Ecophysiology of a Mangrove Forest in Jobos Bay, Puerto Rico

Lugo, Ariel E.; Medina, Ernesto; Cuevas, Elvira; Cintrón, Gilberto; Nieves, Eddie N. Laboy; Novelli, Y Schaeffer; Piedras, Río

doi:10.18475/cjos.v43i2.a6

Cited by 42 publications

(41 citation statements)

References 29 publications

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“…The differences in Ca concentrations among the species studied confirm previous reports from tropical mangrove sites where these species occur together (Lacerda et al, 1986a;Medina et al, 2001;Barboza et al, 2006;Lugo et al, 2007). Calcium is an element capable of counteracting excess of Na ions in the interstitial water surrounding the roots by stabilizing membranes in root cells (Epstein, 1998) supporting the absorption of K, therefore, its presence in the soil solution may improve tolerance to high levels of salinity.…”

Section: Plantssupporting

confidence: 89%

“…The N and P concentrations are within the upper range of variation in mangroves elsewhere indicating that the sediments in these mangrove sites are quite fertile as suggested also by the soil analyses (Lacerda et al, 1985;Medina et al, 2001;Bernini et al, 2006;Lugo et al, 2007;Medina et al, 2010). Besides, the N/P molar ratios are all below 30 for the mangrove species, and slightly above 30 in the associated species, well below the values reported from P-limited mangroves in the Caribbean .…”

Section: Plantssupporting

confidence: 56%

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Heterogeneity of elemental composition and natural abundance of stables isotopes of C and N in soils and leaves of mangroves at their southernmost West Atlantic range

et al. 2016

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Mangrove communities were selected in the state of Santa Catarina, Brazil, near their southernmost limit of distribution, to study mineral nutrient relation in soils and plants. Communities included three true mangrove species, Rhizophora mangle, Laguncularia racemosa and Avicennia germinans, and two associated species, the fern Acrostichum danaeifolium, and the grass Spartina densiflora. The sites included communities in the lower Río Tavares near Florianopolis city, Sonho beach near Palhoça city, and the Santo Antonio lagoon. These sites included a full range of mangroves under humid climate where winter temperatures, instead of salinity, may be the main factor regulating their productive capacity and species composition. Soil salinity was determined by the concentration of soluble Na, and soil C and N were linearly correlated indicating their association in organic matter. Tavares site showed higher specific conductivity, and concentrations of Na and Mg in the soil layer below 40 cm depth, indicating larger influence of marine water. Isotopic signature of C increased with soil depth suggesting that microorganisms decomposing organic matter are releasing 13 C depleted CO 2 . Nitrogen isotopic signature decreased with soil depth, indicating enrichment in 15 N possibly as a result of denitrification in the upper soil layers. Mineral elements in leaf tissues showed A. schaueriana with higher concentrations of N, P, Na, K, Cu, Zn, and Na/Ca ratio. Spartina densiflora was characterized by the lowest N and K concentrations, and the highest concentrations of Al and Fe. Rhizophora mangle and L. racemosa had the highest Ca concentrations. Carbon isotopic signatures identified S. densiflora as a C4 plant, and A. schaueriana as the mangrove species occupying comparatively more water stressed microsites than the rest. Leaf nitrogen isotopic signatures were positive, in correspondence with the soil values. The results support the hypothesis that sites sampled were comparatively fertile, because sediment transport through fresh water run-off is predominant in humid coasts, and therefore plants were not limited by nutrient supply, nor particularly stressed by soil salinity.Keywords: mangroves, soils, leaves, nutrients, stable isotopes, southwestern Atlantic latitudinal limit.Heterogeneidade da composição elementar e abundância natural de isótopos estáveis de C e N no solo e folhas dos manguezais no extremo sul da sua distribuição na costa Atlântica ocidental

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Section: Plantssupporting

confidence: 89%

Section: Plantssupporting

confidence: 56%

Heterogeneity of elemental composition and natural abundance of stables isotopes of C and N in soils and leaves of mangroves at their southernmost West Atlantic range

et al. 2016

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“…It is interesting to note that the reflectance of the dwarf black mangrove was slightly lower than that for the poor condition black mangrove even though the difference was not significant (p > 0.01). In contrast to healthy black mangroves, dwarf black mangroves are typically found in sub-optimal conditions generally characterized by limited nutrients and freshwater [37][38][39][40]. Consequently, their height is generally not more than 1.5 m, as observed in our study site (Figure 1).…”

Section: Spectral Properties Of Mangrove Species and Conditionsmentioning

confidence: 49%

“…The dwarf red leaves were the most yellowish and consequently had the strongest reflectance in the red spectrum. Moreover, stressed mangrove leaves are generally smaller and thicker [31,37] and, thus, should have higher reflectance in the NIR region. In contrast, the reflectance of the stressed mangroves in our study was shown to be generally lower than the healthy mangroves in the NIR region.…”

