SE
san oo,
POae
feet
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4
Pe Rongelap invertebrates showed levels of activity of from
| 307 to 10" ue/eg ori March 26, 1954, By late January 1955 the
jevels had sropped about two ordera of magnitude,
The almost
| ubiquitous: black sea cuounber, Holothuria atra, serves best to
exemplify the trend (Figure 6). Next best as indicators were
giant clans, Hppopis, and Teidacna:; lang hermit crab, Coencbits;
wae
wt
one
’
coconut crab, Birgus: corals: and spider anail, Pterocera.
we pays wen
Radioactivity was highest.ant‘the digedtive and exeretory organs,
: { macle.
¥
EET TSTOO OEApea
wee te
wo
intermediate din the integudentary organs and lewest in the
;
Actual values for theseiples are tabulated in the
‘appendix. The kidney of the gtigt olan (PigureA ie of special
interest because of ita high level:of activity and‘plow vate of
“f} decline. A graph of activity of thetissuesof Lendhermit
F crabs dollected at the move radioactive northern.Aslands in
ae , March and July 1954 and from a less radioactive.sodthern Leland
;
- in Jamiary 1955, shows the effect of geographical“diereronces in
radioadtivity upon the trend of decline, accentuating the slope
in the ‘Later period (Figure &). The spider snail wan similar
to the hermit crab in the level of activity of its tissues,
while the corals were about an order of magnitude lower,
Land Planta and Algae
- Tain.‘plantandaless.collectionsweve.made_atLabareds,
fo Kebelle, Lomuilal, GeJet)“and Hehgelep'teratid#, Most ofthe
adibie plants were collectedin December 1954 and January 1955
atRohgelap"talbnd,“phase weresobomity-Bgu
POPPED
SL
igh &