Macroalgal Bloom Dynamics in a Highly Eutrophic Southern California Estuary

Kamer, Krista; Boyle, Karleen A.; Fong, Peggy

doi:10.2307/1353262

Cited by 77 publications

(40 citation statements)

References 41 publications

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“…Uptake of NH 4 + allowed a closer convergence to fertilizer δ 15 N, which suggests affinity for NH 4 + rather than NO 3 -in both species, and indicates that both may assimilate NH 4 + faster than NO 3 -. Similar results have been found in laboratory incubation experiments with Ulva fenestrata, Gracilaria pacifica (Naldi & Wheeler 2002), and U. intestinalis (Cohen & Fong 2004 (Sfriso et al 1992, Naldi & Viaroli 2002, upper Newport Bay estuary, California, USA (Kamer et al 2001), and Port Phillip Bay, Australia (Campbell 2001).…”

Section: Internal Nutrient Poolssupporting

confidence: 84%

Macroalgal responses to experimental nutrient enrichment in shallow coastal waters: growth, internal nutrient pools, and isotopic signatures

Teichberg¹,

Fox²,

Aguila³

et al. 2008

Mar. Ecol. Prog. Ser.

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Increased nutrient inputs to temperate coastal waters have led to increased occurrences of macroalgal blooms worldwide. To identify nutrients that are limiting to macroalgae and to determine whether different forms of these nutrients and long-term ambient nutrient conditions affect macroalgal response, we used in situ enrichment methods and tested the response of 2 bloom-forming species of macroalgae, Ulva lactuca and Gracilaria tikvahiae, from shallow estuaries of Waquoit Bay, Massachusetts, USA, that receive different land-derived N inputs. We enriched caged macroalgal fronds with nitrate, ammonium, phosphate, and N + P combinations, and measured growth, nutrient content, and δ 15 N signatures of fronds after 2 wk of incubation. In these estuaries, P did not limit growth, however, the 2 species differed in growth response to N additions. Growth of U. lactuca was greater in Childs River (CR), the estuary with higher nitrate inputs, than in Sage Lot Pond (SLP); growth in SLP increased with nitrate and ammonium enrichment. In contrast, growth of G. tikvahiae was greater in SLP than in CR, but had no growth response to N enrichment in either site. C and N contents differed initially between species and sites, and after nutrient enrichment. Final tissue % N increased and C:N decreased after nitrate and ammonium enrichment. δ 15 N values of the macroalgae demonstrated uptake of the experimental fertilizers, and a higher affinity and faster turnover of internal N pools with ammonium than nitrate enrichment in both species. We suggest that U. lactuca blooms in areas with both high nitrate and ammonium water column concentrations, and is more N-limited in oligotrophic waters where DIN levels are too low to sustain high growth rates. G. tikvahiae has a greater N storage capacity than U. lactuca, which may allow it to grow in less nutrientrich waters.

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Section: Internal Nutrient Poolssupporting

confidence: 84%

Macroalgal responses to experimental nutrient enrichment in shallow coastal waters: growth, internal nutrient pools, and isotopic signatures

Teichberg¹,

Fox²,

Aguila³

et al. 2008

Mar. Ecol. Prog. Ser.

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“…Total phosphorus was calculated as the sum of different fractions obtained from sequential extractions [14]. About 1 g of the sediments was carefully digested with a tri-acid mixture (HClO 4 , HNO 3 , and HCl in a ratio of 1:1:3), and total iron concentrations were determined by atomic absorption spectrophotometry (Perkin-Elmer, 3110). The accuracy of the analytical procedures for total iron determination was checked using BCSS-1 (standard reference material for marine and estuarine sediments).…”

Section: Methodsmentioning

confidence: 99%

“…Estuaries are particularly vulnerable to such input changes because of the limited water exchange [3]. Sediments effectively trapped by estuarine circulation processes [4] may be eroded, transported, and deposited many times before they accumulate below the actively reworked surface layer [5].…”

