Artykuły w czasopismach: „Intertidal wetlands”

1

Dai, Lingjun, Hongyu Liu i Yufeng Li. "Temporal and Spatial Changes in the Material Exchange Function of Coastal Intertidal Wetland—A Case Study of Yancheng Intertidal Wetland". International Journal of Environmental Research and Public Health 19, nr 15 (1.08.2022): 9419. http://dx.doi.org/10.3390/ijerph19159419.

Pełny tekst źródła

Streszczenie:

As a transition zone between the terrestrial ecosystem and the marine ecosystem, coastal intertidal wetland provides an important place for material circulation and energy exchange, and it is nature’s most precious resource. The ecological health of intertidal wetlands is an important prerequisite for sustainable green development. The material exchange function objectively and accurately reflects the material balance and ecological health of intertidal wetlands in the coastal zone. This paper uses remote sensing, geographic information technology, and model methods to objectively and accurately assess the temporal and spatial changes in the material exchange function of intertidal wetlands, providing a feasible method for studying the material exchange function of coastal wetlands. The material exchange capacity of wetlands in intertidal zones is affected by many factors, such as vegetation, topography, and base soil. After the invasion of the alien species Spartina alterniflora Lois., the elevation of the Suaeda salsa beach increased by 0.3 m. The elevation of the Phragmites australis beach rose by 0.14 m. The average elevation of S. alterniflora increased by 1.24 m. The material exchange capacity of the intertidal zone decreased by 25%. The functioning of the material exchange between sea and land changed significantly, and the area with a high level of material exchange function capacity was reduced by 71%.

Style APA, Harvard, Vancouver, ISO itp.

2

Gao, Yin, Lijuan Cui, Jianjun Liu, Wei Li i Yinru Lei. "China's coastal-wetland change analysis based on high-resolution remote sensing". Marine and Freshwater Research 71, nr 9 (2020): 1161. http://dx.doi.org/10.1071/mf19062.

Pełny tekst źródła

Streszczenie:

Coastal wetlands not only have abundant biodiversity and high productivity, but they also play an irreplaceable and important role in regional ecosystems. Because of the complex structure and dynamic characteristics of coastal wetlands, it is difficult to observe the spatial changes of coastal wetlands on a large scale and improve data reliability. In this study, a spatially constrained manual-interpretation method based on nationwide high-resolution images in 2017 was adopted to extract China’s coastal wetland distribution, and, then, the second national wetland-survey data from 2011 were used as a baseline for change analysis. The results showed that under the influence of natural conditions and human activities, China’s coastal wetlands have decreased in distribution in the past 6 years. The situation of coastal wetland reclamation is critical, and the hotspot regions are mainly distributed in Bohai Bay, middle of Jiangsu province and Hangzhou Bay. Farming reclamation is another factor that occupies coastal wetlands in China, and main occupied wetlands are mudflats, shallow sea, tidal flats, intertidal salt marshes and estuarine waters. Tide is the main factor affecting extraction of wetlands, the spatially constrained method had a positive effect on wetland detection, and has potential to improve automatic algorithms of complex coastal wetlands.

Style APA, Harvard, Vancouver, ISO itp.

3

Ross, Pauline, i Paul Adam. "Climate Change and Intertidal Wetlands". Biology 2, nr 1 (19.03.2013): 445–80. http://dx.doi.org/10.3390/biology2010445.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

4

Pang, Chun-chiu, Yik-Hei Sung, Yun-tak Chung, Hak-king Ying, Helen Hoi Ning Fong i Yat-tung Yu. "Spatial ecology of little egret (Egretta garzetta) in Hong Kong uncovers preference for commercial fishponds". PeerJ 8 (8.09.2020): e9893. http://dx.doi.org/10.7717/peerj.9893.

Pełny tekst źródła

Streszczenie:

Many natural wetlands have been converted to human-influenced wetlands. In some instances, human-influenced wetlands could provide complementary habitats for waterbirds, compensating for the loss of natural wetlands. Inner Deep Bay in Hong Kong is composed of both natural and human-influenced wetlands and is under immense development pressure. From an ecology perspective, we need to understand if different wetland types play the same ecological role. To achieve this, we tracked nine little egrets (Egretta garzetta) using GPS loggers for 14 months to study their spatial ecology, home range, movement and habitat use. We found that over 88% of the home range of all individuals comprised of wetlands (commercial fishponds, mangrove, gei wai, channel, and intertidal mudflat). Among these wetland types, nearly all (seven of nine) individuals preferred commercial fishponds over other habitats in all seasons. Little egrets exhibited seasonal movement and habitat use among seasons, with largest home range, greatest movement, and most frequent visits to commercial fishponds in winter compared to spring and autumn. Our results highlight the significant role of commercial fishponds, providing a feeding ground for little egrets. However, other wetland types cannot be ignored, as they were also used considerably. These findings underscore the importance of maintaining a diversity of wetland types as alternative foraging and breeding habitats.

Style APA, Harvard, Vancouver, ISO itp.

5

Smolders, S., Y. Plancke, S. Ides, P. Meire i S. Temmerman. "Role of intertidal wetlands for tidal and storm tide attenuation along a confined estuary: a model study". Natural Hazards and Earth System Sciences 15, nr 7 (30.07.2015): 1659–75. http://dx.doi.org/10.5194/nhess-15-1659-2015.

Pełny tekst źródła

Streszczenie:

Abstract. Coastal lowlands and estuaries are subjected to increasing flood risks during storm surges due to global and regional changes. Tidal wetlands are increasingly valued as effective natural buffers for storm surges by dissipating wave energy and providing flood water storage. While previous studies focused on flood wave attenuation within and behind wetlands, this study focuses on the effects of estuarine wetland properties on the attenuation of a storm tide that propagates along the length of an estuary. Wetland properties including elevation, surface area, and location within the estuary were investigated using a numerical model of the Scheldt estuary (Belgium, SW Netherlands). For a spring tide lower wetland elevations result in more attenuation of high water levels along the estuary, while for a higher storm tide higher elevations provide more attenuation compared to lower wetland elevations. For spring and storm tide a larger wetland surface area results in a better attenuation along the estuary up to a threshold wetland size for which larger wetlands do not further contribute to more attenuation. Finally a wetland of the same size and elevation, but located more upstream in the estuary, can store a larger proportion of the local flood volume and therefore has a larger attenuating effect on upstream high water levels. With this paper we aim to contribute towards a better understanding and wider implementation of ecosystem-based adaptation to increasing estuarine flood risks associated with storms.

