Founder takes all: density-dependent processes structure biodiversity
Density-dependent processes play a key role in the spatial structuring of biodiversity.
Specifically, interrelated demographic processes, such as gene surfing, high-density
blocking, and competitive exclusion, can generate striking geographic contrasts in the
distributions of genes and species. Here, we propose that well-studied evolutionary and
ecological biogeographic patterns of postglacial recolonization, progressive island
colonization, microbial sectoring, and even the 'Out of Africa'pattern of human expansion …
Specifically, interrelated demographic processes, such as gene surfing, high-density
blocking, and competitive exclusion, can generate striking geographic contrasts in the
distributions of genes and species. Here, we propose that well-studied evolutionary and
ecological biogeographic patterns of postglacial recolonization, progressive island
colonization, microbial sectoring, and even the 'Out of Africa'pattern of human expansion …
Density-dependent processes play a key role in the spatial structuring of biodiversity. Specifically, interrelated demographic processes, such as gene surfing, high-density blocking, and competitive exclusion, can generate striking geographic contrasts in the distributions of genes and species. Here, we propose that well-studied evolutionary and ecological biogeographic patterns of postglacial recolonization, progressive island colonization, microbial sectoring, and even the ‘Out of Africa' pattern of human expansion, are fundamentally similar, underpinned by a ‘founder takes all' density-dependent principle. Additionally, we hypothesize that older historic constraints of density-dependent processes are seen today in the dramatic biogeographic shifts that occur in response to human-mediated extinction events, whereby surviving lineages rapidly expand their ranges to replace extinct sister taxa.
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