Northern Sea Otter Aging Criteria: data

Measurement of skull ossification patterns is a standard method for aging various mammalian species and has been used to age Russian, Californian, and Alaskan sea otter populations. Cementum annuli counts have also been verified as an accurate aging method for the Alaskan sea otter population. In this study, cementum annuli count results and skull ossification patterns were compared as methods for aging the northern sea otter (Enhydra lutris kenyoni) population in Washington State. Significant agreement was found between the two methods suggesting that either method could be used to age the Washington population of otters. This study also found that ossification of the squamosal-jugal suture at the ventral glenoid...

Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Age determination, Clallam, Grays Harbor, Jefferson, Pacific, All tags... USGS Science Data Catalog (SDC), Washington, age estimation methods, cementum annuli, dental assessment, morphometry, skull ossification, tooth eruption, tooth wear, Fewer tags

Nutrient loading, flushing rate, and lake morphometry data used to identify trophic states in selected watersheds of the eastern and southeastern United States

For State agencies and other water-resources managers, determining which waterbodies to allocate limited funds for protection and restoration while also maximizing cost benefit is challenging. This data release contains trophic state designations determined from secchi depth, and concentrations of chlorophyll a and microcystin at 232 lakes and reservoirs having a surface area of greater than 0.1 square kilometer in watersheds that drain to the Atlantic and eastern Gulf of Mexico coasts of the United States and in watersheds within the Tennessee River Basin. Estimates of nutrient loading (nitrogen and phosphorus, Hoos and others, 2013; Moorman and others, 2014) and flushing rates were combined with waterbody morphometry...

Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Alabama, Connecticut, Florida, Georgia, Hydrology, All tags... Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, North Carolina, Northeast, Pennsylvania, Phosphorus Loads, Rhode Island, SPARROW, SPAtially Referenced Regressions On Watershed attributes (SPARROW), South Carolina, Southeast, USGS Science Data Catalog (SDC), Vermont, Virginia, Water Quality, Water Resources, West Virginia, algae, blue-green algae, cyanobacteria, eutrophication, harmful algal blooms, microcystin, morphometry, nitrogen eutrophication, nutrient loading, phosphorous, total nitrogen, Fewer tags