Results of Study
Results of Study
Research Needs on Amphibian Decline
- Involve volunteers that normally would not conduct surveys at night
(e.g., school groups). Validation is needed of the results of surveys during
the day with and without using broadcast tapes. An approach using school
groups may also enable more data to be collected on urban natural areas
such as ravines, creeks etc.
- Confirm the distance required between observation points to avoid overlap
which may lead to detection of the same calling species.
- Continue to evaluate whether the data collected is valuable only as
presence/ absence data or if the data is indicative of population fluctuations
within a site. This would be possible by continuing to assess the relationships
between call counts, call intensity, and chorus and population size as
evaluated by mark-recapture or other intensive population size estimates.
This needs to be assessed among several populations of the same species
over several years.
- Continue to evaluate automated call-count systems vs. call-count accuracy
and comparability of data collected under various weather conditions by
- Continue to determine the cost of collecting data and the quality of
the data under combinations of different survey lengths and timings to
determine if this method of collecting data produces high-quality information
and is cost-effective.
- Compare trends in presence/absence and population fluctuations among
different call-count approaches, e.g., roadside call counts; single-pond
surveys; larval surveys; and automated systems.
- Develop analytic procedures that will make the best possible use of
the calling and environmental data gathered, ideally generating regional
statistical models of the probability that not hearing a species indicates
that the species is absent at a site, route or area. Analytic procedures
could also study the degree of statistical independence of individuals
stations along a route.
- Use portable anemometers to recelebrate the Beaufort Scale to the kind
of wind disturbance observers are likely to notice (movements of dead spring
herbage, particular species of trees), rather than the British marine/urban
phenomena of the standard scale.
- Look into designing ancillary programs to investigate colonization
rates of new ponds and other created environments. Locations in North America
where extensive monitoring using call-counts is currently under way (or
has been conducted in the past* but was discontinued). The monitoring program
may not apply to the entire state or province, depending on observer participation
or limitations in coordinator's time and funding for the program.