Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1600-0587.2008.05615.x |
Spatiotemporal food web dynamics along a desert riparian-upland transition | |
Soykan, Candan U.1; Sabo, John L.2 | |
通讯作者 | Soykan, Candan U. |
来源期刊 | ECOGRAPHY |
ISSN | 0906-7590 |
EISSN | 1600-0587 |
出版年 | 2009 |
卷号 | 32期号:2页码:354-368 |
英文摘要 | Increased awareness of spatiotemporal variation in species interactions has motivated the study of temporally-resolved food web dynamics at the landscape level. Empiricists have focused attention on cross-habitat flows of materials, nutrients, and prey, largely ignoring the movement of predators between habitats that differ in productivity (and how predators integrate pulses in resource availability over time). We set out to study seasonal variation in food web interactions between mammalian carnivores and their rodent prey along a riparian-upland gradient in semi-arid southeastern Arizona which features both spatial and temporal heterogeneity in resource availability. Specifically, we tested whether mammalian carnivores spill over from productive, near-river habitats into adjacent, desert-scrub habitats; and if they do, to document the effects of this spillover on rodent communities. Furthermore, we examined seasonal variation in top-down effects by measuring changes in carnivore diet and distribution patterns and rodent populations over time. The results indicate that carnivores track seasonally-abundant resources across the landscape, varying both their diet and movement patterns. In turn, desert-scrub rodent population dynamics track seasonal shifts in carnivore habitat use but not resource availability, suggesting that predation plays a role in structuring rodent communities along the San Pedro River. Further evidence comes from data on rodent community composition, which differs between desert-scrub habitats near and far from the river, despite similarities in resource availability. Our data also suggest that seasonal omnivory helps predators survive lean times, increasing their effects on prey populations. Taken together, these results underscore the importance of spatiotemporal variation in species interactions, highlighting the complexity of natural systems and the need for further detailed studies of food web dynamics. |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000266015600017 |
WOS关键词 | SAN-PEDRO RIVER ; BOTTOM-UP FORCES ; TOP-DOWN ; PRECIPITATION PULSES ; APPARENT COMPETITION ; HABITAT SELECTION ; PREDATION RISK ; TERRESTRIAL ; WATER ; COMMUNITIES |
WOS类目 | Biodiversity Conservation ; Ecology |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
来源机构 | Arizona State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/160346 |
作者单位 | 1.San Diego State Univ, Dept Biol, 5500 Campanile Dr, San Diego, CA 92182 USA; 2.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA |
推荐引用方式 GB/T 7714 | Soykan, Candan U.,Sabo, John L.. Spatiotemporal food web dynamics along a desert riparian-upland transition[J]. Arizona State University,2009,32(2):354-368. |
APA | Soykan, Candan U.,&Sabo, John L..(2009).Spatiotemporal food web dynamics along a desert riparian-upland transition.ECOGRAPHY,32(2),354-368. |
MLA | Soykan, Candan U.,et al."Spatiotemporal food web dynamics along a desert riparian-upland transition".ECOGRAPHY 32.2(2009):354-368. |
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