Photosynthetic performance and pigment composition of Macrocystis pyrifera (Laminariales, Phaeophyceae) along a gradient of depth and seasonality in the ecoregion of Magellan, Chile

Macrocystis pyrifera (L.) C. Agardh is a species that forms extensive underwater forests along the coastline of the ecoregion of Magellan. There, this alga is exposed to marked variation in photoperiod, temperature, and irradiance, which are modulated by daily and seasonal climatic variations. This...

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Bibliographic Details
Published in:Journal of applied phycology 2017-10, Vol.29 (5), p.2575-2585
Main Authors: Marambio, J., Rodriguez, J. P., Mendez, F., Ocaranza, P., Rosenfeld, S., Ojeda, J., Rautenberger, R., Bischof, K., Terrados, J., Mansilla, A.
Format: Article
Language:English
Subjects:
22nd International Seaweed Symposium
Acclimation
Acclimatization
Algae
Autumn
Biomedical and Life Sciences
Chlorophyll
Chlorophyll a
Composition
Copenhagen
Density stratification
Depth
Ecology
Ecophysiology
Electron transport
Environmental conditions
Fluorescence
Forests
Freshwater & Marine Ecology
Fronds
Fucoxanthin
Irradiance
Keystone species
Life Sciences
Light intensity
Luminous intensity
Macrocystis pyrifera
Natural populations
Parameters
Photons
Photoperiods
Photosynthesis
Photosynthetic pigments
Pigments
Plant Physiology
Plant Sciences
Saturation
Seasonal variations
Seasons
Spring
Spring (season)
Stratification
Transport
Underwater
Winter
Yields
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Summary:Macrocystis pyrifera (L.) C. Agardh is a species that forms extensive underwater forests along the coastline of the ecoregion of Magellan. There, this alga is exposed to marked variation in photoperiod, temperature, and irradiance, which are modulated by daily and seasonal climatic variations. This study aims to understand the ecophysiological behavior of M. pyrifera , in a natural forest localized in Puerto del Hambre, Magellan Region of Chile, along spatial (depth) and temporal (season) gradients of physical drivers by analyzing algal responses in terms of the photosynthetic pigments and fluorescence yield. In the apical, middle, and basal fronds, the following photosynthetic parameters were seasonally measured: electron transport efficiency ( α ), maximum relative rate of electron transport (rETR max ), saturation point (E k ), and pigments such as chlorophyll a (Chl a ), chlorophyll c (Chl c ), and fucoxanthin. Both seasonal and stratified variations were observed. In autumn, α was decreased in the middle fronds (0.136 ± 0.030 (μmol photons m −2  s −1 ) −1 ) with respect to apical and basal fronds of autumn. For parameters such as E k , this decrease was observed relative to the depth gradient, with significant differences ( p  
ISSN:0921-8971
1573-5176
DOI:10.1007/s10811-017-1136-0