Search Results - "Grant, Rina"

Forage quality of savannas — Simultaneously mapping foliar protein and polyphenols for trees and grass using hyperspectral imagery by Skidmore, Andrew K., Ferwerda, Jelle G., Mutanga, Onisimo, Van Wieren, Sipke E., Peel, Mike, Grant, Rina C., Prins, Herbert H.T., Balcik, Filiz Bektas, Venus, Valentijn

“…Savanna covers about two-thirds of Africa, with forage quantity and quality being important factors determining the distribution and density of wildlife and…”
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Nutrient resorption patterns of plant functional groups in a tropical savanna: variation and functional significance by Ratnam, Jayashree, Sankaran, Mahesh, Hanan, Niall P, Grant, Rina C, Zambatis, Nick

“…Green and senesced leaf nitrogen (N) and phosphorus (P) concentrations of different plant functional groups in savanna communities of Kruger National Park,…”
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Large herbivores may alter vegetation structure of semi-arid savannas through soil nutrient mediation by van der Waal, Cornelis, Kool, Ada, Meijer, Seline S, Kohi, Edward, Heitkönig, Ignas M. A, de Boer, Willem F, van Langevelde, Frank, Grant, Rina C, Peel, Mike J. S, Slotow, Rob, de Knegt, Henrik J, Prins, Herbert H. T, de Kroon, Hans

“…In savannas, the tree-grass balance is governed by water, nutrients, fire and herbivory, and their interactions. We studied the hypothesis that herbivores…”
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Dry season mapping of savanna forage quality, using the hyperspectral Carnegie Airborne Observatory sensor by Knox, Nichola M., Skidmore, Andrew K., Prins, Herbert H.T., Asner, Gregory P., van der Werff, Harald M.A., de Boer, Willem F., van der Waal, Cornelis, de Knegt, Hendrik J., Kohi, Edward M., Slotow, Rob, Grant, Rina C.

“…Forage quality within an African savanna depends upon limiting nutrients (nitrogen and phosphorus) and nutrients that constrain the intake rates…”
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When less is more: heterogeneity in grass patch height supports herbivores in counter-intuitive ways by Grant, Rina CC, Botha, Judith, Grant, Thelani C, Peel, Mike JS, Smit, Izak PJ

“…Herbivores are an integral part of the African landscape and have evolved with the vegetation to create the savanna landscape. Managers of these landscapes can…”
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Water and Nutrients Alter Herbaceous Competitive Effects on Tree Seedlings in a Semi-Arid Savanna by van der Waal, Cornelis, de Kroon, Hans, de Boer, Willem F., Heitkönig, Ignas M. A., Skidmore, Andrew K., de Knegt, Henrik J., van Langevelde, Frank, van Wieren, Sipke E., Grant, Rina C., Page, Bruce R., Slotow, Rob, Kohi, Edward M., Mwakiwa, Emmanuel, Prins, Herbert H. T.

“…1. Globally, both climatic patterns and nitrogen deposition rates show directional changes over time. It is uncertain how woody seedlings, which coexist with…”
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ELEPHANT (LOXODONTA AFRICANA) DIETS IN KRUGER NATIONAL PARK, SOUTH AFRICA: SPATIAL AND LANDSCAPE DIFFERENCES by Codron, Jacqui, Lee-Thorp, Julia A., Sponheimer, Matt, Codron, Daryl, Grant, Rina C., de Ruiter, Darryl J.

“…African elephants (Loxodonta africana) are mixed feeders, incorporating varying proportions of grass and browse into their diets. Disagreement persists as to…”
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Taxonomic, anatomical, and spatio-temporal variations in the stable carbon and nitrogen isotopic compositions of plants from an African savanna by Codron, Jacqui, Codron, Daryl, Lee-Thorp, Julia A., Sponheimer, Matt, Bond, William J., de Ruiter, Darryl, Grant, Rina

“…Stable carbon ( δ 13C) and nitrogen ( δ 15N) isotope ratios are commonly used to reconstruct palaeodiets and palaeoenvironments. The method is based on our…”
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The development of a tourism research framework by South African National Parks to inform management by Biggs, Duan, Swemmer, Louise, Phillips, Glen, Stevens, Joep, Freitag, Stefanie, Grant, Rina

“…Tourism is critical source of financing for conservation in Africa. South African National Parks (SANParks) raises in excess of 80% of their own funds through…”
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Soil nutrient status determines how elephant utilize trees and shape environments by Pretorius, Yolanda, de Boer, Willem F., van der Waal, Cornelis, de Knegt, Henjo J., Grant, Rina C., Knox, Nicky M., Kohi, Edward M., Mwakiwa, Emmanuel, Page, Bruce R., Peel, Mike J. S., Skidmore, Andrew K., Slotow, Rob, van Wieren, Sipke E., Prins, Herbert H. T.

