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Narrow range of temperature and irradiance supports optimal development of Lessonia corrugata (Ochrophyta) gametophytes: implications for kelp aquaculture and responses to climate change

Citation

Paine, ER and Schmid, M and Gaitan-Espitia, JD and Castle, J and Jameson, I and Sanderson, JC and Hurd, CL, Narrow range of temperature and irradiance supports optimal development of Lessonia corrugata (Ochrophyta) gametophytes: implications for kelp aquaculture and responses to climate change, Journal of Applied Phycology, 33 pp. 1721-1730. ISSN 0921-8971 (2021) [Refereed Article]


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DOI: doi:10.1007/s10811-021-02382-7

Abstract

The kelp Lessonia corrugata (Ochrophyta, Laminariales) is being developed for integrated multi-trophic aquaculture (IMTA) trials in the vicinity of salmon cages in Tasmania, Australia. Gametophytes are vegetally maintained before seeding on hatchery twine; however, the optimal temperature and light conditions for growth and sexual development are unknown. We measured vegetative size of female and male gametophytes and sexual development of females over a range of temperatures and irradiances using a temperature gradient table and neutral density light filters. Over a 4-week experiment, gametophytes were exposed to a combination of thermal (5.724.9 C) and irradiance (10100 μmol photons m−2 s−1) gradients, to assess biological performance. At the temperature extremes (hottest = 24.9 C, coldest = 5.7 C), we observed the critical thermal limits for this species and the results reveal a narrow optimal temperature range for growth and sexual development between 15.7 and 17.9 C, with irradiances between 40 and 100 μmol photons m−2 s−1 resulting in fertile female gametophytes. Lessonia corrugata inhabits a small geographic range, found only around Tasmania, south of the Australian mainland, hence oceanic changes such as ongoing increases in sea surface temperatures (SSTs), and altered irradiance regimes may limit recruitment of the early microscopic life stages in the future. Our findings provide optimised culture conditions for aquaculture and information to predict the future geographic range of L. corrugata under ocean global change.

Item Details

Item Type:Refereed Article
Keywords:kelp, aquaculture, climate change, microscopic stages, gametophytes, irradiance, Laminariales, Lessonia corrugata, macroalgae, temperature
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Paine, ER ( Ellie Paine)
UTAS Author:Schmid, M (Dr Matthias Schmid)
UTAS Author:Castle, J (Mr Joshua Castle)
UTAS Author:Hurd, CL (Professor Catriona Hurd)
ID Code:142872
Year Published:2021
Web of Science® Times Cited:3
Deposited By:Ecology and Biodiversity
Deposited On:2021-02-12
Last Modified:2021-09-30
Downloads:3 View Download Statistics

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