Evaluating monitoring methods to guide adaptive management of a threatened amphibian (Litoria aurea)

Bower, Deborah S., Pickett, Evan J., Stockwell, Michelle P., Pollard, Carla J., Garnham, James I., Sanders, Madeline R., Clulow, John, and Mahony, Michael J. (2014) Evaluating monitoring methods to guide adaptive management of a threatened amphibian (Litoria aurea). Ecology and Evolution, 4 (8). pp. 1361-1368.

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Abstract

Prompt detection of declines in abundance or distribution of populations is critical when managing threatened species that have high population turnover. Population monitoring programs provide the tools necessary to identify and detect decreases in abundance that will threaten the persistence of key populations and should occur in an adaptive management framework which designs monitoring to maximize detection and minimize effort. We monitored a population of Litoria aurea at Sydney Olympic Park over 5 years using mark–recapture, capture encounter, noncapture encounter, auditory, tadpole trapping, and dip-net surveys. The methods differed in the cost, time, and ability to detect changes in the population. Only capture encounter surveys were able to simultaneously detect a decline in the occupancy, relative abundance, and recruitment of frogs during the surveys. The relative abundance of L. aurea during encounter surveys correlated with the population size obtained from mark–recapture surveys, and the methods were therefore useful for detecting a change in the population. Tadpole trapping and auditory surveys did not predict overall abundance and were therefore not useful in detecting declines. Monitoring regimes should determine optimal survey times to identify periods where populations have the highest detectability. Once this has been achieved, capture encounter surveys provide a cost-effective method of effectively monitoring trends in occupancy, changes in relative abundance, and detecting recruitment in populations.

Item ID: 44069
Item Type: Article (Research - C1)
ISSN: 2045-7758
Keywords: amphibian, auditory, conservation, cost benefit analysis, mark–recapture, tadpole,visual encounter survey
Additional Information:

© 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Funders: Australian Research Council (ARC)
Projects and Grants: ARC Linkage Grant LP0989459
Date Deposited: 25 Jul 2016 22:42
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060207 Population Ecology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 100%
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