“…1. Elucidation of the mechanism determining the spatial scale of patch selection by herbivores has been complicated by the way in which resource availability…”
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Why elephant have trunks and giraffe long tongues: how plants shape large herbivore mouth morphology by Pretorius, Yolanda, de Boer, Willem F., Kortekaas, Kim, van Wijngaarden, Machiel, Grant, Rina C., Kohi, Edward M., Mwakiwa, Emmanuel, Slotow, Rob, Prins, Herbert H. T.

“…We investigated whether mass and morphological spatial patterns in plants possibly induced the development of enlarged soft mouth parts in especially…”
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Scale of nutrient patchiness mediates resource partitioning between trees and grasses in a semi-arid savanna by van der Waal, Cornelis, de Kroon, Hans, Heitkönig, Ignas M. A., Skidmore, Andrew K., van Langevelde, Frank, de Boer, Willem F., Slotow, Rob, Grant, Rina C., Peel, Mike P. S., Kohi, Edward M., de Knegt, Henrik J., Prins, Herbert H. T.

“…1. Scaling theory predicts that organisms respond to different scales of resource patchiness in relation to their own size. We tested the hypothesis that the…”
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Ecological thresholds in the savanna landscape: developing a protocol for monitoring the change in composition and utilisation of large trees by Druce, Dave J, Shannon, Graeme, Page, Bruce R, Grant, Rina, Slotow, Rob

“…Acquiring greater understanding of the factors causing changes in vegetation structure -- particularly with the potential to cause regime shifts -- is…”
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Evaluating herbivore management outcomes and associated vegetation impacts by Grant, Rina C.C., Peel, Mike J.S., Bezuidenhout, Hugo

“…African savannas are characterised by temporal and spatial fluxes that are linked to fluxes in herbivore populations and vegetation structure and composition…”
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Effects of simulated browsing on growth and leaf chemical properties in Colophospermum mopane saplings by Kohi, Edward M, de Boer, Willem F, Slot, Martijn, van Wieren, Sipke E, Ferwerda, Jelle G, Grant, Rina C, Heitkönig, Ignas M.A, de Knegt, Henjo J, Knox, Nicky, van Langevelde, Frank, Peel, Mike, Slotow, Rob, van der Waal, Cornelis, Prins, Herbert H.T

“…Browsing intensity influences a plant's response to herbivory. Plants face a trade-off between investment in the production of secondary compounds and…”
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Taking stock after a decade: Does the ‘thresholds of potential concern’ concept need a socio-ecological revamp? by Biggs, Harry, Ferreira, Sam, Freitag-Ronaldson, Stefanie, Grant-Biggs, Rina

“…The concept of thresholds of potential concern (TPCs) as implemented for the last decade in strategic adaptive management in South African National Parks…”
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A strategic framework for biodiversity monitoring in South African National Parks by McGeoch, Melodie A., Dopolo, Mbulelo, Novellie, Peter, Hendriks, Howard, Freitag, Stefanie, Ferreira, Sam, Grant, Rina, Kruger, Judith, Bezuidenhout, Hugo, Randall, Rodney M., Vermeulen, Wessel, Kraaij, Tineke, Russell, Ian A., Knight, Michael H., Holness, Stephen, Oosthuizen, Ané

“…Protected areas are under increasing threat from a range of external and internal pressures on biodiversity. With a primary mandate being the conservation of…”
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Toward More Effective Benefit Sharing in South African National Parks by Swemmer, Louise, Grant, Rina, Annecke, Wendy, Freitag-Ronaldson, Stefanie

“…More examples of positive and negative outcomes of community-based conservation initiatives aimed at benefit sharing are surfacing globally, and there is…”
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Relative Impacts of Elephant and Fire on Large Trees in a Savanna Ecosystem by Shannon, Graeme, Thaker, Maria, Vanak, Abi Tamim, Page, Bruce R., Grant, Rina, Slotow, Rob

“…Elephant and fire are considered to be among the most important agents that can modify the African savanna ecosystem. Although the synergistic relationship…”
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Biocomplexity in large tree mortality: interactions between elephant, fire and landscape in an African savanna by Vanak, Abi Tamim, Shannon, Graeme, Thaker, Maria, Page, Bruce, Grant, Rina, Slotow, Rob

“…The vegetation dynamics of the savanna ecosystem are driven by complex interactions between biotic and abiotic factors, and thus are expected to exhibit…”
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