Recently, over at 10000 Birds, Charlie touched on the controversial subject of killing introduced and invasive species. This is a conservation strategy that raises ethical concerns on the individual and population level, and often involves unexpected wrinkles, as when the invaders turns out to be threatened themselves. On the other hand, it has also saved some species that might otherwise have been lost forever.
Another problem is that “invasive” and “introduced”, though highly overlapping concepts, are not perfectly congruent. While “people did it” vs. “it’s natural” is, at heart, a false dichotomy, removing animals that were directly placed in a new region by human activity – released pets, stowaway snakes, etc. – tends to be viewed in the lens of correcting an error or setting right what once went wrong. “Natural” range expansions carried out by animals mainly under their own steam, however, are often welcomed or celebrated – even when humans have significantly contributed with assists in the form of new habitat, food sources, etc. (See Northern Cardinal and Cattle Egret). It’s an emotional reaction, but not necessarily a wrong one – after all, expanding to take advantage of a changed environment is a time-honored evolutionary tactic, and if there’s one thing that can’t be denied, it’s that humans are changing the environment. Attempting to set in stone a certain range as forever correct for a species would be equally artificial.
Now these perceptions of good and evil, natural and unnatural, are colliding in the ugly case of Barred Owl vs. Spotted Owl. Formerly, these two closely related species were separated by the treeless zone in the midst of the continent (a zone which some scholars argue was in part created, or perpetuated, by Native Americans using fire as a tool to maintain bison habitat) and therefore had but few occasions to come into conflict. Now the Barred Owls have used forests encouraged by fire suppression as a bridge to move west. Both species are dependent on fairly large chunks of forest to maintain their livelihoods, with one small but key difference; Spotted Owls are more attuned, especially in the northern parts of their range, to old-growth forest in particular, whereas the Barred Owl is able to get along with fairly young trees. The Barred Owl is also prone to be more aggressive, killing Spotted Owls when they compete for territory (as well as occasionally hybridizing with them.)
In light of all this, federal biologists are considering an action that has unfortunate echoes of the old-school: controlling (that is, killing) Barred Owls in areas where they come into conflict with the Spotted.
The Spotted Owl is rare and precious; the Barred Owl is common and disposable. Or, the Barred Owl is vigorous and successful; the Spotted Owl is feeble and too picky for the new environment in which it finds itself, so an evolutionary failure. Neither set of value judgments tells the truth about either species, or gives us a simple right answer on what to think about these measures.
I don’t know what is right, but I do know what is wrong – the constraints within which the Fish and Wildlife Service has been driven to consider this desperate measure. Because there’s another party to the Spotted Owl’s destruction – one that we all know very well: habitat destruction.
Controlling barred owls was a central strategy of the Bush administration’s overhaul of the spotted owl recovery plan to make way for more logging.
The insane, unsustainable management strategies of the timber industry have held the Spotted Owls hostage for a long time, and now they are using the Barred Owl as a scapegoat in a vague parallel to the way they once used their own underpaid and exploited employees in the same role: someone’s going to get the shaft, but you can bet it won’t be timber company executives. “Let’s you and him fight” is their favorite game.
So this I know: if the choice is between less logging in the old-growth forests and killing damn near any species at all, it’s definitely the timber industry’s turn to take the hit. And the timber industry’s role to make good the loss to their employees that’s bound to occur, not because tree-huggers are so darn unreasonable, but because they themselves have chosen to enact a tragedy of the commons and force a situation of sudden decline rather than opt for slower growth and a sustainable business model. After all, these same people would be abruptly out of work should all the big, old trees go for pulp rather than into a preserve.
It’s not everyone else’s job to keep them in business by giving up our natural heritage, our public lands, and in the case of the Barred Owls, our life’s blood.
(Photo courtesy of D. Gordon E. Robertson under CC Attribution-Sharealike 3.0)
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December 11, 2009 at 6:04 pm
Shareholders dictate that everything is a growth industry, including things that clearly can’t sustain rapid growth. It’s the height of idiocy.
Phenomenal post.
December 11, 2009 at 9:18 pm
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December 11, 2009 at 11:11 pm
My hubby and I are both supporters of old growth forest. As far as the owls go I would love to see both species thrive. It would especially be a shame to lose the Spotted Owl.
December 12, 2009 at 4:03 am
I’m not against control of one species to preserve another if it’s really necessary, but it’s not clear to me that Barred Owls are the real problem. From what I have read, the continuing habitat loss is the main cause of the Spotted Owl’s decline. Plus the fact that this approach was favored by the Bush administration makes it more suspicious.
