Impact of Urbanization on the Evolution of Mangrove Ecosystems in the Wouri River Estuary (Douala Cameroon)

Cerithidea cingulata and Littoraria scabra are type of snail that use mangrove ecosystems as one of their habitat. Dumai is one of the industrial cities in the province of Riau, where various kinds of human activities can disrupt the ecosystem of mangroves and its associated biota. This research was conducted in October 2018 in the Mangrove Forest Area (PAB) of Pangkalan Sesai village of Dumai City, aiming to determine population densities and length-weight relationship of C. cingulata and L. scabra. The method used in this study is a survey method. Sampling was conducted by using the line transect method, where each station consists of 3 transects and each transect consists of 3 sampling points as replications. The results showed the population density of C. cingulata and L. scabra snails was higher than at stations near the Dumai river estuary compared with the population near by mangrove forest and length-weight relationship showed that the growth patterns of both C. cingulata and L. scabra were allometric negative and have strong correlation value.

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“Land fever” and “Bankruptcy”: Social Problems in Hanoi’s Urbanizing Peri-urban Communities

Tập chí Khoa học Xã hội và Nhân văn ◽

10.33100/jossh5.5.nguyenthithanhbinh ◽

2019 ◽

Vol 5 (5) ◽

pp. 550-562

Keyword(s):

Rural Communities ◽

Urban Communities ◽

Agricultural Production ◽

Social Problems ◽

Social Issues ◽

Field Research ◽

Credit Market ◽

Urbanization Process ◽

Impact Of Urbanization ◽

The Impact

Drawn upon field research in two peri-urban villages of Hanoi in 2014 and short re-visits recently, the research examines the widespread of gambling and other social issues in Hanoi’s urbanizing peri-urban communities which happened concurrently with the phenomenon of “land fever,” and at the time local villagers received compensation from land appropriation. The article aims to understand the impact of urbanization on these communities and the interface between urbanization and the increase of social problems. It argues that gambling, drug use, and other social problems have been existing in Vietnamese rural communities long before; however, when urbanization came, some people have higher chances to engage in these activities. Those are villagers who want to transform quickly into entrepreneurs or bosses by joining the “black credit” market and gambling. Together with middle-aged and old farmers who greatly relied on agricultural production and face difficulties in transforming their occupation, they formed the group of losers in the urbanization process. Received 6th January 2019; Revised 26th April 2019; Accepted 15th May 2019

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Detection of ostreid herpesvirus 1 microvariant DNA in aquatic invertebrate species, sediment and other samples collected from the Georges River estuary, New South Wales, Australia

Diseases of Aquatic Organisms ◽

10.3354/dao03078 ◽

2017 ◽

Vol 122 (3) ◽

pp. 247-255 ◽

Cited By ~ 16

Author(s):

O Evans ◽

I Paul-Pont ◽

RJ Whittington

Keyword(s):

New South ◽

New South Wales ◽

River Estuary ◽

Aquatic Invertebrate ◽

Invertebrate Species ◽

South Wales ◽

Herpesvirus 1 ◽

Ostreid Herpesvirus 1

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Climate-associated trends and variability in ichthyoplankton phenology from the longest continuous larval fish time series on the east coast of the United States

Marine Ecology Progress Series ◽

10.3354/meps13404 ◽

2020 ◽

Vol 650 ◽

pp. 269-287

Author(s):

WC Thaxton ◽

JC Taylor ◽

RG Asch

Keyword(s):

