File Geodatabase Feature Class
Tags
eastern Sierra, Greater Sage-grouse, Mono, biota, reproduction, monitoring, desert, bird, distribution, Centrocercus urophasianus, California, biota, abundance, trend
This data set was designed to track the maximum numbers of male Greater Sage-grouse at individual leks each year and over time. It can be used to track population trends, and the dynamics of leks and the variations in their use. DATA ASSUMPTIONS AND LIMITATIONS The same count errors (see caveats below) occur consistently and allow counts to provide the basis for valid assumptions of the variation in the population size from year-to-year, and over longer time periods, in local populations. The three to four different counts of each lek also mitigate against having a single-day count with bad weather imparing grouse movement to a lek and poor visibility to count grouse. KNOWN CAVEATS OF THE DATA * Not all leks were counted in all years. * The data does not include count data that were not the highest for a particular lek in a given year. * Not all sage-grouse in a area may be at a given lek during a count period. * Not all sage-grouse at a lek in a given count period may be counted. * Observations of a single displaying male grouse, by itself, are not included since this type of observation does not meet the definition of a lek.
This data set covers the highest annual counts made of male Greater Sage-grouse at leks in Mono County. A lek is a traditional display area of courtship and breeding where two or more male sage-grouse have attended in two or more of the previous 5 years. The area is normally located in a very open site in or adjacent to sage brush dominated communities. Usually 3-4 counts are made each year from late March to mid-April (depending on local weather conditions). Counts start about sunrise, are made over a 1-2 hour period, with observers about 100 meters distant from most of the activity. The counts of sage-grouse at leks were made largely by Department of Fish and Game and Bureau of Land Management employees. These data document 887 counts representing the count with the most male sage-grouse observed at a particular lek over the 52 years of counts, from 1953 through 2004. All 35 of these leks where counts were made are in Mono County, and most are east of Highway 395. WHAT EACH RECORD REPRESENTS Each record contains information on the local population name, lek identification code, highest number of grouse observed for each lek in each year where a count was made, and the UTM coordinates representing each lek's location.
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Please check with the contact person responsible for this data set. See Point of Contact below.
Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
Extent
| West | -119.445418 | East | -118.700132 |
| North | 38.541624 | South | 37.618053 |
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
Please check with the contact person responsible for this data set. See Point of Contact below.
Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.