Style APA, Harvard, Vancouver, ISO itp.

6

Smolders, S., Y. Plancke, S. Ides, P. Meire i S. Temmerman. "Role of intertidal wetlands for tidal and storm tide attenuation along a confined estuary: a model study". Natural Hazards and Earth System Sciences Discussions 3, nr 5 (8.05.2015): 3181–224. http://dx.doi.org/10.5194/nhessd-3-3181-2015.

Pełny tekst źródła

Streszczenie:

Abstract. Coastal lowlands and estuaries are subjected to increasing flood risks during storm surges due to global and regional changes. Tidal wetlands are increasingly valued as effective natural buffers for storm surges by dissipating wave energy and providing flood water storage. While previous studies focused on flood wave attenuation within and behind wetlands, this study focuses on the effects of estuarine wetland properties on the attenuation of a storm tide that propagates along the length of an estuary. Wetland properties including elevation, surface area, and location within the estuary were investigated using a numerical model of the Scheldt estuary (Belgium, SW Netherlands). For a spring tide lower wetland elevations result in more attenuation of high water levels along the estuary, while for a higher storm tide higher elevations provide more attenuation compared to lower wetland elevations. For spring and storm tide a arger wetland surface area results in a better attenuation along the estuary up to a threshold wetland size for which larger wetlands do not further contribute to more attenuation. Finally a wetland of the same size and elevation, but located more upstream in the estuary, can store a larger proportion of the local flood volume and therefore has a larger attenuating effect on upstream high water levels. With this paper we aim to contribute towards a better understanding and wider implementation of ecosystem-based adaptation to increasing estuarine flood risks associated with storms.

Style APA, Harvard, Vancouver, ISO itp.

7

Murray, Nicholas J., Thomas A. Worthington, Pete Bunting, Stephanie Duce, Valerie Hagger, Catherine E. Lovelock, Richard Lucas i in. "High-resolution mapping of losses and gains of Earth’s tidal wetlands". Science 376, nr 6594 (13.05.2022): 744–49. http://dx.doi.org/10.1126/science.abm9583.

Pełny tekst źródła

Streszczenie:

Tidal wetlands are expected to respond dynamically to global environmental change, but the extent to which wetland losses have been offset by gains remains poorly understood. We developed a global analysis of satellite data to simultaneously monitor change in three highly interconnected intertidal ecosystem types—tidal flats, tidal marshes, and mangroves—from 1999 to 2019. Globally, 13,700 square kilometers of tidal wetlands have been lost, but these have been substantially offset by gains of 9700 km 2 , leading to a net change of −4000 km 2 over two decades. We found that 27% of these losses and gains were associated with direct human activities such as conversion to agriculture and restoration of lost wetlands. All other changes were attributed to indirect drivers, including the effects of coastal processes and climate change.

Style APA, Harvard, Vancouver, ISO itp.

8

Mazumder, Debashish, Neil Saintilan, Robert J. Williams i Ron Szymczak. "Trophic importance of a temperate intertidal wetland to resident and itinerant taxa: evidence from multiple stable isotope analyses". Marine and Freshwater Research 62, nr 1 (2011): 11. http://dx.doi.org/10.1071/mf10076.

Pełny tekst źródła

Streszczenie:

Juveniles of commercially important fish species congregate in shallow vegetated estuarine habitats during high tides. Considerable debate has centred on whether the significance of these habitats lies in their provision of greater feeding opportunities, or shelter from predation afforded by greater structural complexity. We tested the hypothesis that an inundated mangrove and saltmarsh wetland provided feeding opportunities for itinerant species, and that the contribution of wetland primary producers and grazing herbivores could be identified in their diet, using stable isotopes of carbon and nitrogen. Potential sources of dietary carbon included mangrove, saltmarsh, seagrass, seagrass epiphytic material and benthic organic material. Saltmarsh plants (mostly Sporobolus virginicus and Juncus kraussii) and fine benthic organic material appeared to be the primary sources of dietary carbon for the resident grazing herbivores in the wetlands, based on IsoSource mixing models. During high tide, species of itinerant fish enter the mangrove and, when inundated, the saltmarsh, and feed primarily on crab larvae and copepods. Fine benthic organic matter, seagrass epiphyte, and C3 and C4 plant materials also supplement the diet of some fish. The crab larvae therefore provide a significant source of nutrition and an important link between the intertidal wetlands and the adjacent estuarine ecosystem. The carnivorous fish Acanthopagrus australis, at the highest trophic level, hunted within or adjacent to the mangrove–saltmarsh wetland and fed on several lower-order consumers within the wetland. The present study highlights the significance of mangrove and saltmarsh wetlands as a feeding habitat for resident grazers and itinerant nekton.

Style APA, Harvard, Vancouver, ISO itp.

9

Yong, Ding Li, Jing Ying Kee, Pyae Phyo Aung, Anuj Jain, Chin-Aik Yeap, Nyat Jun Au, Ayuwat Jearwattanakanok i in. "Conserving migratory waterbirds and the coastal zone: the future of South-east Asia's intertidal wetlands". Oryx 56, nr 2 (21.10.2021): 176–83. http://dx.doi.org/10.1017/s0030605320001374.

