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

Publications

  1. An Adaptive Resonance Regulator for an Actuator using Periodic Signals in Camless Engine Systems
  2. Modelling, explaining, enacting and getting feedback: How can the acquisition of core practices in teacher education be optimally fostered?
  3. Intraindividual variability in identity centrality
  4. Relationships between language-related variations in text tasks, reading comprehension, and students’ motivation and emotions: A systematic review
  5. Variational pragmatics in the foreign language classroom
  6. Applying Quarter-Vehicle Model Simulation for Road Elevation Measurements Utilizing the Vehicle Level Sensor
  7. Developing a Complex Portrait of Content Teaching for Multilingual Learners via Nonlinear Theoretical Understandings
  8. Diffusion patterns in small vs. large capital markets-the case of value-based management
  9. Reciprocal Relationships Between Dispositional Optimism and Work Experiences
  10. Influence of Mg content in Al alloys on processing characteristics and dynamically recrystallized microstructure of friction surfacing deposits
  11. The structure of emotions in learning situations
  12. Toward a methodical framework for comprehensively assessing forest multifunctionality
  13. Tree diversity increases robustness of multi-trophic interactions
  14. Trap nests for bees and wasps to analyse trophic interactions in changing environments—A systematic overview and user guide
  15. Semiparametric one-step estimation of a sample selection model with endogenous covariates
  16. Modeling of temperature- and strain-driven intermetallic compound evolution in an Al-Mg system via a multiphase-field approach with application to refill friction stir spot welding
  17. Artificial Intelligence in Foreign Language Learning and Teaching
  18. General management principles and a checklist of strategies to guide forest biodiversity conservation
  19. Scattered trees are keystone structures - Implications for conservation
  20. Creating Value from in-Vehicle Data
  21. Erratum: Formalised and non-formalised methods in resource management-knowledge and social learning in participatory processes
  22. Understanding Records. A Field Guide to Recording Practice
  23. Dealing with inclusion–teachers’ assessment of internal and external resources
  24. A matter of connection
  25. Additive Manufacturing of Soft Robots
  26. BERTologyNavigator: Advanced Question Answering with BERT-based Semantics
  27. Entry, exit and productivity
  28. Public Value: rethinking value creation
  29. The persistence of subsistence and the limits to development studies
  30. An Unusual Encounter with Oneself
  31. The erosion of relational values resulting from landscape simplification
  32. Case study: The development of a multi-material heat sink by Additive Manufacturing using Aerosint technology
  33. Controlling a Bank Model Economy by Using an Adaptive Model Predictive Control with Help of an Extended Kalman Filter
  34. Employing A-B tests for optimizing prices levels in e-commerce applications
  35. The Open Anchoring Quest Dataset: Anchored Estimates from 96 Studies on Anchoring Effects