Category: Pollinators

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So what’s with them bees?

Overall, we must conclude that claims of a global crisis in agricultural pollination are untrue.

That’s from a New Scientist digest of a Current Biology paper by the authors themselves. 1 Roughly, the argument is that (1) bees are responsible for the production of a lot of our food, yes, but not that much; (2) pollinators are declining, yes, but not worldwide, and probably not irreversibly; and (3) pollinator decline can threaten agricultural yield, yes, but it hasn’t actually done so yet. The data come from a huge FAO dataset of “yield, and total production and cultivated area of pollinator-dependent and nondependent crops.”

But not so fast. The relatively small proportion of agricultural production that depends on pollinators has quadrupled during the past 50 years. So if there’s no pollinator crisis now, there may well soon be one.

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Bee story with a sting in its tail

We’ve been a bit forgetful lately, not submitting items to Scientia Pro Publica, one of the most popular science blog carnivals around. But that doesn’t mean we’ve ignored the latest edition, at Genetic Inference. There’s a bunch of stuff there on climate change, and a link to a long post on David Roubik’s 17-year quest to understand the impact of African Killer Bees.

We nibbled Science Daily’s take on the original scientific paper, but on an amazingly busy day. So it is good to see Greg Laden take a somewhat longer view. To the press release, which he thoughtfully copies, Laden adds the observation that “the so called “African Killer Bees” are nothing other than the wild version of the honey bee,” and points out that people have a hard time relating loving, gentle European honey bees to these killers out of Africa’s dark heart. The interbreeding of wild and domesticated honeybees restored some aggression to domestic stocks and in the process of “Africanizing” them also boosted their honey-gathering abilities.

Roubik’s study concluded that although there have been swings in populations of various bee species, pollination has not suffered. Local bees, sometimes outcompeted by Africanized honeybees, are finding other flowers to sustain them. Most of the local plants are still doing fine, and some that are favoured by local bee species have even spread. But Roubik also sounded a cautionary note that hinges on the insurance value of plant biodiversity.

Basically we’re seeing ‘scramble competition’ as bees replace a lost source of pollen with pollen from a related plant species that has a similar flowering peak–in less-biodiverse, unprotected areas, bees would not have the same range of options to turn to.

That’s crucial. Roubik studied bees in “Sian Ka’an Biosphere Reserve — a vast area of mature tropical rainforest in Quintana Roo state on the Mexican Yucatan”. With fewer flower species among which to choose, local bees might not do so well. On the other hand, if the flower species aren’t there, they won’t suffer from the loss of local bees.

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Nibbles: Markets, Easter Island, Honey, Coffee, Cowpea, Morocco, Urban Ag, Kenya