Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1650/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
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ISSN | 0010-5422 |
EISSN | 1938-5129 |
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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