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Array ( [TITRE] => <b>Type de document : </b> [TITRE_CLEAN] => Type de document [OPAC_SHOW] => 1 [TYPE] => list [AFF] => Mémoire [ID] => 4 [NAME] => cp_typdoc [DATATYPE] => integer [VALUES] => Array ( [0] => 4 ) )
![Effects of phenology and microclimate on the seed set of Anemone nemorosa](https://infodoc.agroparistech.fr/img_cache/pmb_agroparistech_record_222642.webp)
Titre : |
Effects of phenology and microclimate on the seed set of Anemone nemorosa
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Auteur(s) : |
Laurent Risser, Auteur
Erik OCKINGER, Responsable de stage AgroParisTech, Organisme de soutenance |
Type de document : | Mémoire |
Filière : | M. : EFT -- Ecologie des Forêts Tropicales |
Sujets : | Anémone ; Suède ; Graine ; Changement climatique ; Floraison ; Floraison induite ; Montée en graine |
Résumé : |
Changing climate affects the distribution and phenology of plants and pollinators.Especially in the spring, climate warming accelerates the timing of flowering and insect emergence. Temporal mismatch is a fairly well-studied biological process. However the process has been studied only for a small number of systems and organisms, and we need better empirical evidence. Due to the lack of studies, we only know that mismatch can have dramatic impact on the decreasing seed production and species can be affected differentially. Our study investigate show the microclimate and flowering time can have an impact on the seed set. By using a wild flower (Anemone nemerosa), we investigate the impact of the pollinator on the seed production at two different time points. Three treatments have been [...]
Changing climate affects the distribution and phenology of plants and pollinators.Especially in the spring, climate warming accelerates the timing of flowering and insect emergence. Temporal mismatch is a fairly well-studied biological process. However the process has been studied only for a small number of systems and organisms, and we need better empirical evidence. Due to the lack of studies, we only know that mismatch can have dramatic impact on the decreasing seed production and species can be affected differentially. Our study investigate show the microclimate and flowering time can have an impact on the seed set. By using a wild flower (Anemone nemerosa), we investigate the impact of the pollinator on the seed production at two different time points. Three treatments have been applied: Self-pollination; Hand-pollinationand Wild-pollination, during two time periods, one in mid of April (early spring) and the other in early May (late spring). Pollinator abundance was observed at the place where the treatments were applied. After harvesting most of the flowers, the seeds were counted. Our results show that the flowering time has a significant effect on fertile seed production, but microclimate has no significant effect. The lower abundance of pollinators early in spring leads to reduced seed set forearly-flowering plants. We found that the flowers produce less seeds in early spring than in latespring. A model testing the relationship between pollinator diversity and seed set have been developed, but due to the lack of sufficient data, no significant relationship were been found. In conclusion, our study showed that the flowering time and microclimate have an effect on the seed set, and we can use this to speculate about the effects of climate change.
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Date de publication : | 2015 |
Format : | 27 p. / ill. coul., graph. coul., graph. n&b., photo coul. |
Langue(s) : | Anglais |
Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=222642 |
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