Fight and flight in dinoflagellates? Kinetics of simultaneous grazer-induced responses in Alexandrium tamarense
(2012) In Limnology and Oceanography 57(1). p.58-64- Abstract
- We monitored the kinetics of grazer-induced responses in the marine dinoflagellate Alexandrium tamarense. Chemical cues from each of three calanoid copepods (Calanus sp., Centropages typicus, and Acartia tonsa) induced increased toxicity and suppressed chain formation in A. tamarense. Both chemical and morphological responses augmented over 3 d. Toxicity subsequently averaged 299% higher than controls, and average biovolume 24% lower than controls because of suppression of chain formation in grazed treatments. Grazer-induced toxicity returned to control levels after approximately 11 d, equivalent to five cell divisions, and average biovolume returned to control levels within 1 to 4 d (one to two cell divisions). This suggests that... (More)
- We monitored the kinetics of grazer-induced responses in the marine dinoflagellate Alexandrium tamarense. Chemical cues from each of three calanoid copepods (Calanus sp., Centropages typicus, and Acartia tonsa) induced increased toxicity and suppressed chain formation in A. tamarense. Both chemical and morphological responses augmented over 3 d. Toxicity subsequently averaged 299% higher than controls, and average biovolume 24% lower than controls because of suppression of chain formation in grazed treatments. Grazer-induced toxicity returned to control levels after approximately 11 d, equivalent to five cell divisions, and average biovolume returned to control levels within 1 to 4 d (one to two cell divisions). This suggests that dinoflagellates simultaneously reduce grazer encounter rates and increase chemical defense levels in the presence of copepod grazers. Media replacement experiments showed that the inducing cue(s) attenuate rapidly in seawater, which allows A. tamarense to adjust resource allocation to grazer-induced responses to follow fluctuations in grazer density. Grazer-induced responses, however, develop too slowly to be accounted for in short-term grazing experiments with laboratory cultures. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2278892
- author
- Selander, Erik ; Fagerberg, Tony LU ; Wohlrab, Sylke and Pavia, Henrik
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Limnology and Oceanography
- volume
- 57
- issue
- 1
- pages
- 58 - 64
- publisher
- ASLO
- external identifiers
-
- wos:000298321300005
- scopus:81355150242
- ISSN
- 1939-5590
- DOI
- 10.4319/lo.2012.57.1.0058
- language
- English
- LU publication?
- yes
- id
- 5f66768b-7af4-400f-ab11-55fcb2738fe2 (old id 2278892)
- date added to LUP
- 2016-04-01 13:04:27
- date last changed
- 2022-03-13 22:01:21
@article{5f66768b-7af4-400f-ab11-55fcb2738fe2,
abstract = {{We monitored the kinetics of grazer-induced responses in the marine dinoflagellate Alexandrium tamarense. Chemical cues from each of three calanoid copepods (Calanus sp., Centropages typicus, and Acartia tonsa) induced increased toxicity and suppressed chain formation in A. tamarense. Both chemical and morphological responses augmented over 3 d. Toxicity subsequently averaged 299% higher than controls, and average biovolume 24% lower than controls because of suppression of chain formation in grazed treatments. Grazer-induced toxicity returned to control levels after approximately 11 d, equivalent to five cell divisions, and average biovolume returned to control levels within 1 to 4 d (one to two cell divisions). This suggests that dinoflagellates simultaneously reduce grazer encounter rates and increase chemical defense levels in the presence of copepod grazers. Media replacement experiments showed that the inducing cue(s) attenuate rapidly in seawater, which allows A. tamarense to adjust resource allocation to grazer-induced responses to follow fluctuations in grazer density. Grazer-induced responses, however, develop too slowly to be accounted for in short-term grazing experiments with laboratory cultures.}},
author = {{Selander, Erik and Fagerberg, Tony and Wohlrab, Sylke and Pavia, Henrik}},
issn = {{1939-5590}},
language = {{eng}},
number = {{1}},
pages = {{58--64}},
publisher = {{ASLO}},
series = {{Limnology and Oceanography}},
title = {{Fight and flight in dinoflagellates? Kinetics of simultaneous grazer-induced responses in Alexandrium tamarense}},
url = {{http://dx.doi.org/10.4319/lo.2012.57.1.0058}},
doi = {{10.4319/lo.2012.57.1.0058}},
volume = {{57}},
year = {{2012}},
}