30.11.14

Phylogenetic Avian tree

I was reading Nick Minor's science of birds blog - and came across the following infographic, which is pretty cool, but the chronology is hard to infer without your mind melting a little:


But then it seems some of the folks at Imperial College have also built an beautifully organic moving visualisation of the same data set right here. I could play with this for hours.

http://www.onezoom.org/birds.htm





26.11.14

South Central LA


 Just as the first polar front clawed its way across the north east and drove every New Yorker into a frenzy of online shopping for the warmest down coat, I stepped out at LAX into the endless sun.

Just flying over the Los Angeles region – the endless grids, malls, freeways veining the sprawling limbs of Long Beach, Santa Monica, Anaheim and Irvine, you’d think there were no redoubts for nature here.

Wrong.

Driving between client meetings I stopped at El Dorado park, a patchwork of microhabitats from coastal live oakwood to chaparral, sandwiched between the ganglands of Compton and Long Beach airport. Wilsons’ and Orange-crowned warblers had stalled their migrations in the riverine forest and out on some wasteland Allen’s hummers buzzed each other with territorial dive bombs more akin to breeding behavior.


Just outside the reserve, as the woods gave way to manicured parkland, a small group of 6 kingbirds came in. I left mounted the kerb, left the engine running and ripped the scope from the backseat. Cassin’s kingbirds confirmed by their surly disyllabic vocalisations.  Lifer #2 on my flying visit to LA.


12.11.14

eBirding


I’ve been using the summer to put some of my old records into eBird. Partly because I’ve no idea how many birds I’ve actually seen, and am curious to know, and partly because I just think the whole concept of eBird and citizen science is awesome.



What I’ve realized though, is I kept really shitty notes on most of my trips, and none at all on others. I know when I came back from Morocco I had a list of over 100 birds including some pretty interesting Atlas mountain species. 10 years later I have a couple of scribbles in my fieldguide and no real idea what I saw,  apart from a vague memory of Moussier's Redstart because it had such a cool name.

Other trips my field guides seem to have scribbled dates, but no locations. In hindsight, I guess it's much more important to know where you saw something than when you saw it! I did manage to find a really old passport and use the stamps to at least work out what year I’d been to certain places.
Anyway, I’m just over 1700 birds into inputting data, and still going. I’ve yet to finish my Argentina list, which will be the hardest as I lived there, guided and birded for a few years.
I don't know why I thought I couldn't write stuff down while I was guiding...
This marginalia is about as good as my notes get:





4.11.14

Georgia in Fall

I was down in Atlanta the last few days for work. The migrants I'd seen passing through New York a few weeks are go are still moving through the north Georgia mountains. I headed out early along the Chattahoochee, one of my favorite rivers.

The riparian forest in these bottomlands is, in places, genuine old growth, and today it was alive with woodpeckers - that most sedentary of families - as well as migrants.

In fact, I had a six woodpecker morning, with what looked like a mated pair of pileated, a lone red-headed, and countless downies, sapsuckers, red-bellieds and flickers.

One big oak showed how foraging strategies differ to avoid niche competition, with the downies all at the outer reaches of the tree, the sapsuckers focussing slowly and methodically on the forks of the main trunks, and the red-bellieds more flighty and opportunistic. 


                                       


This got me wondering why there is high woodpecker diversity here. And about radiation within the woodpeckers generally. 

If woodpeckers are sedentary, and don't show much behavioral plasticity, why are they so successful in these kinds of forest? How can they sustain such diversity? Is woodpecking a really great niche? 

Maybe. It's a niche that's also been exploited by other birds that lack competition from woodpeckers, especially on islands, which woodpeckers haven't been great at colonising; vangas in Madagascar, crows in New Caledonia. 

Or maybe woodpecking is really lots of niches? So the lack of plasticity in behavior is part of the reason they've been able to radiate into sets of close-living specialists. 

Whatever, they're one of my favorite families, so seeing a bunch every time I walk through these forests is always great. 

On the way home, browsing amazon for woodpecker books, I saw the snow had already hit the ridges of the southern reaches of the Appalachians a few hundred miles north over the Tennessee border.

                                   

About Me

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NYC, Buxton, Buenos Aires
I work in NYC and own a wildlife and wilderness agency specializing in the southern cone of South America. I still do some guiding down there, especially looking for Fuegian and Patagonian avifauna. I'm particularly interested in the wintering ecology of neotropical migrants, and in avian biogeography in general. You can follow me at - @domhall And find me at - AventuraArgentina.com