(’rRCADIAN PERI0T)ICITIEH I N l’HYTOPI,AHKTON
327
and Oguri ( 1 $157) and commoiily niisintorpreted ; on the other hand,
vcbrticiil tnigixtion, i~ poorly tloarrmented phenomenon. In many
ccologicd r c w i i i d i ~)spw, so cilllcd “ diurnal ” variations, when
nicnt~ionrd, i\I*e not f i ~ r fro111 t)eing idvooated as II mCre component of
the noiso toget(Iinr with the experimental and distributional errors.
Nevt*rtholcss, the recent ycarzn, have shown evidence of a renewed
interest on tlic 1)iir.t of p1iyto~~luiiktologists and ecophysiologisb in
%&how cyclcn, i ~ n d the libtest roviews on planktonic productivity
ticvoto one or t,wo pages to this rriatter (Stricklend, 1972; Platt and
HubbiL l t i q 1973).
This paper in an r~tteml)t--i~ppi~rontly the first one--to gather
togetlw iLII typw of circidisn vcLihtions it1 murinc phytopltmkton and
to sort oiit (vidimms, doubts and . g a p , referring as often i i ~
necessary
to laborator*y ciilturos and plimt physiology (hence a rather bulky
bi1)liogmphy) ; f’rcshwsbr populations will be considered occnsionally
without iiny prctjcnRion to complcteness. The wide field of phytoplwnktoii bioniiws and productivity will be explored in the followhg
srqiicnw : c c 4 l iiiiniber
a function of the division cycle ; cell number
ILS tt function of‘ v e r t i d migration and sinking ; cell content ; photos y i i tlicsis m d rcyirnt~ion ; nutricnt uptake ; physiological properties
other t h i i i i i i tritiontil ; environmentid factors. For convenience and
to avoid vxccssive sub-hcwlings, somo of these items will be split into
~ctverul yiltts.
11. Tirn (: ICNERITION Trnr E OF I’HYTOIT~AKKTON CELLS
A prolirninit.lay qu&ion hiis to be aetklccl : how long approximately
is the lifetime of (I piiytoylnnkton cell! This point haR boen briefly
revie\\wi by StrickltLncl ( 1 !Ma) rind Eppl(>y and rStrick1:intl ( 19W) ; it
will be dealt with’ herc i L t sonw lotigtli :mcl the diffi.rant approiwhofi
will bc diHt,inguished, going froni thc IrLborntory to the open sea.
A. ThP d d n
Jnformation from cultures of miwiiic phytoplankters is much too
vast to be cited cxtensivcly. Probably the following fiftecn rcfcrences
i w sufficient, to show that generation times in the laboratory range
from n few honrs to ii few days for a wide spectrum of organisms :
--diatoms (C’ui-I ctnd McLeod, 1961 ; Jmiskaya, 1963 ; Hellebust, 1966 ;
Vm1,sntlinghtim and Harms, 1!165 ; Thomas, 1966 ; I’sasche,
1968 ; Richintin and Rogem, 1969; Sninyda 1969; Werner,
1970) :
327
and Oguri ( 1 $157) and commoiily niisintorpreted ; on the other hand,
vcbrticiil tnigixtion, i~ poorly tloarrmented phenomenon. In many
ccologicd r c w i i i d i ~)spw, so cilllcd “ diurnal ” variations, when
nicnt~ionrd, i\I*e not f i ~ r fro111 t)eing idvooated as II mCre component of
the noiso toget(Iinr with the experimental and distributional errors.
Nevt*rtholcss, the recent ycarzn, have shown evidence of a renewed
interest on tlic 1)iir.t of p1iyto~~luiiktologists and ecophysiologisb in
%&how cyclcn, i ~ n d the libtest roviews on planktonic productivity
ticvoto one or t,wo pages to this rriatter (Stricklend, 1972; Platt and
HubbiL l t i q 1973).
This paper in an r~tteml)t--i~ppi~rontly the first one--to gather
togetlw iLII typw of circidisn vcLihtions it1 murinc phytopltmkton and
to sort oiit (vidimms, doubts and . g a p , referring as often i i ~
necessary
to laborator*y ciilturos and plimt physiology (hence a rather bulky
bi1)liogmphy) ; f’rcshwsbr populations will be considered occnsionally
without iiny prctjcnRion to complcteness. The wide field of phytoplwnktoii bioniiws and productivity will be explored in the followhg
srqiicnw : c c 4 l iiiiniber
a function of the division cycle ; cell number
ILS tt function of‘ v e r t i d migration and sinking ; cell content ; photos y i i tlicsis m d rcyirnt~ion ; nutricnt uptake ; physiological properties
other t h i i i i i i tritiontil ; environmentid factors. For convenience and
to avoid vxccssive sub-hcwlings, somo of these items will be split into
~ctverul yiltts.
11. Tirn (: ICNERITION Trnr E OF I’HYTOIT~AKKTON CELLS
A prolirninit.lay qu&ion hiis to be aetklccl : how long approximately
is the lifetime of (I piiytoylnnkton cell! This point haR boen briefly
revie\\wi by StrickltLncl ( 1 !Ma) rind Eppl(>y and rStrick1:intl ( 19W) ; it
will be dealt with’ herc i L t sonw lotigtli :mcl the diffi.rant approiwhofi
will bc diHt,inguished, going froni thc IrLborntory to the open sea.
A. ThP d d n
Jnformation from cultures of miwiiic phytoplankters is much too
vast to be cited cxtensivcly. Probably the following fiftecn rcfcrences
i w sufficient, to show that generation times in the laboratory range
from n few honrs to ii few days for a wide spectrum of organisms :
--diatoms (C’ui-I ctnd McLeod, 1961 ; Jmiskaya, 1963 ; Hellebust, 1966 ;
Vm1,sntlinghtim and Harms, 1!165 ; Thomas, 1966 ; I’sasche,
1968 ; Richintin and Rogem, 1969; Sninyda 1969; Werner,
1970) :