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Frog population decline
(from Matawa First Nations Management Open Data)
on February 10, 2016.
updated 16 days ago.
This is a generalized feature layer which indicates the approximate area of study for this journal article. Download is available through the link in the table, and Matawa members <div>may request the download password by e-mailing email@example.com.<div><br /></div><div><b>Abstract: </b>Many acoustic surveys have been initiated to monitor anuran populations in North America. We used the Ontario Backyard Frog Survey to examine temporal and spatial </div><div>trends, from 1994 to 2001. Our data suggest that there have been no consistent trends in site occupancy during this time period, but there were some differences among years. </div><div>Both American toads and northern leopard frogs were more prevalent in 1995 than in 1994. Similarly, species richness was higher in 1995 and 1996 compared to most other years.</div><div>Individual populations of species, however, often were not stable. Extinction and colonization rates varied among species, and ranged from 1.5 to 19.5% per year, and site </div><div>occupancy was negatively correlated with extinction rates. Daily detection probabilities were often quite low, and were primarily driven by the perceived calling intensity. We </div><div>recommend: (i) that monitoring programs attempt to preserve common survey routes, despite heavy turnover of volunteers, (ii) calling surveys be timed to maximize detection </div><div>probabilities, and (iii) analyses based upon landscape features and GIS approaches should be used to determine localized changes in site occupancy or species richness.</div></div>