Pełny tekst źródła

Streszczenie:

AbstractSouth-east Asia's diverse coastal wetlands, which span natural mudflats and mangroves to man-made salt pans, offer critical habitat for many migratory waterbird species in the East Asian–Australasian Flyway. Species dependent on these wetlands include nearly the entire population of the Critically Endangered spoon-billed sandpiper Calidris pygmaea and the Endangered spotted greenshank Tringa guttifer, and significant populations of several other globally threatened and declining species. Presently, more than 50 coastal Important Bird and Biodiversity Areas (IBAs) in the region (7.4% of all South-east Asian IBAs) support at least one threatened migratory species. However, recent studies continue to reveal major knowledge gaps on the distribution of migratory waterbirds and important wetland sites along South-east Asia's vast coastline, including undiscovered and potential IBAs. Alongside this, there are critical gaps in the representation of coastal wetlands across the protected area networks of many countries in this region (e.g. Viet Nam, Indonesia, Malaysia), hindering effective conservation. Although a better understanding of the value of coastal wetlands to people and their importance to migratory species is necessary, governments and other stakeholders need to do more to strengthen the conservation of these ecosystems by improving protected area coverage, habitat restoration, and coastal governance and management. This must be underpinned by the judicious use of evidence-based approaches, including satellite-tracking of migratory birds, ecological research and ground surveys.

Style APA, Harvard, Vancouver, ISO itp.

10

Glenn, Edward P. "Wetlands of the Colorado River Delta Maintained by Agricultural Drainage Water". HortScience 31, nr 4 (sierpień 1996): 690b—690. http://dx.doi.org/10.21273/hortsci.31.4.690b.

Pełny tekst źródła

Streszczenie:

The delta of the Colorado River in Mexico historically contained 780,000 ha of riparian, marsh, and gallery forest habitat. Similar to other desert river deltas, such as the Nile and Indus, the lower delta of the Colorado River has been severely affected by the upstream diversion of water for human use. However, several large marsh areas of conservation interest still occur below the agricultural fields in Mexico. They are supported by flood water, agricultural drainage water, and municipal sewage effluent, as well as by seawater in the intertidal zone. The main anthropogenic marshes are the Rio Hardy wetland, maintained by geothermal discharge and Mexicali irrigation return flows in the western delta, and Cienega de Santa Clara, maintained by local irrigation return flows and by discharge of Wellton-Mohowk Valley drainage from the United States, imported via a 80-km canal to Mexico. These wetlands provide valuable habitat to resident and migratory waterfowl, shorebirds, mammals, and endangered species, including the Yuma Clapper Rail and the Desert Pupfish. Both wetlands are currently threatened by water management actions that do not take the wetland value of agricultural drainage into consideration. If agricultural drainage water and other available waste streams were explicitly managed to support wetlands, the Colorado River detla could potentially contain 50,000 ha or more of permanent, high-quality brackish wetlands below the agricultural fields.

Style APA, Harvard, Vancouver, ISO itp.

11

Mahoney, Richard D., Jeffrey L. Beal, Dakota M. Lewis i Geoffrey S. Cook. "Quantifying the Response of an Estuarine Nekton Community to Coastal Wetland Habitat Restoration". Sustainability 13, nr 23 (1.12.2021): 13299. http://dx.doi.org/10.3390/su132313299.

Pełny tekst źródła

Streszczenie:

Globally coastal habitats are experiencing degradation and threatening the production of critical ecosystem services such as shoreline stabilization, water filtration, and nursery grounds for marine fauna. To combat the loss of these ecosystem services, resource managers are actively restoring coastal habitats. This study compares samples collected from non-restored sites, sites restored in 2011, and sites that underwent restoration in 2019. Restoration sites are impacted wetlands with high elevation mounds that were leveled to increase the areal extent of intertidal habitats, enabling the recruitment of intertidal flora and fauna. Fyke nets were used to sample nekton within the upper intertidal zone. To quantify restoration success, nekton abundance, biomass, diversity, and indicator species were quantified. Sites restored in 2011 had a greater abundance compared to non-restored sites. Common snook, clown gobies, silversides, juvenile mullet, and Gulf killifishes were indicator species at successfully restored sites, while salinity, site type, and Secchi depth played important roles in predicting abundance and diversity. These findings are consistent with recent studies suggesting it can take years to see quantifiable differences in nekton communities following habitat restoration. Additionally, this work provides new insight regarding the benefits of restoring coastal wetland elevation to maximize intertidal habitat, thereby positively impacting nekton communities.

Style APA, Harvard, Vancouver, ISO itp.

12

Duke, Norman C., Colin Field, Jock R. Mackenzie, Jan-Olaf Meynecke i Apanie L. Wood. "Rainfall and its possible hysteresis effect on the proportional cover of tropical tidal-wetland mangroves and saltmarsh–saltpans". Marine and Freshwater Research 70, nr 8 (2019): 1047. http://dx.doi.org/10.1071/mf18321.

Pełny tekst źródła

Streszczenie:

Mangrove–saltmarsh tidal wetlands are highly dynamic ecosystems, responding and adapting to climate and physical conditions at all spatial and temporal scales. Knowledge of the large-scale ecosystem processes involved and how they might be influenced by climate variables is highly relevant today. For tidal-wetland sites well within the latitudinal range of the mostly tropical mangrove communities, we confirm that average annual rainfall influences vegetative cover, as well as species composition and biomass of tidal wetlands. On the basis of 205 largely unmodified, tropical and subtropical estuaries of northern Australia, a sigmoidal relationship, with a centroid inflection point ~1368mm, was derived between rainfall and the relative amounts of high-biomass mangroves and low-biomass saltmarsh–saltpan vegetation. The presence and probability of observed combinations of these community types were quantified using the wetland cover index, which is the ratio of total mangrove area to that of mangroves plus intertidal saltmarsh and saltpans. Accordingly, periodic changes in rainfall trends are likely manifest as either encroachment or dieback of mangroves along the ecotones separating them from tidal saltmarsh–saltpans. Presented is a new conceptual framework and model that describes how such ecosystem-scale processes take place in tropical and subtropical tidal wetlands.

