Taxón restringido a una única localidad. Hábitat reducido y degradado por puesta en cultivo y rot... more Taxón restringido a una única localidad. Hábitat reducido y degradado por puesta en cultivo y roturación del terreno
Identificación Herbácea perenne con roseta. Hojas anchamente oblolanceoladas, a veces marchitas e... more Identificación Herbácea perenne con roseta. Hojas anchamente oblolanceoladas, a veces marchitas en la antesis. Indumento corto, papiloso. Escapos escasos, de 8-45 cm, zigzagueantes, ramificados desde el cuarto inferior. Ramas de primer orden divarica-das, las inferiores a veces estériles y cortas, las superiores casi patentes. Cáliz 3,8-4,4 mm, con tubo densamente peloso, limbo rasgado después de la antesis. Corola con cinco pétalos libres, de 7,7-8 x 2,1-3 mm, cuneiformes, violáceo-rojizos pálidos 1 . Distribución Restringida a una única localidad junto a la La-guna de Alcahozo, inmediaciones de Pedro Mu-ñoz, provincia de Ciudad Real 1,2,3 . Biología Flores visitadas principalmente por dípteros, hi-menópteros, coleópteros y lepidópteros. Al tra-tarse de una especie triploide, es muy probable que todos los individuos de la población perte-nezcan a un único morfotipo autoincompatible, que el polen sea poco fértil y que las semillas se originen por apomixis 4 . Los individuos tienen u...
Summary Plant hybridization is one of the most controversial aspects in plant conservation. Sever... more Summary Plant hybridization is one of the most controversial aspects in plant conservation. Several kinds of habitat change and alien species can increase the probability and rate of hybridization and therefore it has become a subject of recent attention. Additionally, the recognition of the historical role of hybridization as an evolutionary process has cause a re-evaluation of conservation policies. However, hybridization can also be a threat to the long-term persistence of scarce or protected species, through assimilation or outbreeding depression and thus, the predominant view is the negative scenario in which it has contributed to the extinction of many species through direct and indirect means. Although these scenarios are contradictory it seems clear that management guidelines are necessary to deal with these situations. In this work, we present some procedures for the natural hybrid, N. x perezlarae, as well as some guidelines to help in management decisions.
Flower longevity, the period of time that a flower remains open, is a crucial factor in plant rep... more Flower longevity, the period of time that a flower remains open, is a crucial factor in plant reproductive fitness. Though longevity varies substantially among angiosperm species, longer flower longevities may be a selective advantage under unpredictable or scarce pollination activity. This study examined this hypothesis in Narcissus serotinus L. (Amarylli-daceae), a small Mediterranean geophyte that blooms during the autumnal rainy season. Field experiments performed in three natural populations through 3 consecutive years shows that N. serotinus has the ability to expand flower longevity when pollination has not occurred. Flowers that were open longer to pollination have higher reproductive fitness than younger flowers. As N. serotinus flowers age, there was a shift in pollination patterns since flower visits by butterflies be-came scarcer and are replaced by one small pollen beetle. Given that there was evidence of pollen limitation and that this species produces one single flowe...
Taxón restringido a una única localidad. Hábitat reducido y degradado por puesta en cultivo y rot... more Taxón restringido a una única localidad. Hábitat reducido y degradado por puesta en cultivo y roturación del terreno
Identificación Herbácea perenne con roseta. Hojas anchamente oblolanceoladas, a veces marchitas e... more Identificación Herbácea perenne con roseta. Hojas anchamente oblolanceoladas, a veces marchitas en la antesis. Indumento corto, papiloso. Escapos escasos, de 8-45 cm, zigzagueantes, ramificados desde el cuarto inferior. Ramas de primer orden divarica-das, las inferiores a veces estériles y cortas, las superiores casi patentes. Cáliz 3,8-4,4 mm, con tubo densamente peloso, limbo rasgado después de la antesis. Corola con cinco pétalos libres, de 7,7-8 x 2,1-3 mm, cuneiformes, violáceo-rojizos pálidos 1 . Distribución Restringida a una única localidad junto a la La-guna de Alcahozo, inmediaciones de Pedro Mu-ñoz, provincia de Ciudad Real 1,2,3 . Biología Flores visitadas principalmente por dípteros, hi-menópteros, coleópteros y lepidópteros. Al tra-tarse de una especie triploide, es muy probable que todos los individuos de la población perte-nezcan a un único morfotipo autoincompatible, que el polen sea poco fértil y que las semillas se originen por apomixis 4 . Los individuos tienen u...
Summary Plant hybridization is one of the most controversial aspects in plant conservation. Sever... more Summary Plant hybridization is one of the most controversial aspects in plant conservation. Several kinds of habitat change and alien species can increase the probability and rate of hybridization and therefore it has become a subject of recent attention. Additionally, the recognition of the historical role of hybridization as an evolutionary process has cause a re-evaluation of conservation policies. However, hybridization can also be a threat to the long-term persistence of scarce or protected species, through assimilation or outbreeding depression and thus, the predominant view is the negative scenario in which it has contributed to the extinction of many species through direct and indirect means. Although these scenarios are contradictory it seems clear that management guidelines are necessary to deal with these situations. In this work, we present some procedures for the natural hybrid, N. x perezlarae, as well as some guidelines to help in management decisions.
Flower longevity, the period of time that a flower remains open, is a crucial factor in plant rep... more Flower longevity, the period of time that a flower remains open, is a crucial factor in plant reproductive fitness. Though longevity varies substantially among angiosperm species, longer flower longevities may be a selective advantage under unpredictable or scarce pollination activity. This study examined this hypothesis in Narcissus serotinus L. (Amarylli-daceae), a small Mediterranean geophyte that blooms during the autumnal rainy season. Field experiments performed in three natural populations through 3 consecutive years shows that N. serotinus has the ability to expand flower longevity when pollination has not occurred. Flowers that were open longer to pollination have higher reproductive fitness than younger flowers. As N. serotinus flowers age, there was a shift in pollination patterns since flower visits by butterflies be-came scarcer and are replaced by one small pollen beetle. Given that there was evidence of pollen limitation and that this species produces one single flowe...
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