Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub

(1) Sex ratio, plant size, spatial distribution and host-plant selection have been examined in three south-western Spanish populations of Osyris quadriparrira (Santala­ ceae), a hemiparasitic dioecious shrub of mediterranean habitats. The three populations are distributed along an environmental grad...

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Detalles Bibliográficos
Autor: Herrera, Carlos M.
Tipo de recurso: artículo
Fecha de publicación:1989
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/44783
Acceso en línea:http://hdl.handle.net/10261/44783
Access Level:acceso abierto
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spelling Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious ShrubHerrera, Carlos M.(1) Sex ratio, plant size, spatial distribution and host-plant selection have been examined in three south-western Spanish populations of Osyris quadriparrira (Santala­ ceae), a hemiparasitic dioecious shrub of mediterranean habitats. The three populations are distributed along an environmental gradient characterized by variation in water availability and soil fertility. (2) Sex ratios do not depart significantly from 1: 1 in any of the populations studied. There is no significant spatial segregation of plants of the two sexes in any population, as assessed by nearest-neighbour analyses. (3) Significant dimorphism in plant size was found at one of the sites, where males were significantly larger than females. (4) The positive correlation between combined plant size and distance of separation of neighbours provides evidence for intraspecific competition in this species. The effect of intersexual competition is greater than the effect of intrasexual competition between males, but it is similar to the effect of intrasexual competition between females. Females apparently have a greater competitive effect on males than other males. (5) Males and females are similar in their proportional use of host-plant species at two sites, and differ significantly at the other locality. (6) These results provide no evidence for niche differentiation of the sexes of 0. quadriparrita along an environmental gradient defined by abiotic factors (moisture, soil nutrients), but favour the view of small-scale segregation based on differential utilization of host-plants. It is suggested that niche differentiation in parasitic dioecious plants is most likely to occur along biologically rather than physically defined environmental gradientsPeer reviewedBritish Ecological Society201220121989info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/44783reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://www.jstor.org/stable/2260628info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/447832026-05-22T06:33:51Z
dc.title.none.fl_str_mv Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub
title Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub
spellingShingle Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub
Herrera, Carlos M.
title_short Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub
title_full Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub
title_fullStr Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub
title_full_unstemmed Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub
title_sort Plant Size, Spacing Patterns, and Host-Plant Selection in Osyris Quadripartita, a Hemiparasitic Dioecious Shrub
dc.creator.none.fl_str_mv Herrera, Carlos M.
author Herrera, Carlos M.
author_facet Herrera, Carlos M.
author_role author
description (1) Sex ratio, plant size, spatial distribution and host-plant selection have been examined in three south-western Spanish populations of Osyris quadriparrira (Santala­ ceae), a hemiparasitic dioecious shrub of mediterranean habitats. The three populations are distributed along an environmental gradient characterized by variation in water availability and soil fertility. (2) Sex ratios do not depart significantly from 1: 1 in any of the populations studied. There is no significant spatial segregation of plants of the two sexes in any population, as assessed by nearest-neighbour analyses. (3) Significant dimorphism in plant size was found at one of the sites, where males were significantly larger than females. (4) The positive correlation between combined plant size and distance of separation of neighbours provides evidence for intraspecific competition in this species. The effect of intersexual competition is greater than the effect of intrasexual competition between males, but it is similar to the effect of intrasexual competition between females. Females apparently have a greater competitive effect on males than other males. (5) Males and females are similar in their proportional use of host-plant species at two sites, and differ significantly at the other locality. (6) These results provide no evidence for niche differentiation of the sexes of 0. quadriparrita along an environmental gradient defined by abiotic factors (moisture, soil nutrients), but favour the view of small-scale segregation based on differential utilization of host-plants. It is suggested that niche differentiation in parasitic dioecious plants is most likely to occur along biologically rather than physically defined environmental gradients
publishDate 1989
dc.date.none.fl_str_mv 1989
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/44783
url http://hdl.handle.net/10261/44783
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://www.jstor.org/stable/2260628
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv British Ecological Society
publisher.none.fl_str_mv British Ecological Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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