Archive | February 2013

Cheapskate Tuesday 4: 50 mm 1.8

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If you need a useful fast lens for a DSLR, why not consider the inexpensive 50 mm 1.8? Canon makes one, Nikon makes one, everyone makes one. They are cheap, they are fast and they are sharp. They are super versatile used as is, and can be excellent for closeups when used with extension tubes (I will cover this in an upcoming post). Normal on full frame and moderate telephoto on an APS-C, they are worth having around.

If you have 100 bucks and no fast prime, go get one (you too, Mike!).

See gallery below for some examples of what it can do.

Weekend Expedition: SFU

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SFU, supposedly an “architectural jewel“designed by Artur Erickson looks like a hideous Stalinist prison*, and in many ways it is. But being situated on a forested mountain means that the non-building areas are quite nice, and a great escape if you need to immerse yourself in nature.

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The forests are all second growth, although a few old cedars were not chopped down. Most of the mountain is parkland.

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The view down the sides of the mountain allow glimpses of Burrard Inlet, which is not as much of a toxic waste dump as you may have thought (although I would not eat the shellfish)

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Out behind the Biology Buildings there are some nice wooded paths, where even on a cool February day you can find a firefly or two.

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Seems like many insects were out soaking up the sun.

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Spring is waiting to be sprung…Hang on spring, you will be called for in June.

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This cranefly is a good example of a winter-active creature you can find out flying on a sunny day.

The weevil sunning on a railing rounds out the expedition.

 

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And one more to show that blue skies can exist in Vancouver.

*I know, I know, I probably don’t “get” architecture. But I don’t “get” classical music either, but it still sounds nice to me. These buildings however, look like about the worst kind of ugly I can imagine.

Red-throated Caracara research: natural history and classification from 1765 to 1838

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This is the illustration of the Petit Aigle d’Amerique from “Planches enluminées d’histoire naturelle” 1765

I mentioned last week in my introduction to the Red-throated Caracara  that there is very little known about the species. While details of the life history of these birds are still hazy, the existence of the bird has in fact been known to scientists for quite a long time. To know a species, we must first be able to recognize it as distinct and to give it a name. There is a formal protocol for this, that has been developed and refined through time, and it so happens that the Red-throated Caracara has a long history in zoological classification.  I normally find the  subject of early nomenclature work to be a bit dry, but I am pleased to report that work with the Red-throated Caracara has been a surprisingly pleasing visual endeavour from the outset.

The first published description that I can find on these caracaras belongs to Buffon, Georges-Louis Leclerc, Comte de Buffon to be exact, one of the pioneering Enlightenment era naturalists. Buffon’s 1765 description consisted of an engraving and a name, “Aigle d’Amerique” in the “Planches enluminées d’histoire naturelle“, a 24 volume set of coloured engravings done mainly by F.N. Martinet, a talented engraver. This work was commissioned by Buffon and supervised by Daubenton, so authorship is a bit muddled, but on the whole,  the work is mainly attributed to Buffon. He recognized this species as an eagle, rather than a falcon, as he considered the shape of the bill, down turned at the end, to be more eagle-like.

Drawing inspiration directly from Buffon/Martinet/Daubenton’s work, the first written description seems to be that of an Englishman, one John Latham, who described the bird quite well and called it “the Red-throated Falcon” on page 97 of his 1781 book “A general synopsis of birds“. It is unclear why Latham placed this species with the falcons, although he was quite correct to do so.

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Here is Latham’s original description, which gives the name Red-Throated Falcon, and notes the occurrence of the species in Cayenne and other parts of South America

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I think it is a moft beautiful fpecies too!

While this is a step along the path, it was not yet the official scientific name of the Red-throated Caracara…Latham’s description may have been useful, but it is not considered the first official species description. That honour goes to Pieter Boddaert, who, in 1783 gave this species its first Latin binomial: Falco americanus in “Table des planches enluminéez d’histoire naturelle de M. D’Aubenton: avec les denominations de M.M. de Buffon, Brisson, Edwards, Linnaeus et Latham, precedé d’une notice des principaux ouvrages zoologiques enluminés“. As the species name “americanus” now has precedence, it has remained attached to the Red-throated Caracara to this day.