Style APA, Harvard, Vancouver, ISO itp.

13

Li, Zhi, i Ben R. Hodges. "Revisiting Surface-Subsurface Exchange at Intertidal Zone with a Coupled 2D Hydrodynamic and 3D Variably-Saturated Groundwater Model". Water 13, nr 7 (26.03.2021): 902. http://dx.doi.org/10.3390/w13070902.

Pełny tekst źródła

Streszczenie:

A new high-performance numerical model (Frehg) is developed to simulate water flow in shallow coastal wetlands. Frehg solves the 2D depth-integrated, hydrostatic, Navier–Stokes equations (i.e., shallow-water equations) in the surface domain and the 3D variably-saturated Richards equation in the subsurface domain. The two domains are asynchronously coupled to model surface-subsurface exchange. The Frehg model is applied to evaluate model sensitivity to a variety of simplifications that are commonly adopted for shallow wetland models, especially the use of the diffusive wave approximation in place of the traditional Saint-Venant equations for surface flow. The results suggest that a dynamic model for momentum is preferred over diffusive wave model for shallow coastal wetlands and marshes because the latter fails to capture flow unsteadiness. Under the combined effects of evaporation and wetting/drying, using diffusive wave model leads to discrepancies in modeled surface-subsurface exchange flux in the intertidal zone where strong exchange processes occur. It indicates shallow wetland models should be built with (i) dynamic surface flow equations that capture the timing of inundation, (ii) complex topographic features that render accurate spatial extent of inundation, and (iii) variably-saturated subsurface flow solver that is capable of modeling moisture change in the subsurface due to evaporation and infiltration.

Style APA, Harvard, Vancouver, ISO itp.

14

Chen, Xu, Mingliang Zhang i Hengzhi Jiang. "Morphological Characteristics and Hydrological Connectivity Evaluation of Tidal Creeks in Coastal Wetlands". Land 11, nr 10 (1.10.2022): 1707. http://dx.doi.org/10.3390/land11101707.

Pełny tekst źródła

Streszczenie:

Tidal creeks play a critical role in delivering water, suspended sediments, and nutrients to coastal wetlands, so it is important to understand the characteristics of the tidal creek system to guide the development and sustainable utilization of coastal wetlands. Using the coastal wetlands of the Liao River Estuary (LRE) as a study area, this study accurately divided the tidal flat based on the principle of tidal correction, extracted the linear features of tidal creeks using high-resolution remote sensing (RS) data, and then classified the tidal creeks on a tidal flat using the tidal creek ordering algorithm. Our study aimed to quantify the morphological characteristics of tidal creeks and qualitatively evaluate the parameters of the tidal creek network in the study area. The study results show obvious spatial heterogeneity in the order and the average length of tidal creeks in the coastal wetlands of the LRE. With the increase in the order of tidal creeks, the average length of tidal creeks increased exponentially and the number of tidal creeks decreased exponentially in the study area. The total density of tidal creeks was related to the beach surface elevation gradient, and the density and frequency of tidal creeks reduced substantially with an increase in the order of tidal creeks. The sinuosity ratio of tidal creeks declined sharply with a fall in the beach surface elevation gradient. The average bifurcation ratio of tidal creeks in the upper intertidal zone was higher than that in other zones, indicating that the tidal creeks in the upper intertidal zone were erratic. In addition, the hydrological connectivity of the tidal creek network in the upper intertidal zone and the development of the tidal creek system in the supratidal zone were the highest in the LRE. The study results help understand the spatial variations in tidal creek morphology under the influence of tidal hydrodynamics.

Style APA, Harvard, Vancouver, ISO itp.

15

Jennings, Scott, David Lumpkin, Nils Warnock, T. Emiko Condeso i John P. Kelly. "Great egret (Ardea alba) habitat selection and foraging behavior in a temperate estuary: Comparing natural wetlands to areas with shellfish aquaculture". PLOS ONE 16, nr 12 (31.12.2021): e0261963. http://dx.doi.org/10.1371/journal.pone.0261963.

Pełny tekst źródła

Streszczenie:

Movement by animals to obtain resources and avoid predation often depends on natural cycles, and human alteration of the landscape may disrupt or enhance the utility of different habitats or resources to animals through the phases of these cycles. We studied habitat selection by GPS/accelerometer-tagged great egrets (Ardea alba) foraging in areas with shellfish aquaculture infrastructure and adjacent natural wetlands, while accounting for tide-based changes in water depth. We used integrated step selection analysis to test the prediction that egrets would express stronger selection for natural wetlands (eelgrass, tidal marsh, and other tidal wetlands) than for shellfish aquaculture areas. We also evaluated differences in foraging behavior among shellfish aquaculture areas and natural wetlands by comparing speed travelled (estimated from distance between GPS locations) and energy expended (Overall Dynamic Body Acceleration) while foraging. We found evidence for stronger overall habitat selection for eelgrass than for shellfish aquaculture areas, with results conditional on water depth: egrets used shellfish aquaculture areas, but only within a much narrower range of water depths than they used eelgrass and other natural wetlands. We found only slight differences in our metrics of foraging behavior among shellfish aquaculture areas and natural wetlands. Our results suggest that although great egrets appear to perceive or experience shellfish aquaculture areas as suitable foraging habitat during some conditions, those areas provide less foraging opportunity throughout tidal cycles than natural wetlands. Thus, expanding the footprint of shellfish aquaculture into additional intertidal areas may reduce foraging opportunities for great egrets across the range of tidal cycles. Over longer time scales, the ways in which natural wetlands and shellfish aquaculture areas adapt to rising sea levels (either through passive processes or active management) may change the ratios of these wetland types and consequently change the overall value of Tomales Bay to foraging great egrets.

Style APA, Harvard, Vancouver, ISO itp.

