Coastal environmental changes in Southeast Asia: A study from Quang Nam Province, Central Vietnam

Veettil, Bijeesh Kozhikkodan; Costi, Juliana; Marques, Wiliam Correa; Tran, Xuan-Linh; Quảng, Ngô Xuân; Van, Dong Doan; Hoài, Phạm Ngọc

doi:10.1016/j.rsma.2020.101420

Cited by 11 publications

(6 citation statements)

References 33 publications

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“…Marine urbanization is commonplace in Southeast Asia, a region which has experienced one of the highest rates of coastal population growth and resource exploitation globally (Jiang et al, 2001;Burke et al, 2011). The elevated demands for coastal resources and spaces, brought about by the sixfold increase in human populations between 1900 and 2000 (Jones, 2013), was met with the proliferation of port facilities, land reclamation and coastal protection via artificial structures (Jongman et al, 2012;Heery et al, 2018;Ma et al, 2019;Nelson Sella et al, 2019;Song et al, 2019;Veettil et al, 2020). The anthropogenic activities associated with these shoreline changes-dredging, reclamation, improper wastewater discharge and destructive fishing (Fortes, 1995;Duarte, 2002;Kirkman and Kirkman, 2002;Orth et al, 2006;Waycott et al, 2009;Yaakub et al, 2014;Unsworth et al, 2018), ensued losses of up to 50% of seagrass meadows in Southeast Asia (Macusi et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Dugongs (Dugong dugon) along hyper-urbanized coastlines

Ow²,

Jaafar³

2022

Front. Mar. Sci.

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Coastal development and the increased anthropogenic use of sea spaces have rapidly degraded coastal habitats throughout Southeast Asia. We study how these activities impact dugong (Dugong dugon) population(s) along hyper-urbanized coastlines of the Johor and Singapore Straits through literature reviews and field surveys. Our review recovered sixty-nine live observations and carcass observations of dugongs between 1820 and 2021. The eastern Johor Strait is identified as a dugong hotspot. We observed peaks in observations coincident with the Northeast and Southwest monsoons. Distribution patterns of dugong observations were likely driven by a combination of natural and anthropogenic factors such as seasonality in seagrass abundance, tidal cycles, wind patterns and vessel traffic. Our field surveys ascertained active foraging sites along the anthropogenically disturbed Johor Strait and western Singapore Strait. Evident from our study is the importance of reef-associated seagrass meadows as refugia for foraging dugongs along areas of high anthropogenic use. This study provides an ecological baseline for dugong research along the Johor and Singapore Straits—within the data-poor western Malay Archipelago—, and aids in the design of sustainable management strategies and conservation programs for dugongs along areas where urbanization is commonplace.

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Section: Introductionmentioning

confidence: 99%

Dugongs (Dugong dugon) along hyper-urbanized coastlines

Ow²,

Jaafar³

2022

Front. Mar. Sci.

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“…In addition, the coastal area of Viet Nam consists of numerous bays, estuaries, and beaches with dynamic variabilities in environmental conditions [e.g., depth, sediment characteristics, light, salinity, levels of anthropogenic pressures, seasonal changes, etc. ( Tang et al., 2004 ; Hanh and Furukawa, 2007 ; Veettil et al., 2020 , authors’ observations)]. Therefore, it is expected to have great intra-/inter-species-specific variations in ecological, morphological, and physiological traits among similar/different seagrass species in the country as previously demonstrated in several seagrass species from different regions ( Coyer et al., 2004 ; Jahnke et al., 2019a ; Nguyen et al., 2021 ).…”

Section: Ecology and Physiology Of Vietnamese Seagrasses Related To D...mentioning

confidence: 88%

Current advances in seagrass research: A review from Viet Nam

Nguyen¹,

Phan

Cao

et al. 2022

Front. Plant Sci.

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Seagrass meadows provide valuable ecosystem services but are fragile and threatened ecosystems all over the world. This review highlights the current advances in seagrass research from Viet Nam. One goal is to support decision makers in developing science-based conservation strategies. In recent years, several techniques were applied to estimate the size of seagrass meadows. Independent from the method used, there is an alarming decline in the seagrass area in almost all parts of Viet Nam. Since 1990, a decline of 46.5% or 13,549 ha was found. Only in a few protected and difficult-to-reach areas was an increase observed. Conditions at those sites could be investigated in more detail to make suggestions for conservation and recovery of seagrass meadows. Due to their lifestyle and morphology, seagrasses take up compounds from their environment easily. Phytoremediation processes of Thalassia hemprichii and Enhalus acoroides are described exemplarily. High accumulation of heavy metals dependent on their concentration in the environment in different organs can be observed. On the one hand, seagrasses play a role in phytoremediation processes in polluted areas; on the other hand, they might suffer at high concentrations, and pollution will contribute to their overall decline. Compared with the neighboring countries, the total Corg stock from seagrass beds in Viet Nam was much lower than in the Philippines and Indonesia but higher than that of Malaysia and Myanmar. Due to an exceptionally long latitudinal coastline of 3,260 km covering cool to warm water environments, the seagrass species composition in Viet Nam shows a high diversity and a high plasticity within species boundaries. This leads to challenges in taxonomic issues, especially with the Halophila genus, which can be better deduced from genetic diversity/population structures of members of Hydrocharitaceae. Finally, the current seagrass conservation and management efforts in Viet Nam are presented and discussed. Only decisions based on the interdisciplinary cooperation of scientists from all disciplines mentioned will finally lead to conserve this valuable ecosystem for mankind and biodiversity.

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“…Central Vietnam is considered one of the most hazard-prone regions to climate variability, especially typhoons and floods due to its long coastline, hot and humid climate conditions, and geographical disadvantage [ 3 , 8 , 48 , 49 ]. In the study, the field surveys were specifically conducted in two mountain communes – Song Kon (SK), Dong Giang district; and Tra Doc (TD), Bac Tra My district, Quang Nam Province, Central Vietnam ( Fig.…”

Section: Methodsmentioning

confidence: 99%