Nitrogen ecophysiology of intertidal seaweeds from New Zealand: N uptake, storage and utilisation in relation to shore position and season

Phillips, J. Neal; Hurd, Catriona L.

doi:10.3354/meps264031

Cited by 70 publications

(60 citation statements)

References 79 publications

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“…This can explain the dominance of Ulva species in this study during winter which led to the highest total biomass of green algae in this season along the eastern coast of Qeshm Island. Ulva species are among the fast-growing algae (Phillips and Hurd 2003) and showed differences over time, being abundant in winter and early spring then vanishing in summer, which may be attributable to the seasonal fluctuation of nutrient supplies in seawater in the study area.…”

Section: Discussionmentioning

confidence: 99%

Zonation patterns, composition and diversity of macroalgal communities in the eastern coasts of Qeshm Island, Persian Gulf, Iran

et al. 2016

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This study investigates the spatial and temporal variation of intertidal macroalgae along the eastern coasts of Qeshm Island, Persian Gulf, Iran. Monthly sampling of abundance, biomass, richness and diversity of macroalgae at three intertidal levels was carried out at two different sites during 1 year. The samples were collected every month using quadrats (0.5 × 0.5 m) from October 2012 to September 2013. The species dry weight was applied to examine changes in biomass and assemblage composition of intertidal macroalgae using univariate and multivariate analyses. A total of 42 seaweed species (10 Chlorophyta, 9 Phaeophyceae, and 23 Rhodophyta) were identified. The results confirmed a temporal pattern in the growth of the algal species which also showed a biomass zonation pattern from upper to lower intertidal. The annual mean biomass of macroalgae was highest in winter (29.3 ± 9.8 g dry wt m−2 ) and the lowest in autumn (17.3 ± 13.5 g dry wt m−2 ). The annual dominant species by biomass was Padina sp. followed by Padina australis. The most common species in the area, during the sampling period include Ulva intestinalis, Ulva lactuca, Palisada perforata and Padina sp. According to the similarity percentages analysis (SIMPER), the species Ulva intestinalis, Dictyosphaeria cavernosa (Chlorophyta), Padina australis (Phaeophyceae), Champia spp., Centroceras clavulatum and Palisada perforata (Rhodophyta) were responsible for the most dissimilarity of species composition between four seasons during the sampling period. BIOENV analysis indicated that the main environmental factors structuring macroalgal community at the study area were TDS and pH. The simple macroalgae community on the eastern coast of Qeshm Island and absence of slow-growing perennial macroalgae, such as members of the Sargassaceae, known from the lower shore at other intertidal localities along the island's coast might relate to the predominantly unsuitable sandy-stony substrates unsuitable for their colonization and the unfavourable impact upon them of urbanization.

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Section: Discussionmentioning

confidence: 99%

Zonation patterns, composition and diversity of macroalgal communities in the eastern coasts of Qeshm Island, Persian Gulf, Iran

et al. 2016

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“…To investigate preference for different substrates, many authors (Fan et al 2003, Phillips & Hurd 2003, Weston et al 2004, Bode et al 2005 have used the relative preference index (RPI) (McCarthy et al 1977), defined as (1) where RPI x = relative preference index of Substrate x, U x = uptake rate of Substrate x, C x = concentrations of Substrate x and and ΣU and ΣC = the summed uptake and concentration, respectively, for all substrates (i.e. different substrates is shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Uptake of dissolved inorganic nitrogen, urea and amino acids in the Scheldt estuary: comparison of organic carbon and nitrogen uptake

Andersson¹,

Rijswijk²,

Middelburg³

2006

Aquat. Microb. Ecol.

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Uptake of dissolved ammonium, nitrate, nitrite, urea and amino acids was studied in the Scheldt estuary in different seasons over a salinity gradient. The importance of inorganic nitrogen sources was compared to that of urea and amino acids and the relative use of urea and amino acid nitrogen and carbon was studied. Urea and amino acids constituted up to 43 and 29% of total nitrogen uptake, respectively, and were of similar importance as inorganic substrates. Ammonium oxidation by nitrifiers and ammonium uptake by algae and bacteria were of similar magnitude. In January, April and November, amino acids constituted a source of both nitrogen and carbon while urea mainly constituted a source of carbon. During the summer months, amino acids were used mainly as a source for nitrogen, while urea was a source for both carbon and nitrogen; urea was rarely used as nitrogen substrate alone. Due to this seasonal uncoupling of nitrogen and carbon assimilation, dually labeled substrates are necessary to assess the importance of urea and amino acids as substrates for organic nitrogen and carbon.

