Nitrate uptake and storage in the seaweed Ulva rigida C. Agardh in relation to nitrate availability and thallus nitrate content in a eutrophic coastal lagoon (Sacca di Goro, Po River Delta, Italy)

Naldi, Mariachiara; Viaroli, Pierluigi

doi:10.1016/s0022-0981(01)00387-2

Cited by 84 publications

(65 citation statements)

References 47 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: 83%

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: 83%

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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“…Seasonal changes in temperature, light in the water column, and nutrients (especially, nitrogen) are known as important variables regulating Ulva growth in the green tide (Ménesguen & Piriou, 1995;Sfriso, 1995;Riccardi & Solidoro, 1996;Viaroli et al, 1996b;Yamasaki et al, 1996;Malta & Verschuure, 1997;De Casabianca & Posada, 1998;Naldi & Viaroli, 2002). In our study, water temperature was the most correlated variable among the other environmental variables with the RGRs for both types of Ulva.…”

Section: Discussionsupporting

confidence: 56%

“…in our study, U. armoricana was described as a new species in France (Dion et al, 1998) and is considered to have been introduced to Japan (Shimada et al, 2003). European species of Ulva have a relatively lower optimal temperature (10-20°C) for growth and photosynthesis than Japanese species (20-30°C) (Murase et al, 1993;De Casabianca & Posada, 1998;Taylor et al, 2001), and exhibit the highest growth or peak in biomass in spring to early summer (Sfriso, 1995;Viaroli et al, 1996b;De Casabianca & Posada, 1998;Naldi & Viaroli, 2002). These ecophysiological and seasonal characteristics do not correspond with those of Ulva spp.…”

Section: Discussionmentioning

confidence: 69%

“…In our results, DIP was selected as a correlated variable on the RGR of U. pertusa cultured in the cages. In many previous reports in temperate regions, nitrogen has been indicated to be more important than phosphorus, which limits algal growth and production Ménesguen & Piriou, 1995;Rivers & Peckol, 1995;Fong et al, 1996;Viaroli et al, 1996b;Malta & Verschuure, 1997;Sfriso & Marcomini, 1997;Naldi & Viaroli, 2002). For now, we are not sure if summer growth of U. pertusa is phosphorus-limited in Hiroshima Bay, but it is possible that growth of U. pertusa is influenced more seriously by nutrient shortage in summer than Ulva spp.…”

Section: Discussionmentioning

confidence: 86%

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Persistent occurrence of floating Ulva green tide in Hiroshima Bay, Japan: seasonal succession and growth patterns of Ulva pertusa and Ulva spp. (Chlorophyta, Ulvales)

Yoshida

Uchimura²,

Hiraoka

2015

Hydrobiologia

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Since the late 1980's, a persistent green tide of floating Ulva without any clear seasonal fluctuation has occurred in Hiroshima Bay, Seto Inland Sea, Japan. We hypothesized that the persistence is due to the co-existence of Ulva species with different seasonal growth patterns, and monitored the seasonal composition and growth characteristics of the constituent Ulva within the green tide. Two morphological types of Ulva were identified, and one type, U. pertusa, was almost the sole constituent during winter and spring. The other type Ulva spp., which has marginal microscopic serrations on the thallus, was dominant during summer and autumn. Both Ulva showed the highest relative growth rate in early autumn, but growth of Ulva spp. was faster in summer than that of U. pertusa and inhibited in winter. U.pertusa had more eurythermal characteristics in which the growth rate remained relatively high in winter. Water temperature was the most correlated environmental variable for the seasonal growth of both Ulva types rather than light or nutrients, but more influential on Ulva spp. Recent increasing trend of ambient seawater temperature is considered to be favorable for the growth of both Ulva types and a causative factor of the green tide.

