Physiological response to irradiance, temperature and co-cultivation in Antarctic engineering brown algae (Desmarestia menziesii and D. anceps)

Savaglia, Valentina; Matula, Carolina Verónica; Quartino, María Liliana; Francione, Mariano Valli; Zacher, Katharina

doi:10.1007/s00300-019-02578-1

Cited by 2 publications

(5 citation statements)

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“…As growth was optimal at 0-5 °C, D. menziesii otherwise is in line with other endemic Antarctic Desmarestiales (Wiencke and tom Dieck 1989Dieck , 1990Zacher et al 2016;Savaglia et al 2019) showing a specific cold-water adapted growth response. At higher temperatures growth and maximum photosynthetic quantum yield F v /F m of sporophytes constantly decreased over a period of 14 days, reaching lowest values at 15 and 16 °C.…”

Section: Discussionsupporting

confidence: 78%

“…photosynthesis in macroalgae (Navarro et al 2020) and F v /F m has been successfully used to quantify detrimental responses to temperature as an early warning indicator rather than thallus bleaching, especially at upper sub-lethal temperatures (Olabarria et al 2013;Graiff et al 2015;Savaglia et al 2019). Prior to the beginning of the acclimation phase (day -6), pre-experimental individuals were measured to document the initial status of the material after cultivation (n = 4).…”

Section: Maximum Quantum Yield (F V /F M ) Of the Sporophytesmentioning

confidence: 99%

“…1). The PAM fiber optic was placed at 1-2 cm from the apical tip of the thallus between the main axis and the first branch and F v /F m was determined after 3 min of dark adaption following Zacher et al ( 2016): darkening for 3, 5, 7, 10, and 15 min did not result in any significant differences in F v /F m and values as high as in other studies were reached (Rautenberger et al 2015;Schoenrock et al 2015;Savaglia et al 2019). Maximum quantum yield of PSII (F v / F m ) was calculated by the PAM software, according to the following equation:…”

Section: Maximum Quantum Yield (F V /F M ) Of the Sporophytesmentioning

confidence: 99%

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Effects of seawater temperature and seasonal irradiance on growth, reproduction, and survival of the endemic Antarctic brown alga Desmarestia menziesii (Phaeophyceae)

et al. 2022

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Endemic Antarctic macroalgae are especially adapted to live in extreme Antarctic conditions. Their potential biogeographic distribution niche is primarily controlled by the photoperiodic regime and seawater temperatures, since these parameters regulate growth, reproduction, and survival during the entire life cycle. Here we analyzed the upper survival temperature (UST) of juvenile sporophytes and the temperature range for sporophyte formation from gametophytes of Desmarestia menziesii, one of the dominant endemic Antarctic brown algal species. This process is a missing link to better evaluate the full biogeographical niche of this species. Two laboratory experiments were conducted. First, growth and maximum quantum yield of juvenile sporophytes were analyzed under a temperature gradient (0, 5, 10, 12, 13, 14, 15, and 16 °C) in a 16:8 h light:dark (LD) regime (Antarctic spring condition) for 2 weeks. Second, the formation of sporophytes from gametophytes (as a proxy of gametophyte reproduction) was evaluated during a 7 weeks period under a temperature gradient (0, 4, 8, 12, and 16 °C), and two different photoperiods: 6:18 h LD regime simulating winter conditions and a light regime simulating the Antarctic shift from winter to spring by gradually increasing the light period from 7.5:16.5 h LD (late winter) to 18.5:5.5 h LD (late spring). Sporophytes of D. menziesii were able to grow and survive up to 14 °C for 2 weeks without visible signs of morphological damage. Thus, this species shows the highest UST of all endemic Antarctic Desmarestiales species. In turn, gametophyte reproduction solely took place at 0 °C but not at 4–8 °C. The number of emerging sporophytes was six times higher under the light regime simulating the transition from winter to spring than under constant short day winter conditions. There was a negative relationship between the number of sporophytes formed and the gametophyte density at the beginning of the experiment, which provides evidence that gametophyte density exerts some control upon reproduction in D. menziesii. Results strongly indicate that although sporophytes and gametophytes may survive in warmer temperatures, the northernmost distribution limit of D. menziesii in South Georgia Islands is set by the low temperature requirements for gametophyte reproduction. Hence, global warming could have an impact on the distribution of this and other Antarctic species, by influencing their growth and reproduction.

