Anuran call surveys on small wetlands in Prince Edward Island, Canada restored by dredging of sediments

Stevens, Cameron E.; Diamond, Antony W.; Gabor, T. Shane

doi:10.1672/0277-5212(2002)022[0090:acsosw]2.0.co;2

Cited by 40 publications

(41 citation statements)

References 37 publications

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“…Accordingly, amphibian colonization studies of North American new or restored wetlands have shown similar results for a wide range of potential colonizing species (Tab. 6), supporting our finding that important colonizers arrive at the new or restored wetland within the first 2 years (e.g., Perry et al, 1996;Lehtinen and Galatowitsch, 2001;Pechmann et al, 2001;Stevens et al, 2002). Unlike what we found, however, only one case of North American colonization detected more than 50% of these local species reproducing by the second year (Vasconcelos and Calhoun, 2006).…”

Section: Discussionsupporting

confidence: 85%

Man-made Mediterranean temporary ponds as a tool for amphibian conservation

Ruhí

Sebastián

Feo

et al. 2012

Ann. Limnol. - Int. J. Lim.

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-Mediterranean temporary ponds (MTPs) are crucial breeding sites for local amphibians, a faunal group in decline in the Mediterranean mainly due to wetland destruction. Although the disappearance of lentic habitats in other regions of the world has been ameliorated by the creation and restoration of wetlands, these tactics remain untested in Mediterranean wetlands. To evaluate the amphibian colonization dynamics of artificial MTPs in the north-eastern Iberian Peninsula, we monitored two artificial MTPs (one in a highdiversity area and the other in a low-diversity area) over 2 years. We selected reference wetlands at each area, and amphibian communities of man-made MTPs were compared to those of reference wetlands. We found that, beginning in the first year, artificial MTPs were a valuable habitat for regional amphibian fauna. Posteriorly, we focused on the reproductive success of the natterjack toad, Bufo calamita. Using a drift fence equipped with pit-fall traps, we measured the abundance of both reproductive adults entering the pond and post-metamorphic individuals exiting the pond. Using mark-recapture methods, we analyzed the time and energy costs associated with reproduction in the artificial MTPs. We observed a highly variable colonization dynamics between sites, between hydroperiods, and within hydroperiods, and these dynamics often depended on meteorological factors. Our results suggest that even at a short timescale, native amphibian species such as B. calamita can benefit from wetland creation in the Mediterranean region.

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Section: Discussionsupporting

confidence: 85%

Man-made Mediterranean temporary ponds as a tool for amphibian conservation

Ruhí

Sebastián

Feo

et al. 2012

Ann. Limnol. - Int. J. Lim.

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“…Monitoring the distribution and abundance of anuran amphibians often involves registering the calling activity during the breeding season. Such call surveys are used to monitor both distribution and abundance (e.g., Lepage et al, 1997;Mossman et al, 1998;Hemesath, 1998;Stevens et al, 2002;Buckley and Beebee, 2004). Although calling facilitates detection of anurans, the frequency and intensity of calls may be influenced by date and time of day, survey length, observer experience, and other factors (e.g., Shirose et al, 1997;Bridges and Dorcas, 2000;Crouch and Paton, 2002;Genet and Sargent, 2003).…”

Section: Introductionmentioning

confidence: 99%

Monitoring distributions using call surveys: estimating site occupancy, detection probabilities and inferring absence

Pellet

Schmidt

2005

Biological Conservation

173

140

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Monitoring programs serve to track changes in the distribution and abundance of species. A major problem with most monitoring programs is that species detection is imperfect and some populations are inevitably missed. Therefore, in most monitoring programs the true distribution of a species will be underestimated. Here, we report a field test of the reliability and performance of a commonly used method to monitor the distribution of amphibians (anuran call surveys). We surveyed the distribution of four anuran species in western Switzerland, and estimated detection probabilities to account for imperfect species detection and used these estimates to adjust our estimate of site occupancy (i.e., distribution). Next, we assessed how detection probabilities were affected by weather and how site occupancy was affected by site specific covariates. For one species (Hyla arborea), call surveys proved efficient in determining the regional distribution with only few site visits because detection probabilities were relatively high. The call surveys apparently missed many populations of another common species (Bufo calamita) because detection probabilities were lower. Two other species (Bombina variegata and Alytes obstetricans) were uncommon and strong inference from the analysis is not possible. Thus, multispecies surveys may be inefficient for rare species. Estimates of detection probabilities were used to calculate how many site visits are necessary to infer the absence of a species with some predetermined statistical certainty. The implications of ''false absences'' are important in ecology as they are known to bias usual habitat suitability models and overestimate extinction/colonization events in metapopulations. Large-scale monitoring programs would benefit from the application of an estimation-based approach to monitoring the distribution of species.

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“…These surveys originated under conservation initiatives in the Great Lakes region and have become an important technique in a growing number of monitoring programs Bridges and Dorcas, 2000;Weir, 2001;Crouch and Patton, 2002) and ecological studies that seek to understand habitat-use patterns of anuran amphibians in North America (Knutson et al, 1999;Kolozsvary and Swihart, 1999;Lehtinen et al, 1999;Skelly et al, 1999;Waldick et al, 1999;Zampela and Bunnell, 2000;Palik et al, 2001;Guerry and Hunter, 2002;Stevens et al, 2002). In 2001, the North American Amphibian Monitoring Program (NAAMP) developed a standardized protocol for anuran call surveys in the United States and Canada (Wier, 2001).…”

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confidence: 99%

“…Fewer researchers have examined the size of breeding populations with call data (Knutson et al, 1999;Zampela and Bunnell, 2000;Stevens et al, 2002), possibly because of the inherent difficulties in counting calling males in ponds and wetlands and the interpretation of such data. The current method of estimating the size of calling anuran populations and choruses is based on indices of abundance: Rank 1 indicates no overlap in calls and the number of individuals can be reliably estimated, Rank 2 suggests some overlap in calls and the number of males can be estimated (but less accurately than those in Rank 1 choruses), and Rank 3 indicates a full chorus and the number of individuals can not be estimated Shirose et al, 1997;Wier, 2001).…”

mentioning

confidence: 99%