Coccolithophore haploid and diploid distribution patterns in the Mediterranean Sea: can a haplo-diploid life cycle be advantageous under climate change?

D'Amario, Barbara; Ziveri, Patrizia; Grelaud, Michaël; Oviedo, Angela Maria; Kralj, Martina

doi:10.1093/plankt/fbx044

Cited by 35 publications

(41 citation statements)

References 97 publications

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Section: Discussionmentioning

confidence: 99%

“…Holococcoliths have a distinct preference for warm and oligotrophic water (Oviedo et al, ) and may be able to adapt to ongoing Mediterranean climate change, where surface water would be characterized by relatively high calcite saturation state, high temperature, stratification, and nutrient limitation (D'Amario et al, ). In accordance with their ecological preference, holococcoliths are especially abundant in eastern Mediterranean water samples (D'Amario et al, ; Oviedo et al, ). Even though the Mediterranean waters are supersaturated with respect to calcite (Schneider et al, ), holococcolith diversity and abundance are reduced in surface sediments (Kleijne, ; Knappertsbusch, ), because of disaggregation into microcrystals and lysocline/seafloor dissolution.…”

Section: Discussionmentioning

confidence: 99%

“…Holococcoliths are produced by coccolithophores during their haploid life phase. Although belonging to different species, they behave as a homogeneous group (Oviedo et al, ), preferring warm and oligotrophic surface waters (D'Amario et al, ; Kleijne, ; Knappertsbusch, ; Oviedo et al, ).…”

Section: Methodsmentioning

confidence: 99%

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Reventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation

Incarbona

Abu-Zied

Rohling

et al. 2019

Paleoceanog and Paleoclimatol

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Organic‐rich layers (sapropels), preserved in eastern Mediterranean marine sediment records, represent pronounced perturbations to thermohaline circulation and environmental conditions in the basin, in response to enhanced African monsoon activity and subsequent massive freshwater discharge. During the most recent event, Sapropel S1 formed between 10.8 and 6.1 ka, when freshwater‐driven stratification caused seafloor anoxia below ~1,800‐m depth, as a result of both failure of deep water formation and enhanced productivity. Here we analyze coccolith assemblages from the open eastern Mediterranean that form a west‐east transect across the basin and provide insights on past environmental changes. We focus on holococcoliths, which are specifically produced by coccolithophores as part of their life cycle during the haploid phase. Since holococcolith calcification is characterized by nanocrystals highly susceptible to dissolution, we are testing their potential preservation under different bottom environmental conditions, including the effect of postdepositional oxidation. A comparison with benthic foraminifera assemblages in a core recovered close to Lybia reveals that holococcolith preservation is enhanced during seafloor reventilation and benthic foraminiferal repopulation in the middle to upper part of the record, before the actual sapropel termination. There are two such events of improved deep‐water oxygenation in the Aegean and Adriatic Seas at 8.2 and 7.4 ka. The latter episode marks the onset of the transition to restored circulation in the eastern Mediterranean Sea, due to resumption of deep‐water formation in the southern Aegean Sea and the conclusion of enhanced biogenic productivity.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Reventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation

Incarbona

Abu-Zied

Rohling

et al. 2019

Paleoceanog and Paleoclimatol

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“…During this study we recorded both life‐cycle phases for seven species, while Koebrich et al () found six species in both their holo‐ and heterococcolith‐bearing phases using sediment traps offshore NW Africa. D'Amario et al () reported seven species from two cruises in April 2011 and May 2013 in the southern basins of the Mediterranean Sea, and Šupraha et al () found 14 species in the Krka estuary. Okada and Mcintyre () sampled five stations in Western North Atlantic, and first noted the seasonal separation for life‐cycle phases of the species Coccolithus pelagicus .…”

