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Baldwin, Andrew H.; Egnotovich, Michael S.; Ford, Mark; Platt, William

doi:10.1023/a:1013941304875

Cited by 122 publications

(36 citation statements)

References 32 publications

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“…This irony is most likely related to severe disturbance from Hurricane Wilma, which caused massive mortality of mangrove trees at site SRM . As documented by previous studies, killing of the tall Rhizophora trees in the canopy trees lowered the population and flowering rate of Rhizophora and provided opportunities for heliophytic herbaceous plants to colonize (Smith et al, 1994Baldwin et al, 1995Baldwin et al, , 2001Vegas-Vilarrúbia and Rull, 2002;Piou et al, 2006;Hogarth, 2007;Thaxton et al, 2007). A distinct increase in Poaceae in the pollen diagram may represent early successional vegetation communities due to gap creation (Zhang et al, 2012).…”

Section: Discussionmentioning

confidence: 76%

Changes in Modern Pollen Assemblages and Soil Geochemistry along Coastal Environmental Gradients in the Everglades of South Florida

Yao

Liu

2018

Front. Ecol. Evol.

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This study aims to document the changes in modern pollen assemblages and soil elemental chemistry along broad edaphic, hydrological, and salinity gradients, including a previously undocumented secondary environmental gradient, in a vast mangrove-dominated wetland region in the Everglades, South Florida. Twenty-five soil surface samples were collected along an interior wetland transect and an estuarine mangrove transect across coastal zones in the Everglades National Park and subjected to palynological and XRF analyses. Modern pollen spectra from the sampling sites were classified into five a priori groups-wet prairie, pineland, inland mangroves, coastal mangroves, and fringe mangroves, based on the five vegetation types and sub-environments from which they were collected. Discriminant analysis shows that all (100%) of the samples are correctly classified into their a priori groups. On a broad scale, the modern pollen assemblages in surface samples collected from different vegetation types reflect the primary environmental gradient in the Florida Coastal Everglades. A distinct salinity and chemical gradient is also recorded in the XRF results, and the complexity of these gradients is captured at both regional and local scales. At the regional scale, concentrations of all the elements increase from terrestrial toward coastal sites. At the local scale, XRF results show a progressive decrease in most chemical concentrations and in the Cl/Br and Ca/Ti ratios away from the Shark River Slough at each individual site, suggesting that a secondary fluvial/tidal gradient also exists locally as a function of the distance from the river, the main carrier of these chemicals. This study provides new evidence to show that tidal flooding from the Shark River Estuary is directly related to the nutrient availability in the surrounding mangrove forests. These data will deepen our understanding of the environmental drivers behind the vegetation zonation in the region, especially in the mangrove ecosystems, and fill a gap in the pollen data network for the Everglades.

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Section: Discussionmentioning

confidence: 76%

Changes in Modern Pollen Assemblages and Soil Geochemistry along Coastal Environmental Gradients in the Everglades of South Florida

Yao

Liu

2018

Front. Ecol. Evol.

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“…The model results showed that the presence of positive feedback between mangrove trees and seedling survival may enable mangroves to exist in (and expand to) areas where unaided establishment is unsuccessful. Conversely, after deforestation and severe erosion previously inhabited areas could become unsuitable for natural recovery not only due to changes in for instance inundation times (Baldwin et al 2001;Bosire et al 2008;Blasco et al 1996;Ferwerda et al 2007), but through loss of the positive feedback that allowed establishment in the first place. This confirms the hypothesis that a (Ferwerda et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Local positive feedback and the persistence and recovery of fringe Avicennia marina (Forssk.) vierh. mangroves

