Anaerobic metabolic strategy of the glacial relict isopod Saduria (Mesidotea) entomon

Hagerman, Lars; Szaniawska, Anna

doi:10.3354/meps059091

Cited by 45 publications

(15 citation statements)

References 7 publications

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“…This is associated with a concomitant increase in midgut gland copper concentration, although not all of the copper lost from the haemolymph is necessarily accommodated in the midgut gland (Depledge & Bjerregaard 1989). Other changes in starved benthic crustaceans maintained in hypoxic conditions include depletion of glycogen reserves (Hagerman & Szaniawska 1990), reduced locomotor activity and a marked rise in perfusion index ( Q / v~, ) consistent with reduced haemocyanin concentrations in haemolymph (Depledge 1985).…”

Section: Introductionmentioning

confidence: 99%

Glycogen depletion and altered copper and manganese handling in Nephrops norvegicus following starvation and exposure to hypoxia

Baden¹,

Depledge²,

Hagerman³

1994

Mar. Ecol. Prog. Ser.

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Nephrops norvegicus exposed to starvation and hypoxia in the field as well as in the laboratory exhibited marked differences in glycogen reserves, haemolymph haemocyanin concentrations, and tissue copper and manganese contents. Muscle glycogen concentration was reduced by ca 50% in lobsters collected from hypoxic field conhtions. Glycogen concentrations were reduced to ca 3 "/o of initial values in muscle and 10% in midgut gland following 7 mo starvation in the laboratory. Haemolymph haemocyanin concentration was markedly reduced in N. nowegicusexposed to severely hypoxic conditions although haemolymph copper concentration remained virtually unchanged. Starvation resulted in a slower reduction of haemocyanin concentration than was associated with hypoxia. Starvation resulted in a net loss of copper after 7 mo. Experimental exposures to moderate or severe hypoxia were not associated with net losses of copper, although in long-term moderate hypoxia the whole body copper load was redistributed, especially to the midgut gland increasing the concentration there 4 times. Redistribution of copper to the midgut gland did not occur in N. norvegicus exposed to severe hypoxia in the field. Threeto four-fold lower copper concentrations were found in the midgut glands of hypoxic lobsters (compared to controls from normoxic areas). As well as low copper concentrations, these lobsters had 2 to 4 times higher manganese concentrations in internal tissues. In the absence of sediment, manganese concentrations and contents were not influenced by laboratory exposure to hypoxia.

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Section: Introductionmentioning

confidence: 99%

Glycogen depletion and altered copper and manganese handling in Nephrops norvegicus following starvation and exposure to hypoxia

Baden¹,

Depledge²,

Hagerman³

1994

Mar. Ecol. Prog. Ser.

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“…The normoxic amino acids (especially glycine, proline and alanine) help to maintain the cellular osmotic pressure (Weber & van Marrewijk 1972) and haemolymph amino acids are also the products of protein turnover (Claybrook 1983). The anoxia-induced increase in haemolymph FAA is probably due to protein catabolism as anoxia is invariably associated with starvation and an accumulation of alanine as an anaerobic end product (Hagerman & Szaniawska 1990). Although haemocyanin is also broken down under anoxia it is unlikely to be a major contributor to the FAA build-up because it is not particularly rich in proline, glycine and alanine (Boone & Schoffeniels 1979).…”

Section: Discussionmentioning

confidence: 99%

“…This time is short compared with that for Nephrops norvegicus (Hosie et al 1991) but similar to that of Crangon crangon (Hunter & Uglow 1993b) which probably reflects the activity/metabolic level of the species. The combination of the lowered haemolymph ammonia levels and the decreased efflux rate found after 96 h anoxia indicates ammonia production inhibition and parallels the decrease in metabolic levels found in S. entomon under such anoxia (Hagerman & Szaniawska 1990). …”

