Arid
DOI10.1650/CONDOR-17-61.1
Diet switching of seed-eating birds wintering in grazed habitats of the central Monte Desert, Argentina
Marone, Luis1,2; Olmedo, Matias1; Valdes, Daniela Y.1; Zarco, Agustin1,2; Lopez de Casenave, Javier3,4; Pol, Rodrigo G.1,2
通讯作者Marone, Luis
来源期刊CONDOR
ISSN0010-5422
EISSN1938-5129
出版年2017
卷号119期号:4页码:673-682
英文摘要

Although bird population declines associated with land degradation are common, the initial response of organisms to rapid human-induced environmental change is usually behavioral. Reductions in seed availability due to cattle grazing may trigger diet switching in seed-eating birds, but empirical examples of such behavior are lacking. We asked whether cattle grazing changed the composition and reduced the size of seed reserves, and whether seed shortage caused diet shifts in 4 species of seed-eating birds wintering in the central Monte Desert, Argentina. We assessed the soil seed bank composition and the granivorous fraction of each species’ diet. Digestive tract or crop contents were obtained by using the flushing method on individuals captured with mist nets, and seeds were sorted and assigned to 1 of 3 functional groups (small grass seeds, large and medium-sized grass seeds, or forb seeds). Cattle grazing reduced the abundance of the preferred large and medium-sized grass seeds by 60-90%. The grass-seed specialists Many colored Chaco Finch (Saltatricula multicolor) and Ringed Warbling-Finch (Microspingus torquatus) did not change their diets in grazed areas, but the expanding specialists Common Diuca-Finch (Diuca diuca) and Rufous-collared Sparrow (Zonotrichia capensis) incorporated increased proportions of small grass seeds as well as forb seeds into their diets. These results were correctly predicted from species-specific differences in feeding flexibility previously established in cafeteria experiments. Based on species-specific diet composition, the energy reward of seeds by unit mass consumed decreased moderately (5-21%) in the grazed sites for S. multicolor, M. torquatus, and D. diuca. Starch content was similar between grazing conditions for all 3 birds. Although such deficits might be compensated for by a slight increase in absolute mass of seeds or alternative food items consumed in degraded lands, substantial reduction in the availability of grass seeds may reduce the capacity of degraded lands to support specialist granivorous birds.


英文关键词feeding flexibility expanding specialists seed shortage seed preferences grass seeds forb seeds energetics land degradation
类型Article
语种英语
国家Argentina
收录类别SCI-E
WOS记录号WOS:000415752200003
WOS关键词DIGESTIVE PHYSIOLOGY ; BEHAVIORAL-RESPONSES ; ENVIRONMENTAL-CHANGE ; GRANIVOROUS BIRDS ; FEEDING ECOLOGY ; COMPETITION ; SELECTION ; PREY ; FLEXIBILITY ; ASSEMBLAGES
WOS类目Ornithology
WOS研究方向Zoology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198190
作者单位1.IADIZA CONICET, Ecodes Desert Community Ecol Res Team, Mendoza, Argentina;
2.Univ Nacl Cuyo, Fac Ciencias Exactas & Nat, Mendoza, Argentina;
3.Univ Buenos Aires, Ecodes Desert Community Ecol Res Team, Dept Ecol Genet & Evoluc, Fac Ciencias Exactas & Nat, Buenos Aires, DF, Argentina;
4.IEGEBA UBA CONICET, Buenos Aires, DF, Argentina
推荐引用方式
GB/T 7714
Marone, Luis,Olmedo, Matias,Valdes, Daniela Y.,et al. Diet switching of seed-eating birds wintering in grazed habitats of the central Monte Desert, Argentina[J],2017,119(4):673-682.
APA Marone, Luis,Olmedo, Matias,Valdes, Daniela Y.,Zarco, Agustin,Lopez de Casenave, Javier,&Pol, Rodrigo G..(2017).Diet switching of seed-eating birds wintering in grazed habitats of the central Monte Desert, Argentina.CONDOR,119(4),673-682.
MLA Marone, Luis,et al."Diet switching of seed-eating birds wintering in grazed habitats of the central Monte Desert, Argentina".CONDOR 119.4(2017):673-682.
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