Perfectly nested or significantly nested - an important difference for conservation management

Research output: Journal contributionsJournal articlesResearchpeer-review

Authors

Assemblages are nested if species present at species-poor sites are subsets of those present at species-rich sites. In fragmented landscapes, nestedness analyses have been suggested as a means of assessing which patches are most important for biodiversity conservation. In the theoretical situation of perfect nestedness in relation to patch size, the single largest patch is disproportionally more important compared to smaller patches and will capture all species of conservation concern. However, real ecosystems are rarely perfectly nested. Here, we examined how different the implications for conservation management would be for an assemblage of birds that was highly significantly, but imperfectly nested in relation to patch size.

The study focused on a fragmented landscape in southeastern Australia. Across 43 patches, 76 species of birds were recorded and classified as generalist, intermediate and sensitive species. The dataset was highly significantly nested by patch size (p=0.002). Under perfect nestedness by patch size, the single largest patch would have captured all species, and all sensitive species would have co-occurred in the largest patch. In our imperfectly nested dataset, co-occurrence patterns were substantially weaker. Usually, less than half of the sensitive species co-occurred in any given patch, and using the largest patches only, over a quarter of the study area would have been required to capture 80% of sensitive species at least once. These findings highlight there can be large qualitative differences between theoretical perfectly nested assemblages, and real imperfectly nested assemblages.

Despite the outcomes of our study which showed highly significant nestedness by area, smaller patches in the system were important to complement large patches. We therefore argue that nestedness analyses need to be interpreted carefully, especially in an applied conservation context. Alternative conservation planning tools which consider the complementarity of various different patches are likely to be more informative for conservation management than nestedness analyses.
Original languageEnglish
JournalOikos
Volume109
Issue number3
Pages (from-to)485-494
Number of pages10
DOIs
Publication statusPublished - 01.06.2005
Externally publishedYes

Recently viewed

Researchers

  1. Matthias Klöppner

Publications

  1. Proxy Indicators for the Quality of Open-domain Dialogues
  2. Phosphorus uptake from struvite is modulated by the nitrogen form applied
  3. Erratum: Formalised and non-formalised methods in resource management-knowledge and social learning in participatory processes
  4. Machine Learning Applications
  5. Theory-based course design for professional master's degree program in business engineering
  6. Typewriting Dynamics
  7. Variational pragmatics in the foreign language classroom
  8. Subverting Autocracy
  9. Basic analysis of the incremental profile forming process
  10. New trends in pragmatics
  11. The Crowd in Flux
  12. Overyielding in experimental grassland communities - Irrespective of species pool or spatial scale
  13. The role of supervisor support for dealing with customer verbal aggression. Differences between ethnic minority and ethnic majority workers
  14. Ästhetikkolumne
  15. Mouseology – Ludic Interfaces – Zero Interfaces
  16. SAP exchange infrastructure for developers
  17. Idiosyncratic volatility, option-based measures of informed trading, and investor attention
  18. Lesetechnik
  19. Over here and over there
  20. Numerical investigation of laser beam-welded AA2198 joints under different artificial ageing conditions
  21. Attention and the Speed of Information Processing
  22. Futures loss, despair and empowerment work in the University of Vechta: an action research project
  23. Credit constraints, endogenous innovations, and price setting in international trade
  24. Multiculturalism in Canada
  25. Studien zu einer Ethik der Enttäuschung
  26. Two-pass friction stir welding of cladded API X65
  27. Asynchrone Objekte
  28. Tritheism
  29. Schwarz-weiß in Farbe
  30. All production is joint production - A thermodynamic analysis
  31. Introduction: Children's Literature Global and Local
  32. Das Ethos reiner Fraulichkeit
  33. Rechtliche Aspekte
  34. The F.D.P.
  35. Testing Lazear's jack-of-all-trades view of entrepreneurship with German micro data
  36. Didactics of Mathematics in Higher Education as a Scientific Discipline - Conference Proceedings
  37. Vom Abfall zum Einfall
  38. READY! Un programma per stimolare la prontezza decisionale
  39. Größen bauen auf Längen
  40. Let’s talk about money! Assessing the link between firm performance and voluntary Say-on-Pay votes
  41. Impulse für die Migrationsgesellschaft