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POPULATION, BIOLOGY & GENETICS
GENETIC VARIATION ANO GENETIC STRUCTURE
OF
NATURAL POPULATIONS
OF
GELlD/UM
SPECIES: A RE-EVALUATION
OF
RESULTS
P.A. Sosa
M.
Vale o2,
F.
Ba is a1 and M.A. González-Pé ez1
1 Depa amen o de Biología. Uni e sidad de Las Palmas de G an Cana ia. Campus Uni e si a io de Ta i a.
35017 Las Palmas. Cana y Islands. Spain. 2 Labo a oi e de Gene ique e E olu ion des Popula ions
Vege ales. Uni e si e de Lille
1.
URA CNRS 1185.Ba imen SN2. Lille. F ance.
A e-e alua ion
o
da a published by Sosa & Ga cia-Reina (1992, 1993) abou gene ic a ia ion and gene ic
di e en ia ion
o
Gelidium cana iensis and G. a buscula na u al popula ions ha e been ealized. Exac es s
o popula ion di e en ia ion among spo ophy es and game ophy es, es s o Ha dy-Weinbe g de ia ion,
analysis
o
geno ypic disequilib ium, and he F-S a is ics analysis we e pe o med o each a be e
unde s ood o he gene ic s uc u e o hese species. The new da a analyses con i m ha dispe sal is
es ic ed o e sho dis ances o he wo species. I con i ms also ha mean way
o
ep oduc ion is asexual
in
G. a buscula.
We
discuss how es ic ed gene low and clonal p opaga ion may explain he signi ican
di e ences be ween haploid and diploid allele equencies de ec ed o his species. Fo
G.
cana iensis he
spa ial sub-s uc u ing
is
su icien o explain de ia ion
in
allele equencies be ween haploid and diploid
indi iduals. Howe e , he e ec
o
asexual ep oduc ion
on
popula ion gene ic s uc u e could no
be
con i med. The impo ance o he sampling design
in
de e mining he le el and pa e n
o
gene ic
di e en ia ion wi hin a species
is
discussed. Compa isons
o
gene ic dis ances be ween and wi hin Gelidium
cana iensis and G. a buscula popula ions show ha di e ences be ween bo h species we e always g ea e
han hose be ween popula ions o he same species. These esul s p o e ha isozyme analysis
is
a use ul
ool o analyzing he gene ic s uc u e o na u al popula ions
in
seaweeds, and de ining species bounda ies
in
Gelidium.
This wo k has been ca ied ou om he collabo a ion su ged
in
ambi o he Eu opean Communi y p ojec
"BIOGAP". MAST-III p og amo
26