Arid
DOI10.1007/s00442-015-3304-8
Cacti supply limited nutrients to a desert rodent community
Orr, Teri J.1,2; Newsome, Seth D.3; Wolf, Blair O.3
通讯作者Orr, Teri J.
来源期刊OECOLOGIA
ISSN0029-8549
EISSN1432-1939
出版年2015
卷号178期号:4页码:1045-1062
英文摘要

In the Sonoran Desert, cacti represent a potentially important source of nutrients and water for consumers. Columnar cacti, in particular, produce a large pulse of flowers and succulent fruit during hot summer months. The importance of cactus stems, flowers and fruit to the small mammal community has not been quantified. We exploited natural variation in the carbon isotope (delta C-13) values of cacti (CAM) versus C-3 plants to quantify the relative use of these resources by a diverse desert small mammal community. We also estimated trophic level by measuring nitrogen isotope (delta N-15) values. We hypothesized that (H-1) granivorous heteromyids (kangaroo rats, pocket mice) would exploit the summer pulse of seeds and pulp; (H-2) folivorous and omnivorous cactus mice, wood rats, and ground squirrels would exploit cacti stems year-round and seeds when available; and (H-3) kangaroo rats and pocket mice would shift from seeds to insects during hot dry months. We found that heteromyids made minimal use of seeds during the period of heavy seed rain. Of the cricetids, only the folivore Neotoma albigula made continuous but highly variable use of cacti resources (annual mean = 32 %, range 0-81 %), whereas the omnivore Peromyscus eremicus ignored cacti except during the summer, when it exploited seeds and/or fruit pulp (June-July mean = 39 %, range 20-64 %). We also found little evidence for a shift to greater consumption of insects by heteromyids during the hot dry months. Overall, use of cactus resources by the small mammal community is very limited and highly variable among species.


英文关键词delta C-13 delta N-15 Sonoran Desert Stable isotopes Trophic level
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000358089400007
WOS关键词STABLE-ISOTOPES ; SAGUARO FRUIT ; DIET ; NITROGEN ; CARBON ; DELTA-N-15 ; WATER ; PHYSIOLOGY ; NEOTOMA ; HABITAT
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/189411
作者单位1.Univ Massachusetts, Dept Biol, Amherst, MA 01003 USA;
2.Univ Massachusetts, Dept Psychol, Amherst, MA 01003 USA;
3.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA
推荐引用方式
GB/T 7714
Orr, Teri J.,Newsome, Seth D.,Wolf, Blair O.. Cacti supply limited nutrients to a desert rodent community[J],2015,178(4):1045-1062.
APA Orr, Teri J.,Newsome, Seth D.,&Wolf, Blair O..(2015).Cacti supply limited nutrients to a desert rodent community.OECOLOGIA,178(4),1045-1062.
MLA Orr, Teri J.,et al."Cacti supply limited nutrients to a desert rodent community".OECOLOGIA 178.4(2015):1045-1062.
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