Photosynthesis and related physiological processes in two mangrove species, <i>Rhizophora mucronata</i> and <i>Ceriops tagal,</i> at Gazi Bay, Kenya

Theuri, M. Mwangi; Kinyamario, JI; Speybroeck, D. Van

doi:10.1046/j.1365-2028.1999.00167.x

Cited by 14 publications

(5 citation statements)

References 8 publications

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“…However, the positive effects of diffuse solar irradiance were notable only at lower T A (≤21°C). At higher T A , high K t was usually associated with PAR values above the saturation value of 1000 mmol (photons) m −2 s −1 reported for R. mangle [Barr et al, 2009], Rhizophora mucronata and Ceriops tagal [Theuri et al, 1999], and Avicennia marina [Naidoo et al, 1997]. Therefore, a substantial proportion of the mangrove foliage during the summer months can function at or near light saturation conditions, and this process can reduce any positive effects of decreasing K t on NEE.…”

Section: Discussionmentioning

confidence: 88%

“…Contours of equal NEE values were then constructed across the two dimensions of the PAR-T A matrix (Sigma Plot Version 11, Systat Software, Inc., San Jose, California). We also investigated salinity effects on GEP [Lopez-Hoffman et al, 2006;Theuri et al, 1999;Ball and Pidsley, 1995;Suárez and Medina, 2006]. Daily total GEP was normalized by daily total PAR (here termed the light use efficiency (LUE)).…”

Section: Salinity Effectsmentioning

confidence: 99%

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Controls on mangrove forest‐atmosphere carbon dioxide exchanges in western Everglades National Park

Barr¹,

Engel²,

et al. 2010

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[1] We report on net ecosystem production (NEP) and key environmental controls on net ecosystem exchange (NEE) of carbon dioxide (CO 2 ) between a mangrove forest and the atmosphere in the coastal Florida Everglades. An eddy covariance system deployed above the canopy was used to determine NEE ), reaching peak values during the summer wet season. During the winter dry season, forest CO 2 assimilation increased with the proportion of diffuse solar irradiance in response to greater radiative transfer in the forest canopy. Surface water salinity and tidal activity were also important controls on NEE. Daily light use efficiency was reduced at high (>34 parts per thousand (ppt)) compared to low (<17 ppt) salinity by 46%. Tidal inundation lowered daytime R d by ∼0.9 mmol (CO 2 ) m −2 s −1 and nighttime R d by ∼0.5 mmol (CO 2 ) m −2 s −1. The forest was a sink for atmospheric CO 2 , with an annual NEP of 1170 ± 127 g C m −2 during 2004. This unusually high NEP was attributed to year-round productivity and low ecosystem respiration which reached a maximum of only 3 g C m. Tidal export of dissolved inorganic carbon derived from belowground respiration likely lowered the estimates of mangrove forest respiration. These results suggest that carbon balance in mangrove coastal systems will change in response to variable salinity and inundation patterns, possibly resulting from secular sea level rise and climate change.

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Section: Discussionmentioning

confidence: 88%

Section: Salinity Effectsmentioning

confidence: 99%

Controls on mangrove forest‐atmosphere carbon dioxide exchanges in western Everglades National Park

Barr¹,

Engel²,

et al. 2010

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“…The rate of photosynthesis and stomatal conductance also increased in Kenyan R . mucronata during the wet season [ 80 ], indicating higher growth rate with higher precipitation. For other terrestrial species, like Teak ( Tectona grandis L.), tree growth in a similar monsoonal climate in Myanmar is positively correlated with precipitation during and prior to the monsoon (May–September) [ 23 , 28 ].…”

Section: Discussionmentioning

confidence: 99%

Climatic Signals in Tree Rings of Heritiera fomes Buch.-Ham. in the Sundarbans, Bangladesh

2016

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Mangroves occur along the coastlines throughout the tropics and sub-tropics, supporting a wide variety of resources and services. In order to understand the responses of future climate change on this ecosystem, we need to know how mangrove species have responded to climate changes in the recent past. This study aims at exploring the climatic influences on the radial growth of Heritiera fomes from a local to global scale. A total of 40 stem discs were collected at breast height position from two different zones with contrasting salinity in the Sundarbans, Bangladesh. All specimens showed distinct tree rings and most of the trees (70%) could be visually and statistically crossdated. Successful crossdating enabled the development of two zone-specific chronologies. The mean radial increment was significantly higher at low salinity (eastern) zone compared to higher salinity (western) zone. The two zone-specific chronologies synchronized significantly, allowing for the construction of a regional chronology. The annual and monsoon precipitation mainly influence the tree growth of H. fomes. The growth response to local precipitation is similar in both zones except June and November in the western zone, while the significant influence is lacking. The large-scale climatic drivers such as sea surface temperature (SST) of equatorial Pacific and Indian Ocean as well as the El Niño-Southern Oscillation (ENSO) revealed no teleconnection with tree growth. The tree rings of this species are thus an indicator for monsoon precipitation variations in Bangladesh. The wider distribution of this species from the South to South East Asian coast presents an outstanding opportunity for developing a large-scale tree-ring network of mangroves.

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“…Both calculated vessel variables theoretically reflect a higher water‐transporting capacity of the latewood. However, Mwangi Theuri et al . (1999) measured lower stomatal conductivity, transpiration rates and photosynthetic rates in R. mucronata of Gazi Bay, Kenya (our study site) during the dry season.…”

Section: Discussionmentioning

confidence: 99%

High‐resolution time series of vessel density in Kenyan mangrove trees reveal a link with climate

Verheyden

Ridder

Schmitz³

et al. 2005

New Phytologist

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• Tropical trees are often excluded from dendrochronological investigations because of a lack of distinct growth ring boundaries, causing a gap in paleoclimate reconstructions from tropical regions. • The potential use of time series of vessel features (density, diameter, surface area and hydraulic conductivity) combined with spectral analysis as a proxy for environmental conditions in the mangrove Rhizophora mucronata was investigated. • Intra-annual differences in the vessel features revealed a trade-off between hydraulic efficiency (large vessels) during the rainy season and hydraulic safety (small, more numerous vessels) during the dry season. In addition to the earlywood-latewood variations, a semiannual signal was discovered in the vessel density and diameters after Fourier transformation. • The similarity in the Fourier spectra of the vessel features and the climate data, in particular mean relative humidity and precipitation, provides strong evidence for a climatic driving force for the intra-annual variability of the vessel features. The high-resolution approach used in this study, in combination with spectral analysis, may have great potential for the study of climate variability in tropical regions.

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Photosynthesis and related physiological processes in two mangrove species, Rhizophora mucronata and Ceriops tagal, at Gazi Bay, Kenya

Cited by 14 publications

References 8 publications

Controls on mangrove forest‐atmosphere carbon dioxide exchanges in western Everglades National Park

Controls on mangrove forest‐atmosphere carbon dioxide exchanges in western Everglades National Park

Climatic Signals in Tree Rings of Heritiera fomes Buch.-Ham. in the Sundarbans, Bangladesh

High‐resolution time series of vessel density in Kenyan mangrove trees reveal a link with climate

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