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Section: Discussionsupporting

confidence: 78%

Section: Maximum Quantum Yield (F V /F M ) Of the Sporophytesmentioning

confidence: 99%

Section: Maximum Quantum Yield (F V /F M ) Of the Sporophytesmentioning

confidence: 99%

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Effects of seawater temperature and seasonal irradiance on growth, reproduction, and survival of the endemic Antarctic brown alga Desmarestia menziesii (Phaeophyceae)

et al. 2022

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“…requirement for growth in L. glaciale rhodoliths lowers, and/or rhodoliths utilize stored photosynthates, at near-zero temperatures. Savaglia et al (2019) found that photosynthetic efficiency of the Antarctic phaeophytes Desmarestia menziesii and D. anceps was higher at 2°C with low irradiance (10 μmol pho-tonsÁm −2 Ás −1 ) than 7°C with high irradiance (100 μmol photonsÁm −2 Ás −1 ) conditions. Schwarz et al (2005) found a light compensation point of ~0.1 µmol photonsÁm -2 Ás -1 in Antarctic coralline algae crusts exposed to low-light conditions under sea ice over ~17 months.…”

Section: Discussionmentioning

confidence: 91%

“…Savaglia et al. (2019) found that photosynthetic efficiency of the Antarctic phaeophytes Desmarestia menziesii and D. anceps was higher at 2°C with low irradiance (10 μmol photons·m −2 ·s −1 ) than 7°C with high irradiance (100 μmol photons·m −2 ·s −1 ) conditions. Schwarz et al.…”

Section: Discussionmentioning

confidence: 99%

Growth Resilience of Subarctic Rhodoliths (Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance

Arnold

Bélanger

Gagnon

2022

Journal of Phycology

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Rhodolith beds are pervasive marine biological systems in the subarctic North Atlantic. Limited knowledge about effects of temperature and irradiance on rhodolith growth limits the ability to anticipate the response of rhodolith beds to this ocean's chronic low, yet changing sea temperature and irradiance regimes. We carried out a 149‐d laboratory experiment with Newfoundland Lithothamnion glaciale rhodoliths to test the predictions that growth (i) is inhibited at temperatures of ~0.5°C and (ii) resumes as temperature increases above 0.5°C, albeit at a higher rate under high than low irradiances. Rhodoliths were grown in experimental tanks at near‐zero (~0.7°C) seawater temperatures during the first 85 d and at temperatures increasing naturally to ~6°C for the remaining 64 d. Rhodoliths in those tanks were exposed to either low (0.02 mol photons·m−2·d−1) or high (0.78 mol photons·m−2·d−1) irradiances during the entire experiment. Rhodoliths grew at a linear rate of ~281 μm·year−1 (0.77 μm·d−1) throughout the experiment under both irradiance treatments despite daily seawater temperature variation of up to 3°C. Near‐zero temperatures of ~0.5 to 1.0°C did not inhibit rhodolith growth. Model selection showed that PAR‐day (a cumulative irradiance index) was a better predictor of growth variation than Degree‐day (a cumulative thermal index). Our findings extend to ~0.5°C the lower limit of the known temperature range (~1 to at least 16°C) over which growth in L. glaciale rhodoliths remains unaffected, while suggesting that the growth–irradiance relationship in low‐light environments at temperatures below 6°C is less irradiance‐driven than recently proposed.

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Physiological response to irradiance, temperature and co-cultivation in Antarctic engineering brown algae (Desmarestia menziesii and D. anceps)

Cited by 2 publications

References 69 publications

Effects of seawater temperature and seasonal irradiance on growth, reproduction, and survival of the endemic Antarctic brown alga Desmarestia menziesii (Phaeophyceae)

Effects of seawater temperature and seasonal irradiance on growth, reproduction, and survival of the endemic Antarctic brown alga Desmarestia menziesii (Phaeophyceae)

Growth Resilience of Subarctic Rhodoliths (Lithothamnion glaciale, Rhodophyta) to Chronic Low Sea Temperature and irradiance

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