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Daphnia magna is a typical water flea of the genus Daphnia. The females reach up to 5 mm in size, the males about 2 mm, thus they are among the largest species in the genus. [ 2 ] The body is protected by a translucent carapace made of chitin , a transparent polysaccharide. [ 3 ]
This difference in temperatures can be observed in different seasons and can lead to a high amount of variability between Daphnia, a crucial part of its ability to coevolve with P. ramosa. During P. ramosa infection, the size of the Daphnia increases significantly. This phenomenon is known as pathogen-induced gigantism. In addition, the ...
Daphnia is a genus of small planktonic crustaceans, 0.2–6.0 mm (0.01–0.24 in) in length. Daphnia are members of the order Anomopoda, and are one of the several small aquatic crustaceans commonly called water fleas because their saltatory swimming style resembles the movements of fleas.
The unicellular parasites infect the crustacean Daphnia magna. Both species H. magnivora and H. tvaerminnensis infect the fat body, the hypodermis and the ovaries of the crustacean. [5] [10] Infection can be detected by examining crushed animals under a phase contrast microscope (400x).
English: Schematic representation of cyclic parthenogenesis in the cladoceran Daphnia magna (water flea). In this reproductive system, individuals can alternate between sexual and parthenogenetic reproduction.
Daphnia_Heartbeat.ogv (Ogg Theora video file, length 45 s, 640 × 480 pixels, 593 kbps, file size: 3.22 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
The experiments start with a dog's heart, attached to a set of tubes to serve as substitutes for the great vessels. Using a system to supply it with blood, the heart beats in the same manner as if it were inside a living organism. The film then shows a lung in a tray, which is operated by bellows that oxygenate the blood being sent to the heart.
By adding the fluid surrounding the first heart to the second heart, he caused the heart rate of the second heart to slow down. This proved that stimulation of the vagus nerve caused the release of a substance which acted upon the heart tissue and directly caused the heart rate to slow down. (Figure 2) This substance was called vagusstoff.