Induction of larval settlement in the polychaete Hydroides elegans by extracellular polymers of benthic diatoms

Lam, Cindy; Harder, Tilmann; Qian, Pei‐Yuan

doi:10.3354/meps286145

Cited by 54 publications

(41 citation statements)

References 39 publications

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“…In contrast, we observed N. constricta to exhibit high growth rates at lower salinities. Similar results to ours were obtained by Lam et al (2005) and Pasztaleniec & Polec´(2006), whereas Kashima et al (1997) described N. constricta as having an optimum salinity between 25 and 56. However, different growth responses among clones of the same diatom species have been observed by different authors (e.g.…”

supporting

confidence: 91%

Compatible solutes in three marine intertidal microphytobenthic Wadden Sea diatoms exposed to different salinities

Scholz

Liebezeit

2012

European Journal of Phycology

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Diatoms inhabiting intertidal flats are subject to strongly changing salinities due to exposure to rain and desiccation at low tide. In order to determine the physiological responses of marine benthic diatoms to salinity changes, cultures of Navicula phyllepta, Achnanthes delicatula subsp. hauckiana and Nitzschia constricta, isolated from the Soltho¨rn tidal flat (lower Saxony, southern North Sea), were used to study the effect on growth rates of different salinities (0.5, 10, 20, 30, 40, 50). During short (1, 3, 10, 60 min) and long exposures (30 days), the composition of free amino acids and the accumulation of polyols, saccharides, quaternary ammonium compounds and -dimethylsulphoniopropionate (DMSP) were determined. The growth rates of N. phyllepta were not affected by salinity in the tested range, synthesizing and accumulating proline as the only response to salinity increases in the growth medium. The growth responses of A. delicatula subsp. hauckiana were significantly weaker at the lowest and highest salinities in comparison to the control treatment (at a salinity of 30), producing proline, glycine betaine, glycerol and the quaternary ammonium compound homarine. In contrast, N. constricta showed the highest growth rate in the low-salinity treatment and the lowest proline concentrations in the high-salinity assay in comparison to the other species. In addition, N. constricta was the only species that synthesized the tertiary sulphonium compound DMSP. Furthermore, results from the salinity treatments showed particular similarities in compound accumulation. While quaternary ammonium compounds as well as DMSP were synthesized during high-salinity treatments, polyols and carbohydrates were found predominantly in the low-salinity experiments. Enzyme activities specific to proline metabolism in A. delicatula and N. constricta indicated that the high salinity-induced free proline accumulation may be due to a stimulation of synthesis via the ornithine pathway, whereas in N. phyllepta the glutamate pathway may contribute significantly to the free proline accumulation. In conclusion, significant differences in osmolyte compositions were found in the three diatom species during exposure to different salinities, suggesting specific intracellular acclimation processes that provide possible explanations of the species' insensitivity towards environmental short-time salinity variations.

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confidence: 91%

Compatible solutes in three marine intertidal microphytobenthic Wadden Sea diatoms exposed to different salinities

Scholz

Liebezeit

2012

European Journal of Phycology

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“…The formation of biofilm is very important for the adhesion of subsequent fouling organisms. The studies had proved that bacterial biofilm of Pseudoalteromonas spongiae was associated with its induction of larval settlement of the polychaete Hydroides elegans and the settlement was correlated with bacterial density (Lau et al, 2005;Huang et al, 2007), and the reports suggested that the extracellular polymers of benthic diatoms induced larval settlement in the polychaete Hydroides elegans (Lam et al, 2003(Lam et al, , 2005. Similarly, bacterial biofilm promoted the settlement of Ulva spores and Balanus improvisus cyprid (Joint et al, 2002;Tait and Havenhand, 2013).…”

Section: Discussionmentioning

confidence: 99%

Indole derivatives inhibited the formation of bacterial biofilm and modulated Ca2+ efflux in diatom

