Western and Clark’s Grebes Have a Disappointing Season in Northern California

by Larry Jordan on October 18, 2011

Western Grebes (Aechmophorus occidentalis) Courtship photo by Larry Jordan

We are fortunate in Northern California to have four lakes that support 76% of the total number of nesting grebes in California1.  A few weeks ago I visited Clear Lake, one of the four aforementioned lakes which also include Eagle Lake, Lake Almanor and the Thermalito Afterbay of Lake Oroville, to give a presentation on the Burrowing Owl to the Redbud Audubon Society.

Eagle Lake, Lake Almanor and Clear Lake have all been identified as Audubon California Important Bird Areas (IBA), meaning that they provide essential habitat for breeding, wintering, and migrating birds.

Redbud Audubon is conducting a four year Grebe Conservation Project that is being monitored by Dr. Floyd Hayes, Professor of Biology at Pacific Union College.  To my good fortune, Marilyn Waits, president of Redbud Audubon, arranged for me to meet Floyd and accompany him and three other bird enthusiasts on a day long waterfowl count on Clear Lake.

As a guest on the boat, I was able to relax and enjoy the day as the others were busy counting birds.  One of the highlights of our day was the sighting of a juvenile Parasitic Jaeger.  But even better than that was the chance for me to get to know Floyd and learn about the grebes breeding on the lake.

Western Grebes (Aechmophorus occidentalis) and Clark’s Grebes (Aechmophorus clarkii) are probably best known for their elaborate courtship displays.  These ceremonies are some of the most complex displays in the world of birds.

Breeding success on Clear Lake has been highly variable noted by U.C. Davis’s researchers over the past ten years logging a high of 2,675 nests in 2000 to a low of 20 nests in 2007.  The 2011 grebe nesting season, which appeared to be off to a good start ended in disappointment.

Just a few weeks before my visit to Clear Lake, Floyd and his students had tallied 1,248 grebe nests, but on the day we did the waterfowl count we only saw about a dozen grebe chicks.  What happened?  (All remaining photos taken by Floyd Hayes during the 2010 nesting season)

Western Grebes Mating on Nest photo by Floyd Hayes

Clark’s and Western Grebes nest in colonies of several pairs to hundreds per site.  Unfortunately, in all the colonies on the lake this year, grebes that had been sitting on nests incubating eggs abandoned their nests.

Western Grebe on Nest Incubating Eggs photo by Floyd Hayes

The most likely explanation is a lack of sufficient food supply for the chicks.  Grebes eat fish.  This year at Clear Lake the silverside minnows and other baitfish spawned very late.  Wildlife biologists at the lake stated that there have been numerous studies done on why wild birds abandon their eggs and nests, and most of the time the studies point to a lack of food to feed the young.

Western Grebe Hatching photo by Floyd Hayes

The parent birds, realizing that there won’t be enough food for the chicks once they hatch, abandon the nests, avoiding the wasted energy and devastation of hundreds or thousands of starving baby birds.

But when they are successful the young climb onto their parent’s back within minutes of hatching.  They back-brood on the nest while the eggs are in the nest…

Western Grebe with Brooding Chick and Egg on Nest photo by Floyd Hayes

and on the water until they are 2 to 4 weeks of age.

Western Grebe Chicks Being Carried on Parent’s Back photo by Floyd Hayes

I did get to see some chicks dutifully following their parents and being carried on the parent’s backs, but very few.

Western Grebe Chick Riding on Parent’s Back photo by Floyd Hayes

Audubon California is employing a variety of strategies to reduce the impact of human interference on breeding grebes.  With the help of three local chapters, Plumas, Altacal and Redbud Audubon, the project involves identifying the key threats to the grebes at each site, outreach and education to local communities, working with agency officials to optimize conditions for the birds, and extensive monitoring1.

“No Wake” buoys are placed around nesting sites and these signs were designed and placed at boat ramps to educate local boaters and fishermen.

