To sum it up, analysis of monitoring data and scientific research from throughout the state outlines the effects of climate change: The spring runoff in the Sierra Nevada has declined over the last century. The period of time when winter temperatures in the Central Valley are cold enough for the development of fruit and nut tree flowers has been decreasing since 1950. River runoff declined during the 20th Century:
in 20th Century
Sacramento River System*
San Joaquin River System
Carson and Walker rivers
*includes the Sacramento River and major tributaries, the Feather, Yuba and American rivers.
Changes in average temperatures have led to die-offs of native vegetation at the lower range of various species’ elevation range (during the last six decades Sierra Nevada conifers have clearly retreated upslope) and is pushing about half of the small mammals in Yosemite National Park to higher elevations. The annual acreage burned by wildfires in the state increased since 1950, with the three largest fire years occurring during the last 10 years. The acidity in the coastal waters around Monterey Bay is increasing at a rate greater than that in the open ocean near Hawaii. The average annual temperature in mountain lakes, including Lake Tahoe, has risen over the last few decades.
And butterflies are emerging earlier during the spring in the Central Valley.
Yet, there’s no real trend that can be discerned from the data. The rise in the sea level rise along the California coast is bucked the global pattern and has be relatively constant during the last two decades.
The good news is that the clarity of Lake Tahoe improved last year. The bad news is the whys. Precipitation in 2012 was only 71% of average and there was a lack of “deep mixing” during the winter.
While the lack of precipitation means pollutants flowing into the lake, the lake will lose shoreline with any prolonged drought.
And, maybe you’d fish those rivers, streams and creeks a bit earlier in the year. Snow in the Tahoe Basin is melting nearly a month earlier than it did in 1960.
The lack of deep mixing – cool surface water sinking and forcing nutrients deeper in the lake to the surface, also know by fishermen as “turnover” – suppresses algae growth, which would otherwise cloud the water — but that also means warmer water temperatures. The annual average surface temperature of Lake Tahoe last year was nearly 53 degrees – the highest ever recorded.
“While Lake Tahoe is unique, the forces and processes that shape it are the same as those acting in all natural ecosystems. As such, Lake Tahoe is an analog for other systems both in the western U.S. and worldwide.”
You can read the relatively short report update here.
The following is a guest post available to all outdoor bloggers who have an interest in the Pebble Mine/Bristol Bay issue. Please feel free to you use it on your blog.
Photo by B.O'Keefe
Starting Monday, April 16, more than 30 sportsmen from around the country are traveling to the nation’s capitol to let their elected officials and the president know that protecting Bristol Bay is a top priority for hunters and anglers.
This is an important week to show the folks who have the power to protect Bristol Bay that sportsmen are in this fight. We’ve got folks from Alaska, Montana, Michigan, Colorado, New Mexico, Pennsylvania, Nevada, Texas, Wisconsin, Washington, North Carolina, California, Missouri, New York, and Virginia representing this great country and the millions of people who want Bristol Bay to be protected and left just like it is today–pristine and productive.
A recent report by the Congressional Sportsmen’s Foundation shows that there are 34 million hunters and anglers in the U.S., and we’re a powerful constituency. Every year, we pump $76 billion into the economy in pursuit of our passion, through our spending on gear, licenses, gas, lodging, meals and more. All of that spending and activity directly supports 1.6 million jobs in this country.
We are also an influential group because 80 percent of sportsmen are likely voters – much higher than the national average. And, we also contribute the most money of any group toward government wildlife conservation programs. So, hopefully if we care about an issue and show our support, the decision makers will listen to what we have to say.
In just a few weeks, the EPA will be releasing a draft of its Bristol Bay Watershed Assessment. This huge scientific assessment will likely guide future decisions about large-scale mining and other industrial development in the Bristol Bay region. If they find that disposal of waste from the mine would adversely harm the surrounding clean waters or natural resources, the EPA can deny or place restrictions on a required dredge and fill permit. If warranted, we hope the Obama Administration would take that step to protect Bristol Bay.
You can support the fight for one of planet Earth’s finest and most productive fishing and hunting destinations by taking action today. Fill out this simple form that will send a letter to the President and your members of Congress asking them to protect Bristol Bay. Let’s carry our sportsmen into D.C. with a lot of momentum.
