# Day length as a key factor moderating the response of coccolithophore growth to elevated pCO2
> Bretherton L.

URL kanonis: https://discover.unhas.ac.id/publications/day-length-as-a-key-factor-moderating-the-response-of-coccolithophore-growth-to
Jurnal / Konferensi: Limnology and Oceanography
Tahun terbit: 2019
DOI: https://doi.org/10.1002/lno.11115
ISSN: 19395590
Kuartil SJR: Q1
Citations: 8

## Authors
- Bretherton L.

## Abstract
Abstract The fate of coccolithophores in the future oceans remains uncertain, in part due to key factors having not been standardized across experiments. A potentially moderating role for differences in day length (photoperiod) remains largely unexplored. We therefore cultured four different geographical isolates of the species Emiliania huxleyi , as well as two additional species, Gephyrocapsa oceanica (tropical) and Coccolithus braarudii (temperate), to test for interactive effects of p CO 2 with the light : dark (L : D) cycle. We confirmed a general regulatory effect of photoperiod on the p CO 2 response, whereby growth and particulate inorganic carbon and particulate organic carbon (PIC : POC) ratios were reduced with elevated p CO 2 under 14 : 10 h L : D, but these reductions were dampened under continuous (24 h) light. The dynamics underpinning this pattern generally differed for the temperate vs. tropical isolates. Reductions in PIC : POC with elevated p CO 2 for tropical taxa were largely through reduced calcification and enhanced photosynthesis under 14 : 10 h L : D, with differences dampened under continuous light. In contrast, reduced PIC : POC for temperate strains reflected increases of photosynthesis that outpaced increases in calcification rates under 14 : 10 h L : D, with both responses again dampened under continuous light. A multivariate analysis of 35 past studies of E. huxleyi further demonstrated that differences in photoperiod account for as much as 40% (strain B11/92) to 55% (strain NZEH) of the variance in reported p CO 2 ‐induced reductions to growth but not PIC : POC. Our study thus highlights a critical role for day length in moderating the effect of ocean acidification on coccolithophore growth and consequently how this response may play out across latitudes and seasons in future oceans.

## Keywords
- Emiliania huxleyi
- Coccolithophore
- Temperate climate
- Biology
- Photosynthesis
- photoperiodism
- Total inorganic carbon
- Botany
- Ecology
- Phytoplankton
- Nutrient
- Carbon dioxide

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Sumber: Discover Unhas — RIMS Universitas Hasanuddin.
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