Some folks don’t seem to realize how critical it is to minimize their boat wake which can swamp and destroy a nest.  Here is a photo Floyd took of an unconcerned boater plowing right through the middle of a nesting grebe colony at Clear Lake last September.

This kind of behavior can kill birds outright if struck but will most certainly cause swamped nests like this one with corresponding deterioration of breeding success.

Western Grebe Nest Swamped by Boat Wake photo by Floyd Hayes

Hopefully, as people become more educated and concerned about the wildlife around them, unwarranted acts of destruction like this one will diminish and wildlife will get the respect it deserves.

I leave you with a couple more photos Floyd captured at Clear Lake last year.  This portrait of a Clark’s Grebe, a species on the Audubon Watch List, showing that bright orange bill.

And (step back) a Western Grebe defending its nest!

For more great bird photos, go check out World Bird Wednesday!

References: 1Audubon California

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{ 14 comments… read them below or add one }

Boom & Gary October 18, 2011 at 10:34 am

Great post Larry!! I really have given up hope for educating your citizens on conservation. The worship of the gasoline engine at exactly the time oil supplies are limited, and further declining, and most contaminating is comparable to the cigarette smoking war. After all Philip Morris still exists under another name. Smoking was never halted, because of a lack of believe and moral fibre. The same applies to the use of energy, and conservation. Apart from a few like yourself, the rest are too high risk to the world. Boom & Gary of the Vermilon River, Canada.

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Andrew October 18, 2011 at 11:13 am

Beautiful birds to see Larry….
So many selfish people doing their own thing all over the planet…

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Mick October 18, 2011 at 12:24 pm

Very interesting post about the Grebes. It’s not possible to regulate their food supply but we certainly should be able to regulate people in boats!

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dreamfalcon October 18, 2011 at 12:30 pm

It’s really important to keep on education the people!
Last spring I saw two Great Crested Grebes standing on their legs for courtship. They don’t any of the running stuff but I was still amazed.
That last photo of yours is great 🙂

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margotschulzke March 8, 2016 at 5:09 pm

Thank you. Lovely.

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Mia McPherson October 18, 2011 at 12:55 pm

Larry,

Thanks for this very informative post about the grebes. It is my sincere hope that those of us who have deep passionate feeling for and about birds can educate more people about them, including looking out for all the birds welfare. It doesn’t hurt to try.

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Eileen October 18, 2011 at 1:48 pm

Wow, awesome shots Larry! I love your Grebes and the babies are adorable. how cute! What a wonderful sight to see. I would have been so mad at those boaters, some people are just ignorant.

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Martha Z October 18, 2011 at 2:49 pm

A great post, Larry. I’m sorry to hear that they didn’t have a successful season at Clear lake. I wonder why the fish populations is down.

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Dawn Fine October 18, 2011 at 5:39 pm

Great Post Larry~Wish there was some way to get those boaters away from the area…not good!
That last photo has me cracking up..hee hee

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fjällripan October 19, 2011 at 2:14 am

Wonderful post. So great to see, especially the baby grebers!

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joo October 19, 2011 at 4:02 am

Lovely photos and very interesting post!

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springman October 19, 2011 at 6:07 am

A sobering post Larry! Cheers to all those who work so hard to help these magnificent grebes continue to grace our lakes and skies. Can people be taught to respect nature? I sure hope so. Thanks to you for your efforts. Thanks also to Floyd for sharing his great pictures. I am glad I live in an nature preserve that prohibits motorized vehicles. There’s a lot of people out there that like to go fast regardless of the consequences. They need to be fined because even a thick headed person will understand that!
The problem is enforcement, and apparently government can’t or won’t afford that.

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Pat October 19, 2011 at 6:33 am

Wonderful informative post, Larry! The Grebes are marvelous birds. I love the beautiful video you included along with your great captures. Hoping the next breeding season is more successful.

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Jean October 20, 2011 at 6:31 pm

Larry, Thanks for introducing me to Grebes. I was smitten by the video,photos, and info. I was heartbroken by the challenges they face.

BTW…That last photo is a riot!:-)

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