Marine Protostome Facility (Hausen and Hejnol)
The Hejnol group cultures and maintains a broad range of animal taxa. Currently the acoels Convolutriloba macropyga, Isodiametra pulchra, the polychaete Dinophilus gyrociliatus, the nemerteans Lineus viridis and Lineus longissimus, the polyclad flatworm Prostheceraeus vittatus, and the ctenophore Mnemiopsis leidyi are maintained. Food items are the copepod Acartia tonsa, and the algae Nitzschia, and Rhinomonas reticulate. The facility consists of two large incubators, one 500 liter seawater aquarium system, five Mnemiopsis 45 liter tanks and two 45 liters tanks containing Acartia. The animals are used for studying the evolution of animal diversity by using morphological and molecular methods. The following equipment is used for keeping the animals:
Incubator 1: Used for raising the cultures of Isodiametra, Dinophilus and Nitzschia. Set temperature of 20.4°C and a day/night cycle from 8-22.
Incubator 2: Used for raising the cultures of Prostheceraeus and Lineus. Set temperature of 10.4°C and a day/night cycle from 8-21.
The aquarium system for the Convolutriloba culture has a temperature of 22.5°C and a day/night cycle from 7-22.
The Mnemiopsis and copepod tanks stand at room temperature (22°C ). The copepod tanks stand in small light tents with a day/night cycle from 7-21. The Mnemiopsis have a day/night cycle from 8-19.
The Hausen group maintains cultures of several annelids throughout lifecycle (Platynereis dumerilii, Capitella teleta and Malacoceros fuliginosus) and keeps further organisms in tanks for seasonal breeding of embryos (like the chiton Leptochiton asellus, the annelid Owenia fusiformis and the bryozoan Bugula neritina).
The Platynereis culture runs in a seperate room under strict day/night and lunar cycle illumination regime. The animals are kept in 2l boxes and are fed mainly with spinach. Most other organisms are maintained in standard 80 liter aquaria tanks.
Cultures of the algae Isochrysis and Tetraselmis as well as yeast and Liquifry is used for feeding larvae and small juveniles. Grinded fish food is supplied to cultures of surface deposit and sediment feeders.
All embryos are raised in incubators with precise temperature control facilitating exact staging of the developing larvae for various kinds of molecular and structural studies.
Inside the Facility