Category: Notes from the Field Page 13 of 22

Male-Male Interactions in Anolis maynardi

The winner

Bright green male who won the fightAn instantaneous color change for the loser.

Two adult male A. maynardi were sitting on a flat tile deck about 6 inches apart with dewlaps exposed and head crests up. There was much head bobbing and they showed their bright yellow dewlaps by turning their heads sideways. Then fast wrestling occurred – It looked like they were using their mouths to bite each other — with the participants separating briefly before repeating the wrestling, during which they turned each other over and over. We (humans) may have precipitated the end of this bout by opening a door to get a camera, but one male ran off the deck down the vertical wall and the other stayed to watch. At this point a small female ran between the two towards the male nearest the deck. After 10 minutes the male that moved off first is sitting on a hand rail and has changed to his dark color, while the other male remains on a step still bright green.

Also: a brief note on nocturnal feeding. We had our first decent rain of the season on the 24th April and on coming home at about 8.30 pm, a large cosmopolitan gecko and a male A. maynardi were sharing the same wall and feeding on insects attracted to the outdoor lights.

Panfish Pole Alternatives

Comparison of panfish poles, click for larger image

In a comment a few months ago I promised a review of alternatives to the beloved but discontinued long-backordered, Cabela’s Telescopic Panfish pole.  As of Monday, Cabela’s claims that the panfish poles we have grown to love will be available again on May 6th. With any luck they will be back to stay and the review that follows will be moot, but after being fooled by two previous restock dates that came and went, we set out to evaluate alternatives. Read on for a review of each.

A Giant’s Snack And As A Snack (itself)

Even with their large size, and one spending quite some time in their territories, it is somewhat difficult to find a Giant Anole during the day in the Dominican Republic. The most widespread and common species (at least in the Dominican side) is A. baleatus, which is not an unusual sighting at the mesic riparian forest of “Gran Cañada” in the botanical garden of Santo Domingo. But even there, observations are limited by spotting an animal right after it moves to hide away from view (squirreling or slowly sliding around tree trunks). The population in this particular locality seems to be stable and not pursued by people, whom locally have the misbelief that they are aggressive and harmful to humans.

Regarding a local species, A. barahonae, possibly the first encounter I had with this species was back in 2003, in the hills above Enriquillo, southwest of Barahona, where through binoculars, I saw at the distance and high in a large tree a White-necked Crow (Corvus leucognaphalus) holding a large, strong, greenish anoline lizard it its beak. Although I couldn’t see many details of the lizard, I think it must have been A. barahonae because it is the only Giant anole known from that locality. The White-necked Crow forages mainly in flocks and in the canopy, so I suppose that they represent a common predator to that anole species.

After that encounter, I have seen just a few more to date: one basking in a large tree in a shade coffee plantation, also in an epiphyte-packed tree in a cloud forest. This time (yesterday), a fellow local biologist and I were exploring some rivers in the Nizaito watershed, also south west of Barahona. Specificly at a tributary stream that pours into Río Paraiso, while taking photos to a basking Ameiva taeniura aside the road, about 11:00 a.m., I heard some noise coming from a nearby cluster of rather young Cecropia trees. Then my attention was caught by a glimpse of the wing beats of a sphinx moth, soon realizing that it already was in the mouth of a Baoruco Giant Anole. The anole kept still while holding its prey, with tail hanging outwards off the leaf where it was perched.

Unfortunately, I didn’t see the action before the attack happened, but as seen in the pictures, the dead leaf of the Cecropia was probably the perch that the moth used for roosting throughout the day. As most moths are nocturnal in habits, it is likely that it was inmobile siting there just relying in its cryptic coloration and pattern. In an earlier post: A. cuvieri On The Prowl, some excellent photographs by fellow naturalist Father Sanchez showed a Puerto Rican Giant Anole (Anolis cuvieri) deliberately moving about at moderate heights and using several kind of perches. I often imagine that all these anoles would take their prey mostly up in the canopy or high in the tree trunk, but these photographs of the A. barahonae eating this moth were taken at a height of 3 meters, atop of a small tree (Piperaceae) almost overlapping with a taller (8 m) Cecropia tree. Previous to when I heard the sounds coming from the attack, I didn’t notice any motion in the area as I was pretty close. The anole may have been stalking or more likely foraging and scanning this (unusual?) substrate in search of random prey.

