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Evaluation of a semi-automatic system for long-term seawater carbonate chemistry manipulation RChHN
TORRES,RODRIGO; MANRIQUEZ,PATRICIO H; DUARTE,CRISTIAN; NAVARRO,JORGE M; LAGOS,NELSON A; VARGAS,CRISTIAN A; LARDIES,MARCO A.
The assessment of the effects of Ocean Acidification (OA) on marine life has received increasing attention in recent marine research. On a mesocosmic scale, the CO2 levels in seawater can be manipulated to evaluate experimentally the consequences of OA on marine organisms (vertebrates and invertebrates). An ideal manipulation of carbonate chemistry should mimic exactly the changes to carbonate chemistry, which will occur in years to come. Although some methods have been described in the literature, here we describe in detail a simple, robust and inexpensive system to produce CO2-enriched seawater by bubbling the seawater with air-CO2 mixtures. The system uses mass flow controllers (MFC) to blend atmospheric air with pure CO2 to produce two pCO2 levels. The...
Tipo: Journal article Palavras-chave: Carbonate chemistry manipulation; Ocean acidification.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000400006
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Diet-induced developmental plasticity in life histories and energy metabolism in a beetle RChHN
URREJOLA,SERGIO; NESPOLO,ROBERTO; LARDIES,MARCO A.
Adaptive phenotypic plasticity, has been recognized as an important strategy by which organisms maximize fitness in variable environments, which vary through development. A disassociation among stages should represent a null effect of the environment experienced during early ontogeny in the expression of adult traits. Food quality greatly influences survival, development and reproduction in many arthropod herbivores. We examined the effects of diet protein in physiological and life-history traits in the yellow mealworm beetle Tenebrio molitor through ontogeny. We established four experimental treatments: Low Protein (LP), Low Protein Control (LPC), High Protein (HP), and High Protein Control (HPC) with recently eclosioned larvae each. Individuals were...
Tipo: Journal article Palavras-chave: CO2 production; Complex life-cycle; Food quality; Metabolism; Ontogeny.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000400005
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