Recent assemblages from the water column have been
used in biogeographic surveys and as tracers of currents
and water masses (e.g., Boltovskoy and Wright, 1976).
Paleoceanographic studies with Foraminifera are based
on several approaches (see “Paleoceanography” and
“Paleoceanographic Proxies”). Past changes in the proportions of species as compared with present-day specific
makeups (usually aided by more or less complex mathematical manipulations of the data, like the transfer function techniques proposed by Imbrie and Kipp (1971))
allow reconstructing past ecological and oceanographic
settings (temperature, fronts, primary productivity; e.g.,
CLIMAP (1976)). Downcore changes in the relationship
between right-coiling versus left-coiling specimens of
some species (e.g., Neogloboquadrina pachyderma,
whose proportions of right-coiling individuals increase
with increasing temperature) have been used to reconstruct the water temperature at which these foraminifers
lived. Right- versus left-coiling ratios, however, may also
depend on other conditions (e.g., Thiede, 1971; Bolli
et al., 1985). Stable isotopes of oxygen and carbon in foraminiferal tests are also used to determine shifts in the temperature, salinity, oxygen content, and fertility of the
ocean over the past hundreds to millions of years (see
Rohling and Cooke, 2003, for a review) (see “Carbon
Isotopes” and “Oxygen Isotopes”).
Conclusions
Planktonic foraminifers are among the most important
marine microfossils. Their widespread occurrence and
high abundances, their excellent stratigraphic record,
and the comparatively good knowledge of their biology
and ecology make them excellent tools for stratigraphic,
paleoecologic, and biogeographic work. Their limited
diversity and relatively stable taxonomy have been major
advantages for their use as proxies of present and past
oceanographic settings as well as for tackling distributional and evolutionary problems. However, recent
changes in our understanding of the taxonomy of planktonic foraminifers brought about by molecular studies
pose new challenges for the use of these protists in applied
surveys.
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