This week, I might be stepping into quicksand. If nothing else, it’ll be entertaining for the rest of you to watch.
While a good many local anglers applauded the California Fish & Game Commission’s decision at its Feb. 2, 2012 meeting to strike down proposed changes to striped bass regulations, changes that, at the very least, would degrade the quality of a fishery that supports considerable segments of the local economy, there was a curious footnote to the proceedings.
A desire to declare striped bass, introduced from the East Coast, as a ‘native’ California species.
California Fish & Game Commission’s then-Director Daniel W. Richards summed up the issue:
Another great comment that I heard today was this issue of what is native. [California Department of Fish & Game] Director Bonham and I had great conversation just yesterday about this. We are regularly, and just several months we were being challenged with a frogs and turtles matter of non-native species…it’s controversial and there’s both sides to it, and these striped bass have been here for 130 years. At what point in time do we…and some of the analogies we gave I thought were terrific, especially when you take it down to the human level, who’s a native Californian and who’s not. I thought it was really very apropos. I mean, they’ve been here 130 years, that’s, I don’t know, what is that, that’s three or four generations I think you’d probably call that. [Striped bass] starts to be fairly native to me.
After that, then-President Jim Kellogg, after pointing out that he worked on the first pump station on the Delta (1966-’69) and saw the numbers of fish those unscreened pumps dumped into the canal announced in his last act as president:
…because nobody’s got an answer as to how this is done, or who declares it or something like that, I’m going to declare the striped bass a native species in the state of California.
Central to the proponents of the new regulations painted striped bass — asking it be considered an invasive species — as largely responsible for the decline of the state’s salmon stocks. Opponents cited striped bass’ long history in the California Delta (declared a sport fish in 1935) and its coexistence with salmon and Delta smelt over that time. (The definition of ‘coexistence’ may be considered ill-defined in the absence of any hard, long-term, historical data.)
While most will agree that these proposed changes to the striper regulations was a thinly veiled water grab, it does bring to light a conflict that can arise between native and now wild populations of introduced fish, particularly without a firm scientific understanding that can overwhelm any argument from either side of the debate. And while the predation of introduced species changes ecosystems, there’s no scientific model to predict the consequences of eliminating such a long-entrenched species.
In the short span of our lives, does ‘native’ becomes anything that was here before us? Big brown trout and competitive rainbows have so well supplanted Lahontan cutthroat trout — it and the Eagle Lake Rainbow were once the only trout in the Easter Sierra — that rarely does one hear of an angler landing a decent Lahontan, expect those in Crowley Lake and the Upper Owens River. And it’ll be a shame when Lahontan cutthroat no longer exist in California, which is likely to happen.
But it’s hard to label the non-native trout that provide us so much recreation as ‘invasive.’
In any case, might these naturally reproducing fish populations better fit a status similar to that of ‘historical (living) landmark?’ Is there an appropriate measure of time before anyone can declare an introduced species to be a ‘naturalized citizen?’ And will the difference between native and naturalized fish populations eventually become indistinguishable, legally or otherwise?
Regardless of the answers, I’ll be the one overlooking the illegal immigration status of the trout that eats my fly.
If you’re interested, the video recording of the meeting can be found here; click on the link for Feb 2, 2012 and fast forward to about 1:35:00 for the start of the striper discussion.
I received this from a friend, Ted Shapas, who’s the conservation chairperson with the Diablo Valley Fly Fishermen. While the video isn’t all that new, I think Ted’s humorous take on it is.
We’ve all heard of Tenkara fly fishing, in which the reel and most of the line are eliminated. I submit to you a new minimalist fishing method that goes beyond Tenkara – no rod, reel, or line required, just an open boat!
The not so funny part is that these airborne fish are invasive silver carp (escapees from Arkansas fish farms) that have infested many Midwestern rivers, and will likely turn up in California before long.
In an effort to make lemonade from lemons, commercial fishermen in IL and elsewhere are now keying in on these fish for export to Chinese communities in the US and overseas. Silver carp are apparently a delicacy in southeast China, and the Midwest fish, because they are wild, are highly regarded.”