Distribution of green algal mats throughout shallow soft bottoms of the Swedish Skagerrak archipelago in relation to nutrient sources and wave exposure

Pihl, Leif; Svenson, Anders; Moksnes, Per‐Olav; Wennhage, Håkan

doi:10.1016/s1385-1101(99)00004-0

Cited by 139 publications

(96 citation statements)

References 45 publications

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“…However, the C:N ratio decreased due to a relatively higher increase in nitrogen. Similar results were observed during a 3 yr study in the Swedish Skagerrak, but differences in C and N contents between sediment covered by algal mats and bare sediment were larger than in our study (Pihl et al 1999). These increases in C and N below the macroalgal mat were likely to be the result of macroalgal production itself.…”

Section: And N Contents Of the Sedimentsupporting

confidence: 90%

Effects of green macroalgal blooms on intertidal sediments: net metabolism and carbon and nitrogen contents

Corzo

Bergeijk²,

García‐Robledo³

2009

Mar. Ecol. Prog. Ser.

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Eutrophication in coastal areas promotes blooms of green macroalgae that accumulate on the sediment, affecting the exchange of mass and energy at the sediment -water interface. The effects of macroalgal blooms on the microbenthic net metabolism and on the carbon and nitrogen contents of the sediment were studied during an in situ experiment. Two sediment enclosures (with and without macroalgae) of 1.5 × 1. ). This relatively low macroalgal biomass always suppressed the photosynthetic activity of microphytobenthos, decreased the oxygen availability for the sediment and reduced the oxygen penetration depth in the light and in the dark. The microbenthic community metabolism clearly shifted to heterotrophic, while the photoautotrophic activity was located in the macroalgal canopy. This macroalgal mat was net autotrophic, and more productive than the microphytobenthic community inhabiting the bare sediment. Part of the macroalgal production was buried in the sediment, increasing its carbon and nitrogen contents with respect to bare sediment during all seasons except spring. Concentrations of inorganic nutrients in the sediment were always higher below the macroalgal mat than in bare sediment, likely due to a direct input of inorganic nitrogen and phosphate associated with macroalgal debris.

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Section: And N Contents Of the Sedimentsupporting

confidence: 90%

Effects of green macroalgal blooms on intertidal sediments: net metabolism and carbon and nitrogen contents

Corzo

Bergeijk²,

García‐Robledo³

2009

Mar. Ecol. Prog. Ser.

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“…Some of these responses to eutrophication are reversible, although recovery is likely to be a slow process, partly because of continuing internal loading from the sediment that would support algal populations (e.g. Hodgkin & Birch 1986, Richardson 1996, Pihl et al 1999. As light availability increases following a reduction in external nutrient loading, benthic primary producers once again become important and can accelerate the recovery process by reoxygenating the sediment, intercepting the sediment -water column nutrient flux, and temporarily retaining nutrients in plant biomass.…”

Section: Resultsmentioning

confidence: 99%

Eutrophication in shallow coastal bays and lagoons: the role of plants in the coastal filter

McGlathery

Sundbäck²,

Anderson³

2007

Mar. Ecol. Prog. Ser.

500

341

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“…In this study, we kept hypoxic conditions and temperature constant for the duration of 18 days, representing a chronic exposure (more than 4 days; [16]). In our study population, at the onset of the reproductive season, individuals migrate into shallow protected bays with eelgrass, where algal overgrowth is common [75] so that the water may become hyperoxic during the day owing to photosynthesis, but hypoxic at night owing to algal and plant respiration [38][39][40]57]. Thus, this population may experience hypoxic events that are high in frequency and magnitude but periodical in duration, conditions that are difficult to replicate experimentally.…”

Section: (B) Oxygenationmentioning

confidence: 99%

The evolutionary puzzle of egg size, oxygenation and parental care in aquatic environments

2015

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Offspring fitness generally improves with increasing egg size. Yet, eggs of most aquatic organisms are small. A common but largely untested assumption is that larger embryos require more oxygen than they can acquire through diffusion via the egg surface, constraining egg size evolution. However, we found no detrimental effects of large egg size on embryo growth and survival under hypoxic conditions. We tested this in the broad-nosed pipefish, Syngnathus typhle, whose males provide extensive care (nourishment, osmoregulation and oxygenation) to their young in a brood pouch on their bodies. We took advantage of this species' pronounced variation in egg size, correlating positively with female size, and tested the effect of hypoxia (40% dissolved oxygen) versus fully oxygenated (100%) water on embryo size and survival of large versus small eggs after 18 days of paternal brooding. Egg size did not affect embryo survival, regardless of O 2 treatment. While hypoxia affected embryo size negatively, both large and small eggs showed similar reductions in growth. Males in hypoxia ventilated more and males with large eggs swam more, but neither treatment affected their position in the water column. Overall, our results call into question the most common explanation for constrained egg size evolution in aquatic environments.

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Distribution of green algal mats throughout shallow soft bottoms of the Swedish Skagerrak archipelago in relation to nutrient sources and wave exposure

Cited by 139 publications

References 45 publications

Effects of green macroalgal blooms on intertidal sediments: net metabolism and carbon and nitrogen contents

Effects of green macroalgal blooms on intertidal sediments: net metabolism and carbon and nitrogen contents

Eutrophication in shallow coastal bays and lagoons: the role of plants in the coastal filter

The evolutionary puzzle of egg size, oxygenation and parental care in aquatic environments

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