Section: Discussionmentioning

confidence: 99%

“…E. huxleyi was negatively related to temperature and positively with salinity nitrate and Taxonomic remarks: * HOL phase described in Cros et al (2000), similar to Sphaerocalyptra, not separately described before. † Dimiza et al (2008): 10 unambiguous combination coccospheres of A. robusta and Sphaerocalyptra quadridentata described from natural populations (Kamptner (1941) Young et al (2003). Table 2).…”

Section: Coccolithophore Floristic Composition and Diversity Indicesmentioning

confidence: 99%

Coastal zones as important habitats of coccolithophores: A study of species diversity, succession, and life‐cycle phases

Godrijan

Young

Pfannkuchen

et al. 2018

Limnology & Oceanography

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Coccolithophores are unicellular calcifying eukaryotes with a complex life‐cycle; they are important primary producers, and major drivers of global biogeochemical cycles. The majority of research on coccolithophores has been focused on open ocean waters, while the knowledge of their roles in coastal ecosystems is limited. Early 20th century studies of the Adriatic coast produced major taxonomic papers describing half of the projected diversity of coccolithophores. Afterwards, there have been only scarce records of their diversity and ecology in the Adriatic, and coastal systems in general. We aimed to assess coccolithophore diversity and species succession, and closely examine their ecological preferences in the coastal area of the northern Adriatic. We recorded coccolithophores throughout the year at 100% frequency, documented 52 taxa, abundances as high as 2.4 × 105 cells L−1, and noted the winter domination over the phytoplankton community. Out of 52 observed coccolithophore taxa, 31 were heterococcolithophorids and 21 holococcolithophorids. Moreover, seven pairs of heterococcolith and holococcolith phases were noted, and two strategies of temporal separation of life‐cycle phases were observed. We report ecological preferences of those life‐cycle pairs and give in situ evidence that holo‐ and heterococcolith phases are widening the specie's ecological niches. This expansion allows the species to exploit a wider range of ecological conditions and enables phenotypic plasticity, important in response to changes in the environment. With this study we emphasize that coastal areas are highly productive for coccolithophore studies. Our results indicate that a shift in research effort on coccolithophores in the coastal waters is needed.

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Nutritional response of a coccolithophore to changing pH and temperature

Johnson

Langer

Rossi

et al. 2022

Limnology & Oceanography

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Coccolithophores are a calcifying unicellular phytoplankton group that are at the base of the marine food web, and their lipid content provides a source of energy to consumers. Coccolithophores are vulnerable to ocean acidification and warming, therefore it is critical to establish the effects of climate change on these significant marine primary producers, and determine potential consequences that these changes can have on their consumers. Here, we quantified the impact of changes in pH and temperature on the nutritional condition (lipid content, particulate organic carbon/nitrogen), growth rate, and morphology of the most abundant living coccolithophore species, Emiliania huxleyi. We used a regression type approach with nine pH levels (ranging from 7.66 to 8.44) and two temperatures (15°C and 20°C). Lipid production was greater under reduced pH, and growth rates were distinctly lower at 15°C than at 20°C. The production potential of lipids, which estimates the availability of lipids to consumers, increased under 20°C, but decreased under low pH. The results indicate that, while consumers will benefit energetically under ocean warming, this benefit will be mitigated by ocean acidification. The carbon to nitrogen ratio was higher at 20°C and low pH, indicating that the nutritional quality of coccolithophores for consumers will decline under climate change. The impact of low pH on the structural integrity of the coccosphere may also mean that coccolithophores are easier to digest for consumers. Many responses suggest cellular stress, indicating that increases in temperature and reductions in pH may have a negative impact on the ecophysiology of coccolithophores.

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Coccolithophore haploid and diploid distribution patterns in the Mediterranean Sea: can a haplo-diploid life cycle be advantageous under climate change?

Cited by 35 publications

References 97 publications

Reventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation

Reventilation Episodes During the Sapropel S1 Deposition in the Eastern Mediterranean Based on Holococcolith Preservation

Coastal zones as important habitats of coccolithophores: A study of species diversity, succession, and life‐cycle phases

Nutritional response of a coccolithophore to changing pH and temperature

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