@article {guitian1993biologia, title = {Biolog{\'\i}a y conservaci{\'o}n de Petrocoptis grandiflora en el Noroeste Ib{\'e}rico}, journal = {Botanica complutensis}, volume = {18}, number = {18}, year = {1993}, pages = {123{\textendash}128}, publisher = {Servicio de Publicaciones}, abstract = {

Se dan a conocer algunos datos b\ásicos sobre la situaci\ón actual de las poblaciones de Petrocoptis grandiflora\ en el NW Ib\érico y sobre su Biolog\ía (Fenolog\ía, Polinizaci\ón, Fructificaci\ón y Dispersi\ón). Finalmenle se se\ñala la necesidad de profundizar en el conocimiento de la Biolog\ía Reproductiva de los endemismos ib\éricos como paso previo al establecimiento de medidas de protecci\ón eficaces.

}, keywords = {Biolog{\'\i}a de la reproducci{\'o}n, Conservaci{\'o}n, Petroroptis grandilora}, url = {http://revistas.ucm.es/index.php/BOCM/article/view/BOCM9393110123A/6501}, author = {Guiti{\'a}n, Pablo and Rivera, Javier Guiti{\'a}n and S{\'a}nchez, Jos{\'e} Mar{\'\i}{\i}a} } @article {doi:10.1139/b96-178, title = {Allocation of reproductive resources within inflorescences of Petrocoptis grandiflora (Caryophyllaceae)}, journal = {Canadian Journal of Botany}, volume = {74}, number = {9}, year = {1996}, pages = {1482-1486}, abstract = {

Patterns of fruit set were studied in Petrocoptis grandiflora, a species endemic to the northwestern Iberian Peninsula. This plant has a dichasial inflorescence in which the central flower opens first, followed by first-order lateral flowers and then second-order lateral flowers. We investigated whether flowers at different positions in the inflorescence differ in duration, ovule number, nectar production, or probability of fruit set. Our results indicate that mean duration, ovule number, nectar volume, and probability of fruit set are higher for central than for lateral flowers. Fruit set was higher for central than for first-order lateral flowers, and higher for first- than for second-order lateral flowers. To investigate the effects of loss of the central flower, selected inflorescences were manually \"decentred.\" For lateral flowers, analysis of variance indicated that fruit set was affected both by flower position in the inflorescence and by decentring. However, neither total inflorescence fruit set nor mean duration of flowers in the inflorescence differed significantly between decentred and untreated inflorescences. These results suggest that the observed pattern of fruit set in this species is a result of within-inflorescence competition for the limited amount of resources available for fruit production, and that these resources may be redistributed in response to damage to flowers within the inflorescence. Inflorescences of P. grandiflora can thus be considered to act as semi-autonomous units with regard to resource allocation. Keywords: inflorescences, fruit set, resource allocation, Petrocoptis grandiflora.

}, doi = {10.1139/b96-178}, url = {http://www.nrcresearchpress.com/doi/abs/10.1139/b96-178}, author = {Guiti{\'a}n, Javier and Navarro, Luis} } @article {BOJ:BOJ19, title = {Pollination ecology of Petrocoptis grandiflora Rothm. (Caryophyllaceae); a species endemic to the north-west part of the Iberian Peninsula}, journal = {Botanical Journal of the Linnean Society}, volume = {115}, number = {1}, year = {1994}, pages = {19{\textendash}27}, publisher = {Blackwell Publishing Ltd}, abstract = {

Petrocoptis grandiflora Rothm. is a species endemic to the Iberian Peninsula with restricted distribution. We studied various aspects of its pollination ecology, nectar characteristics and standing crop, pollinators and nectar-robbers, and the effects of nectar robbing and supplementary pollination on fruit set. The nectar is moderately rich in saccharose (saccharose/hexose ratio 0.54), and is largely consumed by long-tongued bees (Anthophoridae). The incidence of nectar robbing by Xylocopa violncea differed between the four plant populations studied, and it had significant effects on fruit set when the population was simultaneously considered. Supplementary pollination did not improve fruit set significantly.

}, keywords = {Anthophoridae, Bombyliidae, nectar, nectar-robbers, Spain, Xylocopa}, issn = {1095-8339}, doi = {10.1111/j.1095-8339.1994.tb01764.x}, url = {http://dx.doi.org/10.1111/j.1095-8339.1994.tb01764.x}, author = {GUITI{\'A}N, J. and S{\'A}NCHEZ, J. M. and GUITI{\'A}N, P.} }