Sunday, April 30, 2023

Thank a Bee


All the busy bees at work collecting pollen and nectar (and pollinating flowers as they go about their business) should drive home the point mentioned in Friday's post:

Not a single bee has ever sent you an invoice. And that is part of the problem, because most of what comes to us from nature is free, because it is not invoiced, because it is not priced, because it is not traded in markets, we tend to ignore it.

- Pavan Sukhdev

The work done by nature that benefits us--known as ecosystem services--is beyond description. Obviously we benefit when bees pollinate the plants we eat. But we don't pay the bees for their work. Rather the opposite: we spread insecticides and destroy quality habitat in our pursuit of highly productive monoculture crops. 

What would it cost us to pay a private company to develop, deploy, and maintain billions of tiny robot-bees to do the same? And would we want to be beholden to companies with a profit motive to ensure our well-being?*


Wetlands are another example of an ecosystem service, and in this case we often find ourselves unwillingly paying nature's invoice. In a functioning ecosystem, wetlands filter water and absorb massive inflows from storm events, which helps prevent flooding. As we've drained wetlands to install (you guessed it) more monoculture crops...as we've paved over prairie, healthy forests, and other habitats with impermeable parking lots and subdivisions...as we've confined rivers to predetermined channels that don't allow them to expand and contract as needed...we find ourselves faced with more frequent and more severe flooding events, which are devastating to communities and costly to clean up. Would the cost of giving back those marginal acres to nature balance out the cost of the floods and related damages?

Combine the difficulty of conveying the complexity of ecosystem services with the similarly complex conundrum of externalized costs and our cultural notion of private property superseding public good and you have a recipe for trouble. We as a community can't charge a landowner for plowing under a prairie or planting row crops right up to the edge of a stream, yet those changes can have a profound negative effect and impose a cost on the rest of us in terms of harming our water health (which requires costly treatment systems to make potable, impacts our ability to safely boat or swim in those waterways, and even has a negative effect on other industries downstream, such as those who make a living fishing in the Gulf losing business due to the Dead Zone caused by nutrient runoff from Iowa and other states).

Similarly we don't impose costs on developers who strip off and sell the rich topsoil from the land before building, leaving hard-packed clay beneath shallow-rooted turfgrass. This, again, can increase runoff and contribute to more flooding events as well as carrying chemicals and other detritus into our waterways. It may be less profitable for these developers to leave that topsoil, or to install raingardens and bioswales to balance the loss of that topsoil...but these current practices strip away those ecosystem services that benefit everyone. Wouldn't it be nice to see even imaginary invoices for those costs, so we can all understand and acknowledge what is being lost and the costs that will need to be borne?

Green infrastructure like the Sycamore Greenway and wetlands can be more costly to install than traditional stormwater management systems. Those rain gardens and bioswales cost more than cheap turfgrass on clay. Leaving buffer strips along waterways and preventing agricultural planting in floodplains certainly are more costly to the producer than planting every possible scrap of an acre. 

But these are only more costly because we disregard the cost of all the services that are provided by these practices. Because we don't value the services when they are performed quietly, freely, by nature. Maybe it's far past time to change that. 


* One estimate puts the cost of ecosystem services at a whopping $44 trillion!


Sources/Additional Reading:

Sunday, April 9, 2023

Spring is in the air....or on the water

 


Oh dragonfly. Won’t you pause and rest for a moment, perch on the tip of a stem to bask and warm your wings in the bright springtime sun? I can’t get a good shot when you zip and zig about. Are you busier in the spring, finding mates and snapping up smaller insects to sate your winter hunger?

But there--you two! You're not moving too fast...and you've alighted on a partially-submerged reed. Shining eyes and sparkling wings above the greenish-brown muck of still pond water.

Fore and aft: blue abdomen locked behind the head of red abdomen, and red abdomen dipped under the surface. So not in the act, but the aftermath: the red-abdomened female laying eggs in plant material near the surface, as her blue-abdomened suitor guards against other males who may attempt to mate with her as well. The endmost segments of his abdomen have specialized pincers to grasp his mate at 

Earlier, when mating, the male would be in the same position but the female would have curled her abdomen so the tip was in contact with the base of the male's abdomen, where she could collect the waiting sperm, an awkward-looking position known as a "mating wheel" common to dragonflies and damselflies. 

The obliging models are Common Green Darners (Anax junius), large dragonflies found throughout most of the country. The species has populations that overwinter in the north, and other populations that migrate to the south as the summer winds down. The dragonflies that don't migrate will overwinter underwater as nymphs (or naiads, as the nymphs of aquatic insects are called), emerging the next spring and shedding their last nymphal exoskeleton to become a winged adult dragonfly.


Sources/Additional Reading: