5 Works

Data from: Bottom-up effects of a no-take zone on endangered penguin demographics

Richard B. Sherley, Henning Winker, Res Altwegg, Carl D. Van Der Lingen, Stephen C. Votier & Robert J. M. Crawford
Marine no-take zones can have positive impacts for target species and are increasingly important management tools. However, whether they indirectly benefit higher order predators remains unclear. The endangered African penguin (Spheniscus demersus) depends on commercially exploited forage fish. We examined how chick survival responded to an experimental 3-year fishery closure around Robben Island, South Africa, controlling for variation in prey biomass and fishery catches. Chick survival increased by 18% when the closure was initiated, which...

Data from: Crowdsourcing the identification of organisms: a case-study of iSpot

Jonathan Silvertown, Martin Harvey, Richard Greenwood, Mike Dodd, Jon Rosewell, Tony Rebelo, Janice Ansine & Kevin McConway
Accurate species identification is fundamental to biodiversity science, but the natural history skills required for this are neglected in formal education at all levels. In this paper we describe how the web application ispotnature.org and its sister site ispot.org.za (collectively, "iSpot") are helping to solve this problem by combining learning technology with crowdsourcing to connect beginners with experts. Over 94% of observations submitted to iSpot receive a determination. To date (2014), iSpot has crowdsourced the...

Data from: Local adaptation: mechanical fit between floral ecotypes of Nerine humilis (Amaryllidaceae) and pollinator communities

Ethan Newman, John Manning & Bruce Anderson
Geographic variation in floral morphology is often assumed to reflect geographic variation in pollinator communities and associated divergence in selective pressures. We studied populations of Nerine humilis (Amaryllidaceae) to assess whether geographic variation in floral form is the result of local adaptation to different pollinator communities. We first tested for associations between floral traits and visitor communities, and found that populations with similar floral morphologies were visited by similar insect communities. Mean style length in...

Data from: Topography as a driver of diversification in the Cape Floristic Region of South Africa

George Anthony Verboom, Nicola G. Bergh, Sarah A. Haiden, Vera Hoffmann & Matthew N. Britton
The rugged topography of the Cape Floristic Region (CFR), South Africa, is frequently invoked to explain the spectacular radiation of the Cape flora, but the mechanisms involved remain unclear. Where recent authors emphasize the importance of elevation gradients as stimuli for ecological speciation, earlier workers stressed the role of topography as an isolating mechanism, particularly in montane lineages. Using six Cape plant lineages, we tested whether elevation niches are phylogenetically conserved. We then assessed whether...

Data from: Natural vegetation benefits synergistic control of the three main insect and pathogen pests of fruit crop in southern Africa

Dominic C. Henri, Owen Jones, Ariana Tsiattalos, Elisa Th├ębault, Colleen L. Seymour & F. J. Frank Van Veen
1. Most studies of the potential for natural habitat to improve agricultural productivity have been conducted in transformed, temperate regions, but little is known of the importance of agroecosystem services in biodiverse developing countries. 2. Natural vegetation may promote the density and/or diversity of natural enemies of crop pests, but the strength of the effect varies, and few studies directly measure concurrent impacts on pest density. Considering multiple pest species within the same agroecosystem may...

Registration Year

  • 2015
    5

Resource Types

  • Dataset
    5

Affiliations

  • South African National Biodiversity Institute
    5
  • University of Cape Town
    2
  • University of Exeter
    2
  • Department of Agriculture
    1
  • University of Edinburgh
    1
  • University of KwaZulu-Natal
    1
  • Stellenbosch University
    1
  • The Open University
    1