A preliminary investigation into the oxygen-combining properties of pogonophore haemoglobin

Multiple Haemoglobins of the Bivalve Mollusc Anadara Trapezia

“…It was suggested by Riggs (1970Riggs ( , 1979 that the possession of multiple haemoglobins conferred a selective advantage on an animal species, and throughout the lower vertebrate and invertebrate groups it does seem a widespread mechanism of adaptation to variable environmental factors. Functional differences in mUltiple haemoglobins are well documented for fish haemoglobins (Riggs 1979) and have been demonstrated in haemoglobins from insects (Braun et al 1968), echinoderms (Bonaventura et al 1976), annelids (Seamonds and Forster 1972;Wells and Dales 1976), and molluscs (O'Gower and Nicol 1968;Collett and O'Gower 1972;Dixon 1976).…”

Multiple Haemoglobins of the Bivalve Mollusc Anadara Trapezia

“…It was suggested by Riggs (1970Riggs ( , 1979 that the possession of multiple haemoglobins conferred a selective advantage on an animal species, and throughout the lower vertebrate and invertebrate groups it does seem a widespread mechanism of adaptation to variable environmental factors. Functional differences in mUltiple haemoglobins are well documented for fish haemoglobins (Riggs 1979) and have been demonstrated in haemoglobins from insects (Braun et al 1968), echinoderms (Bonaventura et al 1976), annelids (Seamonds and Forster 1972;Wells and Dales 1976), and molluscs (O'Gower and Nicol 1968;Collett and O'Gower 1972;Dixon 1976).…”

Further experiments on the value of dissolved organic matter as food forSiboglinum fiordicum(Pogonophora)

“…This second hypothesis appears to be a distinct possibility: although Siboglinum does not irrigate its tube by sustained ciliary currents, the immediate vicinity of mud is often lighter coloured than the generally darker sub-surface mud. All pogonophores have blood very rich in haemoglobin, of a type adapted to carry oxygen at very low partial pressures (Wells & Dales, 1976), and some of the oxygen might diffuse out into the surrounding, nearly anoxic, mud. From the presence of large amounts of haemoglobin, and from the results of the in vitro experiments, it seems likely that the metabolism of 5. fiordicum is predominantly aerobic.…”

Studies on the haemoglobins of the small Pogonophora

“…The P 50 values range from 0-36 Torr for diluted blood of 5. fiordicum, through 0-5 Torr for undiluted blood of S. atlanticum to 0-5-1 0 Torr for undiluted blood of S.fiordicum. The substantially higher affinity (0086 Torr) reported by Wells & Dales (1976) indicate a greater degree of dissociation of the protein as a result of the more drastic preparation method (homogenization in a low pH phosphate buffer). A change in oxygen binding properties has been reported by Arp & Childress (1981) following dilution (0-4 g %) of the blood of Riftia pachyptila, the P 50 of which was reduced from 4-5 Torr to about 1 Torr.…”

Multiple Haemoglobins of the Bivalve Mollusc Anadara Trapezia

“…It was suggested by Riggs (1970Riggs ( , 1979 that the possession of multiple haemoglobins conferred a selective advantage on an animal species, and throughout the lower vertebrate and invertebrate groups it does seem a widespread mechanism of adaptation to variable environmental factors. Functional differences in mUltiple haemoglobins are well documented for fish haemoglobins (Riggs 1979) and have been demonstrated in haemoglobins from insects (Braun et al 1968), echinoderms (Bonaventura et al 1976), annelids (Seamonds and Forster 1972;Wells and Dales 1976), and molluscs (O'Gower and Nicol 1968;Collett and O'Gower 1972;Dixon 1976).…”

Further experiments on the value of dissolved organic matter as food forSiboglinum fiordicum(Pogonophora)

“…This second hypothesis appears to be a distinct possibility: although Siboglinum does not irrigate its tube by sustained ciliary currents, the immediate vicinity of mud is often lighter coloured than the generally darker sub-surface mud. All pogonophores have blood very rich in haemoglobin, of a type adapted to carry oxygen at very low partial pressures (Wells & Dales, 1976), and some of the oxygen might diffuse out into the surrounding, nearly anoxic, mud. From the presence of large amounts of haemoglobin, and from the results of the in vitro experiments, it seems likely that the metabolism of 5. fiordicum is predominantly aerobic.…”

Studies on the haemoglobins of the small Pogonophora

“…The P 50 values range from 0-36 Torr for diluted blood of 5. fiordicum, through 0-5 Torr for undiluted blood of S. atlanticum to 0-5-1 0 Torr for undiluted blood of S.fiordicum. The substantially higher affinity (0086 Torr) reported by Wells & Dales (1976) indicate a greater degree of dissociation of the protein as a result of the more drastic preparation method (homogenization in a low pH phosphate buffer). A change in oxygen binding properties has been reported by Arp & Childress (1981) following dilution (0-4 g %) of the blood of Riftia pachyptila, the P 50 of which was reduced from 4-5 Torr to about 1 Torr.…”

Multiple Haemoglobins of the Bivalve Mollusc Anadara Trapezia

“…It was suggested by Riggs (1970Riggs ( , 1979 that the possession of multiple haemoglobins conferred a selective advantage on an animal species, and throughout the lower vertebrate and invertebrate groups it does seem a widespread mechanism of adaptation to variable environmental factors. Functional differences in mUltiple haemoglobins are well documented for fish haemoglobins (Riggs 1979) and have been demonstrated in haemoglobins from insects (Braun et al 1968), echinoderms (Bonaventura et al 1976), annelids (Seamonds and Forster 1972;Wells and Dales 1976), and molluscs (O'Gower and Nicol 1968;Collett and O'Gower 1972;Dixon 1976).…”

Further experiments on the value of dissolved organic matter as food forSiboglinum fiordicum(Pogonophora)

“…This second hypothesis appears to be a distinct possibility: although Siboglinum does not irrigate its tube by sustained ciliary currents, the immediate vicinity of mud is often lighter coloured than the generally darker sub-surface mud. All pogonophores have blood very rich in haemoglobin, of a type adapted to carry oxygen at very low partial pressures (Wells & Dales, 1976), and some of the oxygen might diffuse out into the surrounding, nearly anoxic, mud. From the presence of large amounts of haemoglobin, and from the results of the in vitro experiments, it seems likely that the metabolism of 5. fiordicum is predominantly aerobic.…”

Studies on the haemoglobins of the small Pogonophora

“…The P 50 values range from 0-36 Torr for diluted blood of 5. fiordicum, through 0-5 Torr for undiluted blood of S. atlanticum to 0-5-1 0 Torr for undiluted blood of S.fiordicum. The substantially higher affinity (0086 Torr) reported by Wells & Dales (1976) indicate a greater degree of dissociation of the protein as a result of the more drastic preparation method (homogenization in a low pH phosphate buffer). A change in oxygen binding properties has been reported by Arp & Childress (1981) following dilution (0-4 g %) of the blood of Riftia pachyptila, the P 50 of which was reduced from 4-5 Torr to about 1 Torr.…”