Data/hora: 01/06/2024 16:27:05

Provedor de dados: | 27
País: | Belgium
Título: | Etude des migrations nycthémérales du zooplankton dans un milieu marin peu profond
Autores: | Daro, M.H.
Data: | 1974
Ano: | 1974
Palavras-chave: | Migrations Nyctimeral rhythms Shallow water Zooplankton ANE; Belgium; Oostende; Sluice Dock.
Resumo: | The Sluice-dock of Ostend, a shallow (1.5 m) marine biotope of 86 ha stays closed during some 6-7 months of the year and is not influenced by the tides. During 24 h cycles the nycthemeral migrations of the zooplankton at 5 depths in a watercolumn of 1 meter were studied in relation to several environmental factors: water temperature, dissolved oxygen, pH and chlorophyll content. The photosynthesis shows a minimum during the night and shows a maximum during the late afternoon, at which time the water-temperature is also maximal. Holo- and meroplanktonic organisms migrate towards the surface around 3-5 o'clock a.m., at which time the chlorophyll content is minimal, hence our hypothesis of nocturnal grazing, this phenomenon perhaps combined with a nocturnal division of phytoplankton cells. Each observed species has its own characteristic behaviour in relation to its negative diurnal phototropism and its own diurnal bottomward migration speed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Francês
Identificador: | http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3483
Fonte: | %3Ci%3EHydrobiologia+44%281-2%29%3C%2Fi%3E%3A+149-160
Fonte: | info:eu-repo/semantics/restrictedAccess