Developmental stage at Anaxyrus canorus embryos died at various breeding sites
Dates
Publication Date
2020-12-15
Start Date
1999-05-01
End Date
1999-06-30
Citation
Sadinski, W., 2020, Developmental stage at Anaxyrus canorus embryos died at various breeding sites: U.S. Geological Survey data release, https://doi.org/10.5066/P9BVZDOP.
Summary
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 three general categories (early, mid, and late) for the developmental stage at which embryos of A. canorus died among various breeding sites from 1999 to 2001. 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 from hatched embryos and when any remnants of dead embryos typically still were visible). We did not assess mortality in any egg [...]
Summary
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 three general categories (early, mid, and late) for the developmental stage at which embryos of A. canorus died among various breeding sites from 1999 to 2001. 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 from hatched embryos and when any remnants of dead embryos typically still were visible). We did not assess mortality in any egg masses that had deteriorated too far to evaluate embryos.
We used these data to help us evaluate the effects of potential exposure to freezing, disease, and predatory flatworms on embryos of A. canorus in our study area. Other researchers could use them to address various ecological questions related to fitness, reproduction success, recruitment, and natural history, among other topics for A. canorus in our study area or elsewhere.