Section: Spectral Properties Of Mangrove Species and Conditionsmentioning

confidence: 99%

Separating Mangrove Species and Conditions Using Laboratory Hyperspectral Data: A Case Study of a Degraded Mangrove Forest of the Mexican Pacific

et al. 2014

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Given the scale and rate of mangrove loss globally, it is increasingly important to map and monitor mangrove forest health in a timely fashion. This study aims to identify the conditions of mangroves in a coastal lagoon south of the city of Mazatlán, Mexico, using proximal hyperspectral remote sensing techniques. The dominant mangrove species in this area includes the red (Rhizophora mangle), the black (Avicennia germinans) and the white (Laguncularia racemosa) mangrove. Moreover, large patches of poor condition black and red mangrove and healthy dwarf black mangrove are commonly found. Mangrove leaves were collected from this forest representing all of the aforementioned species and conditions. The leaves were then transported to a laboratory for spectral measurements using an ASD plot, principal components analysis and stepwise discriminant analyses were then used to select wavebands deemed most appropriate for further mangrove classification. Specifically, the wavebands at 520, 560, 650, 710, 760, 2100 and 2230 nm were selected, which correspond to chlorophyll absorption, red edge, starch, cellulose, nitrogen and protein regions of the spectrum. The classification and validation indicate that these wavebands are capable of identifying mangrove species and mangrove conditions common to this degraded forest with an overall accuracy and Khat coefficient higher than 90% and 0.9, respectively. Although lower in accuracy, the classifications of the stressed (poor condition and dwarf) mangroves were found to be satisfactory with accuracies higher than 80%. The results of this study indicate that it could be possible to apply laboratory hyperspectral data for classifying mangroves, not only at the species level, but also according to their health conditions.

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“…Mangrove communities dominated by Rhizophora mangle, a salt excluder sensu (Scholander et al, 1962), and Laguncularia racemosa, a salt-secreting species with succulent leaves (Biebl and Kinzel, 1965;Tomlinson, 1986;Lugo et al, 2007;Sobrado, 2004), occur in the northern coast of South America in contiguous areas under similar climatic, edaphic, and salinity conditions. Both species are tolerant of high soil interstitial water salinity but differ in their tolerance to flooding, presence of salt-secreting glands, and the nature of compatible solutes accumulated in their leaves (Tomlinson, 1986;Medina et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Element uptake, accumulation, and resorption in leaves of mangrove species with different mechanisms of salt regulation

2015

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Abstract. Element uptake from substrate and resorption capacity of nutrients before leaf shedding are frequently species-specific and difficult to determine in natural settings. We sampled populations of Rhizophora mangle (salt-excluding species) and Laguncularia racemosa (salt-secreting species) in a coastal lagoon in the upper section of the Maracaibo strait in western Venezuela to estimate accumulation and resorption of mineral elements. Leaves collected fortnightly during 4 months within the rainy season were stratified as young, adult, old, and senescent. We measured changes in concentration of essential elements (N, P, S, K, Mg, Ca, Mn, Fe) and Na (elemental analyzer and plasma spectrometer), leaf succulence (water/area), and specific leaf area (area/mass) and calculated relative resorption or accumulation of elements in senescent leaves before abscission. Succulence was similar in young leaves of both species and increased with age, more abruptly in L. racemosa. Concentrations of N, K, and Mg were higher in R. mangle, whereas those of P, Na, Ca, and S were higher in L. racemosa. Concentration of K per unit leaf water decreased with age in both species; however, Na concentration in R. mangle remained at a similar level until increasing markedly in senescent leaves, whereas in L. racemosa it increased throughout the leaf lifespan. Relative changes based on leaf mass, leaf area, or whole leaf did not differ statistically. On a leaf mass basis both species showed resorption of C, N, P, and K and accumulation of S, Na, Mg, Ca, Mn, and Fe. However, R. mangle was more efficient restricting Na and S uptake, resorbing P, and accumulating Fe than L. racemosa. The P / N resorption ratio is > 1 in R. mangle and < 1 in L. racemosa. We conclude that those differences are related to higher root permeability to Na and S salts in the salt-secreting species and to higher P requirements of R. mangle compared to L. racemosa. Our results give a comprehensive picture of nutrient dynamics in the foliage of mangrove species with contrasting mechanisms of salt regulation.

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Ecophysiology of a Mangrove Forest in Jobos Bay, Puerto Rico

Cited by 42 publications

References 29 publications

Heterogeneity of elemental composition and natural abundance of stables isotopes of C and N in soils and leaves of mangroves at their southernmost West Atlantic range

Heterogeneity of elemental composition and natural abundance of stables isotopes of C and N in soils and leaves of mangroves at their southernmost West Atlantic range

Separating Mangrove Species and Conditions Using Laboratory Hyperspectral Data: A Case Study of a Degraded Mangrove Forest of the Mexican Pacific

Element uptake, accumulation, and resorption in leaves of mangrove species with different mechanisms of salt regulation

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