7 Works

Data from: Using functional responses to quantify interaction effects among predators

Ryan J. Wasserman, Mhairi E. Alexander, Tatenda Dalu, Bruce R. Ellender, Horst Kaiser & Olaf L. F. Weyl
1. Predator diversity alterations have been observed in most ecosystems as a result of the loss and/ or addition of species. This has implications for predator-prey dynamics as non-trophic interactions among predators, so called multiple predator effects (MPE), are known to influence predation success. In addition, there is often a density-dependant relationship between prey availability and prey consumption (functional response). While MPE investigations are common in the literature, functional responses have rarely been incorporated into...

Data from: The mayfly nymph Austrophlebioides pusillus Harker defies common osmoregulatory assumptions

Renee Dowse, Carolyn G. Palmer, Kasey Hills, Fraser Torpy & Ben J. Kefford
Osmoregulation is a key physiological function, critical for homeostasis. The basic physiological mechanisms of osmoregulation are thought to be well established. However, through a series of experiments exposing the freshwater mayfly nymph Austrophlebioides pusillus (Ephemeroptera) to increasing salinities, we present research that challenges the extent of current understanding of the relationship between osmoregulation and mortality. A. pusillus had modelled 96 h LC10, LC50 and LC99 of 2.4, 4.8 and 10 g l−1 added synthetic marine...

Data from: Secondary contact and asymmetrical gene flow in a cosmopolitan marine fish across the Benguela upwelling zone

Kerry Reid, Thierry B. Hoareau, John E. Graves, Warren M. Potts, Sandrina M. R. Do Santos, Arrie W. Klopper & Paulette Bloomer
The combination of oceanographic barriers and habitat heterogeneity are known to reduce connectivity and leave specific genetic signatures in the demographic history of marine species. However, barriers to gene flow in the marine environment are almost never impermeable which inevitably allows secondary contact to occur. In this study eight sampling sites (five along the South African coastline, one each in Angola, Senegal and Portugal) were chosen to examine the population genetic structure and phylogeographic history...

Data from: Multiple mating, paternity and complex fertilisation patterns in the chokka squid Loligo reynaudi

Marie-Jose Naud, Warwick H. H. Sauer, Niall J. McKeown, Paul W. Shaw & Marie-Jose Naud
Polyandry is widespread and influences patterns of sexual selection, with implications for sexual conflict over mating. Assessing sperm precedence patterns is a first step towards understanding sperm competition within a female and elucidating the roles of male- and female-controlled factors. In this study behavioural field data and genetic data were combined to investigate polyandry in the chokka squid Loligo reynaudii. Microsatellite DNA-based paternity analysis revealed multiple paternity to be the norm, with 79% of broods...

Data from: Spatio-temporal genetic structure and the effects of long-term fishing in two partially sympatric offshore demersal fishes

Romina Henriques, Sophie Von Der Heyden, Marek R. Lipinski, Nina Du Toit, Paulus Kainge, Paulette Bloomer & Conrad A. Matthee
Environmental gradients have been shown to disrupt gene flow in marine species, yet their influence in structuring populations at depth remains poorly understood. The Cape hakes (Merluccius paradoxus and M. capensis) are demersal species co-occurring in the Benguela Current system, where decades of intense fishing resulted in severely depleted stocks in the past. Previous studies identified conflicting mtDNA genetic substructuring patterns and thus contrasting evolutionary trajectories for both species. Using 10 microsatellite loci, the control...

Data from: Long-term, high frequency in situ measurements of intertidal mussel bed temperatures using biomimetic sensors

Brian Helmuth, Francis Choi, Allison Matzelle, Jessica L. Torossian, Scott L. Morella, K. A. S. Mislan, Lauren Yamane, Denise Strickland, P. Lauren Szathmary, Sarah Gilman, Alyson Tockstein, Thomas J. Hilbish, Michael T. Burrows, Anne Marie Power, Elizabeth Gosling, Nova Mieszkowska, Christopher D. G. Harley, Michael Nishizaki, Emily Carrington, Bruce Menge, Laura Petes, Melissa M. Foley, Angela Johnson, Megan Poole, Mae M. Noble … & Gerardo Zardi
At a proximal level, the physiological impacts of global climate change on ectothermic organisms are manifest as changes in body temperatures. Especially for plants and animals exposed to direct solar radiation, body temperatures can be substantially different from air temperatures. We deployed biomimetic sensors that approximate the thermal characteristics of intertidal mussels at 71 sites worldwide, from 1998-present. Loggers recorded temperatures at 10–30 min intervals nearly continuously at multiple intertidal elevations. Comparisons against direct measurements...

Data from: Forest degradation and invasive species synergistically impact Mimusops andongensis (Sapotaceae) in Lama Forest Reserve, Benin

Gisele K.S. Sinasson, Charlie M. Shackleton, Romain L. Glèlè Kakaï & Brice Sinsin
Harvesting of Non-Timber Forest Products (NTFPs) can threaten target species, especially those with limited distribution and density. Exploited species also face threats from habitat fragmentation, fire, and invasive species. We assessed the impact of human disturbances and invasive species on the population of a key multipurpose NTFP species, Mimusops andongensis, in Lama Forest reserve (Benin). The densities of adult trees and regenerative stems decreased with increasing degradation. Mimusops andongensis contributed less to total tree density...

Registration Year

  • 2016
    7

Resource Types

  • Dataset
    7

Affiliations

  • Rhodes University
    7
  • University of Pretoria
    2
  • Stellenbosch University
    2
  • University of Washington
    1
  • Stanford University
    1
  • Scripps College
    1
  • Oregon State University
    1
  • University of Waikato
    1
  • Aberystwyth University
    1
  • Downeast Institute
    1