Published August 7, 2021 | Version dataset with additional metadata and code

Dataset from : Browsing is a strong filter for savanna tree seedlings in their first growing season

  • 1. Centre for African Ecology, School of Animal Plant and Environmental Sciences, University of Witwatersrand, Johannesburg, South Africa
  • 2. School of Animal Plant and Environmental Sciences, University of Witwatersrand, Johannesburg, South Africa
  • 3. Centre for African Ecology, School of Animal Plant and Environmental Sciences, University of Witwatersrand, Johannesburg, South Africa AND Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, United Kingdom

Description

1: Newly germinated seedlings are vulnerable to biomass removal but usually have at least six months to grow before they are exposed to dry-season fires, a major disturbance in savannas. In contrast, plants are exposed to browsers from the time they germinate, making browsing potentially a very powerful bottleneck for establishing seedlings. 2: Here we assess the resilience of seedlings of 10 savanna tree species to top-kill during the first 6 months of growth. Newly-germinated seeds from four dominant African genera from across the rainfall gradient were planted in a common garden experiment at the Wits Rural Facility and clipped at 1 cm when they were ~2, 3, 4, and 5 months old. Survival, growth, and key plant traits were monitored for the following 2.5 years. 3: Seedlings from environments with high herbivory pressure survived top-kill at a younger age than those from low-herbivore environments, and more palatable genera had higher herbivore-tolerance. Most individuals that survived were able to recover lost biomass within 12 months, but the clipping treatment affected root mass fraction and branching patterns. 4: Synthesis: The impact of early browsing as a demographic bottleneck can be predicted by integrating information on the probability of being browsed and the probability of surviving a browse event. Establishment limitation through early-browsing is an under-recognised constraint on savanna tree species distributions. Data may be used without requesting permission after the the publication of the paper

Notes

The data represent monthly survival and growth data for ~740 seedlings from 10 species under various levels of clipping. Total data rows : 3287. These were from of four common savanna tree clades: Combretum, Vachellia, Senegalia, and Detarioideae. The species: Colophospermum_mopane Combretum_apiculatum Combretum_collinum Combretum_hereroense Combretum_molle Senegalia_caffra Senegalia_mellifera Senegalia_nigrescens Vachellia_davyi Vachellia_erioloba Vachellia_exuvialis Vachellia_karroo(rbay) Vachellia_sieberiana The study was carried out at the Wits Rural Facility (WRF), a 350 ha research station of the University of the Witwatersrand, in the central savanna Lowveld area of Limpopo Province, South Africa (∼31° 06E, 24°30 S) between (September 2016) and March 2017 approximately. Data was collected by Frank Nyathi in field work. Elizabeth Telford did excavating and weighing the below-ground biomass. Stephen Young, Zemijo Kimmie, Benko Kimmie, and Zaid Kimmie did observational data collection, measuring seedlings and watching impala. Mechanisms Controlling Species Limits in a Changing World. NRF/SASSCAL Grant number 118588

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