Abstract:Tropiques, pp.7-15, 2010, 306(4). Photo 1. Le baobab produit généralement peu de fruits, mais de grande taille. La pulpe qui entoure les graines présente des qualités nutritives élevées. Sur ce cliché représentant A. rubrostipa, le faible effectif de fruits peut s'expliquer par la prédation de fruits non matures par le propithèque (Propithecus verreauxi). Photo J. Tassin.
Seheno Andriantsaralaza
“…However, this means of dispersal by man generally results in a different distribution pattern to that found in the Comoro Islands, a more isolated, more concentrated and less exclusively coastal one. Dispersal inland originating from the coastal trees is probably realised by zoochory through animal dispersers (rats and domestic animals) as suggested by Chevalier (1906) and Wickens and Lowe (2008), and as shown by Andriantsaralaza (2010) and Andriantsaralaza et al (2015) concerning A. rubrostipa and A. grandidieri, but also by man, as has been shown by Duvall (2007) and Dhillion and Gustad (2004) for A. digitata in Mali and in the Indian Ocean. This dispersal 1 3 occurs seed by seed and results in individuals from a single embryo, which are, therefore, single stemmed.…”
Your article is protected by copyright and all rights are held exclusively by International Society for Tropical Ecology. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".
“…However, this means of dispersal by man generally results in a different distribution pattern to that found in the Comoro Islands, a more isolated, more concentrated and less exclusively coastal one. Dispersal inland originating from the coastal trees is probably realised by zoochory through animal dispersers (rats and domestic animals) as suggested by Chevalier (1906) and Wickens and Lowe (2008), and as shown by Andriantsaralaza (2010) and Andriantsaralaza et al (2015) concerning A. rubrostipa and A. grandidieri, but also by man, as has been shown by Duvall (2007) and Dhillion and Gustad (2004) for A. digitata in Mali and in the Indian Ocean. This dispersal 1 3 occurs seed by seed and results in individuals from a single embryo, which are, therefore, single stemmed.…”
Your article is protected by copyright and all rights are held exclusively by International Society for Tropical Ecology. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".
“…giant lemurs) but they continue to display their dispersal syndromes (e.g. primate syndrome), a circumstance referred to as dispersal anachronism (Janzen & Martin, 1982; Guimarães et al, 2008; Andriantsaralaza et al, 2010). Plate 1Plant species displaying a bird syndrome: (a) Erythrina madagascariensis and (b) Commiphora sp.…”
Madagascar is one of the most threatened biodiversity hotspots, and protection of its biodiversity is becoming increasingly urgent as deforestation of the island continues. For the long-term success of conservation efforts it is essential that key ecological processes, such as seed dispersal, are protected and restored. Therefore, the identification of ecological gaps is a vital task. For Madagascar, only little is known about plant–animal interactions, and traditional methods of ecological research are too time-consuming to provide crucial information about breakdowns in these interactions. To identify likely dispersal gaps we therefore used a theoretical approach to analyse plant–disperser interactions in Madagascar. We used data science tools to impute missing data on relevant plant traits to subsequently predict the most likely dispersal agents for each of Madagascar's endemic plant species. We found that 38% of the endemic species (N = 8,784) are endozoochorous, and among these 26–41% display a primate syndrome and 17–19% a bird syndrome (depending on the definition of syndromes). This lower percentage of endozoochorous species and higher percentage of species with a primate syndrome in Madagascar compared to other tropical areas reflects the unusual disperser guild on the island. Only five bird species but 20 lemur species are frugivorous, and 16 of those lemur species are currently threatened with extinction. The disappearance of frugivorous lemurs would significantly change the vegetation dynamics of Madagascar's ecosystems, and a high proportion of Madagascar's endemic plants would enter an extinction vortex.
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