Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 2: microfossil multiproxy reconstruction of the Santo André coastal area

The Holocene ◽  
2003 ◽  
Vol 13 (3) ◽  
pp. 447-458 ◽  
Author(s):  
Alejandro Cearreta ◽  
Mário Cachão ◽  
M. Cristina Cabral ◽  
Roberto Bao ◽  
Maria de Jesus Ramalho
Keyword(s):  
Coastal Area ◽  
Environmental Changes ◽  
Coastal Lagoons

Lateglacial and Holocene environmental changes in Portuguese coastal lagoons 1: the sedimentological and geochemical records of the Santo André coastal area

The Holocene ◽  
2003 ◽  
Vol 13 (3) ◽  
pp. 433-446 ◽  
Author(s):  
Maria da Conceição Freitas ◽  
César Andrade ◽  
Fernando Rocha ◽  
Colombo Tassinari ◽  
José Manuel Munhá ◽  
...  
Keyword(s):  
Coastal Area ◽  
Environmental Changes ◽  
Coastal Lagoons

scholarly journals Dynamics of the Methanogenic Archaea in Tropical Estuarine Sediments

Archaea ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
María del Rocío Torres-Alvarado ◽  
Francisco José Fernández ◽  
Florina Ramírez Vives ◽  
Francisco Varona-Cordero
Keyword(s):  
Organic Carbon ◽  
Environmental Variables ◽  
Environmental Changes ◽  
Coastal Lagoons ◽  
Spatial Dynamics ◽  
Methanogenic Archaea ◽  
Estuarine Sediments ◽  
Microbiological Analysis ◽  
Methanogenic Community ◽  
Solids Content

Methanogenesis may represent a key process in the terminal phases of anaerobic organic matter mineralization in sediments of coastal lagoons. The aim of the present work was to study the temporal and spatial dynamics of methanogenic archaea in sediments of tropical coastal lagoons and their relationship with environmental changes in order to determine how these influence methanogenic community. Sediment samples were collected during the dry (February, May, and early June) and rainy seasons (July, October, and November). Microbiological analysis included the quantification of viable methanogenic archaea (MA) with three substrates and the evaluation of kinetic activity from acetate in the presence and absence of sulfate. The environmental variables assessed were temperature, pH, Eh, salinity, sulfate, solids content, organic carbon, and carbohydrates. MA abundance was significantly higher in the rainy season (106–107 cells/g) compared with the dry season (104–106 cells/g), with methanol as an important substrate. At spatial level, MA were detected in the two layers analyzed, and no important variations were observed either in MA abundance or activity. Salinity, sulfate, solids, organic carbon, and Eh were the environmental variables related to methanogenic community. A conceptual model is proposed to explain the dynamics of the MA.

scholarly journals Biomonitoring application using macrozoobenthic assemblanges at coastal area of Menjangan Besar Island, Kepulauan Karimunjawa, Indonesia

2020 ◽  
Vol 16 (3) ◽  
pp. 292-296
Author(s):  
Rafita Farantika ◽  
Sapto Purnomo Putro ◽  
Agus Indarjo
Keyword(s):  
Organic Matter ◽  
Coastal Area ◽  
Environmental Changes ◽  
Marine Ecosystem ◽  
Organic Matter Content ◽  
Water Current ◽  
Sampling Location ◽  
Physical Factors ◽  
Environmental Disturbance ◽  
Macrobenthic Assemblages

