Showing posts with label Black-necked Stilt. Show all posts
Showing posts with label Black-necked Stilt. Show all posts

Monday, March 3, 2014

The Other California: The Wetlands of the San Joaquin Valley, Actually Wet.


It's been a miserable year, one of the worst on record. For the last year much of California, including my home in the Great Valley, has received an amount of rain more appropriate to Death Valley than to one of the most fertile agricultural regions on the planet. It's been dry and dusty, and the farms in the valley have been surviving off of storage in the irrigation reservoirs, but after three dry years in a row, the reservoirs are on empty.
A Black-necked Stilt

In a valley where farming is king and 95% of the landscape is totally devoted to agricultural development, wildlife concerns take a back seat, especially when water runs short. The valley once hosted millions and millions of migratory birds, but during the development of the farmlands, lakes and marshes were drained and plowed, and what few birds persisted got themselves driven off or shot for consuming crops when natural forage was no longer available.
No, it's not drunk, and it's not falling over. A split second later it was airborne.

It would be nice to think that wildlife refuges were established to stabilize and preserve the original environment of the valley, but in some cases the motives were less noble: some, like the Merced National Wildlife Refuge where we visited yesterday, were designed to distract the birds from nearby farmlands where they were causing crop damage. And of course many refuges were designed to make it easier to "hunt" and shoot the birds. Whatever the original motive, their form and function has evolved. As we have come to understand the intricate nature of the migratory bird ecosystem, management of the refuges has begun to promote a stable winter home for numerous species. In some cases they have become spectacularly successful: the Merced Refuge protects 60,000 geese and 20,000 Sandhill Cranes. The refuges are managed as a complex ecosystem, with protection extended to the many other birds, mammals, reptiles, amphibians, fish and invertebrates.
A Black-necked Stilt and a Killdeer forage on the refuge road.

Our previous visits to the refuges (which we pretty much discovered only this year after living around here for a quarter of a century) have been dry times. Some of the fields were flooded but so little water was available. The drought has not broken, but we've finally received some rain, and on Sunday we paid a visit during a rainstorm. The birds seemed pleased, and the noise was almost deafening at times. It was delightful.

The Black-necked Stilts (Himantopus mexicanus) were especially common, and cooperated nicely with our efforts to get pictures, so they are the stars of today's post. "Stilt" is an appropriate enough name; their legs are ridiculously long, allowing them to wade in deeper water than some other birds.

There is only one Ibis in the American West, the White-faced Ibis (Plegadis chihi). We saw it for the first time on our last trip here, and were pleased to see it again. According to some of my guides, the bird is in decline California, primarily because of the need for large marsh areas for breeding. Those have been sorely lacking in these dry years.

They have one of the stranger looking beaks I've seen. They are obviously good for foraging deep in the mud.

Their feathers have a beautiful iridescence (that was not real obvious on this cloudy day).


The edge of the refuge include a few trees, still lacking their leaves. We were watching for raptors, but were thrilled to see a huge Great Horned Owl (Bubo virginianus) staring at us. Actually the stare was mildly disconcerting. The curve of their brows suggests malevolence, even though none presumably exists (I hope; given that birds are the only remaining dinosaurs in the world, I shiver to think of that stare coming from a creature fifteen feet tall).

I saw a fencepost off in the distance, but realized after a moment that it was actually a Great Blue Heron (Ardea herodias) standing very still. Another bird who cooperated nicely as we snapped a few pictures.

It is such an elegant looking bird!

We couldn't get very close to the vast flocks of Ross' Geese, Snow Geese and Sandhill Cranes, but we could see thousands of them off in the distance. The picture below is just part of the main grouping of Sandhill Cranes. The managers grow several hundred acres of corn on the refuge to feed the birds and give them full stomachs for the long flight north to their breeding grounds.

We stayed until the sun disappeared below the horizon in a beautiful sunset. This is the Great Valley at its best; I have been guilty of thinking of my home grounds as boring, bereft of geological interest and lacking much of anything resembling a natural environment that recalls the days following the last ice ages when wooly mammoths and dire wolves roamed the prairies, along with horses, camels, elk, bison, antelope, and saber-tooth cats. But here in the setting sun, with the cacophony of hundreds of thousands of birds, I felt a sense of how it once was before we "improved" the land.

The western sky was graced with a beautiful thin crescent moon.

The "Other California" is my long-neglected blog series on the places in my beautiful state that are often missed  by travelers from outside the region, especially those that tell a geological story. Toyota stole my idea, actually. I've never seen a tour bus full of foreign tourists stop at any of these refuges, but I imagine the sight of tens of thousands of geese soaring into the sky would be a sight that would impress any California visitor. And in the American West, the story of such a flat place, full of wetlands and marshes, is truly unusual, considering the geological violence that has occurred throughout the region, raising vast mountain ranges and high plateaus. The diversity of our landscapes, and the wide diversity of our native species is truly stunning.

