Remote Sensing of Mangrove Change Along the Tanzania Coast

Wang, Yeqiao; Bonynge, Gregory; Nugranad, Jarunee; Traber, Michael; Ngusaru, Amani; Tobey, James A.; Hale, Lynne Zeitlin; Bowen, Robert; Makota, Vedast

doi:10.1080/01490410306708

Cited by 112 publications

(89 citation statements)

References 8 publications

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“…[20,21] and their own experience and knowledge from other sources to make interpretive decisions. Thus, this method usually produces better classification if used by a skilled analyst [22,23]. The false color composites of the four images were visually interpreted through a screen digitizing.…”

Section: Land-cover Classificationmentioning

confidence: 99%

Deforestation and Changes in Landscape Patterns from 1979 to 2006 in Suan County, DPR Korea

Pang¹,

et al. 2013

Forests

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Abstract:The Democratic People's Republic of Korea (DPR Korea) suffered considerable upland deforestation during the 1990s, yet its consequences remain relatively unknown. This paper examines this deforestation and resulting land-use change patterns by analysis of Landsat satellite images from 1979, 1992, 2001 and 2006 in Suan County, Hwanghae Province, DPR Korea. Results show that there has been significant closed canopy forest loss and a dramatic expansion of agricultural land during this period. Most forestlands were converted to farmland during 1992 and 2001. Food shortages, along with fuelwood and timber extraction, are considered to be the main drivers of deforestation. Landscape analysis also showed that closed canopy forests have been severely fragmented and degraded. These research findings make a contribution to an insufficient body of literature on environmental issues in DPR Korea and helps to establish a baseline for monitoring land-use and land-cover changes in the country.

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Section: Land-cover Classificationmentioning

confidence: 99%

Deforestation and Changes in Landscape Patterns from 1979 to 2006 in Suan County, DPR Korea

Pang¹,

et al. 2013

Forests

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“…The clear-cutting of mangroves for salt production is therefore one of the most serious threats to mangrove ecosystems (Masalu, 2000;Kairo et al, 2001;Mazda et al, 2002;Wang et al, 2003;ISME, 2013). Along the coast, most salt is produced in solar ponds situated in mangrove areas, although it would be possible to relocate them outside the mangroves on bare land (Semesi, 1992).…”

Section: Introductionmentioning

confidence: 99%

Genetic erosion in the snailLittoraria subvittata(Reid, 1986) due to mangrove deforestation

2016

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In tropical coastal ecosystems mangrove forests are important as feeding, spawning, breeding and nursery grounds for many marine species. High human population pressure in coastal areas has led to the loss and deterioration of mangrove habitats. Solar salt production can affect these habitats along the East African coast. Littorinid snails live on mangrove trees, forming an important component of the mangrove ecosystem and have been used as bioindicators of environmental health and community stress. Littoraria subvittata is the most abundant littorinid species in mangroves along the East African coast. Partial mitochondrial cytochrome oxidase subunit 1 (COI) gene sequences of 298 individuals were used to assess the impact of mangrove deforestation at salt ponds on the genetic diversity and structuring of L. subvittata populations, as well as to infer the demographic history of the species. Nucleotide and haplotype diversities were found to be lower in samples from mangroves at salt ponds than in samples from natural mangroves. The mean nucleotide diversity was 0.049 ± 0.036% and 0.115 ± 0.068% in mangroves at salt ponds and natural mangroves, respectively. The mean haplotype diversity was 0.23 ± 0.14 and 0.50 ± 0.14 in mangroves at salt ponds and natural mangroves, respectively. Analysis of molecular variance (AMOVA) detected a significant population structure (Ф st = 0.049; P < 0.0001) for the combined populations. Hierarchical AMOVA detected a significant population genetic structure only between populations from mangroves at salt ponds and natural mangroves (Φ ct = 0.022; P < 0.05), but not between any other groupings. Populations from natural mangrove sites showed a significant genetic structure (Ф st = 0.054, P < 0.0001), while populations from sites at salt ponds could not be differentiated (Ф st = −0.0026, P = 0.64). Reduced effective population size was observed in most samples from mangrove sites at salt ponds compared with natural mangrove. The direction of migrants was mostly from salt ponds to natural mangroves. These results show that salt ponds have a negative impact on the genetic diversity of L. subvittata populations and modify the population's genetic structure.

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“…1). The Kunduchi Creek harbors mangrove forests with an estimated total surface area of 68.7 ha (Wang et al 2003). The creek has a narrow entrance to the ocean ~300 m wide, and is 2.2 km long from entrance to the origin.…”

Section: Study Areamentioning

confidence: 99%

Orientation from open water to settlement habitats by coral reef fish: behavioral flexibility in the use of multiple reliable cues

Igulu¹,

Nagelkerken

Beek³

et al. 2013

Mar. Ecol. Prog. Ser.

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Most coastal marine organisms have a dispersive oceanic larval stage, during which they must be able to distinguish and respond to relevant environmental cues when settling into their first benthic habitat. Chemical stimuli emanating from settlement habitats and being dispersed by water plumes could enable long-distance navigation by larval reef fish, but we know little about the cues responsible and their interactive effects. In the present study, we tested this by conducting several ex situ choice experiments in which the response of the coral reef fish Lutjanus fulviflamma towards different chemical cues from coastal habitats was tested close to their settlement stage. Fish preferred seagrass habitat water over that from coral reef and mangrove habitats. Furthermore, fish were attracted to chemical cues from their own species (conspecifics) and other fish species, as well as vegetation of 4 different seagrass species, when offered in isolation (i.e. soaked in neutral water), but a strong response remained only towards cues from conspecifics and seagrass leaves when these cues were mixed with seagrass habitat water that naturally contains other cues. Hierarchical effects were observed as fish preferred chemical cues from seagrass leaves over those from conspecifics when both were offered at the same time. The importance of visual habitat cues only overruled that of chemical cues when it concerned preferred cues (i.e. seagrass as opposed to mangrove cues). Our findings indicate that pelagic fish and settlers possess the ability to use multiple reliable chemical cues to locate suitable early life stage habitats, although the importance of these cues is context-dependent. Nevertheless, this flexibility in choice behavior is probably an adaptive strategy to enhance fitness by increasing successful orientation towards preferred settlement habitats.

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Remote Sensing of Mangrove Change Along the Tanzania Coast

Cited by 112 publications

References 8 publications

Deforestation and Changes in Landscape Patterns from 1979 to 2006 in Suan County, DPR Korea

Deforestation and Changes in Landscape Patterns from 1979 to 2006 in Suan County, DPR Korea

Genetic erosion in the snailLittoraria subvittata(Reid, 1986) due to mangrove deforestation

Orientation from open water to settlement habitats by coral reef fish: behavioral flexibility in the use of multiple reliable cues

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