The Anoles Of Guadeloupe

Guadeloupe is composed of two islands whose shape is that of a butterfly and that were joined together in 1806 by the wooden Union Bridge and then the Gabarre Bridge in 1929:

  • Situated to the west, Basse-Terre has an area of 848 km2. This is a volcanic mountain whose summit is the Soufriere, located at 1467m altitude. It is covered with a dense rainforest with many rivers and waterfalls.
  • Situated to the east, Grande-Terre has an area of 586 km2. The substrate is limestone and consists of a plain bordered by a mangrove forest in the southwest, an irregular succession of hills called “les Grands Fonds” in the center and an arid plateau of rocky coasts in the north.

The species of endemic Anolis of Guadeloupe is called Anolis marmoratus, with reference to the orange marbling on the head of the specimens described by Dumeril and Bibron in 1837. In fact, Anolis marmoratus is a species which has 6 subspecies of Guadeloupe and six others on the islands around (La Désirade, Petite Terre, Marie Galante, Les Saintes, Les ilets Pigeons, Les Ilets Kahouanne, les Ilets Fajous).

Regarding Anolis marmoratus of Guadeloupe, the subspecies are:

Anolis marmoratus marmoratus

Anolis marmoratus marmoratus, which Lazell in 1962, noted as “the most beautiful anole he never saw.” It lives around Capesterre, at the southeast of Basse-terre. Adult male are apple-green, shading to blue on the tail and yellow-green on the limbs. The head, the neck and the orbital area are marbled with orange, the throat fan orange-yellow with yellow scales. Preliminary work we have conducted suggests that it could be classified as a trunk-ground ecomorph.

Anolis marmoratus girafus

Anolis marmoratus girafus that lives along the west coast of Basse-Terre in the driest area of this island.

Rare(ish) Puerto Rican Anoles

Another Revell Lab (Liam, Kristin, Graham) trip to Puerto Rico this spring, and another series of encounters with the diminutive Anolis occultus and the spectacular Anolis cuvieri. Both of these species can be quite challenging to find, but we have had some good success in several locations in the Puerto Rican karst region.  In January, we observed many individuals of both species

            

And managed to get a few in-hand for pictures

    

We also found a juvenile cuvieri, which has a gray coloration and an ontogenetic shift to green as they age:

Unless they happen to be one of the brown morph adults,

Portion of the Dewlap 100% Transparent!

During our Anolis distichus work in the DR last summer, we found one male who had a portion of his dewlap that was completely transparent!

Holey dewlapped Anolis distichus from near Higuey

Of course, there was a hole in his dewlap. (Sorry Manuel).

It’s fairly common to find male anoles with damaged dewlaps. Sometimes there’s a hole punched through like the individual pictured here. (Did he snag it on a thorn? Was he pecked at by a bird?) Other times, the hyoid process is broken such that the dewlap doesn’t fully extend, if it extends at all. Yet these males often successfully hold territories that include females.

A previous post on AA asked, “What’s all the fuss about dewlaps?” Link to that post to read about research that experimentally reduced or disabled the dewlap to study the consequences. These studies did not find an appreciable effect of a disabled dewlap on the outcome of male-male battles (staged in the lab) or on copulation success (measured in the field after dewlap manipulation). These results suggest, counterintuitively, that dewlaps may not play a large role in reproductive success.

