67-8 Sat Jan 2 Maternal environment drives larval rockfish gene expression patterns Baker, JB*; Saksa, KV; Kashef, NS; Stafford, DM; Sogard, SM; Hamilton, SL; Logan, CA; Moss Landing Marine Laboratories and CSU Monterey Bay; Moss Langing Marine Laboratories; Marine Science Institute UCSC and NMFS South West Fisheries Science Center; Marine Science Institute UCSC and NMFS South West Fisheries Science Center; NMFS South West Fisheries Science Center; Moss Landing Marine Laboratories; CSU Monterey Bay jabaker@csumb.edu
Global climate change is driving shifts in ocean chemistry, which combined with intensification of coastal upwelling, reduces ocean pH and dissolved oxygen (DO) content in the nearshore habitats of the California Current System. Physiological plasticity, within and across generations, might be especially important for long-lived, late-to-mature species, like rockfishes (genus Sebastes), that may be unable to keep pace with climate change via genetic adaptation. Rockfishes exhibit matrotrophic viviparity and may be able to buffer their offspring from environmental stress through early developmental exposure or transgenerational plasticity (non-genetic inheritance of phenotypes). We pre-exposed mother gopher (S. carnatus) and blue (S. mystinus) rockfish to one of four treatments; 1) ambient conditions, 2) low pH, 3) low DO, or 4) combined low pH/DO stressor during fertilization and gestation, followed by a 5-day larval exposure after birth in either the same or different treatment. We used RNA sequencing to determine how the maternal environment affected larval rockfish gene expression (GE). We found that the maternal exposure drove larval GE patterns regardless of sampling time point or treatment. Furthermore, the maternal environment continued to strongly influence larval GE for at least the first five days after birth. These data suggest that rockfish may not be able to buffer their offspring from environmental stressors, highlighting the important role of the maternal environment during gestation.