NDLI: Phytoplankton Productivity and Photophysiology in the Surf Zone of Sandy Beaches in North Carolina, USA

Content Provider	Springer Nature Link
Author	Kahn, Amanda E. Cahoon, Lawrence B.
Copyright Year	2012
Abstract	Measurements of primary production in surf-zone habitats are relatively rare and often utilize simulation approaches, owing to the physical challenges of working in surf. The study reported here examined primary production in situ at two open ocean sandy beaches in southeastern North Carolina during relatively calm summer conditions. In situ bottle incubations using $^{14}$C uptake methods were complemented by simultaneous measures of phytoplankton photo-physiology assessed by Fast Repetition Rate Fluorometry (FRRF) in flow-through mode at the two sites across a spring-neap tidal cycle in July, 2010. The surf-zone phytoplankton was dominated by small centric and pennate diatoms as well as cyanobacteria and chlorophytes with biomass concentrations of 3.63–9.23 mg chl a m$^{−3}$. Primary productivity was relatively high, ranging from 31.5–88.0 mg C m$^{−3}$ h$^{−1}$ by $^{14}$C. Biomass-specific productivity averaged ∼9.4 mg C (mg chl a)$^{−1}$ h$^{−1}$ by $^{14}$C, indicating healthy phytoplankton populations. Measurements of the functional absorption cross section of photosystem II, σ$_{PSII}$, via FRRF were 327–380, comparable to values reported by other investigators of open ocean phytoplankton. Averaged values of the maximum effective quantum yield, F $_{v}$/F $_{m}$, corresponded to proportions of photochemically competent PSII reaction centers of 62.6 % to 72 %, indicating that the phytoplankton were nutrient-replete. These data suggest that the surf zone, although a spatially confined habitat, is a productive one that plays a significant role in coastal ocean ecology. Further investigation is needed to better understand primary productivity of phytoplankton in the surf zone and the effect of the dynamic environment on their physiological responses.
Starting Page	1393
Ending Page	1400
Page Count	8
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	35
Issue Number	6
e-ISSN	15592731
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-08-14
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Surf zone Phytoplankton Chlorophyll Production Fast repetition rate fluorometry Freshwater & Marine Ecology Coastal Sciences Nature Conservation Ecology Environmental Management Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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