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“…Chapman & Craigie 1977, Hatcher et al 1977, Gerard 1982, Gomez & Wiencke 1998, Phillips & Hurd 2003. For example, when light is abundant and growth is limited by nitrogen, excess photosynthate is stored as mannitol and laminarin, which are mobilized to support growth when conditions switch to nutrient sufficiency but light limitation.…”

Section: Introductionmentioning

confidence: 99%

Differences in growth, morphology and tissue carbon and nitrogen of Macrocystis pyrifera within and at the outer edge of a giant kelp forest in California, USA

Stewart

Fram

Reed

et al. 2009

Mar. Ecol. Prog. Ser.

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To investigate the extent to which alteration of physical factors by giant kelp beds affects the growth of kelp within the bed, we conducted analyses of frond morphometrics at 2 mo intervals, elongation rates and tissue chemistry of individuals of Macrocystis pyrifera on the interior and edge of a kelp bed off the coast of Santa Barbara, California, USA. The density of the kelp canopy varied greatly during the 13 mo study, ranging from 0.03 to 8.03 m 2 blade tissue m -2 sea surface. Time series analysis of flow velocity, light, temperature and seawater nitrate concentrations inside and outside of the bed indicated that when canopy density was high (May to September) current speeds in the bed were 25% of incident flow, and light below the canopy (at 1 m depth) was reduced to 10% surface irradiance. Nitrate concentrations were highly variable and similar between inside and outside moorings. When the canopy was well developed, kelp fronds on the seaward edge of the bed had faster elongation rates and larger blades, resulting in higher overall growth rates (mass added per day) than interior fronds. Carbon and nitrogen accumulation by edge fronds was also higher during this period, which fueled growth rates of edge fronds that were nearly twice as high as interior fronds when the canopy was densest. Thus, the growth and tissue chemistry of M. pyrifera within the kelp bed depended on the extent to which the bed modified ambient physical conditions. KEY WORDS: Kelp bed · Macrocystis pyrifera · Ecosystem engineering · Growth · Morphology · Nitrogen · Carbon · Light · Water flow Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 375: [101][102][103][104][105][106][107][108][109][110][111][112] 2009 with flow can attenuate currents and internal waves (Jackson & Winant 1983, Jackson 1984, 1997, Gaylord et al. 2007, Fram et al. 2008). As such, giant kelp is a classic autogenic ecosystem engineer (sensu Jones et al. 1994), altering physical conditions by its presence and creating habitats very distinct from adjacent waters. However, giant kelp beds are dynamic systems, and the extent to which they modify their surrounding physical environment is a function of their areal extent and the density of individuals within them, which change with seasonal and inter-annual variability in nearshore physical conditions.Patterns of productivity and abundance of Macrocystis pyrifera off the coast of California are influenced by seasonal changes in light, water motion and nitrate availability (Dayton & Tegner 1984, Dayton et al. 1992, Edwards & Estes 2006. The abundance of kelp in turn influences these physical processes in and around a kelp bed. For example, giant kelp canopies, which in southern California tend to be densest in summer when ambient seawater nitrate concentrations are typically lowest, can retard currents and reduce the amount of nitrate delivered to the bed interior (Jackson 1997, Gaylord et al. 2007, Fram et al. 2008. Similarly, light availability within a kelp b...

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Nitrogen ecophysiology of intertidal seaweeds from New Zealand: N uptake, storage and utilisation in relation to shore position and season

Cited by 70 publications

References 79 publications

Zonation patterns, composition and diversity of macroalgal communities in the eastern coasts of Qeshm Island, Persian Gulf, Iran

Zonation patterns, composition and diversity of macroalgal communities in the eastern coasts of Qeshm Island, Persian Gulf, Iran

Uptake of dissolved inorganic nitrogen, urea and amino acids in the Scheldt estuary: comparison of organic carbon and nitrogen uptake

Differences in growth, morphology and tissue carbon and nitrogen of Macrocystis pyrifera within and at the outer edge of a giant kelp forest in California, USA

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