Chlorophyll fluorescence measures of seagrasses Halophila ovalis and Zostera capricorni reveal differences in response to experimental shading

Bité, Juanita S.; Campbell, Stuart J.; McKenzie, Len J.; Coles, Robert G.

doi:10.1007/s00227-007-0700-6

Cited by 30 publications

(25 citation statements)

References 26 publications

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“…In both experiments conducted, low irradiance (37 μmol photons m −2 s −1 ) resulted in higher ΔF/Fm′ than higher values (65 μmol photons m −2 s −1 ), while the source meadow of the material had no significant influence on their response (Table 7). These findings are consistent with studies of other seagrass species where high light (100-1000 μmol photons m −2 s −1 ) caused significant declines in photosynthetic activity, including ΔF/Fm′, as well as shoot size and chlorophyll content (Abal et al, 1994;Beer and Waisel, 1982;Bite et al, 2007;Dennison, 1987;Kraemer and Hanisak, 2000;Lee and Dunton, 1997;Masini et al, 1995;Ralph, 1999;Ralph and Burchett, 1995).…”

Section: Effect Of Po 4 3− Exposure Under Different Light Conditionssupporting

confidence: 91%

Intra-specific responses of Cymodocea nodosa to macro-nutrient, irradiance and copper exposure

Papathanasiou¹,

Orfanidis²,

Brown

2015

Journal of Experimental Marine Biology and Ecology

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Excess macro-nutrients, metal contamination and light limitation are three of the most commonly encountered anthropogenic stressors affecting seagrass meadows. In this study, the effects of different combinations of nutrients (N-NO 3 , P-PO 4 ), copper and irradiance were investigated in shoots of Cymodocea nodosa collected from three meadows in the N. Aegean Sea, one (Nea Karvali) impacted by anthropogenically-derived environmental stressors and two in more pristine condition (Thasos, Brasidas). In a series of laboratory experiments, shoots were exposed to varying nutrient and heavy metal concentrations, as well as varying irradiance levels, for 8 days and the effective quantum yield (ΔF/Fm′) and leaf elongation were quantified. Results showed that C. nodosa increased ΔF/Fm′ under high nutrient concentrations (30 μΜ N-NO 3− -2 μΜ P-PO 4 3− ) but significant differences were only apparent in shoots collected from the oligotrophic-less stressed meadows. Irradiance affected ΔF/Fm′ significantly in all shoots irrespective of source and PO 4 -P concentration, while higher values were measured under low light conditions and it was identified as the main pathway of eutrophication stress in N. Aegean Cymodocea meadows. Shoots, independently of acclimation were tolerant to copper enrichment, with only the highest copper concentrations (4.7 and 7.9 μM) having significant negative effects on ΔF/Fm′. Shoots from the more pristine meadows were less affected by Cu than those from the highly stressed meadow.

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Section: Effect Of Po 4 3− Exposure Under Different Light Conditionssupporting

confidence: 91%

Intra-specific responses of Cymodocea nodosa to macro-nutrient, irradiance and copper exposure

Papathanasiou¹,

Orfanidis²,

Brown

2015

Journal of Experimental Marine Biology and Ecology

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“…This is shown in morphological responses exhibited during shading experiments such as decreases in leaf length, leaf width, shoot growth, and fewer leaves per shoot reducing overall plant surface area (Olesen and Sand-jensen, 1993;Biber et al, 2009;Ochieng et al, 2010;Collier et al, 2012b;Yaakub et al, 2013). The photosynthetic performance of seagrasses, measured using chlorophyll fluorescence, has been found to be affected by light stress within a relatively short time-frame from within days to just seconds (Ralph and Gademann, 2005;Bité et al, 2007). The reduction in light availability results in an increase in the light capture efficiency of the photosystems, but an overall decrease in electron transport rates and carbon fixation (Ralph and Gademann, 2005;Bité et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The photosynthetic performance of seagrasses, measured using chlorophyll fluorescence, has been found to be affected by light stress within a relatively short time-frame from within days to just seconds (Ralph and Gademann, 2005;Bité et al, 2007). The reduction in light availability results in an increase in the light capture efficiency of the photosystems, but an overall decrease in electron transport rates and carbon fixation (Ralph and Gademann, 2005;Bité et al, 2007). Light reduction can also result in an increase in chlorophyll content, with the chlorophyll a:b ratio lowering to increase photosynthetic efficiency (Collier et al, 2008(Collier et al, , 2012bSharon et al, 2009;Silva et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Light Stress Responses by the Eelgrass, Zostera marina (L)

Bertelli

Unsworth

2018

Front. Environ. Sci.

