01181nas a2200193 4500008004100000245008100041210007100122260003000193300001400223490000700237520050900244653003400753653001800787653002700805100002000832700002900852700003000881856007600911 1993 eng d00aBiología y conservación de Petrocoptis grandiflora en el Noroeste Ibérico0 aBiología y conservación de Petrocoptis grandiflora en el Noroest bServicio de Publicaciones a123–1280 v183 a

Se dan a conocer algunos datos básicos sobre la situación actual de las poblaciones de Petrocoptis grandiflora en el NW Ibérico y sobre su Biología (Fenología, Polinización, Fructificación y Dispersión). Finalmenle se señala la necesidad de profundizar en el conocimiento de la Biología Reproductiva de los endemismos ibéricos como paso previo al establecimiento de medidas de protección eficaces.

10aBiología de la reproducción10aConservación10aPetroroptis grandilora1 aGuitián, Pablo1 aRivera, Javier, Guitián1 aSánchez, José, Maríıa uhttp://revistas.ucm.es/index.php/BOCM/article/view/BOCM9393110123A/650102167nas a2200133 4500008004100000245010800041210006900149300001400218490000700232520169500239100002101934700001801955856006001973 1996 eng d00aAllocation of reproductive resources within inflorescences of Petrocoptis grandiflora (Caryophyllaceae)0 aAllocation of reproductive resources within inflorescences of Pe a1482-14860 v743 a

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.

1 aGuitián, Javier1 aNavarro, Luis uhttp://www.nrcresearchpress.com/doi/abs/10.1139/b96-17801490nas a2200241 4500008004100000022001400041245014300055210006900198260002900267300001200296490000800308520073300316653001801049653001601067653001101083653001901094653001001113653001301123100001701136700002101153700001701174856005701191 1994 eng d a1095-833900aPollination ecology of Petrocoptis grandiflora Rothm. (Caryophyllaceae); a species endemic to the north-west part of the Iberian Peninsula0 aPollination ecology of Petrocoptis grandiflora Rothm Caryophylla bBlackwell Publishing Ltd a19–270 v1153 a

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.

10aAnthophoridae10aBombyliidae10anectar10anectar-robbers10aSpain10aXylocopa1 aGUITIÁN, J.1 aSÁNCHEZ, J., M.1 aGUITIÁN, P. uhttp://dx.doi.org/10.1111/j.1095-8339.1994.tb01764.x