In 1786 Gmelin (who was an associate of Carolus Linnaeus) named it Falco aquilinus, but this is considered a junior synonym, as it was published after Boddaert’s F. americanus.

In 1816 L.P. Vieillot moved this species to “Ibycter” in “Analyse d’une nouvelle ornithologie élémentaire“. This was the first written communication that applied the genus name “Ibycter” to the Red-throated Caracara, which has more or less stuck, and also a new common name “Rancanca” which has not. I am very intrigued by the origin of the name Ibycter…I have not found what it refers to, whether to mythology or if it is just an obscure word…Anyone out there have some insight?

The first real natural history information on the Red-throated Caracara comes from 1834, with the publication of “La Galerie des Oiseaux“, also by L.P. Vieillot. Delightfully, “La Galerie” also includes an image of the species!

Lithograph from Galerie des Oiseaux featuring the Red-throated Caracara. This is presumably attributable to Godefroy Engelmann, a lithographer based in Paris.

 In addition to the new name, Ibycter Leucogaster, Vieillot contributed some real natural history to the scientific record, noting their loud calls and group living habits. In addition, having read Vieillot for the first time last week, I was shocked to read his statement that these caracaras are “ordinarily accompanied by toucans”. This habit, which apparently earned them the local name “Capitaines des gros-becs (Toucan Captains!), is not just some 19th century BS either, it was also made by Thiollay in his 1991 paper.

Thiollay noted several species that could be described as toucans accompanying the caracaras: The Guiana Toucanet Selenidera culik, Black-necked Araçari Pteroglossus aracari, Green Araçari Pteroglossus viridis, Channel-billed Toucan Ramphastos vitellinus and the Red-billed Toucan. The latter species was the one most commonly found accompanying the Red-throated Caracaras.  But we get ahead of ourselves. Let us stay in the first half of the 19th century, shall we?

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Red-billed Toucans often do follow Red-throated Caracaras. They also sound like a small dog barking.

In 1838, the first popular work to mention this species was published. The Society for the Diffusion of Useful Knowledge published their Penny Cyclopaedia with the express (and proto-socialist) idea to bring scientific knowledge to the working classes. This was kind of like the Wikipedia of 19th Century Britain. Here is their entry (with an illustration!) for the Red-throated Caracara (on the bottom right). This is part of a much larger section of falcons in general, and is quite commendable for its completeness.

The penny cyclopædia [ed. by G. Long].

This brings us to the middle of the 19th Century. Darwin was just about to arrive back from his voyage on the Beagle, Wallace was yet to set sail for Pará (where he would collect a Red-throated Caracara!), and the world of natural history was yet to be turned on its head by the revelations of Natural Selection as formulated by these two.

I am sure there are many taxonomic references I have left out that I could have usefully employed, but my attention must be elsewhere at the moment. I will return to the early world of ornithological literature, specifically the second half of the 19th Century at a later date. If you are eager to see a list of early synonyms and their references, look no further than page 22 of Strickland’s Ornithological Synonyms below.

synonymsThis is the short early history of the scientific description for just a single species of bird. Of course, there are many many others who share a more or less parallel track through the literature. What I find fascinating is that I can do a few short hours of study on the internet and bring to you this history without even visiting a library or a museum.  Thanks go out to the Internet Archive and the Biodiversity Heritage Library websites, who make trawling through and accessing this literature possible.  An thanks to you for reading!

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New post tomorrow!

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Tomorrow I will take you on a fabulous journey from the Enlightenment to the Industrial Age, and the first 85 years of scientific knowledge of the Red-throated Caracara!

