The effect of salinity on the growth rate of the macroalgae Enteromorpha intestinalis (Chlorophyta) in the Mondego estuary (west Portugal)

Martins, Irene; Oliveira, José Miguel; Flindt, Mogens; Marques, João Carlos

doi:10.1016/s1146-609x(99)00140-x

Cited by 106 publications

(70 citation statements)

References 18 publications

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“…Salinity at the sites of both lowest (Haitou) and highest (Rudong) algal growth was similar (26.5 to 30.4) while salinity at Sheyang was lower and varied greatly (12.0 to 22.7) consistent with the rainfall seasonality and the close proximity (8 km) of the mouth of the Sheyang River. Salinity can affect the growth of Ulva, but they tolerate a wide range (Martins et al, 1999;Taylor et al, 2001;Nelson et al, 2008). We did not find any evidence that salinity explained Ulva biomass patterns in this study.…”

Section: Influence Of Light Ph and Salinity On Algal Biomasscontrasting

confidence: 81%

Abiotic factors influencing biomass accumulation of green tide causing Ulva spp. on Pyropia culture rafts in the Yellow Sea, China

Keesing

Chen

Shi

et al. 2016

Marine Pollution Bulletin

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a b s t r a c t a r t i c l e i n f oAnnually recurrent green-tides in the Yellow Sea have been shown to result from direct disposal into the sea of fouling Ulva from Pyropia aquaculture. The role abiotic factors play in Ulva biomass accumulation on rafts was studied to find ways to mitigate this problem. Dissolved inorganic nitrogen (DIN) was very high at all sites, but the highest Ulva biomass was associated with the lowest DIN and anthropogenic N. Under luxuriant background nutrient conditions, variability in temperature and periods of emersion, rather than pH, light and salinity determined Ulva biomass. Two dominant species of Ulva displayed differing tolerances to temperature and desiccation which helped explain why Ulva prolifera dominates floating green-tides. Rather than trying to mitigate greentides only by reducing nutrient pollution, an earlier harvest of Pyropia in southern Jiangsu Province especially before temperatures increase greatly above 10°C during April, could reduce the biomass of U. prolifera disposed from rafts.Crown

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Section: Influence Of Light Ph and Salinity On Algal Biomasscontrasting

confidence: 81%

Abiotic factors influencing biomass accumulation of green tide causing Ulva spp. on Pyropia culture rafts in the Yellow Sea, China

Keesing

Chen

Shi

et al. 2016

Marine Pollution Bulletin

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“…Sediment, water, Spartina maritima and macrofauna were collected in the southern arm of the Mondego estuary (Portugal) (see also [2,15]). The laboratory set-up made it possible to measure the aerobic and anaerobic degradation of plant material and sediment organic matter, simulating in situ high tide conditions.…”

Section: Methodsmentioning

confidence: 99%

The effect of macrofauna, meiofauna and microfauna on the degradation of Spartina maritima detritus from a salt marsh area

et al. 1999

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-Decomposition of salt marsh plants results from physical, chemical and biological processes including abiotic and biotic fragmentation, microbial decay and chemical transformation. According to literature data, only a few species have the ability to feed directly on living plant material, so fungi and bacteria seem to be the principal competitors for the organic substrates. Nevertheless, by consuming bacteria, protists and fungi associated to the detritus, macrofauna and meiofauna recycle the incorporated nutrients. Moreover, this nutrient regeneration may be seen as an effective factor in maintaining and stimulating bacterial production. In fact, it is well known that many detritus feeding species have very low assimilation efficiencies. The objective of the present study was to compare the nutrient mass balance of carbon; nitrogen and phosphorus in Spartina maritima covered areas and bare bottom sediment, with and without contribution of macrofauna, meiofauna and microbial populations. Nutrients mass balance was studied taking into account the initial and final nutrient concentrations in the sediment, water and plant material. Faunal activity was measured as a function of remineralised carbon, nitrogen and phosphorus. The experimental set-up included sixteen sub-experiments, which varied with respect to type of fauna, plant biomass and oxic status. Each sub-experiment was performed in small glass containers (3 L) containing about 900 g wwt sediment and 2.5 L estuarine water. Plant material, cut from intact plants, sediment cores and estuarine water were brought from the southern arm of the Mondego estuary (Portugal). The results showed that although the bacterial activity was responsible for the Spartina maritima degradation, the presence of meiofauna and macrofauna significantly enhanced the process. Moreover, the presence of Spartina maritima positively affected the mineralisation of the sediment carbon and nitrogen, especially when the three faunal components were present, and denitrification rates were highest in the presence of the macrofauna and meiofauna. The present study suggests that macrofauna and meiofauna have an important role on the ecosystem nutrient flux and that fauna might function as a sink for excess nutrients, that otherwise could be exported to the coastal waters. © 1999 Éditions scientifiques et médicales Elsevier SAS Spartina maritima / decomposition / fauna / nutrient mass balance

