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Participatory mapping in Africa

An organization called Udongo — which is new to me, although that signifies nothing — reports on a massive mapping exercise in the Mukogodo forest in Kenya. Four different clans of the Yiaku people (some people call them Yaaku) will work with scientists and others to create “a three dimensional model of part of their ancestral lands, showing the Yiaku conception of natural systems of water, forestry, forest products and wildlife. The map helps to create an inventory of indigenous knowledge, natural resources and the intangible heritage of the region.” Then what? “The Yiakku will explore how the 3 D model will be integrated into the future planning processes of the Yiakku and Mukogodo community.”

If you’re listening, Udongo, let us know how it works out, OK?

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Parasites push promiscuity

Many hermaphrodite plants (and some animals) — including many crops — have what is called a mixed mating reproductive strategy. That means they reproduce by both self- and cross-fertilization, with important consequences for the amount and structure of their genetic variation. The prevalence of mixed mating systems is surprising because inbreeding depression should work to get rid of self-fertilization, resulting in “pure strategies of either outcrossing or selfing.” Now a new study suggests that its natural enemies — pests, parasites, herbivores, etc. — may have a strong effect on the evolution of a plant’s mating systems:

For example, enemies may alter the availability of mates in a population, which may have direct consequences for victim mating system evolution. Enemies may also influence the expression of traits that are important for mating system evolution, thereby improving the evolutionary stability of mixed mating as a reproductive system.

Thus the dynamics of the interactions between a species and the biodiversity that surrounds it can counter the effects of inbreeding depression and lead to the stability of an otherwise doomed evolutionary strategy. I wonder how important this has been in the evolution of agrobiodiversity. After all, concentrating plants in dense near-monocultures like agriculture does is a boon to natural enemies.

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News from the front: Belize

As far as I know, it has more species of trees, shrubs, bushes, herbs, and grasses than any domestic garden on Earth: 318 species of flowering plants, 250 of which are native to Belize. That’s about 15 percent of the indigenous floristic diversity of the whole country, more species of native plants than live in the forest that surrounds it. Every plant is here for a purpose, used as medicine, food, thatch, fiber, because it attracts butterflies, birds, and mammals, or just because of its beauty.

The garden is Masewal, in western Belize, and the words are from an article in Orion magazine that describes this astonishing place. The vision of one man, who sought to reclaim some of his Mayan heritage and has been doing so for 31 years, using the garden as store-house, teaching aid and demonstration plot. Fascinating.

Belize was my first experience of a tropical forest and I remember the giddiness of it. I wrote something about it back then; I wonder whether I can dig it out.

via Metafilter.