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Persistence of Positive Carryover Effects in the Oyster, Saccostrea glomerata, following Transgenerational Exposure to Ocean Acidification.

Parker LM, O'Connor WA, Raftos DA, Pörtner HO, Ross PM - PLoS ONE (2015)

Bottom Line: But whether these positive carryover effects can persist into adulthood or the next generation is unknown.We found that the capacity of adults to regulate extracellular pH at elevated CO2 was improved if they had a prior history of transgenerational exposure to elevated CO2.Offspring with a history of transgenerational exposure to elevated CO2 had a lower percentage abnormality, faster development rate, faster shell growth and increased heart rate at elevated CO2 compared with F2 offspring with no prior history of exposure to elevated CO2.

View Article: PubMed Central - PubMed

Affiliation: School of Science and Health, University of Western Sydney, Hawkesbury K12, Locked Bag 1797, Penrith South DC 2751, Sydney, New South Wales, Australia.

ABSTRACT
Ocean acidification (OA) is predicted to have widespread implications for marine organisms, yet the capacity for species to acclimate or adapt over this century remains unknown. Recent transgenerational studies have shown that for some marine species, exposure of adults to OA can facilitate positive carryover effects to their larval and juvenile offspring that help them to survive in acidifying oceanic conditions. But whether these positive carryover effects can persist into adulthood or the next generation is unknown. Here we tested whether positive carryover effects found in larvae of the oyster, Saccostrea glomerata following transgenerational exposure to elevated CO2, could persist into adulthood and whether subsequent transgenerational exposure of adults to elevated CO2 would facilitate similar adaptive responses in the next generation of larvae and juveniles. Following our previous transgenerational exposure of parental adults and first generation (F1) larvae to ambient (385 μatm) and elevated (856 μatm) CO2, newly settled F1 juveniles were transferred to the field at ambient CO2 for 14 months, until they reached reproductive maturity. At this time, the F1 adults were returned to the laboratory and the previous transgenerational CO2 exposure was repeated to produce F2 offspring. We found that the capacity of adults to regulate extracellular pH at elevated CO2 was improved if they had a prior history of transgenerational exposure to elevated CO2. In addition, subsequent transgenerational exposure of these adults led to an increase in the resilience of their larval and juvenile offspring. Offspring with a history of transgenerational exposure to elevated CO2 had a lower percentage abnormality, faster development rate, faster shell growth and increased heart rate at elevated CO2 compared with F2 offspring with no prior history of exposure to elevated CO2. Our results suggest that positive carryover effects originating during parental and larval exposure will be important in mediating some of the impacts of OA for later life-history stages and generations.

No MeSH data available.


Related in: MedlinePlus

The response of F1-control and F1-transgen Saccostrea glomerata adults to ambient and elevated CO2.Extracellular pH (pHe) (a), standard metabolic rate (SMR) (b) after 5 w of exposure to the CO2 treatments (mean ± SE) (24°C, salinity 34.5 ppt).
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pone.0132276.g002: The response of F1-control and F1-transgen Saccostrea glomerata adults to ambient and elevated CO2.Extracellular pH (pHe) (a), standard metabolic rate (SMR) (b) after 5 w of exposure to the CO2 treatments (mean ± SE) (24°C, salinity 34.5 ppt).

Mentions: There was a significant interaction effect between CO2 and transgenerational exposure on the pHe of F1 adults (Fig 2a; MS = 0.02, F = 25.26, df = 1; P< 0.01). After 5 w at elevated CO2, the F1-control adults experienced a reduction in pHe (-0.43 pH unit reduction compared with the F1-control adults reared at ambient CO2). In the F1-transgen adults, there was also a reduction in pHe after 5 w at elevated CO2, however, the reduction was to a significantly lesser degree (-0.3 pH unit reduction compared with the F1-transgen adults reared at ambient CO2) (Fig 2a; MS = 0.02, F = 25.26, df = 1; P< 0.01; SNK 385 μatm: F1-transgen = F1-control, 856 μatm: F1 CO2-exposed > F1 control).


