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  • Executive summary
  • Front Material
    • Contents
    • Index of figures
    • Index of tables
    • Acronyms and abbreviations
    • Terms and definitions
  • Getting started
  • Introduction
    • The urgency of targeted biodiversity conservation
    • Simplicity, complexity theory, and biodiversity
    • Inclusion of Indigenous Peoples and local communities by design
    • Biodiversity methodology benefits
  • Overall description
    • Objectives
    • Scope
    • Limitations
  • Project description
    • Principles
      • Principles of working with IP
    • Eligibility criteria
      • Land ownership and law
    • Additionality
    • Project boundaries
      • Spatial limits of the BCP
      • Temporal limits of the BCP
      • Grouped projects
    • Implementation plan
      • Measurement approaches
      • Indicator species observations
      • Risks and uncertainty
    • Effective participation
      • Community involvement
      • Capacity for action
      • Financial transparency
      • Safeguards checklist
  • Calculation
    • Unit calculations
    • Area calculations
    • Time calculations
    • Integrity calculations
    • Value calculations
  • Baseline assessment
    • Baseline ecosystem categorization
    • Analysis of agents and drivers of biodiversity loss
    • Baseline biodiversity (optional)
    • Baseline risk of biodiversity loss
    • Indicator species selection
    • Indicator species integrity score
  • SDG contributions
  • Monitoring plan
    • Monitoring report
    • Additional monitoring requirements
  • Authors
  • References
  • Appendices
    • Appendix A: Biodiversity methodologies comparison table
    • Appendix B: Sample legal proof of land control
    • Appendix C: Sample baseline ecosystem categorization
    • Appendix D: Species categorization of richness
    • Appendix E: Sample selection of indicator species
    • Appendix F: Sample indicator-species observations
    • Appendix G: Sample open-source code and calculation
    • Appendix H: Indigenous authors
    • Appendix I: Letters of support
      • Fernando Ayerbe, Ornithology
      • Ned Hording, Biodiversity
      • Olber Llanos, Zoologist
      • Mike McColm, Ethnology
      • Peter Thomas, Anthropologist
      • Jesús Argente, Marine biology
      • Sara Andreotti, Marine Biologist
      • Carolina Romero, Lawyer.
      • Daniel Urbano, Herpetologist
      • Ramesh Boonratana PhD, Primatologist
      • Theodore Schmitt, Conservationists
      • Anja Hutschenreiter, Ecologist and Tropical Conservationist
      • Miguel Chindoy, Indigenous leader
    • Appendix J: Sample uses of biodiversity unit
    • Appendix K: How to do FPIC
    • Appendix L: Independent Expert Panel Checklist
    • Appendix M: How to calculate a biodiversity credit by hand
    • Appendix N: How to calculate home ranges
    • Appendix O: How to calculate integrity scores
  • Document history
  • Disclaimer
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On this page
  • Basic protocols for home range research:
  • Example database

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  1. Appendices

Appendix N: How to calculate home ranges

Step-by-step instructions for generating accurate home ranges from public data.

PreviousAppendix M: How to calculate a biodiversity credit by handNextAppendix O: How to calculate integrity scores

Last updated 2 months ago

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Home ranges need to be validated from public data. Accepted sources in order of preference are peer-reviewed research papers, academic theses, public datasets, expert opinion, and NGO/policy reports.

Many rare animals have poor documentation on their characteristics. Most projects will need to satisfy independent expert reviewers for the home ranges they have decided to use. We have strong hopes that this science will become more standardized and open-source in the future. For now, we've established a database that experts are welcome to contribute to to make the science and calculations on home ranges more transparent and robust.

Basic protocols for home range research:

  • Home range estimates are reported in sq km.

  • Use primary references only.

  • If there is no published information on the home range for a species, use information from the closest relative possible.

  • Exclude simulation studies and estimates of exclusive (non-overlapping) areas.

  • For migratory bird species, report the breeding home range.

  • Estimates should preferably be based on natural landscapes rather than human-modified areas.

  • If possible, report the annual home range (except for breeding home range of migratory birds). If only seasonal home range estimates are reported, calculate and report the average.

  • If multiple home range estimates are reported based on different methods, calculate and report the average.

  • If a list or table of individual home ranges is provided instead of a reported average, first calculate the mean home range for females and the mean home range for males. Then, calculate and report the overall average of these two means.

  • If the list or table of individual home ranges contains fewer than 10 female/male individuals, calculate and report the average. If the list contains 10 or more individuals, calculate and report the median.

  • If only minimum and maximum values are reported, calculate and report their average.

  • If the provided average home ranges do not align with our protocol (e.g., lacking gender-weighted averages), still use the averages as provided in the article; only calculate averages if the authors do not provide any.

  • We will use the average of reported home range estimates from primary sources for our ISBM, except when there are more than 10 references for a given species, in which case we will use the median.

  • For indicator trees, use mean seed dispersal distance. (Tip, provide an extensive database to look up species in !) If primary data is not available, estimate from genus or family data, or use or Appendix 3 in to extrapolate.

Example database

An example, open-science public database of home ranges for Savimbo projects is reported below. If you want to contribute to researching the characteristics here we could definitely use the help for a LOT of Indigenous projects. Hit us up! We'll put you to work.

Tamme et al. 2014
Supplement 1
Lososova et al. 2023
Thomson et al. 2011