Limits...
Sources and sinks of diversification and conservation priorities for the Mexican tropical dry forest.

Becerra JX, Venable DL - PLoS ONE (2008)

Bottom Line: Results indicate that vast areas of the forest have historically functioned as diversity sinks, generating few or no extant Bursera lineages.Only a few areas have functioned as major engines of diversification.Long-term preservation of biodiversity may be promoted by incorporation of such knowledge in decision-making.

View Article: PubMed Central - PubMed

Affiliation: Department of Biosphere 2, University of Arizona, Tucson, Arizona, USA. becerra@ag.arizona.edu

ABSTRACT
Elucidating the geographical history of diversification is critical for inferring where future diversification may occur and thus could be a valuable aid in determining conservation priorities. However, it has been difficult to recognize areas with a higher likelihood of promoting diversification. We reconstructed centres of origin of lineages and identified areas in the Mexican tropical dry forest that have been important centres of diversification (sources) and areas where species are maintained but where diversification is less likely to occur (diversity sinks). We used a molecular phylogeny of the genus Bursera, a dominant member of the forest, along with information on current species distributions. Results indicate that vast areas of the forest have historically functioned as diversity sinks, generating few or no extant Bursera lineages. Only a few areas have functioned as major engines of diversification. Long-term preservation of biodiversity may be promoted by incorporation of such knowledge in decision-making.

Show MeSH
Source and sink areas for diversification.Sub-areas plotted in rank order of number of extant species. The sub-area with the greatest number of extant species and endemisms is different from that with the greatest number of diversifications.
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pone-0003436-g003: Source and sink areas for diversification.Sub-areas plotted in rank order of number of extant species. The sub-area with the greatest number of extant species and endemisms is different from that with the greatest number of diversifications.

Mentions: Results show that diversification of Bursera seems to have been concentrated in only a few of the 11 geographic sub-areas. Vast areas where species are now present seem to have mostly functioned as diversity sinks (Fig. 3). The majority of the Bursera lineages originated in the southwest region, which our results suggest has functioned as a major engine of diversification of the genus. Additional diversification occurred in the two areas that encompass the depression of the Balsas river (Balsas East and Balsas West), and at a lesser extent, in the Oaxaca region. In the past 10 million years about 23 species originated in the southwest sub-area, about 15 in Balsas East, and 8 in Balsas West. In contrast, all of the remaining areas including the Pacific coast, High plateau and Sonoran Desert (Northwest region) have had marginal numbers of diversifications with some of the sub-areas having none.


Sources and sinks of diversification and conservation priorities for the Mexican tropical dry forest.

Becerra JX, Venable DL - PLoS ONE (2008)

Source and sink areas for diversification.Sub-areas plotted in rank order of number of extant species. The sub-area with the greatest number of extant species and endemisms is different from that with the greatest number of diversifications.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2562985&req=5

pone-0003436-g003: Source and sink areas for diversification.Sub-areas plotted in rank order of number of extant species. The sub-area with the greatest number of extant species and endemisms is different from that with the greatest number of diversifications.
Mentions: Results show that diversification of Bursera seems to have been concentrated in only a few of the 11 geographic sub-areas. Vast areas where species are now present seem to have mostly functioned as diversity sinks (Fig. 3). The majority of the Bursera lineages originated in the southwest region, which our results suggest has functioned as a major engine of diversification of the genus. Additional diversification occurred in the two areas that encompass the depression of the Balsas river (Balsas East and Balsas West), and at a lesser extent, in the Oaxaca region. In the past 10 million years about 23 species originated in the southwest sub-area, about 15 in Balsas East, and 8 in Balsas West. In contrast, all of the remaining areas including the Pacific coast, High plateau and Sonoran Desert (Northwest region) have had marginal numbers of diversifications with some of the sub-areas having none.

Bottom Line: Results indicate that vast areas of the forest have historically functioned as diversity sinks, generating few or no extant Bursera lineages.Only a few areas have functioned as major engines of diversification.Long-term preservation of biodiversity may be promoted by incorporation of such knowledge in decision-making.

View Article: PubMed Central - PubMed

Affiliation: Department of Biosphere 2, University of Arizona, Tucson, Arizona, USA. becerra@ag.arizona.edu

ABSTRACT
Elucidating the geographical history of diversification is critical for inferring where future diversification may occur and thus could be a valuable aid in determining conservation priorities. However, it has been difficult to recognize areas with a higher likelihood of promoting diversification. We reconstructed centres of origin of lineages and identified areas in the Mexican tropical dry forest that have been important centres of diversification (sources) and areas where species are maintained but where diversification is less likely to occur (diversity sinks). We used a molecular phylogeny of the genus Bursera, a dominant member of the forest, along with information on current species distributions. Results indicate that vast areas of the forest have historically functioned as diversity sinks, generating few or no extant Bursera lineages. Only a few areas have functioned as major engines of diversification. Long-term preservation of biodiversity may be promoted by incorporation of such knowledge in decision-making.

Show MeSH