Section: Discussionmentioning

confidence: 99%

“…The extent of its tolerance to periods of anoxia or to exposure of hydrogen sulphide whilst under anoxia is dependent on its activity pattern which determines whether the end product of the anaerobic metabolism will be lactate or alanine. Lactate accumulation relates to short-term survival whilst alanine accumulation leads to longterm survival under anoxia (Hagerman & Szaniawska 1990). In the presence of hydrogen sulphide, however, S. entomon invariably switches to anaerobiosis which also leads to lactate production -even if oxygen is present in amounts that normally permit the species to continue an aerobic metabolism (Hagerman & Vismann 1993).…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that increased production of uric acid (urate) occurs in Carcinus rnaenas and Callinectes sapidus when exposed to hypoxia (Lallier et al 1987, DeFur et al 1990). Furthermore, it has been shown that anaerobic metabolism can lead to increased haemolymph levels of amino acids, with alanine being predominant, in Saduria entornon (Hagerman & Szaniawska 1990).…”

Section: Introductionmentioning

confidence: 99%

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Haemolymph nitrogen compounds and ammonia efflux rates under anoxia in the brackish water isopod Saduria entomon

Hagerman¹,

Szaniawska²

1994

Mar. Ecol. Prog. Ser.

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Production and excretion of nitrogenous end products was studied in the benthic Baltic isopod Saduria entomon (L.) under normoxic and anoxic conditions. S. entomon is ammonotelic.Normoxic haemolymph ammonia concentrations were 176 + 53 (SD) pm01 NH.,; I-' decreasing with time to 50 pm01 NH,' 1-' after 120 h anoxia. Normoxic ammonia efflux rate was 0.53 i-0.07 (SD) pm01 NH,' g-' h-', decreasing 90% after 96 h anoxia. Normoxic haemolymph urate amounted to 135 pm01 I-', increasing after 120 h under anoxia to 741 + 79 (SD) pm01 l-' Haemolymph urate concentrations were relatively high because of the ammonia excretion and an undetectable urate excretion even under anoxia. Circulating free amino acids also increased progressively under anoxia, from the normoxic 28 to 165 mm01 1'' after 96 h anoxia. This increase was largely due to accumulation of alanine as a result of an anaerobic metabolism. Ammonia was calculated to be the quantitatively dominat~ng nitrogenous end product in S. entomon. An effective efflux of ammonia prevents an excessive build-up of toxic ammonia in the haemolymph.

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Possible effects of global environmental changes on Antarctic benthos: a synthesis across five major taxa

Ingels

Vanreusel

Brandt

et al. 2012

Ecology and Evolution

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Because of the unique conditions that exist around the Antarctic continent, Southern Ocean (SO) ecosystems are very susceptible to the growing impact of global climate change and other anthropogenic influences. Consequently, there is an urgent need to understand how SO marine life will cope with expected future changes in the environment. Studies of Antarctic organisms have shown that individual species and higher taxa display different degrees of sensitivity to environmental shifts, making it difficult to predict overall community or ecosystem responses. This emphasizes the need for an improved understanding of the Antarctic benthic ecosystem response to global climate change using a multitaxon approach with consideration of different levels of biological organization. Here, we provide a synthesis of the ability of five important Antarctic benthic taxa (Foraminifera, Nematoda, Amphipoda, Isopoda, and Echinoidea) to cope with changes in the environment (temperature, pH, ice cover, ice scouring, food quantity, and quality) that are linked to climatic changes. Responses from individual to the taxon-specific community level to these drivers will vary with taxon but will include local species extinctions, invasions of warmer-water species, shifts in diversity, dominance, and trophic group composition, all with likely consequences for ecosystem functioning. Limitations in our current knowledge and understanding of climate change effects on the different levels are discussed.

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Anaerobic metabolic strategy of the glacial relict isopod Saduria (Mesidotea) entomon

Cited by 45 publications

References 7 publications

Glycogen depletion and altered copper and manganese handling in Nephrops norvegicus following starvation and exposure to hypoxia

Glycogen depletion and altered copper and manganese handling in Nephrops norvegicus following starvation and exposure to hypoxia

Haemolymph nitrogen compounds and ammonia efflux rates under anoxia in the brackish water isopod Saduria entomon

Possible effects of global environmental changes on Antarctic benthos: a synthesis across five major taxa

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