کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5744458 1618384 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Differential growth responses to water flow and reduced pH in tropical marine macroalgae
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Differential growth responses to water flow and reduced pH in tropical marine macroalgae
چکیده انگلیسی


- All three species had the highest growth rates at the intermediate flow speed.
- Water flow had a greater effect on macroalgal growth rates than OA.
- OA did not enhance growth rates of algae.
- A. rhodantha (red alga) was the most sensitive to reduced water motion.

The physical environment plays a key role in facilitating the transfer of nutrients and dissolved gases to marine organisms and can alter the rate of delivery of dissolved inorganic carbon. For non-calcifying macroalgae, water motion can influence the physiological and ecological responses to various environmental changes such as ocean acidification (OA). We tested the effects of lowered pH under three different flow speeds on three dominant non-calcifying macroalgal species differing in their carbon-use and are commonly found in the back reefs of Moorea, French Polynesia. Relative growth rates (RGR) of two phaeophytes, Dictyota bartayresiana and Lobophora variegata (HCO3− users), and a rhodophyte, Amansia rhodantha (CO2 user) were measured to examine how the combined effects of OA and flow can affect algal growth. Growth rates were affected independently by pCO2 and flow treatments but there was no significant interactive effect. Additionally, growth rates among species varied within the different flow regimes. Of the three species, L. variegata had the overall greatest increase in RGR across all three flow speeds while A. rhodantha exhibited the greatest negative impact under elevated pCO2 at 0.1 cm·s− 1. These differential responses among algal species demonstrate the importance of flow when examining responses to a changing environment, and if the responses of macroalgae differ based on their carbon-use strategies, it may provide advantages to some macroalgal species in a future, more acidic ocean.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Experimental Marine Biology and Ecology - Volume 491, June 2017, Pages 58-65
نویسندگان
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