Note: The San Joaquin Valley noted in the title is the name given the southern half of the Great Valley, from about Stockton to Bakersfield.

Sunday, January 19, 2014

Birds of My Neighborhood: Geotripper Finds a Moment of Incredible Majesty Amid Environmental Devastation


A White-faced Ibis (Plegadis chihi) at the Merced National Wildlife Refuge
I wonder if you've noticed an additional aspect to my blogging in recent weeks. It wasn't a New Year's resolution because it started well before Christmas, but I realized that I needed to get rid of a few pounds, so I started walking once or twice a day. When a new and more powerful camera landed in my hands, I realized I could get some decent pictures of the numerous birds species I've been encountering during my explorations along the cow pastures and canal levees that are prevalent in my neighborhood.
A Black Phoebe (Sayornis nigricans) at the Merced National Wildlife Refuge

So I've started blogging bird pictures on occasion, such as here, here, and here (click on the words for the link). Is there a geological link in observing birds? I've decided there is, especially in California's Great Valley. The science of the Earth is eclectic, drawing on many different disciplines, including chemistry, physics, astronomy, oceanography, meteorology, and on occasion, biology (think especially of paleontology). Sometimes there is a direct connection, such as when overgrazing or removal of beavers changes the pattern of stream erosion. And land-use issues are one of those areas where geologists can provide an important perspective.
Artificially flooded ancestral wetlands at the Merced National Wildlife Refuge. These are reclaimed farmlands.

One of the most important land-use issues in the Great Valley involves agricultural and urban development and the conflict it causes with the natural habitat that existed prior to the arrival of European settlers. Some 95% of the valley has been plowed over, and all the major (and most of the minor) rivers have been dammed, diverted, or otherwise changed in the service of agriculture. In more recent years, urban growth has paved over prime agricultural acreage, creating a conflict within a conflict. The ramifications of these conflicts extend far beyond the Great Valley. They reach from the northernmost Arctic wastes to the equator, and into South America. The Great Valley, as it turns out, is one of the most critical stops on the migratory flyway for myriads of bird species. Our choices in the valley determine the health of ecosystems thousands of miles away. And most of the wetlands that made the valley such an important flyway stop were drained and plowed decades ago.
Black-necked Stilt (Himantopus mexicanus) at the Merced National Wildlife Refuge

That is why I am kind of thrilled to be writing today about the bird species of my home turf. I have driven by a couple of wildlife refuges for two decades without stopping (what can I say? I live next to the Sierra Nevada and the California Coast; they are a huge distraction). In the last few months, we've been stopping and having a look, and yesterday at the Merced National Wildlife Refuge I saw an incredible thing.
Great Egret (Ardea alba) at the Merced National Wildlife Refuge

The first thing to realize is that the destruction of wetlands has been recognized for many decades, and for years some visionaries have worked to establish protected wetlands. In some cases they have reclaimed former agricultural acreage in a concerted effort to reconstruct some of the original environment that once characterized the valley. There is now a mosaic of wildlife refuges surrounding my community, lined up like islands in a sea of farms and ranches reaching from one end of the valley to the other (a 400 mile stretch). We can never fully recover what was, and will never see the spectacle of millions upon millions of birds descending on the valley floor, but we can see the tens of thousands of the survivors.
Sandhill Cranes (Grus canadensis) at the Merced Refuge

That's what I saw yesterday. I'm admitting my own stupid ignorance here, but I had no idea that we had an American version of the Serengeti Plains a short way from my house. We've probably all seen television documentaries and footage of vast flocks of birds flying and flocking, but I'd never seen such a thing for myself. We headed out to the Merced National Wildlife Refuge because we'd heard they had flooded the wetlands, and that some Sandhill Cranes might be seen. We saw some cranes, but that's not what I found stunning. It was the Ross's (or maybe Snow) Geese.
Ross's Geese (Chen rossii) and Coots at the Merced Refuge

The Ross's Geese spend their summers in the far northern islands of Canada, and spend their winters in California. As we drove the loop road through the refuge, we could see vast flocks off in the distance, and from more than a mile away we could hear their noise. As we drew closer, we could see that there were thousands of them, maybe tens of thousands (some sources mention 60,000 geese). They were chattering and honking, and it was almost deafening. Then the extraordinary thing happened. There was a hush that made us look up, and then a sound like a jet engine began to roar. The ground actually seemed to tremble. Every single one of the ten thousand or so geese was taking flight at once. In less than 20 seconds they were all airborne. I have no idea what set them off, but it was like nothing I've ever seen in my life.
Ross's Geese taking flight

I got a good video of the event, but the compression process during uploading removes the high definition and makes it hard to easily visualize what was happening. I can only say to try and imagine what this piddly movie is showing, and then someday give yourself the opportunity to visit the wildlife refuge during the winter and see it happening for yourself. It's free!

Try something new each day. Your life will be richer for it!