Back from Costa Rica

January 17, 2012 • 7:30 am

I have returned from Costa Rica, but have a ton of work awaiting me, so posting will be light for about a week or so. The good news is that I have a ton of plant an animal pictures, with which I’ll regale/bore you over the next weeks.

But for a preliminary taste, here’s a map of our six-day route, with the stops listed in order.

I’ll put one picture from each stop except San Jose, and there will be a separate post (or two) on each area. Click the photos to enlarge, and do enlarge them (you can click twice with a pause in between, as the small versions in the post don’t do them justice).

A.  San José: the capital, much changed from my last visit in 1973, when I spent two months in the country taking a summer course in Tropical Ecology under the auspices of the Organization for Tropical Studies.

B.  San Gerardo, a small town near Chirripó National Park, location of the highest mountain in Costa Rica.  Here we spent a day hiking and botanizing in the montane rain forest.

General view of the area around the park, with a waterfall

Aracho, in the comments below, identifies this as “a fruiting Anthurium (Araceae, a monocot)”.

C.  Los Cusingos, a bird sanctuary that was acquired by the famous neotropical naturalist bird expert Alexander Skutch, who lived to be 100 (1904-2004). He built his home here, where he lived for the last 63 years of his life.  The home is still standing, and contains all of Skutch’s books, clothes, and possessions.

A butterfly that is a leaf mimic (it’s bright purple on the top side of the wings, but folds up its wings when resting.  There’s an eyespot, too.  Readers, feel free to identify these if you know them.

Two birds at a feeder near Skutch’s house.  The one on the right is a tanager of some sort, not sure of the one on the left. Readers, feel free to ID

D.  Biolley.  We spent two days here in this farming community on the edge of the fantastic La Amistad National Park, a huge area of undeveloped wilderness that extends south into Panama.

A stick insect, perhaps the most amazing example of camouflage I saw in Costa Rica.  I wouldn’t have spotted it at all except for the keen eyes of a local.  Note that the front pair of legs is extended out in front to increase the resemblance to a twig; the eye and head can be seen just to the right of center. This was at least eight inches long fully extended.

A flower. I’m not sure what it is (my knowledge of plants is horrible: the botanist Ledyard Stebbbins once called me an “animal chauvinist”), but I’m sure a reader will. Indeed, reader Arachno has just identified it as “a Tinantia (Commelinaceae) of some species”.

E.  The Firestone Reserve, once owned by the tire family and now a Center for Restoration Ecology, in which young volunteers (including Judy’s son) labor mightily to get rid of the bamboo that Ms. Firestone planted there as an experiment (it was to be used for building, but of course went wild and extirpated much of the surrounding vegetation).

A clearing in the bamboo, where we got our first sight of the Pacific.

Palm fruits, the source of palm oil.  The waxy material between the seed coat and the seed is pressed for its oil, which is very bad for you.  The fruits are left by the side of the road after harvesting from the palm, and picked up by trucks to be taken to a local factory for pressing.

We then drove up the beautiful Pacific highway and back to San José for the Evolution council meetings.  On the way, there’s a famous bridge over an estuary that harbors large numbers of huge and fearsome looking crocodiles:

F. La Selva. After two days of confabbing, we headed to perhaps the world’s most famous tropical field station, La Selva, for a day’s hike in the gorgeous wet forest there.  I spent two weeks in the place in 1973, and it’s been much enlarged.  Some of the trails have even been paved.

This is lowland rain forest at La Selva. I love it.

The famous strawberry poison dart frog, Oophaga (formerly Dendrobates) pumilio, which is polymorphic for color (the Wikipedia page shows an all-red one). This is the “blue jeans” morph. They’re quite toxic, and were used by natives to make poison darts, hence the name. I was told by the guide that the toxic substance in the skin is actually acquired from ants on which the frog feeds.  I picked one up (they are tiny, less than an inch long):

We ran across a pair of great currasows (Crax rubra), which let us get quite close.  These galliform birds are sexually dimorphic: the males are black with a yellow ornament on the bill; females are brown.  They are monogamous, and the fact that both have crests may represent the result of mutual sexual selection:

And what travel post would be complete without food? Here’s a typical Costa rican meal we had at a truck stop:  arroz con pollo, plantanos, piña (the local pineapple is wonderful, though destructive to the ecosystem when grown; but there’s nothing as delicious as a plant-ripened piña), a fruit drink whose origin I can’t recall (there are a huge variety of delicious drinks made with local fruits, served as either aguas (juice) or batidas (like a smoothie, mixed with milk):

I’ll have tons more pictures, including some lovely flowers and birds, peccaries, and the amazing house of a Costa Rican artist, made entirely out of recycled material, over the next couple of weeks. But first I have to sort out my day job. . .

Opossums do hang out

January 16, 2012 • 9:37 pm

by Greg Mayer

(Update below). In comments on an earlier post, it was mentioned that opossums’ having a prehensile tail was a myth. But it isn’t: opossums of several species, have prehensile tails, and use them to hang in trees. Here’s an example.

