Wyniki wyszukiwania - BazTech

1

Potential use of mangroves as nature-based solutions to improve navigation conditions in a Port in southern Brazil

Previti L. S., Alfredini P.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

|

2023

|

Vol. 17 No. 3

507--513

EN

Mangroves and the associated shoal forest known as ‘restinga' are ecosystems of great ecological relevance that play a significant role in the protection of the coastline in tropical regions. In Brazil, the coastal region has been severely affected by urban expansion. The Paranaguá Port, located in Paraná State (Brazil), is the fourth most important Brazilian port in throughput, and is located in an estuarine region which features large mangrove forests. An historical assessment of its inner access channel dredging rates was made to assess the impacts that the expansion of the Port in the last 30 years may have caused to the ecosystem. In the following, the historical data concerning the dredged volume in the inner access channel was compared to the mangrove and the shoal forest associated variation, aiming to establish a potential correlation between vegetation and siltation in the inner access channel to show as the preservation or restoration of specific ecosystems has potential to Nature-Based Solutions.

2

Coastal and marine issues and their relation to ecosystem survey

Elentably A., Fisher K., Holger S., Alghanmi A., Alhrbi S.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

|

2022

|

Vol. 16 No. 3

449--454

EN

Protecting and preserving the environment and marine resources is a constant concern of countries. The seas and oceans face increasing threats to their flora and fauna from pollution, both from land and sea sources. Overexploitation of marine resources and overfishing pose serious threats to biodiversity and the balance of marine ecosystems. Especially for countries that rely on fisheries resources to feed their populations in closed or semi-closed seas. It is unusual to highlight overfishing by ships, as coastal states' resources do not allow for effective safety controls and as a result, there are a number of severely depleted fisheries worldwide. It is therefore vital that conservation and management measures for straddling fish stocks and highly migratory fish stocks continue and increase, as it is a resource that has transcended many national jurisdictions. According to the priorities of the current research project, which include alignment and adaptation to the regulations of the Saudi marine environment, the research group of the current marine ecosystem project tries to analyze the variables contained in maritime transport and shipping and to measure the impact of these variables on the marine ecosystem, by focusing on four national priority areas: 1) reliable and long-term seafood supply; 2) thriving coastal ecosystems; 3) sustainable coastal development; and 4) risk resilience in coastal communities. Prioritizing coastal issues and gathering desired outcomes from.

3

A Water Quality Evaluation of Integrated Mangrove Aquaculture System for Water Treatment in Super-Intensive White Leg Shrimp Pond

Mahmudi Mohammad, Musa Muhammad, Bunga Alamanda, Wati Nur Azlina, Arsad Sulastri, Lusiana Evellin Dewi

Journal of Ecological Engineering

|

2022

|

Vol. 23, nr 4

287--296

EN

White leg shrimp (Litopenaeus vannamei) is known as a prime aquacultural commodity in Indonesia. However, the rapid growth of shrimp farming has resulted in widespread destruction of coastal ecosystems, including mangrove swamps. Intensification of shrimp culture has led to many other environmental problems. Integration of mangroves into aquaculture systems (IMAS) should be considered as a way to preserve the mangrove ecosystem as well as sustainability of the aquaculture business by treating the influent and effluent water. This study aimed to assess the benefits of integrating mangroves into shrimp aquaculture, in terms of water quality. The results showed that temperature, dissolved oxygen (DO), and nitrite levels in the water significantly differed between sample sites. PCA analysis indicates that total organic matter (TOM), nitrates, nitrites, and ammonia were the principal factors in the overall water quality of the ponds. The highest pollution index was found in the super-intensive shrimp ponds ('moderately polluted'), while the other sites, including the mangrove area, were categorized as 'lightly polluted'. These findings suggest that the presence of mangroves may improve the quality of aquaculture wastewater, but the pollution index may still not reach the 'good' category. It is therefore recommended that a wastewater treatment plant be installed to support the integrated aquaculture system.

4

Correlation between Ecological Status of Sedati Waters and Gonadosomatic Index of Short-Necked Clam (Paratapes undulatus)

Fitriani Nurul, Cahyoko Yudi, Sulmartiwi Laksmi, Pursetyo Kustiawan Tri, Idris Mohd Hanafi, Zein Alfian, Masithah Endang Dewi

Ecological Engineering & Environmental Technology

|

2022

|

Vol. 23, iss. 5

198--204

EN

Catching is one way to get Short necked-clam so the demand also increases. The gonadosomatic index (GSI) of short necked-clam is a study to maintain the availability of short-necked-clam in waters. Another thing that can be obtained from this study is to know its relation to the ecological status (quality of water, substrate, and the abundance of plankton) in the waters of Sedati, Indonesia. The strategy utilized in deciding the choose point is based on the purposive inspecting strategy did some time recently with attempting to take samples at a few point within the range of brief necked-clam angling ground. To decide the relationship of the environmental status with GSI used regression, and correlation is further illustrated by descriptive statistical analysis. Based on the regression analysis, water quality has a relationship to the gonadosomatic index of short-necked clam either directly with a value of -0.1278 or through nutrients that are worth 0.6813. While the nutrient has a relationship to the gonadosomatic index of -0.99583 and substrate of 0.2525. The results showed ecological status that correlates most strongly is plankton abundance of 94.39% (very strong) but negative correlated, with dissolved oxygen of 83.92% (very strong) and with the temperature of 62,98% (strong).

5

Modeling the ecosystem response to summer coastal upwelling in the northern South China Sea

Jiang R., Wang Y.-S.

Oceanologia

|

2018

|

No. 60 (1)

32--51

EN

A coupled three-dimensional physical model and a nitrogen-based nutrient, phytoplankton, zooplankton, and detritus (NPZD) ecosystem model were applied to simulate the summer coastal upwelling system over the continental shelf of northern South China Sea (NSCS) and its impact on hydrographic conditions and ecosystem. The simulated results were comprehensively validated against field and satellite measurements. The model results show that the near shore ecosystem of NSCS has significant responses to the summer coastal upwelling system. The Shantou Coast to the Nanri Islands of Fujian province (YD) and the east of the Leizhou Peninsula (QD) are two main regions affected by NSCS summer coast upwelling. During summer, these two coastal areas are characterized by nearshore cold and high salinity upwelling current. Further, the summer coastal upwelling serves as a perfect nutrient pump, which lifts up and advects nutrient-rich current from deep to surface, from inner shelf to about 30 km outer shelf. This nutrient source reaches its maximum in the middle of July and then begins to decrease. However, the maximum phytoplankton and chlorophyll a do not coincide with the maximum nutrients and delay for about 10 days. Because of the intensive seasonal thermocline and the complicated current transporting through Qiongzhou strait, the ecological responding of QD is less pronounced than YD. This study has a better understanding of the physically modulated ecological responses to the NSCS summer coastal upwelling system.