16

Ding, Qiong, Wu Chen, Bruce Anthony King, Yongqi Chen, Yanxiong Liu i Hande Zhang. "Coastal Wetland Investigations by Airborne LiDAR: A Case Study in the Yellow River Delta, China". Marine Technology Society Journal 45, nr 5 (1.09.2011): 59–70. http://dx.doi.org/10.4031/mtsj.45.5.6.

Pełny tekst źródła

Streszczenie:

AbstractCoastal wetlands are considered the most biologically diverse of all ecosystems. Understanding their structures and functions is important for coastal environmental management and development. Airborne LiDAR (Light Detection and Ranging) has emerged as an effective tool for creating high-resolution digital surface models (DSM, highest elevation points) and digital terrain models (DTM, ground only points), which are vital geographic information sources for various applications in coastal areas, and investigating spatial patterns of vegetation in areas that are difficult to access. This paper investigates LiDAR’s capability for mapping marine wetlands, extracting vegetation and channel networks, and identifying intertidal zones. The Yellow River Delta, China, was selected as a study site to conduct experiments. With only a 4.5-h flight, an area of more than 670 km2 was surveyed with great detail. High-resolution DSMs and DTMs were generated, the vegetation coverage and heights were extracted using methods based on height and multi-return and the results were compared, and the water and tidal channels, which reflect the complete water transport system in the area, were mapped and measured. By combining LiDAR data and local tidal observations, the intertidal zone, which is a significant part of coastal wetlands, is clearly identified.

Style APA, Harvard, Vancouver, ISO itp.

17

Zhang, Mingliang, Tianping Xu i Hengzhi Jiang. "The impacts of runoff decrease and shoreline change on the salinity distribution in the wetlands of Liao River estuary, China". Ocean Science 17, nr 1 (27.01.2021): 187–201. http://dx.doi.org/10.5194/os-17-187-2021.

Pełny tekst źródła

Streszczenie:

Abstract. The wetland of Liao River estuary (LRE) in northeastern China is one of the best-preserved wetlands across the globe. However, it is extremely vulnerable to hydrological changes as well as other disturbances, particularly upstream river discharges and the reclamation from anthropogenic activities. In this study, a 3D hydrodynamic model was used to reproduce the flow patterns of the LRE and to explore the variation in salinity under different scenarios. Furthermore, the impact of river discharge and shoreline changes on the salinity distribution in the LRE was quantitatively analyzed and discussed through several simulation experiments. The model reasonably reconstructed the spatiotemporal variability and distribution of salinity in the Liao River estuary and the wetlands across intertidal areas. Increases in runoff were demonstrated to significantly decrease the mean salinity values of the estuary, with changes in salinity negatively correlated to the longitudinal distance from the estuary mouth. Moreover, the shoreline change caused by the construction of Panjin Port was observed to have an obvious influence on the salinity distribution of the LRE, particularly in the lower reaches of the Pink Beach wetland. Comparisons of the Liao River estuary residual flow fields under different shorelines revealed that the establishment of the port resulted in the diffusion of the runoff from the Daliao River due to the obstruction of the port body, which enhanced the tidal mixing effect and consequently weakened the dilution effect of freshwater entering the Pink Beach wetland. Overall, the current study should be helpful for offering a greater understanding of Suaeda heteroptera vegetation degradation in the LRE, China, and also provides a new perspective in investigating the degradation mechanism in other estuarine wetlands.

Style APA, Harvard, Vancouver, ISO itp.

18

Fan, Yaoshen, Shoubing Yu, Jinghao Wang, Peng Li, Shenliang Chen, Hongyu Ji, Ping Li i Shentang Dou. "Changes of Inundation Frequency in the Yellow River Delta and Its Response to Wetland Vegetation". Land 11, nr 10 (23.09.2022): 1647. http://dx.doi.org/10.3390/land11101647.

Pełny tekst źródła

Streszczenie:

The spatiotemporal changes of inundation frequency in the Yellow River Delta (YRD) have profound influences on sustainable ecological protection and are also closely relevant to economic development scarcity on the coast of China. However, long-term changes of inundation frequency have remained poorly characterized. Using the Google Earth Engine (GEE) cloud platform, this study processed Landsat images to explore inundation frequency changes from 1990 to 2020 in the YRD. The results indicated that (1) The existing water index combining the classification results based on the MLM (Maximum Likelihood Method) is suitable for the mapping of the long-term water bodies, especially in the coastal regions; (2) The inundation frequency showed a clearly uneven temporal–spatial distribution. The low inundation area (LIA) is mainly intertidal natural wetlands with a declining trend, while the high inundation area (HIA) is dominated by constructed wetlands with a rising trend; (3) The use frequency of artificial ponds determines the inundation frequency of the constructed wetland. The industry development has gradually matured, causing the inundation frequency from dispersion to concentration in the constructed wetland; and (4) In the natural wetland, the LIA have increased since 2010 and have accounted for 30% in 2020. The large-scale appearance of LIA occurs with the emergence of high vegetation abundance. Spartina alterniflora salt marshes with strong reproductive ability and high abundance lead to the difficulty of wetland flooding and reduce the inundation frequency.

Style APA, Harvard, Vancouver, ISO itp.

19

Balke, Thorsten, Alejandra Vovides, Christian Schwarz, Gail L. Chmura, Cai Ladd i Mohammad Basyuni. "Monitoring tidal hydrology in coastal wetlands with the “Mini Buoy”: applications for mangrove restoration". Hydrology and Earth System Sciences 25, nr 3 (11.03.2021): 1229–44. http://dx.doi.org/10.5194/hess-25-1229-2021.