Wooly opossums, Barro Colorado, Panama, 1928. Field Museum photo

Here’s a closer one, but the branch is out of the picture.

Wooly opossum, Barro Colorado, Panama, 1928. Field Museum photo

And here’s a Virginia opossum.

Virginia opossum. University of Maryland mammalogy.

There are lots of other photos on the web. Try here (the cutest), here, and here. I’d have posted these in the comments on the earlier post, but some quirk of WordPress (or perhaps my understanding of it) allows video but not stills in comments.

UPDATE. Diane G. suggests tail use is more common in juveniles, and that suggestion is born out at least by the relative frequency in images found by Google. The following picture from the 9th edition of the Encyclopedia Britannica (1875-1889) shows juveniles using their tails on their mother.

Caluromys derbianus, Encyclopedia Britannica, 9th ed.

Why are there no freshwater cephalopods?

January 16, 2012 • 10:30 am

by Matthew Cobb

Not in a lake near you: a blue ringed octopus, courtesy of http://www.ucmp.berkeley.edu

Last year we discussed one of the questions I routinely ask my students – why are there no insects in the sea? Today’s poser is a question a student, Xaali, recently asked me: Why are there no freshwater cephalopods?

Now I don’t know much about molluscs (arthropods are more my bag), but the main reasons might be:

• Salinity (but other molluscs seem to cope quite well, and what about low salinity areas in estuaries? Is it all to do with the cephalopod ‘kidney’?)

• Oxygen levels (but is there really a difference between freshwater and marine O2 levels?)

• Food availability or some other ecological factor (but there are some pretty big bodies of freshwater out there, so this seems unlikely)

Whatever factor is involved (and there may be more than one), it would presumably have to be pretty substantial. Although the idea of cephalopods migrating up rivers to lakes might seem unlikely, at least some freshwater lakes will have been formed from inlets where cephalopods were presumably trapped, and then died out as the water turned less saline.

So, WEIT readers, what are your hypotheses? And above all how could you test those hypotheses?

For those who’d like an introduction to the issue, there is this thread over at tonmo.com which has stretched over a couple of years… Try not to repeat those folk!

Oh, and I expect PZ to weigh in here!

The playful, brainy, and destructive kea

January 16, 2012 • 4:01 am

I’m back in civilization for the nonce.  Having seen Matthew’s posting of a playful crow (and yes, I think it’s play), and having read several readers’ comments on the playfulness of the kea, I thought I’d put up a few kea videos. (Thanks to Matthew, by the way, for a terrific job of posting, which I hope he’ll continue for the next week!)

The kea (Nestor notabilis), is an endangered, omnivorous parrot that lives on the South Island of New Zealand.  The bird is famous famous for their intelligence, playfulness, and ability to outwit humans in many ways, which you’ll see in the Attenborough video below.  They are powerful birds with massive beaks, and are known for ripping apart the rubber and vinyl parts of cars.

Here’s a kea rolling a snowball.  One can’t interpret this as a food-related action; it looks to me for all the world like play:

Here’s an Attenborough documentary, showing how smart (and destructive) these birds are.  The demonstrations and scientific tests of their keen intelligence begin about five minutes in:

One famous aspect of kea behavior, which I learned about in college, is their ability to use those beaks to rip open the backs of living sheep, tearing through the wool to snack on the fat beneath.  Long subject to controversy, this behavior has now been confirmed. It’s an example of an “exaptation,” or the ability of an animal to use an evolved trait or behavior to do something completely novel. In this case, a beak evolved for eating a variety of foods has helped it become the world’s only parrot that preys on large mammals.  Here’s the behavior taken from an Attenborough documentary.

Will this lead to the evolution of a carnivorous parrot.  I don’t think so–sheep-fat eating is an opportunistic behavior, and probably can’t provide the main source of food for these birds.  But who knows? We wouldn’t be around when it happens, and many new animal lifestyles begin in this way.

Grasses, live oaks, pines

January 15, 2012 • 3:14 pm

by Greg Mayer

There are some interesting comments on live oaks, their distribution, and resistance to hurricanes in the discussion (see #5) of my post on Long Beach, MS and its cuisine. One thing I’ve noticed is the striking zonation of the vegetation on the Mississippi Gulf Coast. Just a few miles inland, the live oak forest along the coast gives way to a forest strongly dominated by pine. Here’s a pine forest, less than two miles north of the water.

Pine forest, Long Beach, MS

This pine forest continues considerably far inland, becoming mixed with broadleaved deciduous trees around Hattiesburg.

Mixed deciduous/pine forest, Rte. 49, Mississippi

The live oaks dominate in a narrow strip along the coast.

Live oaks along Beach Blvd. (the coast highway); note white sandy soil.

And the beach itself supports grasses.

The beach, Long Beach, MS.

