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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2012
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| Online-Zugang: | https://doi.org/10.1594/PANGAEA.772712 |
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| _version_ | 1867171780757553152 |
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| author | Roleda, Michael Y Morris, Jaz N McGraw, Christina M Hurd, Catriona L |
| author_facet | Roleda, Michael Y Morris, Jaz N McGraw, Christina M Hurd, Catriona L |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The worldwide effects of ocean acidification (OA) on marine species are a growing concern. In temperate coastal seas, seaweeds are dominant primary producers that create complex habitats and supply energy to higher trophic levels. Studies on OA and macroalgae have focused on calcifying species and adult stages but, critically, they have overlooked the microscopic stages of the reproductive life cycle, which, for other anthropogenic stress e.g. UV-B radiation, are the most susceptible life-history phase. Also, environmental cues and stressors can cause changes in the sex ratio which has implications for the mating system and recruitment success. Here, we report the effects of pH (7.59-8.50) on meiospore germination and sex determination for the giant kelp, Macrocystis pyrifera (Laminariales), in the presence and absence of additional dissolved inorganic carbon (DIC). Lowered pH (7.59-7.60, using HCl-only) caused a significant reduction in germination, while added DIC had the opposite effect, indicating that increased CO2 at lower pH ameliorates physiological stress. This finding also highlights the importance of appropriate manipulation of seawater carbonate chemistry when testing the effects of ocean acidification on photosynthetic organisms. The proportion of male to female gametophytes did not vary significantly between treatments suggesting that pH was not a primary environmental modulator of sex. Relative to the baseline (pH 8.19), gametophytes were 32% larger under moderate OA (pH 7.86) compared to their size (10% increase) under extreme OA (pH 7.61). This study suggests that metabolically-active cells can compensate for the acidification of seawater. This homeostatic function minimises the negative effects of lower pH (high H+ ions) on cellular activity. The 6-9% reduction in germination success under extreme OA suggests that meiospores of M.pyrifera may be resistant to future ocean acidification. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_772712 |
| institution | PANGAEA |
| language | en |
| publishDate | 2012 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Seawater carbonate chemistry and giant kelp Macrocystis pyrifera reproduction processes during experiments, 2011 Roleda, Michael Y Morris, Jaz N McGraw, Christina M Hurd, Catriona L Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Calculated using SWCO2 (Hunter, 2007); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, partial pressure, standard deviation; Chromista; Closed cell titration; Coast and continental shelf; Dihydrogen carbonate; Dihydrogen carbonate, standard deviation; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; Laboratory experiment; Macroalgae; Macrocystis pyrifera; Macrocystis pyrifera, gametophyte size; Macrocystis pyrifera, gametophyte size, standard deviation; Macrocystis pyrifera, germination rate; Macrocystis pyrifera, germination rate, standard deviation; Macrocystis pyrifera, sex ratio; Macrocystis pyrifera, sex ratio, standard deviation; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, standard deviation; pH, total scale; pH meter (Orion 720A); Reproduction; Salinity; Single species; South Pacific; Temperate; Temperature, water The worldwide effects of ocean acidification (OA) on marine species are a growing concern. In temperate coastal seas, seaweeds are dominant primary producers that create complex habitats and supply energy to higher trophic levels. Studies on OA and macroalgae have focused on calcifying species and adult stages but, critically, they have overlooked the microscopic stages of the reproductive life cycle, which, for other anthropogenic stress e.g. UV-B radiation, are the most susceptible life-history phase. Also, environmental cues and stressors can cause changes in the sex ratio which has implications for the mating system and recruitment success. Here, we report the effects of pH (7.59-8.50) on meiospore germination and sex determination for the giant kelp, Macrocystis pyrifera (Laminariales), in the presence and absence of additional dissolved inorganic carbon (DIC). Lowered pH (7.59-7.60, using HCl-only) caused a significant reduction in germination, while added DIC had the opposite effect, indicating that increased CO2 at lower pH ameliorates physiological stress. This finding also highlights the importance of appropriate manipulation of seawater carbonate chemistry when testing the effects of ocean acidification on photosynthetic organisms. The proportion of male to female gametophytes did not vary significantly between treatments suggesting that pH was not a primary environmental modulator of sex. Relative to the baseline (pH 8.19), gametophytes were 32% larger under moderate OA (pH 7.86) compared to their size (10% increase) under extreme OA (pH 7.61). This study suggests that metabolically-active cells can compensate for the acidification of seawater. This homeostatic function minimises the negative effects of lower pH (high H+ ions) on cellular activity. The 6-9% reduction in germination success under extreme OA suggests that meiospores of M.pyrifera may be resistant to future ocean acidification. |
| title | Seawater carbonate chemistry and giant kelp Macrocystis pyrifera reproduction processes during experiments, 2011 |
| topic | Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Calculated using SWCO2 (Hunter, 2007); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, partial pressure, standard deviation; Chromista; Closed cell titration; Coast and continental shelf; Dihydrogen carbonate; Dihydrogen carbonate, standard deviation; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Identification; Laboratory experiment; Macroalgae; Macrocystis pyrifera; Macrocystis pyrifera, gametophyte size; Macrocystis pyrifera, gametophyte size, standard deviation; Macrocystis pyrifera, germination rate; Macrocystis pyrifera, germination rate, standard deviation; Macrocystis pyrifera, sex ratio; Macrocystis pyrifera, sex ratio, standard deviation; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, standard deviation; pH, total scale; pH meter (Orion 720A); Reproduction; Salinity; Single species; South Pacific; Temperate; Temperature, water |
| url | https://doi.org/10.1594/PANGAEA.772712 |