Impact of soil salinity on mangrove restoration in a semiarid region: a case study from the Saloum Delta, Senegal

Devaney, John L.; Marone, Diatta; McElwain, Jennifer C.

doi:10.1111/rec.13186

Cited by 18 publications

(11 citation statements)

References 56 publications

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“…Several authors [55,56] associate the H of this type of mangrove to stress caused by nutrient deficiency, hydrological stress, and S i , which depend on the flow and level of the tide, as seen in the BMF. Although A. germinans are believed to perform better between seasons, the R. mangle were the trees that recorded higher H and DBH values, which could be associated to constant S i resulting in a smaller BA in the short-term (<20 years) [57,58]. However, it is appreciated that DBH varies according to the species and the MF type.…”

Section: Discussionmentioning

confidence: 96%

Local Drivers Associated to Temporal Spectral Response of Chlorophyll-a in Mangrove Leaves

et al. 2021

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The pigment content in leaves has commonly been used to characterize vegetation condition. However, few studies have assessed temporal changes of local biotic and abiotic factors on leaf pigments. Here, we evaluated the effect of local environmental variables and tree structural characteristics, in the chlorophyll-a leaf concentration (Chl-a) associated with temporal change in two mangrove species. Rhizophora mangle (R. mangle) and Avicennia germinans (A. germinans) trees of a fringe mangrove forest (FMF) and lower basin mangrove forest (BMF) were visited over a period of one year, to obtain radiometric readings at leaf level to estimate Chl-a. Measurements on tree characteristics included diameter at breast height (DBH), basal area (BA), and maximum height (H). Environmental variables included soil interstitial water temperature (Ti), salinity (Si), and dissolved oxygen (Oi), flood level (fL), ambient temperature (Tamb), and relative humidity (Hrel). Generalized linear models and covariance analysis showed that the variation of Chl-a is mainly influenced by the species, the interaction between species and mangrove forest type, DBH, seasonality and its influence on the species, soil conditions, and fL. Studies to assess spatial and temporal change on mangrove forests using the spectral characteristics of the trees should also consider the temporal variation of leave chlorophyll-a concentration.

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Section: Discussionmentioning

confidence: 96%

Local Drivers Associated to Temporal Spectral Response of Chlorophyll-a in Mangrove Leaves

et al. 2021

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“…However, the development of mangrove ecosystems in the high intertidal zone as a refuge to SLR will depend on the successful integration of complex ecological processes to overcome hydrological estimations. Focusing interventions solely on the planting of mangrove seedlings in unvegetated salt flats will likely fail (Devaney et al 2021). Instead, the expansion of mangroves along ecotones should be assisted through the establishment of herbaceous ground vegetation (Kettenring & Tarsa 2020) and the creation of a concave-convex microtopography, if necessary, through digging (Qiu et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Aerial surveys reveal biotic drivers of mangrove expansion along a Thai salt flat ecotone

Pranchai

Jenke

Pokavanich

et al. 2022

Restoration Ecology

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Rapid sea level rise (SLR) could overwhelm the adaptive capacity of many mangrove forests. The conservation of functional mangrove ecosystems will rely on their expansion into upper intertidal areas, including salt marshes and salt flats, in advance of SLR. The development of new mangrove habitats could be accelerated by amplifying positive biotic interactions among herbaceous plants, macrofauna, and mangrove trees, such as trapping of hydrochorous propagules or site amelioration. It was investigated how biotic and abiotic factors influenced the expansion of mixed-species mangrove stands along a mangrove-salt flat ecotone. Multi-temporal unmanned aerial vehicle (UAV) imagery (< 1 cm/pixel) was used to monitor seedlings of Avicennia alba, Bruguiera cylindrica, and Lumnitzera racemosa in three sample plots (0.7-0.9 ha) over 2 years. The aerial images were used to map mangrove crowns, sedges (Fimbristylis tetragona), substrate elevation, and microtopography. The spatial distribution of seedlings was modeled using point pattern processes; mixed-effects models were used to analyze how environmental factors influenced seedling survival and growth. The spatio-temporal patterns of mangrove regeneration revealed that sedges and macrofauna facilitated the regeneration of mangroves into higher-elevated areas of low tree density. Sedges not only trapped seeds but also increased the likelihood of survival among seedlings of all species. Large-sized propagules established in undulating microtopography created through the bioturbation of macrofauna. Herbaceous vegetation expanded the range of macrofauna in the absence of trees. Thus, the migration of mangroves into hypersaline retreat areas may be accelerated by enhancing the growth of herbaceous vegetation and promoting burrowing macrofauna.

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“…It is worth mentioning that this study was conducted in a mangrove forest with low salinity variation. Salinity is one of the important factors influencing the growth of different mangrove species and the success of ecosystem function restoration (Devaney et al 2020). The variation of salinity directly affects the differences of soil nutrients.…”

Section: Responsive Plant Traitsmentioning

confidence: 99%

Comparative impact of light and neighbor effect on the growth of introduced speciesSonneratia apetalaand native mangrove species in China: implications for restoration

Zhu

Hui

Huang

et al. 2021

Restoration Ecology

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Light condition and neighbor effects are important environmental factors that need to be considered for restoration of mangroves, especially when introduced species are mixed with native species. To evaluate different mangrove species performance under various light intensities and different planting systems, we selected three native mangrove species (Avicennia marina, Aegiceras corniculatum, and Kandelia obovata) and grew them with Sonneratia apetala in multispecies plots and in monospecies plots without S. apetala under three light conditions in Futian Nature Reserve, south China. After 10 months of the experiment, plant functional traits were measured. The results showed that S. apetala was a light-demanding species and A. corniculatum and A. marina were suitable for growth under the medium light condition. The native species were inhibited by S. apetala. Specifically, the height and basal diameter of the native species were lower in the multispecies plots than in the monospecies plots. In the multispecies plots, native species changed their functional growth traits, with higher-specific leaf area and chlorophyll content, and reduced leaf thickness, leaf dry-mass content, and carotenoid content compared to those in the monospecies plots. These results indicated trade-offs between traits that enhance light interception and traits that stimulate plant growth in native species. Our findings revealed that S. apetala is an adequate species with good invasion capability for restoration in opendegraded areas, but its ecological impact on the inhibited growth of native species should be carefully considered in mangrove restoration.

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Impact of soil salinity on mangrove restoration in a semiarid region: a case study from the Saloum Delta, Senegal

Cited by 18 publications

References 56 publications

Local Drivers Associated to Temporal Spectral Response of Chlorophyll-a in Mangrove Leaves

Local Drivers Associated to Temporal Spectral Response of Chlorophyll-a in Mangrove Leaves

Aerial surveys reveal biotic drivers of mangrove expansion along a Thai salt flat ecotone

Comparative impact of light and neighbor effect on the growth of introduced speciesSonneratia apetalaand native mangrove species in China: implications for restoration

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