Persistence of Positive Carryover Effects in the Oyster, Saccostrea glomerata, following Transgenerational Exposure to Ocean Acidification.

Parker LM, O'Connor WA, Raftos DA, Pörtner HO, Ross PM - PLoS ONE (2015)

The response of F1-control and F1-transgen Saccostrea glomerata adults to ambient and elevated CO2.Extracellular pH (pHe) (a), standard metabolic rate (SMR) (b) after 5 w of exposure to the CO2 treatments (mean ± SE) (24°C, salinity 34.5 ppt).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493068&req=5

pone.0132276.g002: The response of F1-control and F1-transgen Saccostrea glomerata adults to ambient and elevated CO2.Extracellular pH (pHe) (a), standard metabolic rate (SMR) (b) after 5 w of exposure to the CO2 treatments (mean ± SE) (24°C, salinity 34.5 ppt).
Mentions: There was a significant interaction effect between CO2 and transgenerational exposure on the pHe of F1 adults (Fig 2a; MS = 0.02, F = 25.26, df = 1; P< 0.01). After 5 w at elevated CO2, the F1-control adults experienced a reduction in pHe (-0.43 pH unit reduction compared with the F1-control adults reared at ambient CO2). In the F1-transgen adults, there was also a reduction in pHe after 5 w at elevated CO2, however, the reduction was to a significantly lesser degree (-0.3 pH unit reduction compared with the F1-transgen adults reared at ambient CO2) (Fig 2a; MS = 0.02, F = 25.26, df = 1; P< 0.01; SNK 385 μatm: F1-transgen = F1-control, 856 μatm: F1 CO2-exposed > F1 control).

Bottom Line: But whether these positive carryover effects can persist into adulthood or the next generation is unknown.We found that the capacity of adults to regulate extracellular pH at elevated CO2 was improved if they had a prior history of transgenerational exposure to elevated CO2.Offspring with a history of transgenerational exposure to elevated CO2 had a lower percentage abnormality, faster development rate, faster shell growth and increased heart rate at elevated CO2 compared with F2 offspring with no prior history of exposure to elevated CO2.

View Article: PubMed Central - PubMed

Affiliation: School of Science and Health, University of Western Sydney, Hawkesbury K12, Locked Bag 1797, Penrith South DC 2751, Sydney, New South Wales, Australia.

ABSTRACT
Ocean acidification (OA) is predicted to have widespread implications for marine organisms, yet the capacity for species to acclimate or adapt over this century remains unknown. Recent transgenerational studies have shown that for some marine species, exposure of adults to OA can facilitate positive carryover effects to their larval and juvenile offspring that help them to survive in acidifying oceanic conditions. But whether these positive carryover effects can persist into adulthood or the next generation is unknown. Here we tested whether positive carryover effects found in larvae of the oyster, Saccostrea glomerata following transgenerational exposure to elevated CO2, could persist into adulthood and whether subsequent transgenerational exposure of adults to elevated CO2 would facilitate similar adaptive responses in the next generation of larvae and juveniles. Following our previous transgenerational exposure of parental adults and first generation (F1) larvae to ambient (385 μatm) and elevated (856 μatm) CO2, newly settled F1 juveniles were transferred to the field at ambient CO2 for 14 months, until they reached reproductive maturity. At this time, the F1 adults were returned to the laboratory and the previous transgenerational CO2 exposure was repeated to produce F2 offspring. We found that the capacity of adults to regulate extracellular pH at elevated CO2 was improved if they had a prior history of transgenerational exposure to elevated CO2. In addition, subsequent transgenerational exposure of these adults led to an increase in the resilience of their larval and juvenile offspring. Offspring with a history of transgenerational exposure to elevated CO2 had a lower percentage abnormality, faster development rate, faster shell growth and increased heart rate at elevated CO2 compared with F2 offspring with no prior history of exposure to elevated CO2. Our results suggest that positive carryover effects originating during parental and larval exposure will be important in mediating some of the impacts of OA for later life-history stages and generations.

No MeSH data available.


Related in: MedlinePlus