The Plankton of the SeaAmerican Elsevier Publishing Company, 1966 - 426 pagine |
Dall'interno del libro
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Pagina 72
... medusa forms occur in the life - histories in varying and sometimes in equal and alternating importance . For instance , in the Hydrozoa there may be only a polyp stage , only a medusa stage , or they may alternate , whereas in the ...
... medusa forms occur in the life - histories in varying and sometimes in equal and alternating importance . For instance , in the Hydrozoa there may be only a polyp stage , only a medusa stage , or they may alternate , whereas in the ...
Pagina 73
... medusa buds , either singly or in numbers on a sort of mouthless , tentacle - like polyp , arise from different parts of the stalk or stolon . The medusae which have already been described are attached to their parent ' tree ' by the ...
... medusa buds , either singly or in numbers on a sort of mouthless , tentacle - like polyp , arise from different parts of the stalk or stolon . The medusae which have already been described are attached to their parent ' tree ' by the ...
Pagina 75
... medusa from the asexual Calyptoblastan polyp and the development of the latter from the egg produced by the medusa . The medusa is about 5 mm . in diameter Figure 15. The Anthomedusan Bou- gainvillea ramosa ( Van Beneden ) arising from ...
... medusa from the asexual Calyptoblastan polyp and the development of the latter from the egg produced by the medusa . The medusa is about 5 mm . in diameter Figure 15. The Anthomedusan Bou- gainvillea ramosa ( Van Beneden ) arising from ...
Sommario
PREFACE page | 13 |
INTRODUCTION | 17 |
THE FIELDS of the Sea | 43 |
Copyright | |
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adult Algae algal amphipod Antapical Antarctic Appendicularia Arctic arrow worm auxospore Biddulphia biol Biological body bottom Calanus Calanus finmarchicus called carbon cells Ceratium Chaetoceros Chaetognatha ciliated Cleve coast coastal copepods Coscinodiscus Crustacea deep water depth diameter diatoms distribution Dorsal eggs Ehbg elegans euphausid Expedition female Figure fish Fisheries flagellated floating G. O. Sars genera genus gonozooid growth Grun hauled Hensen individuals jelly-fish Laboratory larva latitudes latter layer light living lower marine medusa mentioned mouth Mysidae neritic North Atlantic North Sea Norwegian Sea number of species nutrients occur oceanic organic matter oxygen parasite pelagic peridinians Peridinium photophores photosynthesis phyto phytoplankton plankton plankton organisms plants Plate polyp population produced Rhizosolenia round Sagitta samples Sars sea water seasonal segments shell shrimps spores stage standing crop stations Steemann Nielsen surface water swimming temperature thoracic Thysanoessa tion tropical tube Uropod Ventral vertical warmer zone zooplankton