Skip to main content
main-content

Über dieses Buch

Whatever theory may be advanced to explain diurnal migration, the underlying reactions involved must be demonstrated conc- sively in the laboratory before the explanation can be ?nally accepted George L. Clarke 1933 p. 434 In oceans and lakes, zooplankton often make diel vertical migrations (DVM), descending at dawn and coming up again in late afternoon and evening. The small animals cover distances of 10–40 m in lakes or even a few hundred metres in the open oceans. Although not as spectacular as migrations of birds or the massive movements of large mammals over the African savannas, the numbers involved are very large and the biomass exceed the bulk of the African herds. For example, in the Antarctic oceans swarms of “Krill” may cover kilometres across, with thousands of individuals per cubic metre. These Euphausiids are food for whales, the most bulky animals on earth. Zooplankton are key species in the pelagic food web, intermediary between algae and ?sh, and thus essential for the functioning of the pelagic community. Prey for many, they have evolved diverse strategies of survival and DVM is the most imp- tant one. Most ?sh are visually hunting predators and need a high light intensity to detect the often transparent animals. By moving down, the well-lit surface layers are avoided but they have to come up again at night to feed on algae.

Inhaltsverzeichnis

Frontmatter

2010 | OriginalPaper | Buchkapitel

Chapter 1. Windows: An Introduction

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 2. Swimming in a Strange Biotope

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 3. Light-Induced, Reactive Swimming

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 4. A Decision-Making Mechanism

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 5. Mechanistic Models

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 6. Light and Temperature

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 7. Optical Orientations

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 8. Considerations Before Going into the Field

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 9. Diel Vertical Migration in Lakes

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 10. Migrations in the Marine Environment

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 11. The Confrontation of Experimental and Field Studies

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 12. From the Individual to the Population and Beyond

Joop Ringelberg

2010 | OriginalPaper | Buchkapitel

Chapter 13. Recapitulations and Considerations

Joop Ringelberg

Backmatter

Weitere Informationen

BranchenIndex Online

Die B2B-Firmensuche für Industrie und Wirtschaft: Kostenfrei in Firmenprofilen nach Lieferanten, Herstellern, Dienstleistern und Händlern recherchieren.

Whitepaper

- ANZEIGE -

Unsicherheitsabschätzung für die Berechnung von dynamischen Überschwemmungskarten – Fallstudie Kulmbach

Das vom BMBF geförderte Projekt FloodEvac hat zum Ziel, im Hochwasserfall räumliche und zeitliche Informationen der Hochwassergefährdung bereitzustellen. Im hier vorgestellten Teilprojekt werden Überschwemmungskarten zu Wassertiefen und Fließgeschwindigkeiten unter Angabe der Modellunsicherheiten berechnet.
Jetzt gratis downloaden!

Bildnachweise