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Zostera marina is the dominant seagrass species in the Northern Hemisphere where it grows in sheltered bays and estuaries. As a consequence of its distribution its conservation is commonly threatened by poor coastal water quality. The high minimum light requirements of seagrasses results in water quality degradation (high turbidity and eutrophication) being a significant risk. Bioindicators of light stress can be used to interpret seagrass responses to light limitation and therefore act as sentinels for conservation management. However, there exists limited experimental inter-comparison of the effectiveness of multiple individual bioindicator responses. Meta-analysis suggests that rhizome sugars, shoot C:N, shoot growth, and number of leaves per shoot provide the most consistent response variables to increasing light limitation in seagrass, but this premise remains largely untested at the plant level as a direct comparison of multiple bioindicators. The present study aimed to test the morphological, physiological, and photo-physiological bioindicator responses of Z. marina to light stress applied within controlled laboratory conditions. These bioindicators were used to assign minimum light thresholds. Growth rate and photophysiological parameters (alpha, E k , and ETR max) were rapidly (1st week) and drastically affected by low light shade treatments (20.12 µmol photons m −2 s −1 and lower). After 3 weeks at low light, significant reductions in maximum leaf length and leaf width were observed. Principal Component Analysis identified leaf length, shoot growth, shoot surface area, ETR max , E k , and alpha as having the strongest responses to reduced light. Shoot growth, ETR max , E k , and alpha were found to provide the best early warning of light limitation after 5-8 days. These results provide evidence for bioindicators of light stress in Z. marina and highlights the importance of understanding these responses for the successful management and conservation of this species.

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“…Chl fluorescence Fo' is the minimal fluorescence yield of illuminated sample with all photosystem PS II centers open (Guidi and Calatayud 2014). Chl fluorescence Fo' is inversely correlated to photosynthetic efficiency (Bité et al 2007), thus providing information about plant health (e.g. Percival 2005, Nikolić et al 2008); 2.…”

Section: Photosynthetic Characteristics Of Spathodea Along the Elevatmentioning

confidence: 99%

“…Percival 2005, Nikolić et al 2008); 2. Maximum electron transport rate (ETR max ) reflects maximum flow of electrons, a measure of how quickly electrons can move through the photosystem (Bité et al 2007). It is related to maximum photosynthetic rate (Edwards andBaker 1993, Eichelman et al 2004); 3.…”

Section: Photosynthetic Characteristics Of Spathodea Along the Elevatmentioning

confidence: 99%

Elevational distribution and photosynthetic characteristics of the invasive tree Spathodea campanulata on the island of Tahiti (South Pacific Ocean)

Larrue¹,

Daehler²,

Meyer³

et al. 2016

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Successful invasion is often due to a combination of species characteristics (or invasiveness) and habitat suitability (or invasibility). Our objective was to identify preferred habitats and suitable environmental conditions for the African tulip tree Spathodea campanulata (Bignoniaceae), one of the most invasive alien trees on the tropical island of French Polynesia (South Pacific Ocean), in relation to its distribution and photosynthesis capacity. Spathodea abundance and leaf chlorophyll fluorescence Fo', ETR max , and Y(II) effective were examined in relation to topography and micro-climate along elevational transects between 140 m and 1,300 m. Results showed that Spathodea is (1) present up to 1,240 m with lowest maximum July-October (cool season) temperature of 9.4 °C and an average July-October temperature of 14.6 °C, (2) is able to colonize slope steepness of more than 45°, (3) RESEARCH ARTICLE Advancing research on alien species and biological invasions A peer-reviewed open-access journal NeoBiotaSébastien Larrue et al. / NeoBiota 30: 127-149 (2016) 128 cantly supporting the hypothesis that this range is a non-preferred environment, probably due to microclimate conditions characterized by punctual air dryness. Among Spathodea plants surveyed along a wetter transect, Y(II)effective and ETR max were comparable from low elevation to mid-high elevation indicating that the potential photosynthesis rate of Spathodea may be similar from sea level until mid-high elevation. Major infestations on the island of Tahiti were reported on the leeward (drier and urbanized) west coast, but Spathodea has also been recently found on the slopes of the windward (wetter) east coast. Chlorophyll fluorescence measurements indicate a high photosynthetic capacity among Spathodea in wet environments suggesting that Spathodea will become invasive across most of the island of Tahiti.

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Chlorophyll fluorescence measures of seagrasses Halophila ovalis and Zostera capricorni reveal differences in response to experimental shading

Cited by 30 publications

References 26 publications

Intra-specific responses of Cymodocea nodosa to macro-nutrient, irradiance and copper exposure

Intra-specific responses of Cymodocea nodosa to macro-nutrient, irradiance and copper exposure

Light Stress Responses by the Eelgrass, Zostera marina (L)

Elevational distribution and photosynthetic characteristics of the invasive tree Spathodea campanulata on the island of Tahiti (South Pacific Ocean)

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