Jamaican me hungry

January 15, 2012 • 12:58 pm

by Greg Mayer

One final culinary note on the Mississippi Gulf Coast. Gulfport, just to the east of Long Beach, is a larger town with an active sea port, and a greater diversity of culinary offerings. Most notable is the variety of Oriental cuisines, including Thai, Vietnamese, and Japanese, in addition to Chinese. I’ve had good Vietnamese food there (many Vietnamese immigrants took up fishing along the Gulf Coast), and I’ve received favorable reports on the sushi. But on my last visit I got a chance to visit a new (about 6 months old) Jamaican restaurant, the Jamerican Caribbean Cafe .

Jamerican Caribbean Cafe, Gulfport, MS

I’ve spent a fair amount of time in Jamaica, especially as a grad student, and my main meal of the day was often patties and a Red Stripe. The sign offering curry goat (hard to get in Wisconsin) and jerk was irresistible. While traveling in Jamaica, I’d visited the original Boston Jerk Center, in Boston Bay, as well as others (signs in Kingston hailing the availability of Boston jerk were amusing, especially to someone living in Cambridge).

Jamerican Caribbean Cafe, Gulfport, MS

The owner, originally from Ocho Rios, served us. Curry goat was not available that day, and the patty supply had been wiped out by the lunch crowd. My daughter had the jerk chicken, while I went for the brown stew, which is a dish I didn’t know from Jamaica. Both were excellent, the jerk spicy, the stew milder and sweeter with root vegetables. In both, the chicken was prepared in the cleavered Jamaican style. The Red Stripe and ginger beer (a very strong style of the latter) also satisfied.

Mississippi Yearning

January 14, 2012 • 10:33 pm

by Greg Mayer

During a recent visit to the Mississippi Gulf Coast I was able to sample the culinary offerings of Long Beach, a small town right on the water. Long Beach has resisted casinos, Walmart, and other unwanted development, and so it presents a longer stretch of uncluttered sand beach than surrounding communities. Like other towns on the Coast, it was hit hard by Hurricane Katrina, and wind-sculpted oaks along now empty lots on the coast show that the climate has shaped this area for a long time.

Wind-sculpted oaks.

Long Beach’s redevelopment has focused on its downtown, a few blocks from the beach. Restaurants are among the prominent features.

Hancock County Bank Building (one of the oldest buildings in town), Long Beach, MS

Most famous is Darwell’s Cafe, at the northeast side of downtown, just south of the railroad tracks. In this part of Mississippi, the predominant cultural influence comes from the direction of New Orleans.

Darwell's, Long Beach, MS

I had shredded smoked pork with barbecue sauce on the side, my daughter had the etouffe, and my wife couldn’t decide, ordering the sampler with etouffe, gumbo, and shrimp creole.

Darwell's etouffe
Darwell's sampler

When we arrived the place was packed, but Darwell himself found us a table, not far from the live entertainment (a trio: drum, guitar, trombone).

Darwell Yeager

Earlier we’d had lunch at Lil’ Ray’s, in the heart of the downtown, where po boys were the order of the day. These sandwiches, on a light french bread, come dressed with lettuce, tomato, pickle, and mayonnaise. I had a cajun popcorn (=crawfish) po boy, with a side of gumbo.

Lil' Ray's, Long Beach, MS

Both Darwell’s and Lil’ Ray’s have varying degrees of eccentric local character (well, Darwell’s has loads of it), but another dinner was at a less place-bound restaurant- you could find similar establishments in many other locales. The Harbor View Cafe, built since the hurricane, has a broad veranda, that does indeed afford a view of the Gulf.

Harbor View Cafe, Long Beach, MS

I had the Crawfish Monica, pasta with lots of crawfish, and a delicious, chocolatey Jefferson Stout, from Mississippi’s own Lazy Magnolia brewery.

Crawfish Monica at the Harbor View Cafe
Lazy Magnolia's nut brown ale; I didn't get a picture of the stout.

And for dessert, a fine selection of cakes.

Desserts at Harbor View Cafe, Long Beach, MS

How good a meal is depends upon the quality of the food, the ambiance, and, when traveling, how much the food reflects the local ingredients and traditions (rather than something you could get anywhere). On all these points, Darwell’s etouffe is the standout, so if you have only one meal in Long Beach, go to Darwell’s for the etouffe.

Cantilurday viperid: Mexican mocassin

January 14, 2012 • 4:32 pm

by Greg Mayer

The cantil (Agkistrodon bilineatus), or Mexican moccasin, is a pit viper closely related to the water moccasin and copperhead of the United States. Like a number of other snakes, it moves its tail in a manner thought to attract the attention of prey, enticing them to come closer or look away from the snake’s business end, a behavior called caudal luring.

Juvenile cantil, Agkistrodon bilineatus, showing caudal luring.

In juvenile cantils, the effect is accentuated by the bright color of the tail tip; this color fades with age.

A second juvenile individual of Agkistrodon bilineatus.

There are several subspecies, distributed discontinuously from northern Mexico to northern Costa Rica. I’m not sure which subspecies the ones pictured here are.

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Parkinson, C.L., K.R. Zamudio and H.W. Greene. 2000. Phylogeography of the pitviper clade Agkistrodon: historical ecology, species status, and conservation of cantils Molecular Ecology 9:411-420. pdf