December 12, 2009 at 6:48 am
Several journal articles (see links below) are relevant and suggest that Barred Owl expansion is likely to be detrimental to Spotted Owl populations regardless of any changes in logging practices. It’s worth keeping in mind that old growth forest takes hundreds of years to develop so the logged forests are not coming back anytime soon. This means that any Spotted Owl territories lost to Barred Owls are gone – there is nowhere else for them to go (assuming most suitable Spotted Owl habitat is occupied). The second article suggests that it is not completely known why Barred Owls have expanded into the west but it is coincident with settlement of the west and anthropogenic change.
http://tinyurl.com/ya2lq24
http://tinyurl.com/yb8zqdl
More articles can be found by searching Google Scholar:
http://tinyurl.com/yatc7mh
December 12, 2009 at 6:55 am
Indeed; and as above, whether or not killing Barred Owls is the right move to save Spotted Owls is something I’m not prepared to pronounce on from the comfort of my futon. If it is… well, that’s a hard case.
It’s only Barred Owl control specifically in conjunction with or as a pretext for the expansion of logging that I’m firmly against. Since, as you said, we’re not getting the forests back tomorrow, we’d best keep what we have regardless of what we do with the Barred Owls.
December 12, 2009 at 7:20 pm
I haven’t got the time to read the articles (very unfortunately), but what you summarize seems to be bad, bad news.
The fact that Barred Owls have expanded towards the West “for good” and are competing aggressively with Spotties might mean that the Spotted Owl will one day – not so far away? – be entirely dependent on human management, meaning Barred Owl control. Because now that the Barred Owls are there and outcompete the Spotties, even the loveliest re-old-grown forest won’t save the Spotted: Barreds will move in there, too.
Might the Spotted Owl soon be dependent on Cowbird, wait, make that Barred Owl control like the Kirtland’s Warbler?
Let’s hope not, but it sure looks like it.
December 12, 2009 at 4:51 pm
“Controlling barred owls was a central strategy of the Bush administration’s overhaul of the spotted owl recovery plan to make way for more logging.”
The reason Bush shifted the focus to barred owls? So he could cut Endangered Species Act-required critical habitat for the spotted owl by 1.6 million acres. The problem with the ESA’s Section 4 critical habitat designation process is that it explicitly allows the economic impacts (ie logging) of designation to be considered. Restoring the owl’s critical habitat and/or changing the ESA’s critical habitat designation considerations may be more effective than killing barred owls…
December 12, 2009 at 9:15 pm
I’m with you, Carrie. I wrote about this issue when the barred-owl control ball first started rolling in 2005 (http://10000birds.com/barred-owl-bombardment.htm) and am sorry to see that the policy is still so misguided.
December 13, 2009 at 1:05 am
For what it’s worth, the population in question is the Northern subspecies of the Spotted Owl and to a lesser extent the California subspecies. There’s a third, significantly better of subspecies in the Southwest US and northern Mexico with a much larger historic range and a slightly less restrictive habitat requirements. It’s not on easy street by any means, but the prognosis is somewhat more positive.
I have a hard time seeing a future that doesn’t involve the Spotted Owl in deep trouble, but from a triage perspective there’s reason to hope for the species in general, if not the northern subspecies.
December 13, 2009 at 1:21 pm
@Nate: unless that northern subspecies is so different that it merits species status. That’s the political side of taxonomy, its “ugly head” so to speak: nature conservation, at least the juristicial one, is largely based on species and not distinct geographic forms or ecological entities. Yet I daresay that the loss of the northern Spotted Owls would always be tragic, regardless of the existence of very, very close forms somewhere else in a completely different ecological context.
Having said that, I would like to stress though that this argument of mine is nothing but an overyl optimistic wishful thinking and that the realistic part of me absolutely agrees with you and completely gets/supports your point:
any extinction is tragic, but for ourselves, as human beings who enjoy watching birds (or more general nature and biodiversity) the loss of e.g. one species of Acrocephalus Warbler would be less painful than the complete loss of the Tiger; or – seeing as this is a North American blog – losing the Great Gray Owl would leave behind a larger gap than losing one of the Empidonax flys.
Those are the times we live in.
Dang.
December 13, 2009 at 5:18 pm
I agree, just trying to make lemonade from lemons, so to speak. The northern Spotted Owl is such an iconic bird of that specific wonderful habitat. The loss of it would hurt all the more because the old growth temperate rainforests are in so much trouble.
Hey, but we need our super-soft toilet paper right?
December 13, 2009 at 6:27 pm
The ESA defines ‘species’ to include ‘any subspecies … and any distinct population segment of any species.’ Say what you will about the weaknesses of the ESA, but it’s thanks to this broad definition that we’re worrying about these particular spotted owls at all.