Of course one should take note of the now outdated "original range map of beaver" as interpreted by Grinnel. New date has come to light showing that the historical range of beaver in California is best reflected by the map below per the work of Lanman et. al. 2013.
Now for this post I want to focus on a little heralded population of southern beavers represented by the stippled red dots on the river second from the bottom on the coast of California. That little river, better described as a creek in all actuality, is the Santa Margarita River. It's only about 30 miles long and like all rivers in socal is best described as intermittent. Formed by the confluence of Temecula and Murrieta Creeks, there are several well known beaver dams at the confluence. Now I have actually never visted this river but with the magic of google maps one can easily enough find the dams, from outer space!!
Hopefully you can see where I have measured this pond at about 47 meters (152 feet). Pretty nice litle beaver pond. Now I only recently started spending significant time tracing river/stream courses looking for beaver ponds and it is very fun I must admit. In fact I would suggest doing so is the best teaching tool for looking from a landscape perspective at where, how, and to what extent beaver do their work. I highly suggest it!!
Look at this big pond above over 140 meters (462 feet long) !! This might actually be an old dam, you can see it is not too well maintained. Or it might be a naturally occurring pool but the vegetated downstream section makes me thing mud was piled up there at one point.
Above is another example of a beaver pond at over 264 meters (868 feet long) in a broad, alluvial valley. Remember, having that alluvium, i.e. mud, to play around with allows the emergent vegetation and the riparian layer to develop that beaver need. This is why bedrock bottomed creeks/slot canyons are not so great for beaver dams. Hard for the vegetation to get a toehold.
Look at the dams above. You can see that vegetation is filling in the ponds. Chances are if beaver were not along this stretch of the river it would be completely dry. But beaver activity, I suspect deepening of the pools by beaver allows year round refugia. And this is a common theme looking at beaver activity along southern California streams/rivers. Long stretches of no water, followed by a gradual increase of vegetation and some surface flows and then you start to see hints of beaver activity and them voila active beaver ponds. Did the beaver seek out the springs of water or did they over time create them? You get into a little bit of a chicken vs egg conundrum. I am reminded of the Chumash oral tradition
Now that is a very powerful and eloquent parable for the beaver in southern California. In fact that story is more potent and powerful than just about anything I have came up with on this blog!!
While the presence of beaver ponds to slow the water flow (thereby locally
reducing the gradient) could be interpreted as favorable to stickleback, this would only be
the case if the exotics were absent. In addition, the beaver dams cause increased water
temperatures that would be detrimental to the stickleback. Threespine stickleback have
thermal requirements higher that rainbow trout but lower than arroyo chub (Swift 1989)
and would do better in the cooler flowing waters of the natural stream. Stickleback were
undoubtedly numerous in the large slowly flowing, algae filled pools in the gorge before
the advent of exotic species. In any case the necessity to limit or exclude beaver ponds as
favoring exotic predatory exotic species overrides any consideration of possibly
increasing habitat for stickleback that do now currently inhabit the drainage.
Of the four originally native species to the river steelhead, pacific lamprey, arroyo chub, and threespine stickleback only arroyo chub was found in their survey. Interestingly striped mullet, an estuarine fish, went pretty far upriver. And as you can see from the list of exotics, it is a system dominated by them. How are we to say with or without beaver that the natives would not be in trouble? I mean this is the situation on the Santa Clara River where there are no beaver but plenty of non-natives.
Nope I consider blaming beaver for the spread of invasives a bit of a logical fallacy - if you want to blame something blame humans - we put them there.
A big dilemma with non-natives and something that I think should be iterated is that many of the species in question are from the east coast of America. So beaver dams are not anything new to the ecology of these species. Furthermore if you are a green sunfish or a largemouth bass you do not really care if you are in a beaver pond, an irrigation ditch, or an oxbow - you found a good home. And secondly these east coast fish evolved in more competitive, diverse assemblages of fish than western species. So when push comes to shove they are just a bit more pugnacious, aggressive, and voracious than native fish. Holds true for bullfrogs and Louisiana swamp crawfish.
|Fishing for Beaver Pond Bass - it's a thing|
In fact in the case of bass there is a little bit of fisherman's cult emerging concerning bass and beaver ponds. Turns out, surprise surprise, the prized game fish just loves to hole up in beaver ponds and especially likes all the woody debris in the dam to hide out in during the day.
The way I see it the issue of invasives in California/arid watersheds is as such:
1) Do nothing. Admit they are too widespread and numerous to control. The new fish fauna is an alien fish fauna and this is the new normal. This is what seems to be happening anyways and is pretty much the default solution based on what I have seen. All those man made dams and reservoirs are stocked with non-native species for fishing purposes. Whenever there is a flood or water release the downstream river from the reservoir is inoculated with non-natives.
2) Do everything. Massive campaigns of eradication including hand capture, fishing, electroshock netting to eradicate non-natives. Several complete sweeps of entire watersheds necessary. Stringent laws enacted to penalize intentional release of non-natives. Somehow eradicate founding populations of non-natives from lakes and reservoirs. Likelihood virtually nil considering the scope, magnitude and prices involved. Would require a seismic shift in societal attitude.
3) Mitigation. Find ways for natives and non-natives to coexist. Electroshock areas and clean out non-natives but leave natives. Encourage restoration of native predatory birds, mammals, and reptiles to hold non-natives in check. Probably the best and most practical option for maintaining native populations.
As I have discussed before beaver ponds can be utilized as a tool for trapping out non-natives. If we know such and such non-native species is utilizing beaver ponds preferentially that species can be targeted at beaver ponds. Hand capture, netting, electroshock can be utilized to clean out the unwanted but leave in the wanted. Encourage the return of native predators to hold aliens species at check. Beaver ponds are easily found via google maps and can thus be cleaned occasionally of non-natives.