The gene flow shown in the haplotype network represents an ancestral polymorphism, since the shared haplotypes are distributed over long geographic distances, as can be seen in dm 3 (H11) that occurs in Rio Grande do Piaui/PI (Cerrado) and Xacriaba Amerindian reservations/MG (Cerrado/Caatinga ecotone) (latitudes 07degrees 45' S-14degrees 53' S). An ecotone is a zone of junction or a transition area between two biomes (diverse ecosystems). Ecotone is the zone where two.

. 162 DownloadsPart of thebook series (DIHY, volume 105) AbstractWe attempt to identify general properties of ecotones. Earlier attempts to do so encountered difficulties resulting from contradictory conceptions of ecotones. Thus, we begin with and center our discussion on a definition of ecotone. The definition is complex.

It includes scaling, structural, and functional aspects. Based on this complex definition, we offer a brief review of what is an ecotone, what attributes it has, and how it influences other habitats of interest.

We identify feedback as a possibly important but ignored function of ecotones. This discussion is presented in general terms which apply to a variety of ecological situations.

We point out that results of an evaluation of ecotone attributes largely depends on the spatial and temporal scale at which ecotone is conceptualized and data are collected. We suggest that some of ecotone determinants scale naturally in a repeatable fashion among various aquatic systems. Finally, we point to the concentration of dynamic properties of ecotones as applied to land/water interface.

An ecotone is an ecological transition zone between several ecosystems.

For example, an nThis mixture results in a very steep gradient of physico-chemical properties of the water, varying in space and time.','url':'dico/d/earth-estuary-50001425/','contentid':'50001425','cropped':false,'imagetag':','matchindex':'u221ef43688f1ec9ad65c085f063a13abf37fu221e','matchcontent':'estuary'}' fs:xt:clicktype='N' fs:xt:clickname='clic-content::definition::50001425-Estuary'>estuary zone is an ecotone between the marine ecosystem, the river ecosystem and the land ecosystem.

The progressive or irregular variation of hydrological, pedological or even thermal parameters along the borders of the ecosystems concerned generates a mosaic of habitats with an inter-penetration of flora and fauna between these ecosystems.

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Ecotones therefore shelter nSpecies are the fundamental units of classification, which groups living beings together by common morphological, anatomical, physiological, biochemical and genetic..','url':'dico/d/zoology-species-50000452/','contentid':'50000452','cropped':true,'imagetag':','matchindex':'u221ec9d89dd1d504cd7a11d04d1d0badf12du221e','matchcontent':'species'}' fs:xt:clicktype='N' fs:xt:clickname='clic-content::definition::50000452-Species'>species and communities from the different areas surrounding them, as well as particular communities that are unique to the ecotone. The latter are generally distributed in microclimatic or physical-chemical transition zones (nSalinity is..','url':'dico/d/chemistry-salinity-50003425/','contentid':'50003425','cropped':true,'imagetag':','matchindex':'u221ee374837abd6d571a70c1a1d60fa0de5cu221e','matchcontent':'salinity'}' fs:xt:clicktype='N' fs:xt:clickname='clic-content::definition::50003425-Salinity'>salinity gradients, humidity..). These zones are called ecoclines.

Ecotones are therefore environments that are very rich in ','matchindex':'u221ed6387b4031ff1980954cda2a664e56a5u221e','matchcontent':'biodiversity'}' fs:xt:clicktype='N' fs:xt:clickname='clic-content::definition::50000360-Biodiversity'>biodiversity and, consequently, very vulnerable.

A riparian area constitutes an ecotone between the forest ecosystem and the aquatic ecosystem. © Jantyp, Wikimédia CC by-sa 3.0