Unknown
Cushman Foundation for Foraminiferal Research
In:
The Journal of Foraminiferal Research, 1 (1). pp. 20-28.
Publication Date:
2016-03-22
Description:
The foraminifer Rosulina globularis d'Orbigny from
natural and laboratory populations is occasionally
preyed upon by free-living, marine nematodes. Borings
3.7 to 14.3 in diameter in the tests of living and dead
specimens of R. globularis and dead specimens of Eolivina
doniezi Cushman and Wickenden from the same
natural and laboratory populations are attributed to the
predaceous nematodes. Predation in the laboratory populations
is greater than in the natural populations,
especially among juvenile specimens of R. globuluris.
Borings in R. globuluris occur characteristically in the
outer whorl, whereas, those in B. doniezi are generally
confined to the apertural half of the test. This preference
for the area of wall penetration is thought to correspond
to the accessibility or living position of the prey. However,
several incomplete borings coincide with test pores,
and thus represent test penetration in an area of least
resistance.
Identical borings occur in Holocene and Cretaceous
bathyal and neritic foraminifers. Another kind of borings
in these specimens, while in part resembling gastropod
boreholes, may likewise be due to soft-bodied organisms.
Evidence of predation provides ecologic and paleoecologic
information on the living habits, habitat, and
community structure of the foraminiferal prey, and can
directly influence the interpretation of foraminiferal production
and rates of sedimentation based on foraminiferal
production.
Type:
Article
,
PeerReviewed
Format:
text
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