Patchiness and life cycle of intertidal foraminifera: Implication for environmental and paleoenvironmental interpretation

Morvan, Julie; Debenay, Jean-Pierre; Jorissen, Frans; Redois, Fabrice; Bénéteau, Eric; Delplancke, Malou; Amato, Anne-Sophie

doi:10.1016/j.marmicro.2006.05.009

Cited by 83 publications

(47 citation statements)

References 25 publications

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“…Furthermore, in these transitional coastal environments (e.g. estuaries, bays, lagoons) A. tepida and H. germanica are usually the dominant meiofauna species in West Atlantic French coast mudflats (Debenay et al, 2000Morvan et al, 2006;Bouchet et al, 2009;Pascal et al, 2009;Thibault de Chanvalon et al, 2015). Their vertical distribution in the sediment is characterised by a clear maximum density at the surface (Alve and Murray, 2001;Bouchet et al, 2009;Thibault de Chanvalon et al, 2015) with access to light, followed by a sharp decrease in the next two centimetres (Thibault de Chanvalon et al, 2015).…”

Section: T Jauffrais Et Al: Effect Of Light On Photosynthetic Efficmentioning

confidence: 99%

“…Thus, using 1000 pmol O 2 cell −1 d −1 at 300 µmol photons m −2 s −1 , ∼ 200 to 4000 cells per 50 cm 3 in the top 0.5 cm (Morvan et al, 2006;Bouchet et al, 2007) and assuming that photosynthesis produced one mol O 2 per mol of C fixed, H. germanica primary production would be between 1.8 × 10 −5 and 4.0 × 10 −4 mol C m −2 d −1 . This is a very low value compared to microphytobenthos primary production in Atlantic mudflat ecosystems, which usually range from 1.5 to 5.9 mol C m −2 d −1 (e.g.…”

Section: Chloroplast Functionalitymentioning

confidence: 99%

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Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (Haynesina germanica and Ammonia tepida)

et al. 2016

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Abstract. Some benthic foraminifera have the ability to incorporate functional chloroplasts from diatoms (kleptoplasty). Our objective was to investigate chloroplast functionality of two benthic foraminifera (Haynesina germanica and Ammonia tepida) exposed to different irradiance levels (0, 25, 70 µmol photon m −2 s −1 ) using spectral reflectance, epifluorescence observations, oxygen evolution and pulse amplitude modulated (PAM) fluorometry (maximum photosystem II quantum efficiency (Fv/Fm) and rapid light curves (RLC)). Our results clearly showed that H. germanica was capable of using its kleptoplasts for more than 1 week while A. tepida showed very limited kleptoplastic ability with maximum photosystem II quantum efficiency (Fv/Fm = 0.4), much lower than H. germanica and decreasing to zero in only 1 day. Only H. germanica showed net oxygen production with a compensation point at 24 µmol photon m −2 s −1 and a production up to 1000 pmol O 2 cell −1 day −1 at 300 µmol photon m −2 s −1 . Haynesina germanica Fv/Fm slowly decreased from 0.65 to 0.55 in 7 days when kept in darkness; however, it quickly decreased to 0.2 under high light. Kleptoplast functional time was thus estimated between 11 and 21 days in darkness and between 7 and 8 days at high light. These results emphasize that studies about foraminifera kleptoplasty must take into account light history. Additionally, this study showed that the kleptoplasts are unlikely to be completely functional, thus requiring continuous chloroplast resupply from foraminifera food source. The advantages of keeping functional chloroplasts are discussed but more information is needed to better understand foraminifera feeding strategies.

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Section: T Jauffrais Et Al: Effect Of Light On Photosynthetic Efficmentioning

confidence: 99%

Section: Chloroplast Functionalitymentioning

confidence: 99%

Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (Haynesina germanica and Ammonia tepida)

et al. 2016

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“…In photic shallow-water habitats (e.g., estuaries, bays, lagoons and other intertidal or shallow-water subtidal areas), kleptoplastic benthic foraminiferal species, such as Haynesina germanica, Elphidium williamsoni, the "excavatum" species complex (e.g., E. oceanense, E. selseyense, see Darling et al (2016)), or Ammonia spp., are often the dominant mudflat foraminiferal taxa (Debenay et al, 2000;Debenay et al, 2006;Morvan et al, 2006;Bouchet et al, 2009;Pascal et al, 2009;Thibault de Chanvalon et al, 2015;Cesbron et al, 2016). Their vertical distribution is characterized by a clear maximum density in the upper oxygenated millimeters of the sediment (Alve and Murray, 2001;Bouchet et al, 2009;Thibault de Chanvalon et al, 2015;Cesbron et al, 2016), where light can also penetrate (Kuhl et al, 1994;Cartaxana et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Ultrastructure and distribution of kleptoplasts in benthic foraminifera from shallow-water (photic) habitats