Anolis woodi at Las Alturas

Participating in the Organization for Tropical Studies’ course in tropical biology recently took me to amazing Las Alturas, a satellite field station of the Las Cruces Biological Station in southern Costa Rica. The site is adjacent to the La Amistad Biosphere Reserve, close to the border with Panama, and hiking around Las Alturas takes one into some beautiful primary forest. Returning from a long hike, course-mate Amy Miller and I happened upon this anole:

Anole at Las Alturas

Veragua Rainforest: An Anole Mecca

 

One of the many frogs at the Veragua Rainforest preserve. The frog diversity is so great, it almost rivals the anoles in interest. Photo from http://veraguarainforest.com/research/imagenes/overview_small.jpg

Fresh from our four day foray at La Selva, our class of intrepid herpetologists moved east to the Veragua Rainforest Research & Adventure Park. Take one glance at their website, and you’d think this is some tacky tourist trap. But you’d be wrong. Only four years old, this multi-purpose venue is a wonderful place for biodiversitistas of any sort. Admittedly, a bit too touristy at first glance—the place is a regular stop for cruise ship passengers to take a break from playing online slots at casinos in Colorado at EasyMobileCasino.com and to disembark for the day at the port city of Limon. The facility has excellent educational displays with wonderful live collections of frogs (in the Ranario), reptiles (Reptilio), butterflies and other insects. Not to mention the ziplines, which we were duty bound to use in our quest to locate canopy dwelling lizards (one probable A. lemurinus was cited approximately 25 meters high on a tree trunk).

But Veragua is much more than a fun place to stop-over.

More Cristatellus Adventures in Costa Rica

Brown basilisk. Photo from http://www.naturephoto-cz.com/photos/sevcik/brown-basilisk--_DSC9899.jpg

A little more than a year ago, this correspondent trekked to the eastern coast of Costa Rica to chronicle the spread of the invasive Puerto Rican anole, A. cristatellus. Introduced to the Caribbean port city of Limon many moons ago, we found that the crested anole has made its way down the coast to the vicinity of the Panamanian border, and speculated that it may also have crossed the bridge to the Land of the Canal. In addition, it has spread inland to the west, as far and as high as the town of Turrialba and, at lower elevations, to Siquirres, 60 km from Limon. However, 37 km further west, we failed to find it in Guapiles, though our visit was late in the day. Given its widespread occurrence at low-to-mid elevations, we predicted that the Puerto Ricans may some day advance far to the north and west, trampling through the Tortuguero area to Nicaragua and who knows how far westward?

Taking advantage of our herpetology class sojourn to Costa Rica, I led an intrepid expedition comprised of a freshman, a sophomore, and a graduate student to head eastward from the La Selva Biological Station to determine just how far these lizards have advanced.

La Selva Lucky Seven

Anolis carpenteri. Photo from http://ctaudubon.blogspot.com/2011/04/young-researchers-shine-during-costa_05.html

We notched the double anole hat trick in the most unexpected manner last night, as a female of that rarely seen species, A. carpenteri, presented itself sleeping at chest level on an isolated plant in the clearing. With a day yet to go, hope springs eternal that a resplendent green A. biporcatus will make it a lucky seven at La Selva.

News flash—breakfast! Just learned that last night, the team headed for a ditch filled with caimans found an A. biporcatus sleeping on a branch above the trail. Seven anole species in two days!

Seven anole species at one site (eight if we include the unseen A. pentaprion). Certainly, a lot of anole diversity, but not unheard of in any way. In fact, such diversity occurs regularly on the Cuba, Hispaniola, and Puerto. Yet, the anole ensemble here differs greatly from what we would see in a diverse Caribbean community. All species-rich assemblages in the Caribbean are extremely similar, composed primarily of the different ecomorph types. Usually, such a location would have very common trunk-ground and trunk-crown anoles, and then representatives of three or all four of the remaining ecomorph types. The remaining species would either be some of the “unique” habitat specialist types which occur only on one island, such as the rock wall specialist A.bartschi on Cuba or members of the Chamaelolis clade; or they would include multiple members of the same ecomorph type, such as several trunk-ground anoles that use different thermal microhabitats.

By contrast, the La Selva Eight bears little similarity to these assemblages.

Page 13 of 22

Powered by WordPress & Theme by Anders Norén