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oligotrophic
has a horny beak like a parrot. In males one of the arms, the hectocotylus,
can be specially adapted for fertilizing the female. Octopods are predators
mostly of crustaceans of which they crush the carapace with their beak.
Example: Octopus vulgaris, living along rocky coasts of southern Europe.
oesophagus ~esophagus.
offshore region starting from baseline seawards. ~coastline, legal aspects.
O-group (or O-group) a term used in connection with year classes, to refer to
the animals in their first year of life from the end of the egg stage onwards.
oil spills unfortunate but regular phenomena in the marine environment, due to
the release of oil from ships during tanker or platform accidents, or due to
the discharge of effluents during the cleaning of oil tanks. Oil spillage control is regulated by IMO (International Maritime Organization, London). Oil
spills are particularly hazardous to sea birds, since oil contamination destroys the natural protective grease system of their feathers so that they get
wet and die of cold. Oil spills can be treated with detergents, which disperse
and solubilize the hydrocarbons in the water, and facilitate their breakdown by
bacterial decomposition. Detergents, however, proved to be toxic and microbial degradation also occurs without detergents. Mechanical removal of the
spill seems to be better for the environment.
olfaction ~homing.
oligo- prefix meaning few.
Oligocene ~geological time scale.
Oligochaeta (oligochaetes, earthworms) class of the phylum Annelida or segmented worms. In contrast to the class Polychaeta, these annelids have a simple head
without appendages and the segments do not have a pair of fleshy appendages (parapodia). Besides, these segments have only a few or no chetae,hence
the name of the class. Another feature is the clitellum. This is a row of several segments, clearly marked by their different coloring and/or swollen nature,
which are active in the reproduction. Next to terrestrial forms like the common earthworms, and freshwater species (e.g., Tubifex) ca. 200 marine, most1y small species exist among a total of ca. 3000. They are mainly deposit feeders
and can reach high densities in shallow estuarine mud flats. They are all hermaphrodites; the eggs directly hatch into tiny images of adults.
oligotrophic ~eutrophic regions.
oligotrophic
has a horny beak like a parrot. In males one of the arms, the hectocotylus,
can be specially adapted for fertilizing the female. Octopods are predators
mostly of crustaceans of which they crush the carapace with their beak.
Example: Octopus vulgaris, living along rocky coasts of southern Europe.
oesophagus ~esophagus.
offshore region starting from baseline seawards. ~coastline, legal aspects.
O-group (or O-group) a term used in connection with year classes, to refer to
the animals in their first year of life from the end of the egg stage onwards.
oil spills unfortunate but regular phenomena in the marine environment, due to
the release of oil from ships during tanker or platform accidents, or due to
the discharge of effluents during the cleaning of oil tanks. Oil spillage control is regulated by IMO (International Maritime Organization, London). Oil
spills are particularly hazardous to sea birds, since oil contamination destroys the natural protective grease system of their feathers so that they get
wet and die of cold. Oil spills can be treated with detergents, which disperse
and solubilize the hydrocarbons in the water, and facilitate their breakdown by
bacterial decomposition. Detergents, however, proved to be toxic and microbial degradation also occurs without detergents. Mechanical removal of the
spill seems to be better for the environment.
olfaction ~homing.
oligo- prefix meaning few.
Oligocene ~geological time scale.
Oligochaeta (oligochaetes, earthworms) class of the phylum Annelida or segmented worms. In contrast to the class Polychaeta, these annelids have a simple head
without appendages and the segments do not have a pair of fleshy appendages (parapodia). Besides, these segments have only a few or no chetae,hence
the name of the class. Another feature is the clitellum. This is a row of several segments, clearly marked by their different coloring and/or swollen nature,
which are active in the reproduction. Next to terrestrial forms like the common earthworms, and freshwater species (e.g., Tubifex) ca. 200 marine, most1y small species exist among a total of ca. 3000. They are mainly deposit feeders
and can reach high densities in shallow estuarine mud flats. They are all hermaphrodites; the eggs directly hatch into tiny images of adults.
oligotrophic ~eutrophic regions.