The selection of stubble fields by wintering granivorous birds reflects vegetation cover and food abundance

被引:184
作者
Moorcroft, D [2 ]
Whittingham, MJ
Bradbury, RB
Wilson, JD
机构
[1] Univ Oxford, Dept Zool, Edward Grey Inst Ornithol, Oxford OX1 3PS, England
[2] Royal Soc Protect Birds, Sandy SG19 2DL, Beds, England
[3] RSPB Scotland, Edinburgh EH4 3TP, Midlothian, Scotland
关键词
agricultural intensification; conservation; food availability; granivorous passerines; set-aside;
D O I
10.1046/j.1365-2664.2002.00730.x
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
1. Fields left fallow after harvest (i.e. stubble fields) support high wintering densities of many species of granivorous bird. We examined correlates of use by eight such species of different types of intensively managed wheat and barley stubble fields, organic wheat fields and set-aside fields on mixed lowland farmland in central England. Field occupancy was studied in relation to the physical characteristics of fields and seed abundance. 2. Higher seed abundance was associated with greater occupancy by linnet Carduelis cannabina, grey partridge Perdix perdix, chaffinch Fringilla coelebs, yellowhammer Emberiza citrinella, reed bunting Emberiza schoeniclus and corn bunting Miliaria calandra. Larger areas of bare earth within stubble fields were associated with greater occupancy by linnet, yellowhammer, reed bunting and corn bunting, but lower occupancy by woodpigeon Columba palumbus. 3. On conventional intensively farmed sites, seed abundance and area of bare earth were significantly greater on barley stubbles than on wheat stubbles. 4. Seed numbers fell throughout the winter in all stubble types, although reductions were greatest on intensive barley stubbles, intermediate on intensive wheat stubble and lowest on undersown organic wheat stubbles. 5. Within fields occupied by linnets, areas used for feeding had significantly greater quantities of seeds known to be important in their diet. Feeding areas also had a greater area of bare earth than randomly selected 'non-feeding areas'. 6. Linnets and reed buntings were rarely found on fields where densities of weed seeds important in their diets fell below 250 seeds m(-2). In autumn, yellowhammers and grey partridges rarely fed on fields where cereal grain density was below 50 m(-2). However, in spring, both species fed on these fields irrespective of grain density, perhaps indicating a switch to other food sources. 7. We suggest that land managers wishing to maximize the value of overwinter stubble fields for granivorous birds locate such fields where there is a substantial natural regeneration of weed flora and where previous cropping (e.g. barley) is likely to offer a sparse stubble with substantial areas of bare ground.
引用
收藏
页码:535 / 547
页数:13
相关论文
共 56 条
[1]   The weed seed bank of soils in a landscape segment in southern Bavaria .1. Seed content, species composition and spatial variability [J].
Albrecht, H ;
Forster, EM .
VEGETATIO, 1996, 125 (01) :1-10
[2]  
[Anonymous], SEED IDENTIFICATION
[3]  
Barker AM, 1997, PROC BRIGHTON CROP, P1191
[4]  
Bauer Hans-Guenther, 1996, Ornithologischer Anzeiger, V35, P127
[5]   FACTORS INFLUENCING THE PRECISION OF SOIL SEED BANK ESTIMATES [J].
BENOIT, DL ;
KENKEL, NC ;
CAVERS, PB .
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE, 1989, 67 (10) :2833-2840
[6]  
BRICKLE N, 1998, THESIS U SUSSEX BRIG
[7]   Use of set-aside land in winter by declining farmland bird species in the UK [J].
Buckingham, DL ;
Evans, AD ;
Morris, AJ ;
Orsman, CJ ;
Yaxley, R .
BIRD STUDY, 1999, 46 :157-169
[8]  
Bullock James, 1996, P111
[9]   Changes in the abundance of farmland birds in relation to the timing of agricultural intensification in England and Wales [J].
Chamberlain, DE ;
Fuller, RJ ;
Bunce, RGH ;
Duckworth, JC ;
Shrubb, M .
JOURNAL OF APPLIED ECOLOGY, 2000, 37 (05) :771-788
[10]  
Clarke JH, 1997, PROC BRIGHTON CROP, P1179