Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.2172/10174389 |
| 报告编号 | EGG--11265-2059 |
| 来源ID | OSTI_ID: 10174389 |
| Effects of supplemental feeding on survivorship, reproduction, and dispersal in San Joaquin kit foxes | |
| [unavailable] | |
| 英文摘要 | Previous field studies at the Naval Petroleum Reserves in California indicated that a decline in tie population size of the endangered San Joaquin kit fox might be linked to declining prey abundance. To evaluate whether kit fox populations we limited by food resources; survival probabilities, sources of mortality, reproductive success, and dispersal rates were compared between foxes with access to supplemental food and foxes without access to supplemental food (controls). Of foxes born in 1988, the probabilities of supplementary fed foxes surviving to age one and age two were higher than corresponding probabilities of control foxes. Survival probabilities of fed foxes from the 1988 cohort also were higher than the average survival probabilities of foxes born in the previous eight years. Most foxes that died during their first year of life died in June, July, or August. Monthly probabilities of survival were higher for fed pups than control pups curing the months of July and August of 1988. Survival probabilities of fed foxes originally r captured as adults and fed foxes born in 1989 were not significantly different than survival probabilities of corresponding control groups. Most foxes for which a cause of death could be determined were lolled by predators. Average dispersal distances were not significantly different between fed and control groups but the two longest dispersal distances were made by control foxes. These results indicate that food availability affects survival, reproduction, and dispersal by kit foxes and provides evidence that kit fox populations may at times be limited by food abundance. |
| 出版年 | 1993 |
| 报告类型 | Technical Report |
| 语种 | 英语 |
| 国家 | 美国 |
| 来源学科分类 | 54 ENVIRONMENTAL SCIENCES ; 02 PETROLEUM ; FOXES ; POPULATION DYNAMICS ; PREDATOR-PREY INTERACTIONS ; FOOD CHAINS ; SURVIVAL CURVES ; REPRODUCTION ; US NAVAL PETROLEUM RESERVES ; CALIFORNIA 540210 ; 540250 ; 020900 ; BASIC STUDIES ; SITE RESOURCE AND USE STUDIES ; ENVIRONMENTAL ASPECTS |
| URL | http://www.osti.gov/scitech/servlets/purl/10174389 |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/264986 |
| 推荐引用方式 GB/T 7714 | [unavailable]. Effects of supplemental feeding on survivorship, reproduction, and dispersal in San Joaquin kit foxes,1993. |
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