The macrozoobenthic structure inhabiting marine ecosystem may be used as a bioindicator of changes in aquatic environmental disturbance. This study is aimed to assess environmental disturbance by application of biomonitoring using macrozoobenthic assemblages at coastal area of Menjangan Besar Island, Kepulauan Karimunjawa, Indonesia. The macrozoobenthic assemblages were assessed at two sampling locations, i.e. floating net cage of monoculture and reference areas. Each sampling location consisted of three stations with three replicates for each station. The samples were taken in two sampling times, i.e. August and November 2018. Data of abiotic parameters included the composition of organic matter content, sediment substrates, DO, pH, salinity, temperature, and water current. Sediments were sampled using Ekman grab from 15 m deep. The relationship between biotics (macrozoobenthos) and abiotics (physical-chemical factors) was assessed using a non-parametric multivariate procedure (BIO-ENV; Primer 6.1.5). Macrobenthic assemblages consisted of 89 species with the total abundance of 50,071 individuals/m2, consisting of 52 families and 4 classes of macrozoobenthos. The values of indices were ranging from 2,54-3,40 for diversity index (H'), 0,99 for Pielou’s evenness index (e’), and 0,09-0,17 for dominance index (C). The most common classes were a member of Gastropods and bivalves. Diversity and evennes indices exhibited differed by location (monoculture vs reference) and time sampling. Fluctuation of macrobenthic structure was considered as a results of environmental changes spatially and temporally, especially sediment composition and food availability as the form of organic matter. Nitrogen and silt were the most chemical and physical factors influencing the structure of macrozoobenthos (r = 0,632; BIO-ENV).

Extending the applicability of the REVEALS model for pollen-based vegetation reconstructions to coastal lagoons

The Holocene ◽  
2019 ◽  
Vol 29 (7) ◽  
pp. 1109-1112
Author(s):  
Julien Azuara ◽  
Florence Mazier ◽  
Vincent Lebreton ◽  
Shinya Sugita ◽  
Nicolas Viovy ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Coastal Lagoons ◽  
Pollen Dispersal ◽  
Local Scale ◽  
Mechanistic Models ◽  
Pollen Data ◽  
Plant Abundance ◽  
Quantitative Reconstruction ◽  
Quantitative Estimates ◽  
Lake Deposits

Quantitative reconstruction of past plant abundance from fossil pollen data is still a challenging task for palynologists. During the last decades, mechanistic methods have been developed to convert pollen assemblages from peat and lake deposits into vegetation abundance at regional and local scale. Coastal areas are particularly sensitive to climate and environmental hazards. Thus, quantitative estimates of past vegetation are important to better understand their history and address potential effects of future environmental changes. However, assumptions of the mechanistic models of pollen dispersal and deposition originally designed for near-circular lakes and bogs located inland are violated when applied to coastal sites because of different basin shape and wind direction distribution. This study investigates how to adapt a model of pollen dispersal and deposition developed for lakes to coastal lagoons. A new geometry is defined, and it is demonstrated how some of the major formulas from previous models can be used without any modification in this singular context.

scholarly journals Benthic ecology of tropical coastal lagoons: Environmental changes over the last decades in the Términos Lagoon, Mexico

2017 ◽  
Vol 349 (6-7) ◽  
pp. 319-329 ◽  
Author(s):  
Christian Grenz ◽  
Renaud Fichez ◽  
Carlos Álvarez Silva ◽  
Laura Calva Benítez ◽  
Pascal Conan ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Coastal Lagoons ◽  
Benthic Ecology ◽  
Terminos Lagoon

scholarly journals Utilization and Planning of Coastal Areas in Ordu

2018 ◽  
Vol 20 (1) ◽  
pp. 147-150
Keyword(s):  
Coastal Management ◽  
Coastal Area ◽  
Power Plants ◽  
Environmental Changes ◽  
Coastal Areas ◽  
The Black Sea ◽  
Black Sea Region ◽  
Coastal Cities ◽  
Short Period ◽  
Rapid Spread

Coastal management is generally means planning and application of environmental changes in the coastal area. The rapid spread of industrialization, urbanization, tourism and recreational activities are affecting the coastal cities in a much more negative way in Turkey, compared to other countries. Development in infrastructure to meet the needs of the population growing in coastal areas, provision of industrial and tourism facilities or power plants, placement of main roads in the coastal zone, separation of forest areas for secondary residences or workplaces are the most important factors leading to the deterioration of the identity of coastal cities. In this study, the changes of the coastal areas in Ordu Province, one of the important touristic cities of the Black Sea Region, have been examined and evaluated. Moreover, present shoreline was investigated within the framework of Turkish Coastal Law. Finally, the variation of coastal area was determined by using the ArcMap module of ArcGIS 10 programme as numerical. The results showed that the coastal area significantly increased by filling during a short period.

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