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Inventory Methods for
Bats

Standards for Components of British Columbia's Biodiversity No. 20

Prepared by
Ministry of Environment, Lands and Parks
Resources Inventory Branch
for the Terrestrial Ecosystems Task Force
Resources Inventory Committee

February 1998
Version 2.0

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Table of Contents

CIP Data

Preface

Acknowledgements

1. Introduction

2. Inventory Group

3. Protocol (General)

4. Presence/Not detected & Relative Abundance

5. Absolute Abundance

Glossary

Literature Cited

Appendix A.

List of Figures

Figure 1. Forearm (FA) and other measurements (From van Zyll de Jong, 1985)
Figure 2. Finger joint of (a) juvenile (tapered, and epiphyseal plates should be visible with the aid of a flashlight illuminating the wing) and (b) adult (nobby and opaque) (From Nagorsen and Brigham, 1993).
Figure 3. RIC species inventory survey design hierarchy with examples.
Figure 4. Example of mist net placement. Note that the net is placed in the vegetation such that a potential flight corridor is covered by the net. (From Kunz and Kurta, 1988).
Figure 5. Mist net components and dimensions.
Figure 6. Examples of harp trap placement, a) along a forest trail, (b) at the entrance to a cave (From Kunz and Kurta, 1988).
Figure 7. Harp trap design and detail. (design from Tuttle 1974, drawn by Tom Swearingen).
Figure 8. Sonogram of echolocation calls (frequency versus time).

List of Tables

Table 1. Species of bat found in British Columbia and relevant natural history (information from Nagorsen and Brigham, 1993; British Columbia 1996 Red and Blue List for Terrestrial Vertebrates).
Table 2. Recommended combinations of techniques to assess presence/not detected, relative abundance, and absolute abundance of bats.
Table 3. Types of inventory surveys, the data forms needed, and the level of intensity of the survey.
Table 4. Recommended sampling methods for B.C. bats and location of summer roosts (roost information from Holroyd et al., 1994; Nagorsen and Brigham, 1993).
Table 5. Identification key for use with a tunable bat detector for identifying selected species of bat found in British Columbia.
Table 6. Characteristics of the ultrasonic calls of selected bat species as viewed with a period meter/oscilloscope (Modified from Fenton et al., 1983; Thomas and West, 1989).


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