[Taxacom] Biodiversity questions: Classifications
Dan Lahr
dlahr at ib.usp.br
Fri Oct 4 07:13:49 CDT 2013
I never understood the argument that taxonomy is not science. It is about
one of the most nonsensical things that are out there.
Is analytical chemistry not a science? Astronomy?
These are all about describing natural objects. I wonder if theoretical
physicists are also saying that astronomers are a bunch of stamp
collectors...
On Fri, Oct 4, 2013 at 8:34 AM, Chris Thompson <xelaalex at cox.net> wrote:
> Thanks, John,
>
> Yes, there are other measures that could be used to base the category RANK
> on.
>
> The only question is whether they would be more informative and easy to
> use.
>
> For example, no one has yet to mention the Ernst Mayr approach. That is,
> rank should be based on a measure of ANAGENSIS, not Cladogensis.
>
> That is, as Ken Kinman wants, we (Homo sapiens) could be placed in a
> separate phylum (Psychozoa Huxley) or at least a family on the basis of the
> greater divergence (supposedly in our intelligence) from all other animals.
>
> Yes, you are right. No one will accept any consistent, scientific standard
> for ranking monophyletic units in classification.
>
> So, the bottom line remains that Taxonomy will continue to be seen by
> others
> as not a SCIENCE.
>
> Oh, well ...
>
> Sincerely,
>
> Chris
>
> -----Original Message-----
> From: John Noyes
> Sent: Friday, October 04, 2013 4:39 AM
> To: 'Chris Thompson' ; Richard Jensen
> Cc: TAXACOM
> Subject: RE: [Taxacom] Biodiversity questions: Classifications
>
> Hi Chris,
>
> I completely agree with you.
>
> If not the age of the group, then how about standardising it as a
> theoretical average number of generations per species, or some sort of
> index
> of hypothetical generation time, or index of generation time x genetic
> plasticity, or generation time x genetic plasticity + perceived rate of
> extinction, or . . . .
>
> My brain hurts.
>
> John
>
> John Noyes
> Scientific Associate
> Department of Life Sciences
> Natural History Museum
> Cromwell Road
> South Kensington
> London SW7 5BD
> UK
> jsn at nhm.ac.uk
> Tel.: +44 (0) 207 942 5594
> Fax.: +44 (0) 207 942 5229
>
> Universal Chalcidoidea Database (everything you wanted to know about
> chalcidoids and more):
> www.nhm.ac.uk/chalcidoids
>
>
> -----Original Message-----
> From: taxacom-bounces at mailman.nhm.ku.edu
> [mailto:taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of Chris Thompson
> Sent: 03 October 2013 19:04
> To: Richard Jensen
> Cc: TAXACOM
> Subject: Re: [Taxacom] Biodiversity questions: Classifications
>
> Sorry, Dick,
>
> Yes, for different questions, we as scientists may use different measures,
> etc.
>
> HOWEVER, it the case of your example, age-based ranked groups are also
> useful. For CURRENT biodiversity one would declare that family x with 999
> surviving species is a highly successful clade, where as family z with only
> a single surviving species is NOT.
>
>
> Real example, horse-shoe crabs versus insects!
>
> Oh, well ...
>
> From: Richard Jensen
> Sent: Thursday, October 03, 2013 12:28 PM
> To: Chris Thompson
> Cc: muscapaul ; TAXACOM
> Subject: Re: [Taxacom] Biodiversity questions: Classifications
>
> Could it be that the apparent discrepancy in biodiversity, as we perceive
> it, is that family Z has had just as many speciation events as family X,
> but
> has experienced extremely high rates of extinction? If so, then knowing
> the
> age tells us nothing about biodiversity - the two clades, one with 999
> surviving species, and one with 1 surviving species, could be the same age.
>
>
> Dick J
>
>
>
>
> On Thu, Oct 3, 2013 at 11:15 AM, Chris Thompson <xelaalex at cox.net> wrote:
>
> PAUL:
>
> The scientific question that we begin with was about biodiversity.
>
> And Hennig said to answer those kinds of questions, then groups based on
> time are the best.
>
> So, under the Hennig system, one could say that family X which now
> contains
> 999 species is more biodiversity, has more speciation, etc., than family
> Z
> which now contains only 1 species. BECAUSE the contents (species) of each
> family represents a clade that has evolved over the SAME time period.
>
> But as I indicated in my Diptera example, comparison of the number of
> species in Limoniidae versus Inbiomyiidae does not tell you anything
> about
> biodiversity, speciation, etc. because those groups are not equivalent,
> not
> comparable, etc.
>
> Oh, well ...
>
> Sincerely,
>
> Chris
>
> -----Original Message-----
> From: muscapaul
> Sent: Thursday, October 03, 2013 10:27 AM
> To: TAXACOM
> Subject: Re: [Taxacom] Biodiversity questions: Classifications
>
> Just out of interest: If actual age would (should?) be playing a role,
> where do we then account for differences between taxa with highly
> divergent
> generation time, like drosophilids with perhaps more than 10 generations
> per year under favourable conditions and panthophthalmids which probably
> take multiple years to develop? And then I am just considering taxa
> within
> the same order where one might give rise to new taxa on a much shorter
> absolute time scale than the other.
>
> Paul
>
> On 3 October 2013 12:59, Chris Thompson <xelaalex at cox.net> wrote:
>
> > So, for example, in Diptera, we now recognize a family which is a clade
> of
> > some 10 thousand species and of some 200 million years old (Limoniidae)
> > and
> > another family of less than a dozen species and probably less than 5
> > million
> > years old (Inbiomyiidae).
>
> ...
> >
> > So, if one wants to derived scientific hypotheses from classifications,
> > one
> > must go back to clades and their age.
> >
> > Sincerely,
> >
> > Chris
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> --
>
> Richard Jensen, Professor
>
> Department of Biology
>
> Saint Mary's College
>
> Notre Dame, IN 46556
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--
___________________
Daniel J. G. Lahr, PhD
Assist. Prof., Dept of Zoology,
Univ. of Sao Paulo, Brazil
+ 55 (11) 3091 0948
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