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We produced this data set as part of a larger, integrated study to assess the statuses of populations of Anaxyrus canorus and the causes of observed effects on fitness at field sites, primarily in Yosemite National Park near Tioga Pass, from 1996 to 2001. We assessed the extent of annual mortality among embryos of A. canorus and Pseudacris regilla variously among breeding sites and years by measuring hatching success in as many individual egg masses as possible, given logistical constraints, at sites we surveyed annually from 1996 to 2000. We visually evaluated each individual embryo in an egg mass in situ while kneeling alongside it immediately before, at, or very soon after hatching (when individual capsules remained...


    map background search result map search result map Embryo mortality for Anaxyrus canorus and Pseudacris regilla at various breeding sites near Tioga Pass, California, USA, from 1996 to 2001 Embryo mortality for Anaxyrus canorus and Pseudacris regilla at various breeding sites near Tioga Pass, California, USA, from 1996 to 2001