United States ◽

Environmental Variability ◽

Larval Fish ◽

Interspecific Interactions ◽

River Estuary ◽

Atlantic Multidecadal Oscillation ◽

The United States ◽

Larval Survival ◽

Ecological Communities ◽

Northerly Wind

As the effects of climate change become more pronounced, variation in the direction and magnitude of shifts in species occurrence in space and time may disrupt interspecific interactions in ecological communities. In this study, we examined how the fall and winter ichthyoplankton community in the Newport River Estuary located inshore of Pamlico Sound in the southeastern United States has responded to environmental variability over the last 27 yr. We relate the timing of estuarine ingress of 10 larval fish species to changes in sea surface temperature (SST), the Atlantic Multidecadal Oscillation, the North Atlantic Oscillation, wind strength and phenology, and tidal height. We also examined whether any species exhibited trends in ingress phenology over the last 3 decades. Species varied in the magnitude of their responses to all of the environmental variables studied, but most shared a common direction of change. SST and northerly wind strength had the largest impact on estuarine ingress phenology, with most species ingressing earlier during warm years and delaying ingress during years with strong northerly winds. As SST warms in the coming decades, the average date of ingress of some species (Atlantic croaker Micropogonias undulatus, summer flounder Paralichthys dentatus, pinfish Lagodon rhomboides) is projected to advance on the order of weeks to months, assuming temperatures do not exceed a threshold at which species can no longer respond through changes in phenology. These shifts in ingress could affect larval survival and growth since environmental conditions in the estuarine and pelagic nursery habitats of fishes also vary seasonally.

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Impact of Urbanization on Land Use/Land Cover — Case Study: The Western Part of Khartoum State, Sudan

Modern Environmental Science and Engineering ◽

10.15341/mese(2333-2581)/04.03.2017/007 ◽

2017 ◽

Vol 04 (03) ◽

pp. 272-277

Author(s):

Tawhida A. Yousif ◽

Nancy I. Abdalla ◽

El-Mugheira M. Ibrahim ◽

Afraa M. E. Adam

Keyword(s):

Land Use ◽

Land Cover ◽

Land Use Land Cover ◽

Impact Of Urbanization

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Phytoplankton as an indicator ecological state of the neva river estuary, 2011-2015

Сибирский экологический журнал ◽

10.15372/sej20190310 ◽

2019 ◽

Keyword(s):

River Estuary ◽

Ecological State ◽

Neva River

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Species Density and Lead (Pb) Pollution in Mangrove Ecosystem, South Kalimantan

Jurnal Biodjati ◽

10.15575/biodjati.v5i1.7411 ◽

2020 ◽

Vol 5 (1) ◽

pp. 70-81

Author(s):

Anang Kadarsah ◽

Dafiuddin Salim ◽

Sadang Husain ◽

Marta Dinata

Keyword(s):

Heavy Metal ◽

Oil Palm ◽

Ph Value ◽

Coal Mines ◽

Organic Matter Content ◽

Mangrove Ecosystem ◽

Organic Content ◽

Species Density ◽

Pb Pollution ◽

Mangrove Ecosystems

Its crucial to get information about lead (Pb) heavy metal pollution from mining and oil palm plantation on species density in mangrove ecosystem, to anticipate its impacts. This study aimed is to compare the types and densities of vegetation in mangrove ecosystems allegedly due to mining in Setarap village, Tanah Bumbu Regency and oil palm plantations in Kuala Tambangan Village, Tanah Laut Regency. We also analysis the condition of waters (TDS, pH and DO) and organic content in sediments to acquire data from the South Kalimantan mangrove ecosystems. The results showed there were four species of true mangroves (Avicennia alba, Acanthus ebracteatus, Nypa fruticans and Rhizophora apiculate) could live well in the environment affected by mining or oil palm plantations. The species density for trees was low (933 ind/ha) for mangroves affected by coal mines, while those affected by oil palm plantations had higher densities (1,067 ind/ha). pH value of waters in affected area by coal mining showed more acidic value (pH 5.76) especially at the back, while those by palm oil plantations are more acidic (pH 6) in the estuary. Organic matter content in sediments affected by coal mines was in the range of 0.61-6.59%, while those affected by oil palm plantations showed higher values (0.12-2.19%). Lead heavy metal content (Pb) in waters affected by coal mines was 0.031-0.056 mg/L, while the area affected by oil palm plantations was of higher value (0.110-0.128 mg/L). Lead (Pb) levels in sediments indicate higher values than waters, which reach 3.512-6.046 mg/Kg (affected by coal mines), and in areas affected by oil palm plantations reaching 6.658-6.66 mg/Kg. The general conclusion is that vegetation densities in areas affected by coal mines are lower than oil palm plantations. The level of lead (Pb) pollution in the sediments is higher than in the waters.

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