Pełny tekst źródła

Streszczenie:

Abstract. Acquiring in situ data of tidal flooding is key for the successful restoration planning of intertidal wetlands such as salt marshes and mangroves. However, monitoring spatially explicit inundation time series and tidal currents can be costly and technically challenging. With the increasing availability of low-cost sensors and data loggers, customized solutions can now be designed to monitor intertidal hydrodynamics with direct applications for restoration and management. In this study, we present the design, calibration, and application of the “Mini Buoy”, a low-cost underwater float containing an acceleration data logger for monitoring tidal inundation characteristics and current velocities derived from single-axis equilibrium acceleration (i.e. logger tilt). The acceleration output of the Mini Buoys was calibrated against water-level and current-velocity data in the hypertidal Bay of Fundy, Canada, and in a tidally reconnected former aquaculture pond complex in North Sumatra, Indonesia. Key parameters, such as submersion time and current velocities during submergence, can be determined over several months using the Mini Buoy. An open-source application was developed to generate ecologically meaningful hydrological information from the Mini Buoy data for mangrove restoration planning. We present this specific SE Asian mangrove restoration application alongside a flexible concept design for the Mini Buoy to be customized for research and management of intertidal wetlands worldwide.

Style APA, Harvard, Vancouver, ISO itp.

20

Adame, Maria Fernanda, Ruth Reef, Alistair Grinham, Glen Holmes i Catherine E. Lovelock. "Nutrient exchange of extensive cyanobacterial mats in an arid subtropical wetland". Marine and Freshwater Research 63, nr 5 (2012): 457. http://dx.doi.org/10.1071/mf11133.

Pełny tekst źródła

Streszczenie:

Cyanobacterial mats cover extensive areas of subtropical arid coastal wetlands and are sites of active nutrient exchange. To assess spatial (low v. high in the intertidal zone) and temporal (day v. night) variability in nitrogen (N) exchange in arid Exmouth Gulf, Western Australia, we measured nutrient exchange (NOx–-N, NH4+ and soluble reactive phosphorus) during tidal inundation and N fixation of cyanobacterial mats before and during an unusual period of heavy rainfall. Additionally, we investigated the species composition within the cyanobacterial mat. We hypothesised that nutrients are released to the floodwater during tidal inundation, that N fixation is a significant path of N incorporation, that highest N fixation rates occur in the low intertidal zone at night, and that the cyanobacterial mat community composition varies across the intertidal zone. Our results showed that nutrients were removed from the floodwater during tidal inundation. N fixation accounted for 34% of N incorporation, with highest rates in the lower intertidal zone during the day. The cyanobacterial mat was dominated by Microcoleus chthonoplastes, but composition varied across the intertidal zone. The present study provided evidence of temporal and spatial variability in nutrient exchange and implied an important role of cyanobacterial mats in coastal production.

Style APA, Harvard, Vancouver, ISO itp.

21

Jin, Xinwei, Jingjing Fu, Juan Yang, Jing Guo, Wenrui Guo i Yahui Chen. "Effect of Mangrove on Nitrogen Removal in the Intertidal Zone of Shenzhen’s Deep Bay: From 15N Isotope Tracing to Microbial Analysis". Water 14, nr 21 (2.11.2022): 3507. http://dx.doi.org/10.3390/w14213507.

Pełny tekst źródła

Streszczenie:

This study focuses on the nitrogen removal capability of the mangrove wetland system towards resolving the excessive inorganic nitrogen content in the marine water of Shenzhen’s Deep Bay. The nitrogen distribution characteristics, biological nitrogen removal processes, nitrogen removal functional genes, and bacterial community characteristics were investigated in five wetland sites in the intertidal zone of the Deep Bay, viz. the Kandelia candel, Bruguiera gymnorrhiza, Sonneratia apetala, Aegiceras corniculatum, and mud flat sites. The results showed that ammonia and nitrate in the marine water were significantly removed in the five wetlands sites, with respective removal efficiencies of 70.9–75.5% and 89.5–94.0%. The concentration of ammonia and nitrate in pore water remained significantly unchanged with depth. Denitrification and anammox were each system’s main biological nitrogen removal processes, and their rates were 1.70–3.22 and 0.07–0.36 μmol/(kg·h), respectively. The denitrification rates in the mangroves were higher than in the mud flat site, unlike the anammox rates. The denitrifying functional genes (nirS, nosZ) and anammox functional gene (hzsB) showed an excellent linear relationship with the relevant process rates. Bacillus and Pseudomonas were the main heterotrophic denitrifying bacteria genera identified. The autotrophic denitrifying bacteria genus Sulfurovum was also identified in the systems, while Candidatus Scalindua was the only anammox genus identified in this study. The results of this study improve our understanding of the nitrogen removal characteristics of coastal wetlands and the role of mangrove plants in the biological nitrogen removal processes.

Style APA, Harvard, Vancouver, ISO itp.

22

Lv, Ruiyuan, Dini Wu, Jiewei Ding, Xunchao Yuan, Guoying Zhou, Yujia Zhang, Qiang Kong i in. "Long-term performance and microbial mechanism in intertidal wetland sediment introduced constructed wetlands treating saline wastewater". Journal of Cleaner Production 310 (sierpień 2021): 127409. http://dx.doi.org/10.1016/j.jclepro.2021.127409.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

23

Horstman, Erik, Thorsten Balke, Tjeerd Bouma, Marjolein Dohmen-Janssen i Suzanne Hulscher. "OPTIMIZING METHODS TO MEASURE HYDRODYNAMICS IN COASTAL WETLANDS: EVALUATING THE USE AND POSITIONING OF ADV, ADCP AND HR-ADCP". Coastal Engineering Proceedings 1, nr 32 (31.01.2011): 51. http://dx.doi.org/10.9753/icce.v32.waves.51.

Pełny tekst źródła

Streszczenie:

Hydrodynamic impacts of vegetation in the intertidal zone are highly important to coastal protection. However, most studies on hydrodynamic impacts of vegetation in the intertidal zone are carried out in flumes. This results in a lack of field data for validating models that describe short-term hydrodynamic impacts of vegetation. The current research focuses on field measurements of flow patterns and waves in vegetated intertidal areas. Ample measurement devices are available to measure hydrodynamic processes in the field. Examples are: acoustic Doppler current profilers (ADCP), high resolution acoustic Doppler current profilers (HR-ADCP) and acoustic Doppler velocity meters (ADV). This study focuses on the differences in the performance of these devices, to determine which of them can be best deployed in a future fieldwork campaign in mangroves. Major points of attention in this comparison are the accuracy of the data and the potential disturbance of the measurements by the presence of vegetation. It is concluded that ADV’s perform very well in vegetated intertidal areas, while (HR-)ADCP’s show difficulties when deployed upward looking. Furthermore, ADV’s are preferred over (HR-)ADCP’s due to their ability of combining high frequent wave and current measurements and their convenient deployment.

