TABLE OF CONTENTS 



Page 



ACKNOWLEDGEMENTS i 



SUMMARY ii 



I . INTRODUCTION 1 



II . REVIEW OF PRESENT STATUS 1 



III. UPDATE OF GEOGRAPHIC DISTRIBUTION 2 



IV. MONITORING STUDIES 2 



V. TRANSPLANT EXPERIMENTS 14 



VI . STUDY RECOMMENDATIONS 20 



VII. ELEMENT OCCURRENCE PRINT-OUTS AND MAPS: NEW SITES... 21 



VIII. ELEMENT OCCURRENCE PRINT-OUTS: RESURVEYED SITES 26 



IX. MAPS OF PONDS SURVEYED WITHOUT SUCCESS 53 



X. LITERATURE CITED 56 



