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Multi-scale network analysis shows scale-dependency of significance of individual protected areas for connectivity

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Abstract

Context

The problem of how ecological mechanisms create and interact with patterns across different scales is fundamental not only for understanding ecological processes, but also for interpretations of ecological dynamics and the strategies that organisms adopt to cope with variability and cross-scale influences.

Objectives

Our objective was to determine the consistency of the role of individual habitat patches in pattern-process relationships (focusing on the potential for dispersal within a network of patches in a fragmented landscape) across a range of scales.

Methods

Network analysis was used to assess and compare the potential connectivity and spatial distribution of highland fynbos habitat in and between protected areas of the Western Cape of South Africa. Connectivity of fynbos patches was measured using ten maximum threshold distances, ranging from five to 50 km, based on the known average dispersal distances of fynbos endemic bird species.

Results

Network connectivity increased predictably with scale. More interestingly, however, the relative contributions of individual protected areas to network connectivity showed strong scale dependence.

Conclusions

Conservation approaches that rely on single-scale analyses of connectivity and context (e.g., based on data for a single species with a given dispersal distance) are inadequate to identify key land parcels. Landscape planning, and specifically the assessment of the value of individual areas for dispersal, must therefore be undertaken with a multi-scale approach. Developing a better understanding of scaling dependencies in fragmenting landscapes is of high importance for both ecological theory and conservation planning.

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Acknowledgments

This research was supported by the DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, a CPRR Grant to GSC from the National Research Foundation of South Africa, and a James S. McDonnell Foundation complexity scholar award to GSC.

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Authors and Affiliations

  1. Percy FitzPatrick Institute of African Ornithology, University of Cape Town, Rondebosch, 7701, Cape Town, South Africa

    Kristine Maciejewski & Graeme S. Cumming

  2. ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, 4811, Australia

    Graeme S. Cumming

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  1. Kristine Maciejewski
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  2. Graeme S. Cumming
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Correspondence to Kristine Maciejewski.

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Maciejewski, K., Cumming, G.S. Multi-scale network analysis shows scale-dependency of significance of individual protected areas for connectivity. Landscape Ecol 31, 761–774 (2016). https://doi.org/10.1007/s10980-015-0285-2

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