Style APA, Harvard, Vancouver, ISO itp.

24

O'Sullivan, Aidan. "Eire Intertidal archaeological surveys in the estuarine wetlands of North Munster". International Journal of Nautical Archaeology 24, nr 1 (luty 1995): 71–73. http://dx.doi.org/10.1111/j.1095-9270.1995.tb00715.x.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

25

Lichacz, W., S. Hardiman i R. T. Buckney. "Below-ground biomass in some intertidal wetlands in New South Wales." Wetlands Australia 4, nr 2 (13.10.2009): 56. http://dx.doi.org/10.31646/wa.84.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

26

MAREE, BRONWYN. "Structure and status of the intertidal wetlands of the Knysna Estuary". Transactions of the Royal Society of South Africa 55, nr 2 (styczeń 2000): 163–76. http://dx.doi.org/10.1080/00359190009520441.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

27

Clint Slatton, K., Melba M. Crawford i Li-Der Chang. "Modeling temporal variations in multipolarized radar scattering from intertidal coastal wetlands". ISPRS Journal of Photogrammetry and Remote Sensing 63, nr 5 (wrzesień 2008): 559–77. http://dx.doi.org/10.1016/j.isprsjprs.2008.07.003.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

28

Zawislanski, P. T., H. S. Mountford, E. J. Gabet, A. E. McGrath i H. C. Wong. "Selenium Distribution and Fluxes in Intertidal Wetlands, San Francisco Bay, California". Journal of Environmental Quality 30, nr 3 (maj 2001): 1080–91. http://dx.doi.org/10.2134/jeq2001.3031080x.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

29

Wang, Qian, Zhenfeng Cao, Qian Liu, Jinyong Zhang, Yanbiao Hu, Ji Zhang, Wei Xu, Qiang Kong, Xunchao Yuan i QingFeng Chen. "Enhancement of COD removal in constructed wetlands treating saline wastewater: Intertidal wetland sediment as a novel inoculation". Journal of Environmental Management 249 (listopad 2019): 109398. http://dx.doi.org/10.1016/j.jenvman.2019.109398.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

30

Hamman, Evan. "Addressing Coastal Wetland Decline in China’s Yellow Sea". Chinese Journal of Environmental Law 2, nr 2 (19.11.2018): 165–94. http://dx.doi.org/10.1163/24686042-12340031.

Pełny tekst źródła

Streszczenie:

AbstractThis article provides an analysis of the environmental challenges presented by coastal development on the Chinese coast of the Yellow Sea, and, in particular, its effect on migratory shorebirds. It reflects on the rate of coastal development in China and its impact on intertidal wetlands, including what is being done, from a legal perspective, to address the declines. Existing regulatory measures are examined and it is argued that strategic environmental assessment needs to be given greater attention by the Chinese authorities. In addition, principles of conservation such as participatory management need to be fully embraced to empower local communities to restore degraded sites, monitor birdlife, and, where necessary, challenge inappropriate development activities through the courts. These initiatives, coupled with the eventual enactment of a new national wetland law in China, should strengthen the response to the threats and help arrest some of the declines in shorebird populations.

Style APA, Harvard, Vancouver, ISO itp.

31

Varnell, L. "A geomorphological model of intertidal cove marshes with application to wetlands management". Ecological Engineering 19, nr 5 (luty 2003): 339–47. http://dx.doi.org/10.1016/s0925-8574(02)00120-9.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

32

Yun, Juanli, Yongcui Deng i Hongxun Zhang. "Anthropogenic protection alters the microbiome in intertidal mangrove wetlands in Hainan Island". Applied Microbiology and Biotechnology 101, nr 15 (30.05.2017): 6241–52. http://dx.doi.org/10.1007/s00253-017-8342-1.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

33

Liu, Cheng, Lijun Hou, Min Liu, Yanling Zheng, Guoyu Yin, Hongpo Dong, Xia Liang, Xiaofei Li, Dengzhou Gao i Zongxiao Zhang. "In situ nitrogen removal processes in intertidal wetlands of the Yangtze Estuary". Journal of Environmental Sciences 93 (lipiec 2020): 91–97. http://dx.doi.org/10.1016/j.jes.2020.03.005.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

34

Healy, Michael G., i Kieran R. Hickey. "Historic land reclamation in the intertidal wetlands of the Shannon estuary, western Ireland". Journal of Coastal Research 36 (marzec 2002): 365–73. http://dx.doi.org/10.2112/1551-5036-36.sp1.365.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

35

DALE, P. E. R., A. L. CHANDICA i M. EVANS. "Using image subtraction and classification to evaluate change in sub-tropical intertidal wetlands". International Journal of Remote Sensing 17, nr 4 (marzec 1996): 703–19. http://dx.doi.org/10.1080/01431169608949039.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

36

Dang, Kinh Bac, Manh Ha Nguyen, Duc Anh Nguyen, Thi Thanh Hai Phan, Tuan Linh Giang, Hoang Hai Pham, Thu Nhung Nguyen, Thi Thuy Van Tran i Dieu Tien Bui. "Coastal Wetland Classification with Deep U-Net Convolutional Networks and Sentinel-2 Imagery: A Case Study at the Tien Yen Estuary of Vietnam". Remote Sensing 12, nr 19 (8.10.2020): 3270. http://dx.doi.org/10.3390/rs12193270.

