Spatial congruence between ecotones and range-restricted species: implications for conservation biogeography at the sub-continental scale

van Rensburg, Berndt J., Levin, Noam and Kark, Salit (2009) Spatial congruence between ecotones and range-restricted species: implications for conservation biogeography at the sub-continental scale. Diversity and Distributions, 15 3: 379-389. doi:10.1111/j.1472-4642.2008.00545.x


Author van Rensburg, Berndt J.
Levin, Noam
Kark, Salit
Title Spatial congruence between ecotones and range-restricted species: implications for conservation biogeography at the sub-continental scale
Journal name Diversity and Distributions   Check publisher's open access policy
ISSN 1366-9516
1472-4642
Publication date 2009-05-01
Year available 2009
Sub-type Article (original research)
DOI 10.1111/j.1472-4642.2008.00545.x
Open Access Status Not yet assessed
Volume 15
Issue 3
Start page 379
End page 389
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Abstract To examine whether at a sub-continental scale range-limited species tend to occur close to areas of transition between vegetation boundaries more often than expected by chance.
Formatted abstract
Aim  To examine whether at a sub-continental scale range-limited species tend to occur close to areas of transition between vegetation boundaries more often than expected by chance.
Location  South Africa and Lesotho.
Methods  We examined the relationship between the distance of a grid square to ecological transition areas between vegetation types and both avian and frog range-limited species richness in the quadrat. We used quadrats at a spatial resolution of quarter degree (15′ × 15′≈ 676 km2). Spatial congruence between areas representing range-restricted species and those representing ecological transition zones was assessed using a random draw technique.
Results  Species richness and range size rarity are generally negatively correlated with distance to transition areas between vegetation communities when analysed for the whole region for both groups. Although this relationship becomes weaker after controlling for environmental energy and topographical heterogeneity, the explanatory power of distance to transition areas remains significant, and compared to the different biomes examined, accounts for most of the variation in bird richness (20%), frog richness (18%), range-restricted bird species (17%) and range-restricted frog species (16%) in the savanna biome. The random draw technique indicated that areas representing range-restricted species were situated significantly closer in space to those areas representing transition areas between vegetation communities than expected by chance.
Main conclusions  We find that at the sub-continental scale, when examined for South Africa, areas of transition between vegetation communities hold concentrations of range-limited species in both birds and frogs. We find that South African endemic/range-limited birds and frogs are located closer to ecological transition zones than endemics and non-endemics combined. This has important implications for ongoing conservation planning in a biogeographical context.
Keyword Areas of transition
Biome
Birds
Complementary
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 740/04
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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