Yang

Yin

Sun

et al. 2014

Marine Pollution Bulletin

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“…The larva of H. elegans is an excellent model to study the mechanisms underlying settlement cue detection during the habitat selection process (reviewed by Qian 1999). This species is also particularly suitable for examining the relationships among environmental conditions, biofilm dynamics and larval settlement (Lam et al 2005).The role of UVR on biofilms, and consequently on the larval settlement, has as yet not been broadly investigated. In this study, we exposed sublittoral multispecies biofilms to UVR and then examined the films' ability to induce the settlement of Hydroides elegans larvae under both laboratory and field conditions.…”

mentioning

confidence: 99%

Effect of ultraviolet radiation on biofilms and subsequent larval settlement of Hydroides elegans

Hung¹,

Thiyagarajan²,

Wu³

et al. 2005

Mar. Ecol. Prog. Ser.

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This study investigated the effect of UV-A and B (UVR) on larval settlement of the polychaete Hydroides elegans through their influence on biofilms. Multispecies biofilms were treated with 3 doses of UVR (10, ) at 2 environmentally realistic irradiance levels (4 and 2 W m -2 ) in the laboratory, and their ability to induce the settlement of H. elegans larvae was then examined in both laboratory and field conditions. For the field experiment, only 10 and 80 KJ m -2 doses under 4 W m -2 were used. In addition, this study evaluated the effects of UVR on monospecies bacterial biofilms and then their ability to induce larval settlement in the laboratory. Results demonstrated that the ability of multispecies biofilms to trigger larval settlement could be compromised as a result of enhanced UVR exposure. Although larval settlement on multispecies biofilms treated with the lowest UV dose (at both irradiance levels) was at the same level as that of the control, the exposure of biofilms to the highest dose significantly reduced their larval settlement triggering ability. Furthermore, UVR treatments decreased the percentage of metabolically active bacterial cells in monospecies biofilms; the effect increased with increasing UV dose. Larval settlement response to monospecies biofilms decreased with increasing UV dose, suggesting that the bacterial metabolic activity in biofilms is essential for the biofilms to have an inductive effect on larval settlement. This study suggests that enhanced UVR, which might occur due to ozone depletion, may have a significant effect on the larval settlement of H. elegans by affecting a biofilm's inductive cues. KEY WORDS: Hydroides elegans · Larval settlement · Biofilms · Ultraviolet radiation Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 304: [155][156][157][158][159][160][161][162][163][164][165][166] 2005 induce larval settlement. Consequently, biofilms play a key role in determining the recruitment success of invertebrates. The precise interactions among environmental conditions, biofilm dynamics and larval settlement, however, have been poorly investigated (Lau et al. 2005).Among all the potential environmental factors, ultraviolet radiation (UVR, 280 to 400 nm) is considered one of the most important variables in marine ecosystems. Although the ozone layer in the atmosphere filters out most of the biologically destructive UVR, depletion of ozone due to anthropogenic pollution results in an increase in short-wavelength UVR that reaches the earth's surface (Smith et al. 1992). This enhanced UVR causes significant unfavorable effects in marine ecosystems, as both UV-B (280 to 315 nm) and UV-A (315 to 400 nm) can penetrate to significant depths (Kirt 1994, Conde et al. 2000. For example, previous studies documented the negative effects of UVR on phytoplankton (e.g. Santas et al. 1998, Helbling et al. 2001 and references therein), bacterioplankton (e.g. Helbling et al. 1995, Jeffrey et al. 1996, Kaiser & Herndl 1997, Gustavson e...

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Induction of larval settlement in the polychaete Hydroides elegans by extracellular polymers of benthic diatoms

Cited by 54 publications

References 39 publications

Compatible solutes in three marine intertidal microphytobenthic Wadden Sea diatoms exposed to different salinities

Compatible solutes in three marine intertidal microphytobenthic Wadden Sea diatoms exposed to different salinities

Indole derivatives inhibited the formation of bacterial biofilm and modulated Ca2+ efflux in diatom

Effect of ultraviolet radiation on biofilms and subsequent larval settlement of Hydroides elegans

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