Year: 2013 Page 27 of 37

Two Anolis marmoratus males fighting on Basse Terre, Guadeloupe

When it comes to territorial behavior male anoles tend to get all the attention. I suppose it makes sense – nothing catches the eye like a brightly colored male doing a few dewlap extensions or engaging in a dramatic battle. It would be a bit of an understatement to say that we like to talk about male-male territoriality and aggressive encounters on this blog (1, 2, 3, 4, 5, 6, and the list goes on!). In fact, we’ve even had photo contests to document the best fights, which tend to feature large, colorful males.

Perhaps it’s no surprise, but females can be just as aggressive as males. At SICB this past January, I learned about Jessica Edward’s research on aggressive encounters between Anolis carolinensis and A. sagrei. It turns out that the victor of female-female staged encounters was nearly always A. sagrei. There are plenty of interesting papers on the topic, for those that are interested (1, 2, among others).

Figure 1. The author waiting for the sun (and the lizards) to come out.

Regardless, I was completely caught off guard during my field expedition last summer to the Dominican Republic when a female A. armouri engaged in a territorial display against a male intruder. Along with Ellee Cook, an undergraduate at Trinity, I was catching A. armouri near Loma de Toro high in the Sierra de Baoruco, the mountain chain that runs between Haiti and the Dominican Republic in the southwest of the island. It’s frequently rainy and overcast at these high elevations and we spent most of our time languishing in the drizzle and waiting for the lizards emerge, as evidenced in Figure 1 and Figure 2.

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Within the framework of my PhD, I examine what determines dewlap diversity in Anolis sagrei and aim to improve understanding of the morphological, performance and behavioural variation within this species on diverse Caribbean islands. Last month I was sampling a few brown anole populations on the Cayman Islands and I encountered some interesting curly tail – brown anole interactions, which might be worth mentioning on Anole Annals. Previous observations have shown that curly tails (Leiocephalus carinatus) do eat a lot of anoles, including A. sagrei; see previous posts (<1>, <2>, <3>, <4>)

Curly-tailed together with plasticine anole model on Cayman Brac

Our sample site at Cayman Brac consisted of a very dense brown anole and curly-tailed population living together. To make an estimation of the relative predation pressure, I generally place 120 plasticine anole models per sampling site and recollect them after 48 hours to score for predation marks. Because of the high abundance of curly tails on our site in Cayman Brac, I expected to recollect many attacked plasticine models, but instead… (see pictures). The curly-tailed does not intend to attack the model, but is trying to copulate with it! A rather unexpected observation from my point of view. Of course, the models are not moving and the chemical cues are completely absent, but still… Furthermore, I made lots of  behavioural observations on A. sagrei individuals and had the impression that they didn’t care at all about the presence of curly tails close by. The brown anoles were often perching within less than 1.5m  of a curly-tailed and still very relaxed; and vice versa, the curly tails didn’t really care about the brown anoles sitting near. In contrast, when a red-legged thrush (Turdus plumbeus) was approaching, all anoles in the close surroundings escaped very fast.

Conclusion: it seems that curly tails on Cayman Brac ‘love’ their prey…

httpv://www.youtube.com/watch?v=3ni3QbKgesI

Last year Martha Muńoz posted on AA about odd behaviors of captive anoles.

Following recent posts about the production of “slugs” or infertile eggs, I thought the readers of AA might be interested in this short (low quality) video of  an A. apletophallus female eating her infertile egg. I think this was a very rare event (only observed once – out of many females) and probably an artifact of being in captivity. Possibly the egg rolled off a leaf or branch and the female grabbed it thinking it was an insect. In the wild the infertile eggs would be consumed very quickly by any number of things – like ants or fungus.

Like others breeding anoles, I have thought a lot about the production of infertile eggs. Female A. apletophallus are egg factories; in the absence of sperm they will produce infertile eggs continuously. I have always thought this was strange – it seems like a waste of resources – why don’t they reabsorb or eat their infertile eggs. The female “knows” the egg is infertile – it is deposited with little or no shell and she does not bury it like a fertile egg.  I presume hormones play an important role in governing this bury or do not bury behaviour. In the case of apleotphallus, all mature females have sperm and when they are relocated into captivity will produce fertile eggs. So I think it is fair to say that in nature they are never lacking sperm, so they will not produce infertile eggs often. Hence under normal circumstances there is no cost to producing these “slugs.”

That’s one beat up looking old dude, but apparently he’s still got it. Or does he? She seems to have one foot out the door.

We’ve been following the backyard anole antics reported in Daffodil’s Photo Blog for some time now, and Easter provided a heartwarming photo-story of an old guy who can still find some love. And this old guy seems like he’s seen some better days.