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of surficial sediments in a tropical estuary, south-west India

Renjith

Chandramohanakumar

2007

Chemistry and Ecology

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Geochemical characteristics of surficial sediments in the Panangad region of Cochin estuary, the largest brackish-water humid ecosystem in the south-west coast of India, were analysed. Temporal variations in nutrient stoichiometry, seasonal characteristics of redox elements Fe and S, and the phosphorus geochemistry were employed for the purpose. The stoichiometric analysis pointed towards autochthonous origin of organic matter, possibility of nitrogen limitation, and allochthonous modification of redox conditions. Seasonal variations were not statistically significant for all the geochemical parameters, whereas significant spatial variations were observed with lower values at sandy stations, suggesting that the texture of the sediments is the main factor influencing the sediment geochemistry. Significant inter-relations between the geochemical parameters also suggest a common control mechanism. Based on these geochemical characteristics, the study region can be effectively categorized into two distinct zones, viz. (1) erosion and transportation and (2) deposition zones.

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“…They cause nuisance blooms in lakes and shallow marine areas when general conditions for algal growth become favourable, e.g. by increased nutrient availability (Kamer et al 2001, Gordillo et al 2003 or increased water temperature (Snoeijs & Prentice 1989). In a wide ecological sense, these shortlived, fast-growing easy colonisers are classified as r-strategists.…”

Section: Discussionmentioning

confidence: 99%

Photosynthesis, carbon uptake and antioxidant defence in two coexisting filamentous green algae under different stress conditions

Choo¹,

Nilsson²,

Pedersén³

et al. 2005

Mar. Ecol. Prog. Ser.

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The physiological basis for ecological processes is in many cases little understood. The purpose of this work was to link 3 important physiological processes in algae -photosynthesis, carbon uptake and antioxidant defence -to life form. The organisms used were the morphologically similar filamentous green algal species Cladophora glomerata and Ulva procera, which seemingly occupy the same niche when they co-occur in dense belts in the upper littoral zone of the brackish Baltic Sea in summer. Their life strategies are different: the annual C. glomerata usually stays attached throughout summer, while the ephemeral U. procera can appear and disappear from the same site from week to week. The algae were growing in the field under exactly the same conditions (mixed stands) and were immediately used in experiments at a field station. Fundamental ecophysiological differences were found between the 2 species. (1) Higher photosynthetic activity was detected in U. procera. (2) More shade-adaptations were found in U. procera, and more sun-adaptations in C. glomerata. (3) C. glomerata uses a proton pump for HCO 3 -transport, and carbon uptake does not depend on periplasmic carbonic anhydrase. This is an advantage in dense algal belts with longer periods of carbon limitation. (4) C. glomerata invests more in carotenoid protection against oxidative stress, including high carotenoid/chlorophyll ratios and a functional violaxanthin xanthophyll cycle. (5) U. procera was more sensitive to oxidative stress created by UV-B radiation than C. glomerata, which correlates with a more effective intracellular (carotenoid and enzymatic) defence against oxidative stress in C. glomerata. (6) H 2 O 2 in the seawater medium had a negative effect on photosynthesis in C. glomerata, but not in U. procera. This suggests that a high release of H 2 O 2 by U. procera under oxidative stress may damage C. glomerata. While the ecophysiological traits of C. glomerata seem to be directed toward persistence, those of U. procera seem to be more engaged with large but short-term gains. This is in accordance with their different life strategies.

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Macroalgal Bloom Dynamics in a Highly Eutrophic Southern California Estuary

Cited by 77 publications

References 41 publications

Macroalgal responses to experimental nutrient enrichment in shallow coastal waters: growth, internal nutrient pools, and isotopic signatures

Macroalgal responses to experimental nutrient enrichment in shallow coastal waters: growth, internal nutrient pools, and isotopic signatures

Geochemical characteristics of surficial sediments in a tropical estuary, south-west India

Photosynthesis, carbon uptake and antioxidant defence in two coexisting filamentous green algae under different stress conditions

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