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Pirow R, Wollinger F, Paul RJ. The sites of respiratory gas exchange in the planktonic crustacean daphnia magna: an in vivo study employing blood haemoglobin as an internal oxygen probe. J Exp Biol 1999; 202 Pt 22:3089-99. [PMID: 10539957 DOI: 10.1242/jeb.202.22.3089] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Recent studies on Daphnia magna have revealed that the feeding current is important for uptake of oxygen from the ambient medium. Respiratory gas exchange should therefore mainly occur within the filtering chamber, whose boundaries are formed by the trunk and the extended carapace shell valves. The precise site of gas exchange in the genus Daphnia is, however, a matter of conjecture. We have developed a method of imaging the haemoglobin oxygen-saturation in the circulatory system of transparent animals, which provides an opportunity to localize oxygen uptake from the environment and oxygen release to the tissues. Experiments were carried out at 20 degrees C on 2.8-3.0 mm long parthenogenetic females maintained in hypoxic culturing conditions, which had resulted in an increased haemoglobin content in the haemolymph. In lateral views of D. magna, the highest values of haemoglobin oxygen-saturation occurred near the posterior margin of the carapace and, surprisingly, in the rostral part of the head. The ambient oxygen partial pressures at which haemoglobin was half-oxygenated were 15 mmHg (2.0 kPa) for the posterior carapace region and 6 mmHg (0.8 kPa) for the rostrum. Although not all parts of the circulatory system could be analyzed using this technique, the data obtained from the accessible regions suggest that the inner wall of the carapace is a major site of respiratory gas exchange. Taking the circulatory pattern and the flow pattern of the medium in the filtering chamber into consideration, it becomes clear that the haemolymph, after passing from the limbs to the carapace lacuna, becomes oxygenated while flowing through the ventral part of the double-walled carapace in a posterior direction. The laterally flattened rostral region, where sensory and central nervous system structures are located, seems to have direct diffusive access to ambient oxygen, which could be especially advantageous during severe hypoxia when the convective transport systems fail to supply enough oxygen to that region.
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Affiliation(s)
- R Pirow
- Institut fur Zoophysiologie, Universitat Munster, Hindenburgplatz 55, Germany.
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Stobbart R, Keating J, Earl R. A study of sodium uptake by the water flea Daphnia magna. ACTA ACUST UNITED AC 1977. [DOI: 10.1016/0300-9629(77)90387-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Copeland DE. A study of salt secreting cells in the brine shrimp (Artemia salina). PROTOPLASMA 1967; 63:363-384. [PMID: 6081635 DOI: 10.1007/bf01252946] [Citation(s) in RCA: 54] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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ALLANSON BR, KRIJGSMAN BJ. Accumulation of silver in the gills of Potamon perlatus (M. Edw.) in relation to osmoregulation. ARCHIVES INTERNATIONALES DE PHYSIOLOGIE ET DE BIOCHIMIE 1957; 65:379-90. [PMID: 13471098 DOI: 10.3109/13813455709069422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Dejdar E, Gicklhorn J. Neue untersuchungen zum nachweis der funktion des nackenschildes der cladoceren als atmungsorgan. ZOOMORPHOLOGY 1932. [DOI: 10.1007/bf00446390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gicklhorn J. Entwicklung und gegenwärtiger Stand einiger Probleme und Ziele der Vitalfärbung. Rev Physiol Biochem Pharmacol 1931. [DOI: 10.1007/bf02322403] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kedrowsky B. Die Stoffaufnahme bei Opalina Ranarum. Mitteilung III. Aufnahme und Speicherung von Farbstoffen. Cell Tissue Res 1931. [DOI: 10.1007/bf02450838] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Das verschiedene verhalten der k�rpersegmente von cyclops strenuus fischer bei vitaler f�rbung und behandlung mit leicht reduzierbaren metallsalzen. ZOOMORPHOLOGY 1931. [DOI: 10.1007/bf00446354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Die funktion der ?blattf�rmigen anh�nge? der embryonen von asellus aquaticus (L.). (versuch einer analyse mit hilfe vitaler elektivf�rbung). ZOOMORPHOLOGY 1930. [DOI: 10.1007/bf00439430] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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