Functional trait thermal acclimation differs across three species of mid-Atlantic harmful algae

Vidyarathna, Nayani K.; Papke, Erin; Coyne, Kathryn J.; Cohen, Jonathan H.; Warner, Mark E.

doi:10.1016/j.hal.2020.101804

i

Functional trait thermal acclimation differs across three species of mid-Atlantic harmful algae

2020
By Vidyarathna, Nayani K. ; Papke, Erin ; Coyne, Kathryn J. ; ...

Details

Journal Title:

Harmful Algae
Personal Author:

Vidyarathna, Nayani K. ; Papke, Erin ; Coyne, Kathryn J. ; Cohen, Jonathan H. ; Warner, Mark E.
NOAA Program & Office:

NOS (National Ocean Service) ; NCCOS (National Centers for Coastal Ocean Science)
Description:

Characterizing the thermal niche of harmful algae is crucial for understanding and projecting the effects of future climate change on harmful algal blooms. The effects of 6 different temperatures (18–32 °C) on the growth, photophysiology, and toxicity were examined in the dinoflagellate Karlodinium veneficum, and the raphidophytes, Heterosigma akashiwo and Chattonella subsalsa from the Delaware Inland Bays (DIB). K. veneficum and H. akashiwo had skewed unimodal growth patterns, with temperature optima (Topt) at 28.6 and 27.3 °C respectively and an upper thermal niche limit of 32 °C. In contrast, C. subsalsa growth increased linearly with temperature, suggesting Topt and upper thermal boundaries >32 °C. K. veneficum photosystem II (PSII) photochemical efficiency remained stable across all temperatures, while H. akashiwo PSII efficiency declined at higher temperature and C. subsalsa was susceptible to low temperature (~18 °C) photoinactivation. Cell toxicity thermal response was species-specific such that K. veneficum toxicity increased with temperature above Topt. Raphidophyte toxicity peaked at 25–28 °C and was in close agreement with Topt for growth in H. akashiwo but below C. subsalsa maximal growth. The mode of toxicity was markedly different between the dinoflagellate and the raphidophytes such that K. veneficum had greater hemolytic activity while the raphidophytes had pronounced fish gill cell toxicity. These results and patterns of natural abundance for these algae in the DIB suggest that continued ocean warming may contribute to C. subsalsa bloom formation while possibly promoting highly toxic blooms of K. veneficum.
Keywords:

Effect Of Habitat Modification On Effect Of Water Quality On Estuarine Animals Estuarine Ecology Effect Of Habitat Modification On Effect Of Water Quality On Estuarine Animals Estuarine Ecology Harmful algae; Climate change; Thermal optima; Photophysiology; Hemolytic activity; RT Fish gill cell toxicity
Source:

Harmful Algae, 94, 1-11
DOI:

https://doi.org/10.1016/j.hal.2020.101804
Pubmed ID:

32414505
Document Type:

Journal Article
Funding:

Grant no. NA15NOS4780182
Place as Subject:

Barataria Estuary (La.)
Rights Information:

CC BY-NC-ND
Compliance:

Submitted
Main Document Checksum:

urn:sha256:000cec8cabe7d335fe934ae8447998ff197201407705615344b51656bba7b278
Download URL:

https://repository.library.noaa.gov/view/noaa/28819/noaa_28819_DS1.pdf
File Type:

[PDF - 960.84 KB ]

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