The influence of acclimation and substratum on the metabolism of the Antarctic amphipods Waldeckia obesa (Chevreux 1905) and Bovallia gigantea (Pfeffer 1888)

Chapelle, Gauthier; Peck, Lloyd S.

doi:10.1007/bf00239063

Cited by 50 publications

(31 citation statements)

References 38 publications

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“…Antarctic ectotherms have developed complex mechanisms to adjust physiological processes to stable water temperatures and salinity, mainly with a view to energy saving ROGERS et al, 2007), in spite of considerable interespecific differences between them (CHAPELLE; PECK, 1995;GOMES et al, 1995). Our data seem to fit these environmental aspects of stability.…”

Section: Discussionsupporting

confidence: 49%

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

et al. 2013

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A B S T R A C TChanges in environmental factors may deeply affect the energy budget of Antarctic organisms as many of them are stenothermal and/or stenohaline ectotherms. In this context, the aim of this study is to contribute to knowledge on variations in the energy demand of the Antarctic amphipod, Gondogeneia antarctica as a function of temperature and salinity. Experiments were held at the Brazilian Antarctic Station "Comandante Ferraz", under controlled conditions. Animals collected at Admiralty Bay were acclimated to temperatures of 0°C; 2.5°C and 5°C and to salinities of 35, 30 and 25. Thirty measurements were made for each of the nine combinations of the three temperatures and three salinities, totalling 270 measurements. Metabolic rates were assessed by oxygen consumption and total nitrogenous ammonia excretion, in sealed respirometers. When acclimated to salinities 30 or 35, metabolic rates at 0°C and 2.5°C were very similar indicating a possible mechanism of metabolic compensation for temperature. At 5.0°C, however, metabolic rates were always higher. Lower salinities enhanced the effects of temperature on metabolism and ammonia excretion rates. The physiological adaptations of individuals of G. antarctica suggest adaptive mechanisms for energy saving, adjusted to an environment with stable conditions of temperature and salinity. Little is known about the joint effects of salinity and temperature and this study is an important contribution to the understanding of the mechanism of polar organisms in their adaptation to both factors. R E S U M OAlterações ambientais podem modificar a alocação de energia dos organismos, principalmente dos ectotermos estenotérmicos e/ou estenohalinos. Nesse contexto, este trabalho contribui com o conhecimento da demanda de energia do anfípode antártico Gondogeneia antarctica em função da temperatura e da salinidade. Experimentos foram realizados na Estação Antártica Brasileira "Comandante Ferraz", em condições laboratoriais controladas. Animais coletados na Baía do Almirantado foram aclimatados a temperaturas de 0°C; 2.5°C e 5°C e salinidades de 35, 30 and 25. Foram realizadas trinta medições para cada uma das nove combinações das três temperaturas com as três salinidades, totalizando 270 medições. As taxas metabólicas foram estimadas por meio do consumo de oxigênio e excreção de amônia, em câmaras respirométricas seladas. Quando aclimatados a salinidades 30 ou 35, as taxas metabólicas a 0°C e 2.5°C foram semelhantes indicando possível mecanismo de compensação térmica, nessa faixa de variação dos fatores. A 5.0°C, no entanto, as taxas metabólicas foram sempre mais elevadas. Baixas salinidades potencializaram os efeitos da temperatura no consumo de oxigênio e na excreção de produtos nitrogenados. Os resultados estão relacionados a mecanismos adaptativos para economia de energia em indivíduos G. antarctica, ajustados a um ambiente que tem condições estáveis de temperatura e de salinidade. Pouco se sabe sobre os efeitos conjugados da salinidade e temperatura nos organismos e...

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Section: Discussionsupporting

confidence: 49%

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

et al. 2013

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“…Couloximetry is one of the methods that has successfully been used for oxygen measurements of polar invertebrates in several studies (e.g. Chapelle et al 1994;Chapelle and Peck 1995;Schmid 1996;Brockington 2001;Peck and Veal 2001). The authors gained precision but lost high temporal resolution by utilizing this method.…”

Section: Respiration Experimentsmentioning

confidence: 99%

“…Polar invertebrates usually have low oxygen consumption rates (e.g. Clarke 1983;Chapelle et al 1994;Chapelle and Peck 1995;Peck and Conway 2000, and references therein). When comparing sessile invertebrates with motile fauna we can expect a considerably lower metabolic activity and thus extremely low oxygen consumption rates.…”

Section: Introductionmentioning

confidence: 99%

Oxygen microoptodes: a new tool for oxygen measurements in aquatic animal ecology

et al. 2002

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We describe two applications of a recently introduced system for very precise, continuous measurement of water oxygen saturation. Oxygen microoptodes (based on the dynamic fluorescence quenching principle) with a tip diameter of $50 lm, an eightchannel optode array, an intermittent flow system, and online data registration were used to perform two types of experiments. The metabolic activity of Antarctic invertebrates (sponges and scallops) was estimated in respiration experiments, and, secondly, oxygen saturation inside living sponge tissue was determined in different flow regimes. Even in long-term experiments (several days) no drift was detectable in between calibrations. Data obtained were in excellent correspondence with control measurements performed with a modified Winkler method. Antarctic invertebrates in our study showed low oxygen consumption rates, ranging from 0.03-0.19 cm 3 O 2 h -1 ind. -1 . Oxygen saturation inside living sponge specimens was affected by flow regime and culturing conditions of sponges. Our results suggest that oxygen optodes are a reliable tool for oxygen measurements beyond the methodological limits of traditional methods.

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“…Pearse et al 1991, Brey and Clarke 1993, Arntz et al 1994, Peck and Robinson 1994, Chapelle and Peck 1995, Peck et al 2000, Peck 2002, Peck et al 2004a, McClintock et al 2008. Growth and development rates of Antarctic benthic organisms are about fi ve times slower than of similar species from lower latitudes (Arntz et al 1994, Peck et al 2000, Pearse et al 1991, Peck Robinson 1994.…”

Section: Antarctic Benthic Faunamentioning

confidence: 99%

Antarctic Benthic Fauna in the Global Climate Change

Kidawa¹,

Janecki²

2011

Papers on Global Change IGBP

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ABSTRACT:In the last 50 years a signifi cant climatic shift has been observed along the Antarctic Peninsula (air and seawater temperature rise, glacial retreat, localized instances of lowered shallow waters salinities). Many Antarctic marine benthic invertebrates are adapted to specifi c environmental conditions (e.g. low stable temperatures, high salinity and oxygen content). Changes caused by global climate changes and subsequent glacial melting can be expected to have signifi cant impacts on species physiology and distribution. The rise of sea water temperature coupled with such additional stress factors as melt water run-off, increased ice disturbance, disruption of food webs or invasion of alien species can be a serious problem for their long-term survival.

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The influence of acclimation and substratum on the metabolism of the Antarctic amphipods Waldeckia obesa (Chevreux 1905) and Bovallia gigantea (Pfeffer 1888)

Abstract: The influence of acclimation and substratum on the metabolism of the Antarctic amphipods Waldeckia obesa (Chevreux 1905) and Bovallia gigantea (Pfeffer 1888)

Cited by 50 publications

References 38 publications

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

Oxygen microoptodes: a new tool for oxygen measurements in aquatic animal ecology

Antarctic Benthic Fauna in the Global Climate Change

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