Like a Mangrove out of Water: Dispersal Limitation and Adaptive Responses of Dominant Coastal Trees to Freshwater Limitation

概要

Invited Talk
Invited Talk 2

Like a Mangrove out of Water:
Dispersal Limitation and Adaptive Responses of Dominant Coastal
Trees to Freshwater Limitation
Gustavo Maruyama MORI
Department of Biological and Environmental Sciences, Institute of Biosciences,
São Paulo State University (UNESP), São Vicente, SP, Brazil

As climate changes, freshwater unavailability due to reducing precipitation, lower air humidity, and rising temperatures may
increase mass tree mortality not only in arid regions, but also in tropical and subtropical environments like mangroves forests. These
tree communities inhabit the habitats between land and sea and are composed by few broadly distributed plants whose populations
face high environmental heterogeneity, from arid to rainy/wet sites, and from subtropical to equatorial regions. Thus, mangroves
provide suitable models to unveil the mechanisms underlying trees adaptation to freshwater limitation. First, this presentation will be
focused on how geography and oceanography shape the dispersal of mangroves along the Brazilian coast. As intraspecific gene flow
is limited in this region, local adaptation is expected to take place as one observes contrasting environments, at different geographic
scales. Then, I will explore recent findings on the adaptive responses of two black mangroves species (Avicennia) across the Brazilian
coast to drought tolerance or response to hydric stress. Evidence of natural selection has also been observed at much smaller
geographic scale. There are signs of natural selection in A. germinans in response to abrupt limitation in access to soil freshwater,
after a road was constructed in the mid-70s. To conclude, there will be a brief discussion on how these findings may support
mangrove trees conservation and its associated challenges. ...

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