干旱区生态环境知识资源中心(Arid): Are all patches worth exploring? Foraging desert birds do not rely on environmental indicators of seed abundance at small scales

Arid

DOI	10.1186/s12898-019-0242-z
	Are all patches worth exploring? Foraging desert birds do not rely on environmental indicators of seed abundance at small scales
	Milesi, Fernando A.1,2,3; Lopez de Casenave, Javier 1,2; Cueto, Victor R.1,2,4
通讯作者	Milesi, Fernando A.
来源期刊	BMC ECOLOGY
EISSN	1472-6785
出版年	2019
卷号	19
英文摘要	BackgroundConsumers should show strong spatial preferences when foraging in environments where food availability is highly heterogeneous and predictable. Postdispersal granivores face this scenario in most arid areas, where soil seed bank abundance and composition associates persistently with vegetation structure at small scales (decimetres to metres). Those environmental features should be exploited as useful pre-harvest information, at least to avoid patches predicted to be poor. However, we did not find the expected spatial association in the algarrobal of the central Monte desert by observing foraging seed-eating birds, a field technique influenced by how much they exploit visitedpatches. In this work we tested if the first stage of foraging by granivorous birds (patch visit, encounter or exploration) is positively associated with environmental indicators of patch quality by recording the removal of single seeds from 300 scattered experimental devices during seasonal trials. Spatial selectivity was analysed by comparing the structural characteristics of used vs. available microhabitats, and evaluated against bottom-up and top-down hypotheses based on our previous knowledge on local seed bank abundance, composition and dynamics. Their foraging activity was also explored for spatialautocorrelation and environmental correlates at bigger scales.ResultsPostdispersal granivorous birds were less selective in their use of foraging space than expected if microhabitat appearance were providing them relevant information to guide their search for profitable foraging patches. No microhabitat type, as defined by their vegetation structureand soil cover, remained safe from bird exploration. Analyses at bigger temporal and spatial scales proved more important to describe heterogeneity in seed removal.ConclusionsCloseness to tall trees, probably related to bird territoriality and reproduction or to their perception of predation risk, seemed to determine a first level of habitat selection, constraining explorable space. Then, microhabitat openness (rather than seed abundance) exerted some positive influence on which patches were more frequently visited among those accessible. Selective patterns by birds at small scales were closer to our predictions of a top-down spatial effect, with seed consumptioncreating or strengthening (and not responding to) the spatial pattern and dynamics of the seed bank.
英文关键词	Post-dispersal seed predation Field experiment Granivory Patch exploration Patch exploitation Soil seed bank Vegetation structure Environmental cues Predation risk Arid environments
类型	Article
语种	英语
国家	Argentina
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000472021400001
WOS关键词	CENTRAL MONTE DESERT ; SOUTH-AMERICAN DESERTS ; GRANIVOROUS BIRDS ; HABITAT SELECTION ; PREDATION RISK ; SMALL MAMMALS ; MULTIVARIATE-ANALYSIS ; FUNCTIONAL-RESPONSE ; STATISTICAL-METHODS ; MOVEMENT PATTERNS
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/2XILL650/214684
作者单位	1.Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Ecol Genet & Evoluc, Desert Community Ecol Res Team Ecodes, Piso 4,Pabellon 2,Ciudad Univ, Buenos Aires, DF, Argentina; 2.UBA, CONICET, IEGEBA, Piso 4,Pabellon 2,Ciudad Univ, Buenos Aires, DF, Argentina; 3.UNCo, CONICET, Grp Ecol Terr Neuquen, Inst Invest Biodiversidad & Medio Ambiente INIBIO, Junin De Los Andes, Neuquen, Argentina; 4.UNPSJB, CONICET, CIEMEP, Esquel, Chubut, Argentina
推荐引用方式 GB/T 7714	Milesi, Fernando A.,Lopez de Casenave, Javier,Cueto, Victor R.. Are all patches worth exploring? Foraging desert birds do not rely on environmental indicators of seed abundance at small scales[J],2019,19.
APA	Milesi, Fernando A.,Lopez de Casenave, Javier,&Cueto, Victor R..(2019).Are all patches worth exploring? Foraging desert birds do not rely on environmental indicators of seed abundance at small scales.BMC ECOLOGY,19.
MLA	Milesi, Fernando A.,et al."Are all patches worth exploring? Foraging desert birds do not rely on environmental indicators of seed abundance at small scales".BMC ECOLOGY 19(2019).