Jauffrais

Lekieffre

Koho

et al. 2018

Marine Micropaleontology

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Assimilation, sequestration and maintenance of foreign chloroplasts inside an organism is termed "chloroplast sequestration" or "kleptoplasty". This phenomenon is known in certain benthic foraminifera, in which such kleptoplasts can be found both intact and functional, but with different retention times depending on foraminiferal species. In the present study, seven species of benthic foraminifera (Haynesina germanica, Elphidium williamsoni, E. selseyense, E. oceanense, E. aff. E. crispum, Planoglabratella opercularis and Ammonia sp.) were collected from shallow-water benthic habitats and examined with transmission electron microscope (TEM) for cellular ultrastructure to ascertain attributes of kleptoplasts. Results indicate that all these foraminiferal taxa actively obtain kleptoplasts but organized them differently within their endoplasm. In some species, the kleptoplasts were evenly distributed throughout the endoplasm (e.g., H. germanica, E. oceanense, Ammonia sp.), whereas other species consistently had plastids distributed close to the external cell membrane (e.g., Elphidium williamsoni, E. selseyense, P. opercularis).Chloroplast degradation also seemed to differ between species, as many degraded plastids were found in Ammonia sp. and E. oceanense compared to other investigated species. Digestion ability, along with different feeding and sequestration strategies may explain the differences in retention time between taxa. Additionally, the organization of the sequestered plastids within the endoplasm may also suggest behavioral strategies to expose and/or protect the sequestered plastids to/from light and/or to favor gas and/or nutrient exchange with their surrounding habitats.

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“…On the Atlantic coast of France, Morvan et al (2006) examined intertidal foraminifera from 10 stations along three traverses parallel to the shoreline. The traverses were at high marsh, intertidal, and at neap low tide, with each of the stations 10 m apart.…”

Section: Source Sum Of Squares Df Mean Squares F-ratio P-valuementioning

confidence: 99%

“…Because of the large variation in the counts of individuals from closely spaced samples, researchers believe the counts may not be "true replicates" or may bias their observations of larger-scale patterns. Consequently, for example, Morvan et al (2006) and Goldstein and Alve (2011), because they were interested in larger patterns, mixed or added together replicate samples. Although this procedure may seem logical or even desirable, it prevents any estimate of confi dence limits on the observations and makes analysis by an ANOVA with a complete higher-way layout (two-or three-way ANOVA with interaction), as done here, impossible.…”

Section: Pseudoreplicationmentioning

confidence: 99%

Pulsating Patches History and Analyses of Spatial, Seasonal, and Yearly Distribution of Living Benthic Foraminifera

Buzas¹,

Hayek²,

Jett³

et al. 2015

Smithsonian Contributions to Paleobiology

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Patchiness and life cycle of intertidal foraminifera: Implication for environmental and paleoenvironmental interpretation

Cited by 83 publications

References 25 publications

Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (<i>Haynesina germanica</i> and <i>Ammonia tepida</i>)

Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (<i>Haynesina germanica</i> and <i>Ammonia tepida</i>)

Ultrastructure and distribution of kleptoplasts in benthic foraminifera from shallow-water (photic) habitats

Pulsating Patches History and Analyses of Spatial, Seasonal, and Yearly Distribution of Living Benthic Foraminifera

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Patchiness and life cycle of intertidal foraminifera: Implication for environmental and paleoenvironmental interpretation

Cited by 83 publications

References 25 publications

Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (&lt;i&gt;Haynesina germanica&lt;/i&gt; and &lt;i&gt;Ammonia tepida&lt;/i&gt;)

Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (&lt;i&gt;Haynesina germanica&lt;/i&gt; and &lt;i&gt;Ammonia tepida&lt;/i&gt;)

Ultrastructure and distribution of kleptoplasts in benthic foraminifera from shallow-water (photic) habitats

Pulsating Patches History and Analyses of Spatial, Seasonal, and Yearly Distribution of Living Benthic Foraminifera

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Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (<i>Haynesina germanica</i> and <i>Ammonia tepida</i>)

Effect of light on photosynthetic efficiency of sequestered chloroplasts in intertidal benthic foraminifera (<i>Haynesina germanica</i> and <i>Ammonia tepida</i>)