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Toxic algae silence physiological responses to multiple climate drivers in a tropical marine food chain

Turner, Lucy M.; Havenhand, Jonathan N.; Alsterberg, Christian LU ; Turner, Andrew D.; Girisha, S. K.; Rai, Ashwin; Venugopal, M. N.; Karunasagar, Indrani and Godhe, Anna LU (2019) In Frontiers in Physiology 10(APR).
Abstract

Research on the effects of climate change in the marine environment continues to accelerate, yet we know little about the effects of multiple climate drivers in more complex, ecologically relevant settings - especially in sub-tropical and tropical systems. In marine ecosystems, climate change (warming and freshening from land run-off) will increase water column stratification which is favorable for toxin producing dinoflagellates. This can increase the prevalence of toxic microalgal species, leading to bioaccumulation of toxins by filter feeders, such as bivalves, with resultant negative impacts on physiological performance. In this study we manipulated multiple climate drivers (warming, freshening, and acidification), and the... (More)

Research on the effects of climate change in the marine environment continues to accelerate, yet we know little about the effects of multiple climate drivers in more complex, ecologically relevant settings - especially in sub-tropical and tropical systems. In marine ecosystems, climate change (warming and freshening from land run-off) will increase water column stratification which is favorable for toxin producing dinoflagellates. This can increase the prevalence of toxic microalgal species, leading to bioaccumulation of toxins by filter feeders, such as bivalves, with resultant negative impacts on physiological performance. In this study we manipulated multiple climate drivers (warming, freshening, and acidification), and the availability of toxic microalgae, to determine their impact on the physiological health, and toxin load of the tropical filter-feeding clam, Meretrix meretrix. Using a structural equation modeling (SEM) approach, we found that exposure to projected marine climates resulted in direct negative effects on metabolic and immunological function and, that these effects were often more pronounced in clams exposed to multiple, rather than single climate drivers. Furthermore, our study showed that these physiological responses were modified by indirect effects mediated through the food chain. Specifically, we found that when bivalves were fed with a toxin-producing dinoflagellate (Alexandrium minutum) the physiological responses, and toxin load changed differently and in a non-predictable way compared to clams exposed to projected marine climates only. Specifically, oxygen consumption data revealed that these clams did not respond physiologically to climate warming or the combined effects of warming, freshening and acidification. Our results highlight the importance of quantifying both direct and, indirect food chain effects of climate drivers on a key tropical food species, and have important implications for shellfish production and food safety in tropical regions.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Arabian Sea, Climate change, Indirect effects, Meretrix, Multiple drivers, PSP, Structural equation modeling, Trophic/food chain
in
Frontiers in Physiology
volume
10
issue
APR
publisher
Frontiers
external identifiers
  • scopus:85068204950
ISSN
1664-042X
DOI
10.3389/fphys.2019.00373
language
English
LU publication?
yes
id
7749640d-dcd8-4c7d-b34b-632f170ad456
date added to LUP
2019-07-10 12:25:17
date last changed
2019-08-06 03:24:05
@article{7749640d-dcd8-4c7d-b34b-632f170ad456,
  abstract     = {<p>Research on the effects of climate change in the marine environment continues to accelerate, yet we know little about the effects of multiple climate drivers in more complex, ecologically relevant settings - especially in sub-tropical and tropical systems. In marine ecosystems, climate change (warming and freshening from land run-off) will increase water column stratification which is favorable for toxin producing dinoflagellates. This can increase the prevalence of toxic microalgal species, leading to bioaccumulation of toxins by filter feeders, such as bivalves, with resultant negative impacts on physiological performance. In this study we manipulated multiple climate drivers (warming, freshening, and acidification), and the availability of toxic microalgae, to determine their impact on the physiological health, and toxin load of the tropical filter-feeding clam, Meretrix meretrix. Using a structural equation modeling (SEM) approach, we found that exposure to projected marine climates resulted in direct negative effects on metabolic and immunological function and, that these effects were often more pronounced in clams exposed to multiple, rather than single climate drivers. Furthermore, our study showed that these physiological responses were modified by indirect effects mediated through the food chain. Specifically, we found that when bivalves were fed with a toxin-producing dinoflagellate (Alexandrium minutum) the physiological responses, and toxin load changed differently and in a non-predictable way compared to clams exposed to projected marine climates only. Specifically, oxygen consumption data revealed that these clams did not respond physiologically to climate warming or the combined effects of warming, freshening and acidification. Our results highlight the importance of quantifying both direct and, indirect food chain effects of climate drivers on a key tropical food species, and have important implications for shellfish production and food safety in tropical regions.</p>},
  articleno    = {00373},
  author       = {Turner, Lucy M. and Havenhand, Jonathan N. and Alsterberg, Christian and Turner, Andrew D. and Girisha, S. K. and Rai, Ashwin and Venugopal, M. N. and Karunasagar, Indrani and Godhe, Anna},
  issn         = {1664-042X},
  keyword      = {Arabian Sea,Climate change,Indirect effects,Meretrix,Multiple drivers,PSP,Structural equation modeling,Trophic/food chain},
  language     = {eng},
  number       = {APR},
  publisher    = {Frontiers},
  series       = {Frontiers in Physiology},
  title        = {Toxic algae silence physiological responses to multiple climate drivers in a tropical marine food chain},
  url          = {http://dx.doi.org/10.3389/fphys.2019.00373},
  volume       = {10},
  year         = {2019},
}