Hydraulic based sampling equipment for under-ice fauna

Aarset, A. V.; Willumsen, F. V.

doi:10.3402/polar.v3i2.6957

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…Amphipods Gammarus wilkitzkii were collected in the Barents Sea, east of Svalbard at about 77" N and 28" E in May 1986 and at 7 f 0 N 30°E in May 1988. They were sampled from pockets in the multiyear ice-floes by using a diver-operated suction sampler (Aarset & Willumsen 1985). Salinity (S) of the collected seawater was 34 to 35%0, and the temperature was in the range -1 .?…”

Section: Methodsmentioning

confidence: 99%

Effects of osmotic stress on oxygen consumption and ammonia excretion of the Arctic sympagic amphipod Gammarus wilkitzkii

Aarset¹,

Aunaas²

1989

Mar. Ecol. Prog. Ser.

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Seawater salinity changes affected the metabolic rates of the sympagic (under-ice) amphipod Gammarus wilkitzkii from the Arctic. When amphipods were abruptly transferred from seawater of 35 'L to 5%. the rates of both standard specific oxygen consumption (2.31 f 0.89 p1 g-' dry wt min-') and ammonia excretion (0.97 2 0.17 yg-at. NH4-N g-l d. wt h-l) increased about 3 times during the first hours of the exposure and remained hlgh throughout the rest of the experimental period (72 h). However, metabolic rates appeared to be less sensitive to 24 h osmotic stress in the salinity range 25 to 48%. compared to exposures of 15 and 5 %. The 0 :N atomic ratio of about 21 was constant during hyposmotic stress, indicating protein/lipids as metabolic substrate. Rates of oxygen consumption and ammonia excretion both increased with increasing osmotic difference (0 to 450 mOsm) between the haemolymph and the medium, indicating higher energy requirements for osmotic and ionic regulation at low salinities. A minor decrease in haemolymph sodium concentrations in amphipods exposed abruptly to 5%" coincided with an increased ammonia output during hyposmotic stress, indicating possible counter-ion regulation of NH,' and Na+.

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Section: Methodsmentioning

confidence: 99%

Effects of osmotic stress on oxygen consumption and ammonia excretion of the Arctic sympagic amphipod Gammarus wilkitzkii

Aarset¹,

Aunaas²

1989

Mar. Ecol. Prog. Ser.

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“…They were sampled from pockets in the multiyear ice-floes using a diver operated suction sampler (Aarset and Willumsen 1985). The salinity of the collected seawater was about 34 to 35 ppt and the temperature within the range -1.7 °C to -0.5 °C.…”

Section: Amphipodsmentioning

confidence: 99%

Influence of environmental salinity on oxygen consumption and ammonia excretion of the arctic under-ice amphipodOnisimus glacialis

Aarset¹,

Aunaas²

1990

Mar. Biol.

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Abstract. Changes in salinity affect the metabolic rate of the sympagic amphipod Onisimus glacialis collected from the Barents Sea in 1986 and 1988. When transferred from 35 to 5 ppt S, oxygen consumption and ammonia excretion both increase three-fold during the first 5 h of exposure, and they remain high throughout the rest of the experimental period (26 h). During 24-h acclimation to various salinities (5 to 45 ppt), the amphipods exhibit a respiratory and excretory response to hyper-and hypoosmotic stress; however, a rather constant O:N atomic ratio (around 15) was obtained at the experimental salinities, indicating protein/lipids as metabolic substrate. Both rates of oxygen consumption and ammonia excretion increased with an increasing osmotic difference (0 to 650 mOsm) between the haemolymph and the environmental medium, indicating higher energy requirements for osmotic and ionic regulation at low salinities. In amphipods abruptly transferred from 35 to 5 ppt, a minor decrease of the haemolymph sodium concentrations together with an increased ammonia excretion output indicate a counter-ion regulation of NH~ and Na + during hyposmotic stress.

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“…1). Individuals of both species were sampled from pockets in the multiyear ice floes by using a diver-operated suction sampler (Aarset and Willumsen 1985). The specimens were sampled from localities with seawater salinity of 34 to 35%0 and temperatures from -1.7 ° to -0.5°C.…”

Section: Specimensmentioning

confidence: 99%

Metabolic responses of the sympagic amphipodsGammarus wilkitzkii andOnisimus glacialis to acute temperature variations

Aarset¹,

Aunaas²

1990

Mar. Biol.

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Abstract. Acutely elevated seawater temperatures had pronounced metabolic effect on the Arctic under-ice amphipods Gammarus wilkitzkii and Onisimus glacialis, collected in May 1986 and1988 in the Barents Sea. An increased rate of oxygen consumption vs temperature was observed for both species. In the range from 0 ° to 10 °C G. wilkitzkii and O. glacialis exhibit Qto values of 3.4 and 3.6, respectively. The results also indicate increased ammonia excretion rates for G. wilkitzkii and O. glacialis by an elevation of temperature from 0 ° to 10°C, with an overall Qt0 of 1.9 and 2.3, respectively. The present study demonstrates an increased O : N ratio with ambient temperature elevation from 0 ° to 10 °C for G. wilkitzkii and O. glacialis, with overall Q~o values of 2.0 and 1.6, respectively. This indicates a temperature-induced change in the metabolic substrate towards lipids.

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Hydraulic based sampling equipment for under-ice fauna

Cited by 8 publications

References 3 publications

Effects of osmotic stress on oxygen consumption and ammonia excretion of the Arctic sympagic amphipod Gammarus wilkitzkii

Effects of osmotic stress on oxygen consumption and ammonia excretion of the Arctic sympagic amphipod Gammarus wilkitzkii

Influence of environmental salinity on oxygen consumption and ammonia excretion of the arctic under-ice amphipodOnisimus glacialis

Metabolic responses of the sympagic amphipodsGammarus wilkitzkii andOnisimus glacialis to acute temperature variations

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