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The beating heart of Daphnia under the microscope. The body of a Daphnia species is usually 1–5 mm (0.039–0.197 in) long, [2] and is divided into segments, although this division is not visible. [3] The head is fused, and is generally bent down towards the body with a visible notch separating the two.
Daphnia lumholtzi is typically found in the warm, shallow regions [6] of bodies of water with larger surface areas. [7] While most species of Daphnia see high mortality at temperatures greater than 25 °C, [8] D. lumholtzi individuals can survive and reproduce at temperatures up to 30 °C, [8] [9] [10] with a thermal optimum occurring at 29 °C. [9]
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 ]
Daphnia pulex. The genus Daphnia (Crustacea: Cladocera: Daphniidae) contains over 200 species of water fleas, many of which are in need of further taxonomic investigation (species inquirendae; marked with asterisks). [1]
Daphnia have a compound eye, and they are known to have an optomotor response. [12] D. pulicaria generally have a body length less than 3mm. [3] Because of the clear carapace of Daphnia, it is possible to see the heart and digestive tract, which often appears to be green due to the consumption of algae. [11]
Date/Time Thumbnail Dimensions User Comment; current: 09:01, 4 January 2010: 952 × 1,431, 18 pages (4.8 MB): Ayacop {{Information |Description={{en|1=original paper resulting in Henry's law, one of the gas laws}} |Source=William Henry: ''Experiments on the Quantity of Gases Absorbed by Water, at Different Temperatures, and under Different Pressures'' Phil. Trans. R.
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.
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 ...