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Letters.

To tree or not to tree?

"Should we junk Linneaus?" (SN: 10/23/99, p. 268) failed to note a fundamental division among systematists. "True Tree-ers" believe that viewing a phylogenetic tree is tantamount to viewing evolution. "Practicing Cladists" believe that cladograms are hypotheses to be tested with further data and rejected if a better hypothesis is found. Basing a nomenclature on unknowable characters for hypothetical ancestors, as engendered by the uninomial nomenclature of True Tree-ers, accepts ignorance as the final answer. Continual improvement of phylogenetic hypotheses and associated improvements in nomenclature to reflect that increased knowledge is advocated by Practicing Cladists. Which seems like the scientific method?

James K. Liebherr Ithaca, N. Y

There may be a valid evolutionary basis to the current taxonomy system. Today's taxonomists, when they were toddlers, undoubtedly had the same drive to name and categorize as all the rest of us. "Bird!" they would shout enthusiastically. "Yes," Mom would reply fondly, "bird, chicken," or "No, not bird, butterfly." This behavior suggests that Linneaus did not invent systems of nomenclature, he tried to formalize kinds of nomenclature already present as unique names grouped in hierarchies. Shouting encouraging jargon to each other, guided by the narrow-beam flashlight of pure reason, modern taxonomists who feel that the names and hierarchies given to organisms don't reflect reality are eagerly and bravely leading the way into total obscurity.

Mark Deyrup Archbold Biological Station Lake Placid, Fla.

I agree that the current Linnaean hierarchy may have its shortcomings, but I have a serious problem with the proposed new scheme of classification. As the article states, Porter "predicts PhyloCode will develop into a parallel system and will require us to become bilingual." Cantino goes on to say, "We are simply making an alternative available." What's the problem with alternatives, you ask? Well, let me direct your attention to your article "Math error equals loss of Mars orbiter" (SN: 10/9/99, p. 229). This article illuminates the problem with alternatives to established scientific protocols.

Aaron Wendt College Station, Texas

Tale end?

Perhaps there is a simple solution to the controversy between paleontologists and molecular biologists over whether whales are descended from mesonychians or artiodactyls ("The whales tale," SN: 11/6/99, p. 296). Primitive whales may not be ancestral to more modern ones. Both sides in the controversy would thus be vindicated: Ambulocetus, Pakicetus, and their more fully marine descendants in the extinct whale suborder Archaeoceti would in fact be descended from mesonychians, while the two extant whale suborders would share a common ancestor (probably more recently) with hippopotamoid artiodactyls. If this is the case, then the key transitional forms leading to true whales have not been discovered yet.

Clark Welder Fenton, Mich.

Dumb or numb with fear?

"When monkeys play dumb" (SN: 11/6/99, p. 299) suggests that subordinate monkeys play dumb when in the presence of dominate males to avoid attracting retaliation from the dominant animals. An alternate explanation is in "Grown-up monkey brains get growing" (SN: 3/21/98, p. 180). This article indicates that hippocampal memory formation and learning of information may be disrupted by a stress reaction to an aggressive animal. Perhaps the mere presence of the dominant males was a stress to the subordinate males, causing the poor performance.

Cynthia Swacina Rockton, Ill.

Do monkeys who play dumb produce fewer new neurons than monkeys who don't? Or does playing dumb reduce stress enough to leave neuron generation unaffected? These questions remain unanswered.

--B. Bower
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Publication:Science News
Date:Jan 15, 2000
Words:580
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