Environmental Domains and Range-Limiting Mechanisms: Testing the Abundant Centre Hypothesis Using Southern African Sandhoppers

Baldanzi, Simone; McQuaid, Christopher D.; Cannicci, Stefano; Porri, Francesca

doi:10.1371/journal.pone.0054598

Cited by 29 publications

(40 citation statements)

References 63 publications

(129 reference statements)

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“…The sandhopper Talorchestria capensis is widely, but patchily distributed along the South African coast (Griffiths 1976;Baldanzi et al 2013). Its distribution is mainly driven by the morphodynamic conditions of the shore and does not follow the assumptions of the Abundance Centre Theory (Baldanzi et al 2013).…”

Section: Model Organism Collection Maintenance and Acclimationmentioning

confidence: 99%

“…Its distribution is mainly driven by the morphodynamic conditions of the shore and does not follow the assumptions of the Abundance Centre Theory (Baldanzi et al 2013). Nonetheless, its distribution does encompass four different biogeographic regions (defined by Lombard 2004) which are strongly affected by ocean currents with contrasting temperature regimes, suggesting that there may be differences in thermal physiology among populations (Baldanzi et al 2013). Little is known about the biology of T. capensis, but these sandhoppers should have a life-span of about 1 year, with two main reproductive peaks, although females can carry eggs all year around (Van Senus 1988).…”

Section: Model Organism Collection Maintenance and Acclimationmentioning

confidence: 99%

“…Specimens were collected from five geographically separated populations, covering approximately 1800 km of coastline within the distributional range of T. capensis ( Fig. 1 (Baldanzi et al 2013) chosen on the basis of their relative position within the geographical range of T. capensis. Animals were collected during a single survey of 15 days, from March to April 2013.…”

Section: Model Organism Collection Maintenance and Acclimationmentioning

confidence: 99%

“…Hence, the Abundant Centre Hypothesis (ACH), which predicts higher numbers of individuals at the centre of their spatial distribution compared to the periphery, has been tested in many taxa (Sagarin and Gaines 2002;Samis and Eckert 2007;Tuya et al 2008;Rivadeneira et al 2010;Virgós et al 2011;Fenberg and Rivadeneira 2011;Baldanzi et al 2013). In addition to abundance, a variety of comparisons have been used to test the predictions of the ACH, including life history traits and size (Gilman 2006;Lester et al 2007;Rivadeneira et al 2010;Baldanzi et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…PN and UM are the western and eastern limits of the geographic range, respectively; PB and GB are within the centre of the distribution; PA lies between the centre and the eastern limit of distribution. Between GB and PN there is a gap in the spatial distribution of T. capensis (Baldanzi et al 2013) thermal tolerance at collection sites where the environmental temperatures are more variable, as suggested by the CVH while, conversely, more variable environmental temperatures should lower the thermal sensitivity as predicted by Jensen's Inequality Theory (Ruel and Ayres 1999).…”

Section: Introductionmentioning

confidence: 99%

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Contrasting environments shape thermal physiology across the spatial range of the sandhopper Talorchestia capensis

et al. 2015

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Integrating thermal physiology and species range extent can contribute to a better understanding of the likely effects of climate change on natural populations. Generally, broadly distributed species show variation in thermal physiology between populations. Within their distributional ranges, populations at the edges are assumed to experience more challenging environments than central populations (fundamental niche breadth hypothesis). We have investigated differences in thermal tolerance and thermal sensitivity under increasing/decreasing temperatures among geographically separated populations of the sandhopper Talorchestia capensis along the South African coasts. We tested whether the thermal tolerance and thermal sensitivity of T. capensis differ between central and marginal populations using a non-parametric constraint space analysis. We linked thermal sensitivity to environmental history by using historical climatic data to evaluate whether individual responses to temperature could be related to natural long-term fluctuations in air temperatures. Our results demonstrate that there were significant differences in the thermal response of T. capensis populations to both increasing/decreasing temperatures. Thermal sensitivity (for increasing temperatures only) was negatively related to temperature variability and positively related to temperature predictability. Two different models fitted the geographical distribution of thermal sensitivity and thermal tolerance. Our results confirm that widespread species show differences in physiology among populations by providing evidence of contrasting thermal responses in individuals subject to different environmental conditions at the limits of the species' spatial range. When considering the complex interactions between individual physiology and species ranges, it is not sufficient to consider mean environmental temperatures, or even temperature variability; the predictability of that variability may be critical.

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Section: Model Organism Collection Maintenance and Acclimationmentioning

confidence: 99%

Section: Model Organism Collection Maintenance and Acclimationmentioning

confidence: 99%

Section: Model Organism Collection Maintenance and Acclimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contrasting environments shape thermal physiology across the spatial range of the sandhopper Talorchestia capensis

et al. 2015

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Epigenetic variation among natural populations of the South African sandhopper Talorchestia capensis

et al. 2016

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Molecular evidence of distinct evolutionary units in the sandhopper Talorchestia capensis (Amphipoda, Talitridae) along South African coasts

et al. 2016

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Marine geographical and ecological barriers often reflect intraspecific genetic discontinuities among populations which may experience different selective pressures and undergo evolutionary divergence. While the phylogeography of marine intertidal invertebrates across the Atlantic/Indian Ocean transition received more attention, the population genetic structures of supralittoral direct developers across such transition area have been poorly investigated. Sandhoppers are supralittoral invertebrates characterised by a direct developmental mode (low dispersal ability), and Talorchestia capensis (Amphipoda, Talitridae) represents the most abundant species of sandhoppers along the South African coasts. To define population structure of T. capensis, we used a mitochondrial marker (the cytochrome oxidase subunit I gene, COX1). T. capensis showed a clean population structure with three main haplogroups genetically well separated, although this separation is not perfectly in line with geographical boundaries described for this area. The presence of separate evolutionary significant units is also confirmed by the shape of mismatch distribution, as well as the p distance values among groups. The overall results confirm the importance of mtDNA to retrieve information on the evolutionary history of species. This study suggests the evidence of a complex-species for this sandhoppers, which have never been considered before, providing fundamental basis for further studies.

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Environmental Domains and Range-Limiting Mechanisms: Testing the Abundant Centre Hypothesis Using Southern African Sandhoppers

Cited by 29 publications

References 63 publications

Contrasting environments shape thermal physiology across the spatial range of the sandhopper Talorchestia capensis

Contrasting environments shape thermal physiology across the spatial range of the sandhopper Talorchestia capensis

Epigenetic variation among natural populations of the South African sandhopper Talorchestia capensis

Molecular evidence of distinct evolutionary units in the sandhopper Talorchestia capensis (Amphipoda, Talitridae) along South African coasts

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