Billy Goat wrote:
Evolution, like all scientific theories, is the work of detectives.
The evidence points to evolution, and anyone who studies the evidence
discovers evolution.
Really? Please explain why botanists tend not to agree. Please explain
why biologist are merely convinced that speciation occurs rather than
know for certain that it does.
Alternatively please make wild assertions or perpetrate a thread slink.
"Third, the literature contains many instances where a speciation
event has been inferred. The number and quality of these cases may
be evidence enough to convince most workers that speciation does
occur."
"There is no unambiguous criterion for determining that a speciation
event has occurred ..."
"There are a variety of different species concept currently in use by
biologists. These include folk, biological, morphological, genetic,
paleontological, evolutionary, phylogenetic and biosystematic
definitions ..."
"The applicability of the Biological Species Concept is also questionable
in those land plants that primarily self-pollinate (Cronquist 1988). A more
serious criticism is that the BSC is inapplicable in practice."
"Criticisms of the Biological Species Concept: There has been considerable
criticism of the theoretical validity and practical utility of the BSC.
(Cracraft 1989, Donoghue 1985, Levin 1979, Mishler and Donoghue 1985, Sokal
and Crovello 1970). The application of the BSC to a number of groups,
including land plants, is problematical because of interspecific
hybridization between clearly delimited species (McCourt and Hoshaw
1990, Mishler 1985). There is an abundance of asexual populations that
this definition just doesn't apply to (Budd and Mishler 1990)."
"It is not coincidental that the BSC is less widely accepted among
botanists. Terrestrial plants exhibit much greater diversity in their "mode
of reproduction" than do vertebrates and insects. "
"Finally, most of the current interest in speciation concerns theoretical
issues. Most biologists are convinced that speciation occurs."
Observed Instances of Speciation
Joseph Boxhorn
http://www.talkorigins.org/faqs/faq-speciation.html
The Talk.Origins Archive
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