. Ecuador : Cabeceras Cofanes-Chingual. Natural history; Biodiversity; Wildlife conservation. of six (H'= bits). Absolute abundance in the five studied sites averaged 30 individuals (minimum 13, maximum 43). Species dominance varied among the sites: Pristimantis grp. orcesi was dominant in two, while Hypodactylus brnnneus, Osornophryne bufoniformis, and Pristimantis chloronotus each were dominant in remaining evaluated sites. The dominance-diversity curve of the assemblage (Fig. 21), shows that five (or 71%) of its species possess high dominance values and concentrate 96% of the total abund
. Ecuador : Cabeceras Cofanes-Chingual. Natural history; Biodiversity; Wildlife conservation. of six (H'= bits). Absolute abundance in the five studied sites averaged 30 individuals (minimum 13, maximum 43). Species dominance varied among the sites: Pristimantis grp. orcesi was dominant in two, while Hypodactylus brnnneus, Osornophryne bufoniformis, and Pristimantis chloronotus each were dominant in remaining evaluated sites. The dominance-diversity curve of the assemblage (Fig. 21), shows that five (or 71%) of its species possess high dominance values and concentrate 96% of the total abundance obtained, with Pristimantis grp. orcesi (p, - ) as the dominant species. Alto La Bonita We found 267 individuals representing 11 species (10 amphibians and 1 reptile). The amphibians belong to four families, of which Strabomantidae is best represented with one genus and six species, and the remaining families (Amphignathodontidae, Hylidae, and Bufonidae) each include only one species. One colubrid snake (Chironius monticola) represents the reptiles. We noted the presence of Pristimantis colonensis (Fig. 6B) and P. ortizi, previously known only from their type locations. We also collected a rare endemic species {Osornophryne aff. guacamayo) and several frog species (such as Hyloscirtus and Gastrotheca) whose reproductive strategies have been affected by climate change and epidemiological factors in the Andes of both Ecuador and Colombia. Absolute richness and diversity measures (H') obtained for the four sites evaluated in Alto La Bonita registered an average of six species (H'= bits), with a minimum of three (H'= bits) and a maximum of eight (H'= bits). Abundance in the four studied sites averaged 69 individuals (minimum 50, maximum 104). Dominance between sites was similar, and Osornophryne aff. guacamayo was dominant in every sampled site. The dominance-diversity curve of the assemblage (Fig. 22) shows that 73% of its species possess low dominance levels;
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