Cheapskate Tuesday 3: Trigger Happy

No not the Weird Al song (although that is awesome).  I refer of course to radio triggers. What is a radio trigger? Well, very simply this type of device transmits a signal which then tells a receiver unit to make a pulse of electricity, which fires either a flash or your camera. If the transmitter is mounted on your camera, the trigger will command receivers to fire flashes or other cameras mated to receivers with a trigger cable.

I have been using the Yongnuo YN-602 triggers, but many of the more modern ones use a transceiver design, with each unit being able to act as both a transmitter and a receiver. The YongNuo products are cheap, and a transmitter with two receivers is about 54 bucks. Other brands may be even less expensive.

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How does this work in practice and what can it be used for? Well, this summer, while sitting in front of this Osprey nest in Port Moody, I had my camera set up on a tripod, with a 300 mm lens aimed and focused on the nest. Rather than stand by the tripod with my finger on the trigger, I mounted a receiver on the hotshoe and held the transmitter in my hand. This way I was free to move around and not jostle my camera while waiting for the very infrequent visits by the adult Ospreys. When an osprey was about to land, I would trigger the camera, which was set to high speed burst mode, and get some shots…Maybe not the most elegant shooting, but fun and relaxing.

This Bombus vosnesenskii, was taken with my 100 mm lens and Yongnuo triggers firing the two speedlights mounted to a special bracket on my camera (to be covered in an upcoming post). In this case, the trigger is being used for its most common purpose, namely to trigger flashes.

A sidelong portrait of the charming  Tailed Frog (also to be covered in an upcoming post) was also shot using the trigger to fire a flash, this time with a single speedlight with a Cheapskate Diffuser over the frog.

This unusual shot of a male Northern Flicker (Colaptes auratus) cleaning out the nest hole of baby poop was a bit more involved. It used two Yongnuo transmitters, one in my hand commanding a receiver attached to the “cable release” ( a 2.5 mm jack) to trigger the camera (as with the osprey shot), and the other transmitter on the hotshoe commanding a speedlight near the nest to fire.  This froze the bird in flight, and allows us to see what was going on.

These triggers can also be used for other things, such as triggering studio mains and other larger lights. Another useful trick is to combine them with Magic Lantern software to trigger recording of video on Canon DSLR’s. Probably the coolest usage would be to use them to trigger your camera in situations that would be impossible or too dangerous otherwise  such as near shy or dangerous animals. The range is about 100 m or so, so you will have lots of room!

These things are versatile and cheap, so get trigger happy!

Results of Weekend Expedition 3: Reifel

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Weekend Expedition 3 went off with no undue trouble thanks to Willow English, a phalarope researcher who drove us both to Westham Island and the George C. Reifel Bird Sanctuary. This was the first time I had been there in many years, the last having been on a field trip with my vertebrate ecology lab way back in undergrad.
The weather was a mix of fog, cloud, and sun, so no real dramatic lighting was available, but this is typical for this area in the winter. There were certainly a lot of birds, as this is one bird sanctuary where you are allowed to feed the wildlife (which, when you think about it, is kind of odd). I think these feeding opportunities made for some good photo opportunities  such as the sandhill cranes in closeup, as well as the low angel mallard shot. On the raptor front, we were not disappointed to find a sleepy Saw-Whet Owl dozing on a low limb with another somewhat higher. These have been spotted for several weeks now, and in general they seem to be reliably found at Reifel.

Overall, not so many surprises, but it was definitely worth the trip. And feeding Sandhill Cranes really is pretty awesome.
What did you get up to this weekend?

Weekend Expedition Plans: Reifel Bird Sanctuary

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I would like to get out to the George C. Reifel Bird Sanctuary on Westham Island, if I can arrange transportation… Folks have been shooting lots of cool stuff out there and I would like to give it a go.  The goal? Get out into new territory and not be such a homebody…If suitable transport cannot be arranged, I will have to wing it with the bus system.

The main work-related goal this weekend is to prepare a 40 minute talk on caracara foraging biology for next Thursday’s Les Ecologistes seminar.