Wjs. Currie et al., GAPS AND PATCHES IN THE OCEAN - A ONE-DIMENSIONAL ANALYSIS OF PLANKTONIC DISTRIBUTIONS, Marine ecology. Progress series, 171, 1998, pp. 15-21
The Optical Plankton Counter (OPC] was used to count individual animal
s in situ, and to produce a one-dimensional spatial-series from which
gap relationships could be quantified at the millimeter scale and abov
e, using a Distance to Next Encounter (DNE) technique. Both DNE and on
e-dimensional neighbor analyses indicated that zooplankton distributio
ns in all transects were significantly (p < 0.0001) aggregated into pa
tches. Within patches, zooplankton were effectively (r(2) approximate
to 0.94) randomly distributed, resulting in important implications for
some of the newer foraging models concerning zooplankton. The DNE fre
quency distributions all exhibited a distinct pattern that would not b
e expected from single Poisson distribution, indicating patchiness at
the meter scale. This allowed calculation of various statistics used t
o describe in situ patchiness such as: relative percentage of a transe
ct occupied by patches (79 to 89 %) and gaps, estimates of patch size
(similar to 2 m diameter), and patch densities (7000 to 14 000 organis
ms m(-3)).