Huisman

Langevelde

Boer

2009

Wetlands Ecol Manage

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While mangrove restoration efforts are reasonably successful, failure often occurs in high wave energy situations. Due to differences in wave energy, seedling mortality rates vary strongly with position on the intertidal flat between high water spring and high water neap elevations. However, a local positive feedback can be present between the pneumatophores of adult mangroves and the survival of mangrove seedlings to trigger recovery. In this study, a mangrove population of Avicennia marina is modelled to determine the effects of seedling mortality and local positive feedback on mangrove recovery. The model uses life history data and dispersal to simulate population dynamics. The mangrove range limits are determined by high water spring and high water neap levels. The results indicate that within these limits mangrove populations with life-history parameter values as derived from literature are indeed capable of fast growth under conditions with low seedling mortality. Local positive feedback has then a small positive influence on population recovery after mangrove loss. If, however, mortality rates increase, such as in high wave energy situations, the importance of a positive feedback increases. The model shows that a positive feedback may, given high seedling mortality rates, be an important factor for mangrove recovery. While a positive feedback may enable mangrove persistence in unfavourable conditions, destruction of adult mangroves can remove the positive feedback, which would render the system uninhabitable and practically prohibits reforestation of such areas. The model results and the presence of positive feedbacks and their importance for population dynamics in harsh conditions indicate that investigating and understanding possible feedbacks could be crucial for successful restoration efforts.

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“…The replacement of the floristic taxon cluster 1 by the fallow land in 2008 ( Figure 6) according to the unsupervised classification and the replacement of the NDVI value range of 0.24-0.34 by the less healthy NDVI value range of 0-0.08 ( Figure 6) may represent the complete destruction of the floristic taxon cluster 1 in the catchments of the cyclone trajectory. But this is impossible since mangrove is slow growing vegetation (Baldwin et al, 2001;Komiyamaa et al, 2008;Smith, 1998) and most of the mangrove seedlings need at least 10 years to be matured. Therefore, a complete destruction of floristic taxon cluster 1 and its regeneration within 1 year (by 2009) is merely impossible.…”

Section: Ndvi Analysesmentioning

confidence: 99%

“…They can cause temporary or permanent absence in the number and relative abundance of particular floristic taxa. Baldwin et al (2001) state that the time required for the regeneration of mangrove forests following cyclones depends on the different pathways. The pathways are This study identifies the degree of damage and quantifies the extent of damage of the floristic diversity of the Sundarbans caused by the tropical cyclone Sidr in 15 November 2007 applying remote sensing techniques.…”

Section: Introductionmentioning

confidence: 99%

Cyclone Sidr Impacts on the Sundarbans Floristic Diversity

Bhowmik¹,

Cabral²

2013

ESR

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The Sundarbans -the world's largest single block of tidal halophytic mangrove forest situated at the southwest of Bangladesh, plays a vital role in maintaining environmental sustainability of the country and the world in general. This study identified and quantified the extent and degree of damage caused to the floristic diversity of the Sundarbans by the tropical cyclone Sidr in 15 November 2007. It also quantified the extent and rate of the post-cyclone regeneration in the damaged flora. Unsupervised classification -ISODATA and the normalized difference vegetation index (NDVI) were carried out over a temporal series of 2007-2010 on four Landsat 7 Enhanced Thematic Mapper Plus (ETM +) images for the months of February. Land change analysis from the classification results show that three important floristic taxa -Heritiera fomes (Sundari), Excoecaria agallocha (Gewa) and Sonneratia apetala (Kewra) have been significantly affected by the cyclone. NDVI analysis indicates that 45% area of the Bangladesh's part of the Sundarbans (approximately 2500 sq.km) was affected due to the cyclone action. Results further indicated that the average rate of post-cyclone floristic growth in 2009-2010 is four times higher than the average rate in [2008][2009]. Thus the study identified a temporary loss of the diversity (in terms of relative abundance) in the affected three floristic taxa of the Sundarbans after that severe exogenous perturbation; which took three years to regenerate. Moreover, it showed the higher efficiency and promptness of remote sensing techniques in similar cases than the ground data based studies.

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Cited by 122 publications

References 32 publications

Changes in Modern Pollen Assemblages and Soil Geochemistry along Coastal Environmental Gradients in the Everglades of South Florida

Changes in Modern Pollen Assemblages and Soil Geochemistry along Coastal Environmental Gradients in the Everglades of South Florida

Local positive feedback and the persistence and recovery of fringe Avicennia marina (Forssk.) vierh. mangroves

Cyclone Sidr Impacts on the Sundarbans Floristic Diversity

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