9 Works

Raw data used for analysis of parental care from video footage of breeding Cape Rockjumpers (Chaetops frenatus), from the Western Cape of South Africa

Krista Oswald
Demonstrated negative effects of increased temperatures on avian reproductive success suggest a mechanism by which climate change may impact species persistence. High temperatures can result in reduced parental care and reduced nestling condition in passerines with dependent young, resulting in lowered fledging success and population recruitment. We examined provisioning rate and nestling condition in a South African mountain endemic, the Cape Rockjumper Chaetops frenatus, whose population declines correlate with warming habitat. Our aim was to...

Historical and contemporary records of the invasive mussel Mytilus galloprovincialis in southern Africa

Kevin C. K. Ma, Molline N. C. Gusha, Gerardo I. Zardi, Katy R. Nicastro, Jonathan R. Monsinjon & Christopher D. McQuaid
This dataset contains data described in the paper entitled "Biogeographic drivers of distribution and abundance in an alien ecosystem engineer: Transboundary range expansion, barriers to spread, and spatial structure". Data include: (1) historical and contemporary records of the invasive mussel Mytilus galloprovincialis to re-construct its invasion history and patterns of spread across biogeographic regions of southern Africa; (2) densities of M. galloprovincialis at different shore heights measured from multiple sites across South Africa; (3) semi-quantitative...

Sperm competition risk affects ejaculate strategy in terms of sperm number but not sperm size in squid

Yoko Iwata, Noriyosi Sato, Noritaka Hirohashi, Yoshiro Watanabe, Warwick Sauer & Paul Shaw
In polygamous species, the mode of sperm storage in females influences evolution of sperm quantitative and qualitative traits because it provides the arena for sperm competition, cryptic female choice and fertilization processes. In this study, we compared ejaculate traits of two squid species, Heterololigo bleekeri and Loligo reynaudii. Both species show dimorphic sperm traits associated with alternative reproductive tactics where consort and sneaker males transfer sperm to different storage sites within a female (on the...

Data from: Weather and topography regulate the benefit of a conditionally helpful parasite

Jonathan Monsinjon, Christopher McQuaid, Katy Nicastro, Laurent Seuront, Mauricio Oróstica & Gerardo Zardi
Heat-induced mass mortalities involving ecosystem engineers may have long-lasting detrimental effects at the community level, eliminating the ecosystem services they provide. Intertidal mussels are ecologically and economically valuable with some populations facing unprecedented heat-induced mass mortalities. Critically, mussels are also frequently infested by endolithic parasites that modify shell albedo, hence reducing overheating and mortality rates under heat stress. Using a biophysical model, we explored the topographical and meteorological conditions under which endolithically-driven thermal buffering becomes...

Body temperature, evaporative water loss and resting metabolic rate data for six southern African bats

Zenon J. Czenze, Ben Smit, Barry Van Jaarsveld, Marc T. Freeman & Andrew E. McKechnie
1. The microsites that animals occupy during the rest phase of their circadian activity cycle influence their physiology and behaviour, but relatively few studies have examined correlations between interspecific variation in thermal physiology and roost microclimate. Among bats, there is some evidence that species exposed to high roost temperatures (Troost) possess greater heat tolerance and evaporative cooling capacity, but the small number of species for which both thermal physiology and roost microclimate data exist mean...

Distribution and abundance of intertidal sea urchins in South Africa

Kevin C. K. Ma, Suzanne Redelinghuys, Molline N. C. Gusha, Siphelele B. Dyantyi, Christopher D. McQuaid & Francesca Porri
This dataset contains data described in the paper entitled "Intertidal estimates of sea urchin abundance reveal congruence in spatial structure for a guild of consumers". Data include: (1) counts of intertidal sea urchins (Diadema cf. savignyi, Echinometra mathaei, Parechinus angulosus, Stomopneustes variolaris, and Tripneustes gratilla) made from 164 visits to 116 rocky shore sites across South Africa by six different observers; (2) GPS co-ordinates determined for every 1-km distance interval of the South African coastline...

Field-based ecological studies to assess prospective biological control agents for invasive alien plants: an example from giant rat’s tail grass

Guy Sutton, Kim Canavan, Michael Day & Iain Paterson
1. Biological control (biocontrol) of invasive alien plants is a widely utilised weed management tool. Prospective biocontrol agents are typically assessed through host-specificity testing and pre-release efficacy studies performed in quarantine. However, rearing of the potential biocontrol agents and/or test plants is often difficult or impossible under quarantine conditions. Moreover, practitioners may attain laboratory-artefacts in quarantine, which may result in the potential agent being needlessly rejected. Field-based studies in the weed’s indigenous distribution could overcome...

Data from: Density-dependent and species-specific effects on self-organization modulate the resistance of mussel bed ecosystems to hydrodynamic stress

Katy Nicastro & Gerardo Zardi
Mussels self-organize to form large regularly-patterned biogenic structures that modify the biotic and abiotic environment and provide numerous ecosystem functions and services. We used two mussel species which form mono-specific and mixed beds to investigate how species-specific behaviour affects self-organization and resistance to wave stress. For these results, the laboratory dataset was used. Perna perna has strong attachment, but low motility, while Mytilus galloprovincialis shows the reverse. At low density the less motile P. perna...

Prey and predator density-dependent interactions under different water volumes

Ross Cuthbert, Tatenda Dalu, Ryan Wasserman, Arnaud Sentis, Olaf Weyl, William Froneman, Amanda Callaghan & Jaimie Dick
Predation is a critical ecological process that directly and indirectly mediates population stabilities, as well as ecosystem structure and function. The strength of interactions between predators and prey may be mediated by multiple density-dependences concerning numbers of predators and prey. In temporary wetland ecosystems in particular, fluctuating water volumes may alter predation rates through differing search space and prey encounters rates. Using a functional response approach, we examined the influence of predator and prey densities...

Registration Year

  • 2021
    9

Resource Types

  • Dataset
    9

Affiliations

  • Rhodes University
    9
  • South African Institute for Aquatic Biodiversity
    2
  • University of Pretoria
    1
  • Queen's University Belfast
    1
  • University of Algarve
    1
  • Aberystwyth University
    1
  • Shimane University
    1
  • Tokai University
    1
  • GEOMAR Helmholtz Centre for Ocean Research Kiel
    1
  • University of Lille
    1