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“…This is probably a result of excessive nutrient release into the estuary, coupled with longer persistence of nutrients (nitrogen and phosphorous) in the water column [18,26,32,40]. Such macroalgal blooms may not occur in exceptionally rainy years due to the occurrence of low salinity values for long periods as a result of the Pranto river discharge [34,40].…”

Section: Study Sitementioning

confidence: 99%

Population structure, dynamics and production of Hydrobia ulvae (Pennant) (Mollusca: Prosobranchia) along an eutrophication gradient in the Mondego estuary (Portugal)

1999

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-Eutrophication in the Mondego estuary gave rise to qualitative changes in the benthic community, involving the replacement of eelgrass, Zostera noltii, by green algae such as Enteromorpha spp. and Ulva sp. It seems reasonable to assume that, through time, such changes may determine a selected new trophic structure. Hydrobia ulvae, a dominant species in terms of abundance and biomass, was studied with regard to life history, population dynamics and productivity in relation to changing environmental conditions along the eutrophication gradient. The purpose was to examine to what extent this species may adapt to the new emergent conditions. During the study period, H. ulvae population exhibited both temporal and spatial density variations. The settlement pattern did not change along the eutrophication gradient, and took place in March, June, July and September. However, the population was denser in the less eutrophied areas, corresponding to Z. noltii meadows, when compared to the eutrophied ones, where Enteromorpha spp. blooms are usually observed. Growth was continuous through life but growth rates were higher during spring, decreased from early summer to mid fall and practically ceased during winter, and then gradually increased again up to spring. Life span was estimated as 21 ± 3 months. Growth productivity (P) was estimated as 93.7 g AFDW⋅m ⋅year -1 in the strongly eutrophied area. The average annual biomass (B √ ) (standing stock) of the population was estimated as 70.2 g AFDW⋅m -2 in the Z. noltii meadows, 5.5 g AFDW⋅m -2 in the eutrophied area, and 7.4 g AFDW⋅m -2 in the strongly eutrophied area. P/B √ and E/B √ ratios were estimated as 1.3 and 4.8 in the Z. noltii meadows, 2.8 and 9.5 in the eutrophied area, and 4.5 and 13.2 in the strongly eutrophied area, respectively. As a pattern, the standing stock decreased as a function of increasing eutrophication, while P/B √ and E/B √ ratios increased following the same gradient. There is evidence that H. ulvae population structure and annual production are seriously affected by eutrophication, namely by macroalgal bloom dynamics. Moreover, results suggest that H. ulvae might be suffering a change in its adaptive strategy along the eutrophication gradient, becoming closer to a typical 'r' strategist in the strongly eutrophied areas. © 1999 Éditions scientifiques et médicales Elsevier SAS Eutrophication / Hydrobia ulvae / life cycle / population dynamics / productivity

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The effect of salinity on the growth rate of the macroalgae Enteromorpha intestinalis (Chlorophyta) in the Mondego estuary (west Portugal)

Cited by 106 publications

References 18 publications

Abiotic factors influencing biomass accumulation of green tide causing Ulva spp. on Pyropia culture rafts in the Yellow Sea, China

Abiotic factors influencing biomass accumulation of green tide causing Ulva spp. on Pyropia culture rafts in the Yellow Sea, China

The effect of macrofauna, meiofauna and microfauna on the degradation of Spartina maritima detritus from a salt marsh area

Population structure, dynamics and production of Hydrobia ulvae (Pennant) (Mollusca: Prosobranchia) along an eutrophication gradient in the Mondego estuary (Portugal)

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