all herpetology stories

Losos’ lizards give evolutionary clues in island experiments

50443248 — Mon, 01 Oct 2007 15:41:16 -0400

Tiny islets in the Bahamas have proven useful laboratories to illustrate natural selection’s effects on island lizards, which saw their legs lengthen, then shorten as ground-dwelling predators drove them into the trees.

The experiments capped years of research into a type of lizard called an anole on the Caribbean islands. The research, conducted by Jonathan Losos, the Monique and Philip Lehner Professor of the Study of Latin America, examined the relationships between lizards that shared similar habitats and characteristics but lived on different islands.

Losos described his research Tuesday (Sept. 18) during the kickoff talk in this year’s lecture series sponsored by the Harvard Museum of Natural History (HMNH).

Eggs, nests make colorful bedfellows at HMNH

50443248 — Tue, 02 Oct 2007 11:00:00 -0400

Large and small, plain and colored, splotched and dotted, eggs from the Harvard Museum of Comparative Zoology’s vast collection are on display at the Harvard Museum of Natural History in a new exhibition of eggs and nests.

The nests, like the eggs, come in all shapes and sizes. Unlike eggs, which have the same basic plan, nests vary greatly in complexity, from the simple dirt mounds of reptiles to the elaborate creations of Africa’s weaver birds to no nests at all.

Pressured by predators, lizards see rapid shift in natural selection

Thu, 12 Jul 2007 09:30:50 -0400

Countering the widespread view of evolution as a process played out over the course of eons, evolutionary biologists have shown that natural selection can turn on a dime - within months - as a population's needs change. In a study of island lizards exposed to a new predator, the scientists found that natural selection dramatically changed direction over a very short time, within a single generation, favoring first longer and then shorter hind legs.