus myosuroide...
19 CitationsSource
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