Pasteuria ramosa

Summary[edit] Description: English: Two female Daphnia longispina. The left female is infected with Pasteuria ramosa. The animals are about 2.5 mm long. The animals were caught in a rock pool on a Skerry island in South-Western Finland. Date: 15 August 2014. Source: Own work. Author: Dieter Ebert, Basel, Switzerland.

Summary[edit] Description: English: Endospores of P. ramosa. Date: 16 March 2016. Source: Own work. Author: MPaljakka.

Summary[edit] Description: English: Female Daphnia magna infected with the bacterial parasite Pasteuria ramosa. The yellow mass in the body of the host are the endospores of the parasites. Date: 2 October 1994. Source: Own work. Author: Dieter Ebert, Basel, Switzerland.

Summary[edit] Description: English: Daphnia magna infected with Pasteuria ramosa. Date: 7 March 2016. Source: Own work. Author: MPaljakka.

Summary[edit] Description: English: “The picture shows Daphnia magna, the largest representative of the genus Daphnia, small freshwater crustaceans (also known as water fleas), which are among the oldest model systems in biological research. Like any other organism, D. magna are constantly challenged by microorganisms trying to invade their body. One of these villains is Pasteuria ramosa, a bacterial parasite castrating its host after successful establishment. The comparison of a healthy (left) and a heavily infected (right, 30 days post infection) female under a stereomicroscope reveals the consequences of parasite invasion: while the uninfected animal holds developing neonates in its brood chamber, this chamber is empty in the infected animal. Note also, that the hemolymph of the infected female is filled with P. ramosa endospores, the transmission stages, hence the opaque instead of translucent appearance of infected compared to healthy females. After the death of the host, these spores will be released from the carcass and consequently be ingested by new hosts, completing the horizontal transmission and starting a new life cycle of P. ramosa.”. Date: 29 August 2014. Source: BMC Ecology image competition 2014: the winning images. BMC Ecology 2014, 14:24 doi:10.1186/s12898-014-0024-6. Author: Nina Schlotz (University of Konstanz).

Summary[edit] Description: English: Spores of the bacterial endoparasite Pasteuria ramosa as seen with phase-contrast microscopy. The mature spores (light color) are about 5.5 µm in diameter. Earlier spore stages (grape-seed stage) are smaller. The host is Daphnia magna. Date: 10 June 2004. Source: Own work. Author: Dieter Ebert, Basel, Switzerland.