From: Scott Chase (
Date: Fri Dec 14 2001 - 09:16:58 GMT

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    From: "Scott Chase" <>
    Subject: lineage
    Date: Fri, 14 Dec 2001 04:16:58 -0500
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    I may have gotten too anal about the use of lineage in a phylogenetic
    context. I was focusing on evolution as a *branching* process and I usually
    avoid thinking of linearity, but in some sense there's linear relations
    nonetheless. Both evolutionary biology texts I looked at use the term.
    Minkoff's _Evolutionary Biology_ defines lineage as: "(a) linear succession
    of species arranged in a sequence from ancestor to descendant" where
    Futuyma's _Evolutionary Biology_ defines it as "(a) series of ancestral and
    descendant populations, through time; usually refers to a single evolving
    species, but may include several species descended from a common ancestor".

    My main beef would probably be, if I remember Gould's _Full House_ aright,
    with a singular focus on one pathway as *the* lineage, such as if one traced
    microbe to man and ignored the rest, which gives us that favored axis
    treatment which IIRC corresponds to Teilhard's emphasis. There may be lines,
    but they do lots of splitting (cladogenesis).

    If the relation in sexual species between parents and child is a T (I said Y
    before), can this result in a lineage applied at this lower level?

    When abstracted to populations and considering ancestral/descendant
    relations the lineage term begrudgingly applies, though I wince at applying
    something with linear connotations to a branching process like evolution
    because historic linear and serial confusions there have been which grossly
    misrepresent evolution.

    I've probably made tons of goofs, but this will give Wilkins practice for
    his orals.


    Futuyma DJ. 1998. Evolutionary Biology. Sinauer Associates, Inc. Sunderland,

    Minkoff EC. 1984. Evolutionary Biology. Addison-Wesley Publishing Company.
    Reading, Massachusetts

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