The Plankton of the SeaAmerican Elsevier Publishing Company, 1966 - 426 pagine |
Dall'interno del libro
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Pagina 72
... polyp and a medusa generation . The polyp generations of both are static , living in colonies , the individuals of which branch off from a common stem so that the whole association looks more like a plant than a collection of animals ...
... polyp and a medusa generation . The polyp generations of both are static , living in colonies , the individuals of which branch off from a common stem so that the whole association looks more like a plant than a collection of animals ...
Pagina 73
... polyp can only bud fresh medusa - bearing polyps , the medusae give rise to eggs and sperm on different individuals and the fertilized eggs produce the planula larva already mentioned and which grows into the polyp generation again ...
... polyp can only bud fresh medusa - bearing polyps , the medusae give rise to eggs and sperm on different individuals and the fertilized eggs produce the planula larva already mentioned and which grows into the polyp generation again ...
Pagina 79
... polyp or hydroid person as against those who urge that the medusoid person was fundamental . In Velella , however , the late Professor Garstang has very reasonably argued the resemblance with the polyp head of Tubularia , and the case ...
... polyp or hydroid person as against those who urge that the medusoid person was fundamental . In Velella , however , the late Professor Garstang has very reasonably argued the resemblance with the polyp head of Tubularia , and the case ...
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