Linnaeus was right all along:<i>Ulva</i>and<i>Enteromorpha</i>are not distinct genera

Hayden, Hillary S.; Blomster, Jaanika; Maggs, Christine A.; Silva, Paul C.; Stanhope, Michael J.; Waaland, J. Robert

doi:10.1080/1364253031000136321

Cited by 517 publications

(380 citation statements)

References 42 publications

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“…Two genera are especially prominent. Species of the genus Ulva, which now includes the former genus Enteromorpha 7 , are mainly responsible for green tides. The thallus (vegetative body) is only one or two cells thick but the shapes vary even within species and can be sheet-like, tubular or fern-shaped 8 .…”

mentioning

confidence: 99%

Green and golden seaweed tides on the rise

Smetacek

Zingone

2013

Nature

706

383

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mentioning

confidence: 99%

Green and golden seaweed tides on the rise

Smetacek

Zingone

2013

Nature

706

383

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“…Total DNA from silica gel-preserved thalli was extracted using the CTAB method (Doyle & Dickson, 1987), modified for 50 mg of starting material, with an initial rehydration step as described by Hayden et al (2003). Polymerase chain reaction (PCR) amplifications of the ITS1-5.8S-ITS2 (rRNA) and the chloroplast rbcL gene were performed (Shimada et al, 2003).…”

Section: Molecular Analysismentioning

confidence: 99%

Ulva flexuosa(Ulvaceae, Chlorophyta) inhabiting inland aquatic ecosystems: molecular, morphological and ecological discrimination of subspecies

Rybak

Czerwoniec²,

Gąbka

et al. 2014

European Journal of Phycology

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Species of Ulva (Ulvaceae, Chlorophyta) are relatively common macroalgae in most coastal areas. In this paper, we examine Ulva in inland aquatic ecosystems to determine relationships between the chemical parameters of the water and the Ulva taxa present. Two groups of samples of freshwater Ulva were selected from: (i) habitats with high salinity levels, and (ii) habitats with fresh or slightly saline waters. We showed that these two groups of Ulva, which occupy distinct habitats, represent two separate taxa. The first group represents Ulva flexuosa subsp. pilifera (Kützing) M.J. Wynne, which is very common and regularly encountered in fresh waters, but is equally well represented in slightly saline waters. The second is U. flexuosa subsp. paradoxa (C. Agardh) M.J. Wynne, which is less common, preferring mainly salt-wedge saline waters. We did not find both Ulva flexuosa subspecies together at any of the research sites.There were significant morphological differences between the Ulva flexuosa subspecies. Ulva flexuosa subsp. pilifera had longer and wider thalli and wider cells than those of subsp. paradoxa. Ulva flexuosa subsp. paradoxa cells were longer and of greater circumference than those of subsp. pilifera. Analyses of the rRNA ITS region and partial rbcL gene sequences demonstrated minor sequence variation within the two subspecies. The results of this study provide detailed information on the characteristics of limnic Ulva habitats and indicate the niches where such populations are likely to occur.

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“…Due to the small distance between the sites, data were put together and presented/related as mean values (GSE) for the south arm of the estuary. Green macroalgae (mostly Ulva intestinalis and Ulva compressa, according to the recent revision of Hayden et al, 2003) and the seagrass Zostera noltii, were dried (for 48 h at 60 C) and ash free dry weight (AFDW) was assessed after combustion of samples for 8 h at 450 C.…”

Section: Sampling Procedures and Analysismentioning

confidence: 99%

Management of a shallow temperate estuary to control eutrophication: The effect of hydrodynamics on the system’s nutrient loading

Lillebø

Neto

Martins

et al. 2005

Estuarine, Coastal and Shelf Science

114

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The Mondego estuary, a shallow warm-temperate intertidal system located on the west coast of Portugal, has for some decades been under severe ecological stress, mainly caused by eutrophication. Water circulation in this system was, until 1998, mainly dependent on tides and on the freshwater input of a small tributary artificially controlled by a sluice. After 1998, the sluice opening was effectively minimised to reduce the nutrient loading, and the system hydrodynamics improved due to engineering work in the upstream areas. The objective of the present study was to evaluate the effect of the mitigation measures implemented in 1998. Changes to the hydrodynamics of the system were assessed using precipitation and salinity data in relation to the concentrations of dissolved inorganic nutrients, as well as the linkage between dissolved N:P ratios and the biological parameters (phytoplankton chlorophyll a concentrations, green macroalgal biomass and seagrass biomass). Two distinctive periods were compared, over a ten year period: from January 1993 to January 1997 and from January 1999 until January 2003. The effective reduction in the dissolved N:P atomic ratio from 37.7 to 13.2 after 1998 is a result of lowered ammonia, but not the oxidised forms of nitrogen (nitrate plus nitrite), or increased concentrations of dissolved inorganic phosphorus. Results suggest that the phytoplankton is not nutrient limited, yet maximum and mean biomass of green macroalgae was reduced by one order of magnitude after the mitigation measures. This suggests that besides lowering the water residence time of the system, macroalgal growth became nitrogen limited. In parallel to these changes the seagrass-covered area and biomass of Zostera noltii showed signs of recovery.

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Linnaeus was right all along:UlvaandEnteromorphaare not distinct genera

Cited by 517 publications

References 42 publications

Green and golden seaweed tides on the rise

Green and golden seaweed tides on the rise

Ulva flexuosa(Ulvaceae, Chlorophyta) inhabiting inland aquatic ecosystems: molecular, morphological and ecological discrimination of subspecies

Management of a shallow temperate estuary to control eutrophication: The effect of hydrodynamics on the system’s nutrient loading

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