Wastewater discharge, seagrass decline and algal proliferation on the côte d'Azur

Chisholm, John R. M.; Fernex, F.; Mathieu, Daniel; Jaubert, Jean

doi:10.1016/s0025-326x(96)00072-0

Cited by 48 publications

(45 citation statements)

References 13 publications

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“…Our findings are in contrast to some others (Chisholm et al, 1997;Jaubert et al, 2003) suggesting that, due to a high content of organic matter associated with urban pollution, sediment conditions promote the growth of invasive Caulerpa species. In accordance with recent laboratory experiments (Terrados & Marba`, 2006) our results do not support more efficient growth or facilitate survival of C. racemosa due to higher organic matter content of the sediment.…”

Section: Discussioncontrasting

confidence: 99%

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Caulerpa racemosa: adaptive varieties studied by fatty acid composition (Northern Adriatic Sea, Vrsar, Croatia)

Blažina

Iveša

Najdek

2009

European Journal of Phycology

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Total lipids and fatty acid composition were monitored seasonally in exposed and sheltered Caulerpa racemosa settlements along the coast of St Juraj island (Vrsar, Croatia). The underlying sediment in the exposed area was characterized by a lower content of total lipids (0.63 AE 0.18 mg/g d.w.) and coarser grain sizes (median particle diameter [Md] ¼ 1319.5 mm) in comparison to sediment of the sheltered area (0.89 AE 0.06 mg/g d.w.; Md 378.9 mm). Despite the proximities of both populations studied, and, hence, both experiencing similar exposure to seasonal fluctuations, the algal responses were different. Total lipid changes and fatty acid composition of the related settlements indicated the differences in thallus condition during summer of 2004 and to some extent different strategies in cold adaptation during winter 2005. In August 2004, the bad condition of thalli at the sheltered site, expressed by low unsaturation (UNS/SAT 0.45), resulted from its sexual propagation state, in contrast to the advanced condition of vegetative propagation state at the exposed site (UNS/SAT 1.1). The poor thallus condition was related to its slower development at the sheltered habitat, having correspondingly lower biomass. Furthermore, at this site little or no difference in total lipids was observed with season. During the winter period (min. temp. 7.7 C) both settlements altered their fatty acid composition by increasing unsaturation (UNS/SAT up to 1.8), but a pronounced winter peak in total lipids occurred at the exposed site. Under similar environmental conditions, the C. racemosa in this study developed different strategies in cold adaptation and propagation state as a consequence of apparently varying impact of the hydrodynamism at these two proximate sites. This study suggests the mode in which exposure impacts the growth cycle of C. racemosa in temperate regions.

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Section: Discussioncontrasting

confidence: 99%

“…The colour changes of the thalli enable visual recognition of sexual reproduction in the field (Clifton & Clifton, 1999). Among beneficial factors promoting the growth of Caulerpa species, substrata enriched with organic matter have also been suggested (Chisholm et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Caulerpa racemosa: adaptive varieties studied by fatty acid composition (Northern Adriatic Sea, Vrsar, Croatia)

Blažina

Iveša

Najdek

2009

European Journal of Phycology

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“…Anthropogenic nutrient inputs are considered the most significant factor contributing to the global increase in the frequency and intensity of HABs (Hallegraeff 2004;Glibert et al 2005). Although many studies have focused on agricultural runoff, wastewater has also been found to promote HABs and increase primary productivity (Jaubert et al 2003); in some regions, wastewater has been shown to be more important than upwelling as a N source (Chisholm et al 1997; Thompson and Waite 2003;Lapointe et al 2005).…”

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confidence: 99%

Anthropogenic nutrient sources rival natural sources on small scales in the coastal waters of the Southern California Bight

Howard

Sutula

Caron

et al. 2014

Limnology & Oceanography

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Anthropogenic nutrients have been shown to provide significant sources of nitrogen (N) that have been linked to increased primary production and harmful algal blooms worldwide. There is a general perception that in upwelling regions, the flux of anthropogenic nutrient inputs is small relative to upwelling flux, and therefore anthropogenic inputs have relatively little effect on the productivity of coastal waters. To test the hypothesis that natural sources (e.g., upwelling) greatly exceed anthropogenic nutrient sources to the Southern California Bight (SCB), this study compared the source contributions of N from four major nutrient sources: (1) upwelling, (2) treated wastewater effluent discharged to ocean outfalls, (3) riverine runoff, and (4) atmospheric deposition. This comparison was made using large regional data sets combined with modeling on both regional and local scales. At the regional bight-wide spatial scale, upwelling was the largest source of N by an order of magnitude to effluent and two orders of magnitude to riverine runoff. However, at smaller spatial scales, more relevant to algal bloom development, natural and anthropogenic contributions were equivalent. In particular, wastewater effluent and upwelling contributed the same quantity of N in several subregions of the SCB. These findings contradict the currently held perception that in upwelling-dominated regions anthropogenic nutrient inputs are negligible, and suggest that anthropogenic nutrients, mainly wastewater effluent, can provide a significant source of nitrogen for nearshore productivity in Southern California coastal waters.

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“…Proliferation of Caulerpa taxifolia (a tropical green alga) was first noted in the Mediterranean in 1984 (Meinesz and Hesse 1991), and is considered potentially dangerous to that region's native seagrass meadows. These fears have been somewhat reduced by observations that algae appear to be successful colonizers only in polluted environments where seagrass vitality is poor, or in sparse meadows (DeVillèle and Verlaque 1995;Chisholm et al 1997;Hemminga and Duarte 2000).…”

Section: Invasive Speciesmentioning

confidence: 99%

Coastal Habitats of the Gulf of Mexico

Mendelssohn

Byrnes

Kneib

et al. 2017

Habitats and Biota of the Gulf of Mexico: Before the Deepwater Horizon Oil Spill

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Wastewater discharge, seagrass decline and algal proliferation on the côte d'Azur

Cited by 48 publications

References 13 publications

Caulerpa racemosa: adaptive varieties studied by fatty acid composition (Northern Adriatic Sea, Vrsar, Croatia)

Caulerpa racemosa: adaptive varieties studied by fatty acid composition (Northern Adriatic Sea, Vrsar, Croatia)

Anthropogenic nutrient sources rival natural sources on small scales in the coastal waters of the Southern California Bight

Coastal Habitats of the Gulf of Mexico

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