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“…Se caracterizan por absorber de manera eficiente el nitrógeno, incluso a bajas concentraciones (Hein et al, 1995.;Pedersen & Borum, 1997.;Naldi, 2002). Así mismo, tienen la capacidad de almacenar reservas de nitrógeno en las células aprovechando episodios periódicos de alta disponibilidad de nitrógeno, que se producen en muchos ambientes costeros, como mencionan Fong et al (1994), y Peckol et al (1994), llegando a ser importantes productores primarios en ensenadas costeras o las causantes de desalojar otras especies.…”

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EFECTO DE Ulva spp. SOBRE EL CRECIMIENTO Y SUPERVIVENCIA DE Argopecten purpuratus EN LA BAHÍA DE PARACAS

Castro¹,

Mendo

2014

Ecol. apl.

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ResumenEste estudio compara el crecimiento y supervivencia de Argopecten purpuratus (Lamarck, 1819) "concha de abanico" sembradas con diferentes densidades de Ulva spp., Linnaeus, 1753 en la bahía Paracas (Ica-Perú) durante el 7 agosto al 16 de octubre del 2011. Para ello se instalaron tres corrales cada uno con tres unidades experimentales de 1m 2 y en cada unidad se sembraron conchas de abanico de 40-50mm de altura a una densidad de 60 individuos/m 2 . En dos de los corrales se sembró Ulva spp., con 10 (T2) y 20 (T3) kg/m 2 y el tercer corral fue considerado como testigo (T1), es decir, sin Ulva spp. Para evaluar el crecimiento, cada dos semanas se extrajeron al azar 10 individuos por cada repetición (30 por tratamiento) y se registró la altura y el peso seco del soma y la gónada. La supervivencia se evaluó contando los individuos muertos en periodos variables. Adicionalmente cada 30 minutos durante todo el experimento se registró la temperatura y oxígeno del fondo y diariamente el pH, conductividad y corrientes se registraron en una zona media a los tratamientos. La clorofila a se registró diariamente, para cada tratamiento.Los resultados indican que la supervivencia, el crecimiento en altura y peso se vieron afectados por la presencia de Ulva spp. La concentración de oxígeno y clorofila a, mostraron mayores valores en los tratamiento con presencia de Ulva spp. Se concluyó que densidades mayores a 20 kg de Ulva spp./m 2 , afectan el crecimiento y supervivencia de Argopecten purpuratus, por lo que se recomienda su extracción. Palabras clave: Argopecten purpuratus, Ulva spp., crecimiento, supervivencia, bahía Paracas, Perú. AbstractThis study compares the growth and survival of juvenile Argopecten purpuratus (Lamarck, 1819) seeded with different densities of Ulva spp., in the bay of Paracas (Ica-Peru) between August 7 and October 16, 2011. For this purpose, three pens were installed each with three experimental units of 1m 2 and each experimental unit had a density of 60 scallops /m 2 , with an average height of 40-50mm. In two of the pens Ulva spp., was introduced with 10 (T2) and 20 (T3) kg/m 2 and the third was considered witness (T1), ie without Ulva spp. To assess growth, every two weeks 10 scallops for each repetition (30 in each treatment) were randomly extracted their individual height was recorded and dry weight and gonad somatic tissue were sampled. Survival was assessed by counting the dead individuals in varying periods. During the entire experiment temperature and bottom oxygen were assessed every 30 minutes while pH, conductivity and currents were daily assessed at noon in the treatments middle zone. Chlorophyll a was measured daily, for each treatment. The results indicate that survival, height and weight were affected by the presence of Ulva spp. Oxygen concentration and chlorophyll a, showed higher concentration in the presence of Ulva spp. It was concluded that higher than 20 kg spp./m2 densities of Ulva affect growth and survival of A. purpuratus, so a removal is recommended. Key words: Argop...

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Nitrate uptake and storage in the seaweed Ulva rigida C. Agardh in relation to nitrate availability and thallus nitrate content in a eutrophic coastal lagoon (Sacca di Goro, Po River Delta, Italy)

Cited by 84 publications

References 47 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

Persistent occurrence of floating Ulva green tide in Hiroshima Bay, Japan: seasonal succession and growth patterns of Ulva pertusa and Ulva spp. (Chlorophyta, Ulvales)

EFECTO DE Ulva spp. SOBRE EL CRECIMIENTO Y SUPERVIVENCIA DE Argopecten purpuratus EN LA BAHÍA DE PARACAS

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