{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T15:33:03Z","timestamp":1788881583860,"version":"build-2803163510"},"reference-count":72,"publisher":"The Company of Biologists","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Seawater acidification due to anthropogenic release of CO2 as well as the potential leakage of pure CO2 from sub-seabed carbon capture storage sites (CCS) may impose a serious threat to marine organisms. Although infaunal organisms can be expected to be particularly impacted by decreases in seawater pH, due to naturally acidified conditions in benthic habitats, information regarding physiological and behavioral responses is still scarce. Determination of pO2 and pCO2 gradients within the burrows of the brittlestar Amphiura filiformis during environmental hypercapnia demonstrated that besides hypoxic conditions, increases of environmental pCO2 are additive to the already high pCO2 (up to 0.08 kPa) within the burrows. In response to up to 4 weeks exposure to pH 7.3 (0.3 kPa pCO2) and pH 7.0 (0.6 kPa pCO2), metabolic rates of A.filiformis were significantly reduced in pH 7.0 treatments accompanied by increased ammonium excretion rates. Gene expression analyses demonstrated significant reductions of acid-base (NBCe and AQP9) and metabolic (G6PDH, LDH) genes. Determination of extracellular acid-base status indicated an uncompensated acidosis in CO2 treated animals, which could explain depressed metabolic rates. Metabolic depression is associated with a retraction of filter feeding arms into sediment burrows. Regeneration of lost arm tissues following traumatic amputation is associated with significant increases in metabolic rate, and hypercapnic conditions (pH 7.0, 0.6 KPa) dramatically reduce the metabolic scope for regeneration reflected in 80% reductions in regeneration rate. Thus, the present work demonstrates that elevated seawater pCO2 significantly affects the environment and the physiology of infaunal organisms like A. filiformis.<\/jats:p>","DOI":"10.1242\/jeb.100024","type":"journal-article","created":{"date-parts":[[2014,4,16]],"date-time":"2014-04-16T00:21:26Z","timestamp":1397607686000},"source":"Crossref","is-referenced-by-count":29,"title":["Energy metabolism and regeneration impaired by seawater acidification in the infaunal brittlestar,<i>Amphiura filiformis<\/i>"],"prefix":"10.1242","author":[{"given":"Marian Y.","family":"Hu","sequence":"first","affiliation":[{"name":"University of Gothenburg, Sweden; Academia Sinica, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Isabel","family":"Casties","sequence":"additional","affiliation":[{"name":"University of Gothenburg, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meike","family":"Stumpp","sequence":"additional","affiliation":[{"name":"University of Gothenburg, Sweden; Academia Sinica, Taiwan;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olga","family":"Ortega-Martinez","sequence":"additional","affiliation":[{"name":"University of Gothenburg, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sam T.","family":"Dupont","sequence":"additional","affiliation":[{"name":"University of Gothenburg, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2014,1,1]]},"reference":[{"key":"2021042507323572200_R1","doi-asserted-by":"crossref","first-page":"639","DOI":"10.1111\/j.1095-8649.1987.tb05268.x","article-title":"Behavioural and physiological adaptations to a burrowing lifestyle in the snake blenny, Lumpenus lampretaeformis, and the red band-fish, Cepola rubescens","volume":"31","author":"Atkinson","year":"1987","journal-title":"J. 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