Arid
DOI10.1007/s10144-015-0530-1
Variation of morphological and chemical traits in sexes of the dioecious perennial grass Poa ligularis in relation to shrub cover and aridity in Patagonian ecosystems
Moreno, Laura1; Bertiller, Monica B.1,2
通讯作者Moreno, Laura
来源期刊POPULATION ECOLOGY
ISSN1438-3896
EISSN1438-390X
出版年2016
卷号58期号:1页码:189-197
英文摘要

Sexes of dioecious species may have dimorphic responses to environmental variation due to differences in resource requirements and reproductive costs. We analyzed the effect of aridity/relative shrub cover, and vicinity to shrub patches on morpho-chemical traits of sexes of the dioecious perennial grass Poa ligularis in patchy arid ecosystems in northern-central Patagonia. We hypothesized that sexes of P. ligularis have dimorphic responses in morpho-chemical traits in relation to the environmental variation induced by aridity/relative shrub cover and vicinity to shrub patches. We selected seven sites across a gradient of increasing aridity and relative shrub cover. We randomly collected 5-10 P. ligularis plants per site registering the sex (female or male) and location with respect to shrub patches (shrub patch or inter-patch). For each plant, we assessed morpho-chemical traits (height of the vegetative tillers, length/dry weight/area of blades, specific blade area, nitrogen and soluble phenol concentration in blades). Sexes showed dimorphic responses in height of vegetative tillers, blade length, and blade area with respect to vicinity to shrub patches; and in variation of soluble phenolics in blades in relation to aridity/relative shrub cover. Responses in both sexes were opposite to those expected by aridity, highlighting the role of favorable environments induced by shrub canopies on dimorphic responses of sexes of P. ligularis. Resource-rich microsites associated with shrub canopies promoted increased plant performance of females with high reproductive costs while resource-poor open areas, favorable for pollen dispersal, induced improved chemical defenses of males. These results are consistent with the resource availability hypothesis.


英文关键词Arid Patagonia Inter-patch areas Plant defenses Sexual dimorphism Shrub patches Vegetative growth
类型Article
语种英语
国家Argentina
收录类别SCI-E
WOS记录号WOS:000367807500017
WOS关键词CARBON-ISOTOPE DISCRIMINATION ; TREE ILEX-AQUIFOLIUM ; NORTHERN PATAGONIA ; PHENOTYPIC PLASTICITY ; FUNCTIONAL TRAITS ; SHORTGRASS STEPPE ; SEXUAL-DIMORPHISM ; SPATIAL-PATTERNS ; PATCH STRUCTURE ; ARGENTINA
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/2XILL650/195713
作者单位1.Consejo Nacl Invest Cient & Tecn, Ctr Nacl Patagon CENPAT, Puerto Madryn, Chubut, Argentina;
2.Univ Nacl Patagonia UNPSJB, Puerto Madryn, Chubut, Argentina
推荐引用方式
GB/T 7714
Moreno, Laura,Bertiller, Monica B.. Variation of morphological and chemical traits in sexes of the dioecious perennial grass Poa ligularis in relation to shrub cover and aridity in Patagonian ecosystems[J],2016,58(1):189-197.
APA Moreno, Laura,&Bertiller, Monica B..(2016).Variation of morphological and chemical traits in sexes of the dioecious perennial grass Poa ligularis in relation to shrub cover and aridity in Patagonian ecosystems.POPULATION ECOLOGY,58(1),189-197.
MLA Moreno, Laura,et al."Variation of morphological and chemical traits in sexes of the dioecious perennial grass Poa ligularis in relation to shrub cover and aridity in Patagonian ecosystems".POPULATION ECOLOGY 58.1(2016):189-197.
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