Jenssen - p. 2 
In this regard he contrasts opalinus with brevirostris, which he is also 
examining, which have a complex repertoire (at least of display types) which, 
however, appears (without final analysis) stereotyped. 
Jenssen finds this contrast intriguing and thinks that in the smaller 
fauna in Jamaica evolution of characters for species recognition has taken a 
different turn and has, for the very closely related forms A. opalinus, A. 
grahami and A. garmani, meant that they have diverged morphologically (i.e. 
in size, in some scale characters and in body color) while keeping a common 
dewlap color and many similarities (and at least remarkable variability) in 
their display repertoires. 
Jenssen also has underway a report on the one - A. grahami-A. lineatopus 
neckeri - hybrid that he found during his year long stay on Jamaica, The 
displays of the suspected hybrid were photographed before it was submitted 
to electrophoresis by Preston Webster and resulting confirmation of its 
hybrid status. Its morphological characters have been studied by Jenssen and 
its displays have now been compared with those of A. grahami and will be 
compared with those of A. 1. neckeri. The morphological characters in part 
resemble grahami, in part neckeri, in part are intermediate. The hybrid 
display appears to show close affinities to that of grahami. 
As incidental intelligence and an indication of the variety of behavior 
possible in the genus Anolis, Jenssen reports that large adult females of 
A. limifrons may be solitary and occupy territories that are even exclusive 
of permanent males, 
Both Jenssen and Rand are much interested in the visual phenomenon of 
critical flicker fusion frequencies (CFF). The speed of resolution of the 
displays so important in anole behavior is related to the speed of flicker 
fusion. Similarly, an animal's ability to quickly negotiate a complex 
habitat, identify and catch swift prey and avoid fast-moving predators is 
partly dependent upon its CFF, 
Jenssen has invented an apparatus for measuring the CFF values for 
Anolis and he and his student, Edward Hover, have now tested quite a variety 
of anoles, including auratus, onca, Jamaican sagrei, grahami, Florida 
carolinensis, opalinus, garmani, distichus, valencienni, Panamanian limifrons, 
lineatopus lineatopus, lineatopus neckeri, brevirostris, oculatus 
Correlation is apparently with habitat insolation: onca and auratus and 
cabritensis have the highest values, lineatopus neckeri and limifrons the 
lowest, the other species intermediate, As Jenssen says, this result seems 
somewhat anomalous for Jamaican sagrei, essentially a terrestrial anole of 
very open areas. However, ancestral sagrei, as he points out, is an edge 
species, hence intermediate values of CFF may reflect ancestral rather than 
present conditions, if we assume that there has not been time to evolve to a 
new adaptive level. 