Pełny tekst źródła

Streszczenie:

The natural wetland areas in Vietnam, which are transition areas from inland and ocean, play a crucial role in minimizing coastal hazards; however, during the last two decades, about 64% of these areas have been converted from the natural wetland to the human-made wetland. It is anticipated that the conversion rate continues to increase due to economic development and urbanization. Therefore, monitoring and assessment of the wetland are essential for the coastal vulnerability assessment and geo-ecosystem management. The aim of this study is to propose and verify a new deep learning approach to interpret 9 of 19 coastal wetland types classified in the RAMSAR and MONRE systems for the Tien Yen estuary of Vietnam. Herein, a Resnet framework was integrated into the U-Net to optimize the performance of the proposed deep learning model. The Sentinel-2, ALOS-DEM, and NOAA-DEM satellite images were used as the input data, whereas the output is the predefined nine wetland types. As a result, two ResU-Net models using Adam and RMSprop optimizer functions show the accuracy higher than 85%, especially in forested intertidal wetlands, aquaculture ponds, and farm ponds. The better performance of these models was proved, compared to Random Forest and Support Vector Machine methods. After optimizing the ResU-Net models, they were also used to map the coastal wetland areas correctly in the northeastern part of Vietnam. The final model can potentially update new wetland types in the southern parts and islands in Vietnam towards wetland change monitoring in real time.

Style APA, Harvard, Vancouver, ISO itp.

37

NAVEDO, JUAN G., i GUILLERMO FERNÁNDEZ. "Use of semi-intensive shrimp farms as alternative foraging areas by migratory shorebird populations in tropical areas". Bird Conservation International 29, nr 2 (30.08.2018): 263–76. http://dx.doi.org/10.1017/s0959270918000151.

Pełny tekst źródła

Streszczenie:

SummaryEvaluating the ability of anthropogenic habitats to serve as surrogates for natural habitats is an increasingly relevant issue in conservation biology. This issue is especially urgent in tropical coastal wetlands that support large concentrations of migratory shorebird populations and are under pressure from development. Here we evaluated the species composition, abundance, and habitat use of Nearctic migratory shorebirds using recently harvested aquaculture ponds during two non-breeding seasons at shrimp farms surrounding Bahía Santa María (BSM), northwestern Mexico. We also estimated shorebird densities at intertidal units in BSM during and after the harvesting season to explore the connectivity with shrimp farms. Over 25,000 individuals of 25 shorebird species used the surveyed farms (∼13% of shrimp-farm development in BSM; 2014–2015: 10 farms, 994 ha; 2015–2016: 8 farms, 924 ha) during the harvest season. The most abundant species were: Western Sandpiper Calidris mauri, Willet Tringa semipalmata, Marbled Godwit Limosa fedoa, dowitchers Limnodromus spp., Black-necked Stilt Himantopus mexicanus and American Avocet Recurvirostra americana. Numbers of birds decreased as the harvest cycle progressed. Most birds (> 70%) were foraging on the ponds, regardless of tidal stage, while numbers increased during high tide for the most abundant species. At surveyed intertidal areas, shorebird densities were overall similar within and between non-breeding seasons. These results indicate that shrimp farms offer ephemeral but consistent foraging habitats used by non-breeding shorebirds, even in vast coastal wetlands offering a high availability of natural intertidal mudflats. Assuming a similar shorebird use in other shrimp ponds not surveyed within BSM, a significant proportion (> 1% of the biogeographic population) of Willet, Marbled Godwit, and Western Sandpiper, as well as imperilled Red Knot Calidris canutus, might use shrimp farms throughout the harvesting season. Before including current semi-intensive shrimp farms within management plans of BSM, further research is mandatory to assess their utility as alternative foraging habitats for shorebird conservation at tropical areas.

Style APA, Harvard, Vancouver, ISO itp.

38

Spruzen, Fiona L., Alastair M. M. Richardson i Eric J. Woehler. "Spatial variation of intertidal macroinvertebrates and environmental variables in Robbins Passage wetlands, NW Tasmania". Hydrobiologia 598, nr 1 (5.10.2007): 325–42. http://dx.doi.org/10.1007/s10750-007-9166-2.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

39

Wu, Haitao, Qiang Guan, Kangle Lu, Guangxuan Han, Baoquan Li i Mengyao Yang. "Effects of Hydrological Connectivity on Snail Assemblages in the Intertidal Zone of Coastal Wetlands". Wetlands 40, nr 5 (16.11.2019): 1627–34. http://dx.doi.org/10.1007/s13157-019-01241-z.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

40

PENG, HE-BO, GUY Q. A. ANDERSON, QING CHANG, CHI-YEUNG CHOI, SAYAM U. CHOWDHURY, NIGEL A. CLARK, XIAOJING GAN i in. "The intertidal wetlands of southern Jiangsu Province, China – globally important for Spoon-billed Sandpipers and other threatened waterbirds, but facing multiple serious threats". Bird Conservation International 27, nr 3 (20.07.2017): 305–22. http://dx.doi.org/10.1017/s0959270917000223.

Pełny tekst źródła

Streszczenie:

SummaryThe Yellow Sea region is of high global importance for waterbird populations, but recent systematic bird count data enabling identification of the most important sites are relatively sparse for some areas. Surveys of waterbirds at three sites on the coast of southern Jiangsu Province, China, in 2014 and 2015 produced peak counts of international importance for 24 species, including seven globally threatened and six Near Threatened species. The area is of particular global importance for the ‘Critically Endangered’ Spoon-billed Sandpiper Calidris pygmaea (peak count across all three study sites: 62 in spring [2015] and 225 in autumn [2014] and ‘Endangered’ Spotted Greenshank Tringa guttifer (peak count across all three study sites: 210 in spring [2014] and 1,110 in autumn [2015]). The southern Jiangsu coast is therefore currently the most important migratory stopover area in the world, in both spring and autumn, for both species. Several serious and acute threats to waterbirds were recorded at these study sites. Paramount is the threat of large-scale land claim which would completely destroy intertidal mudflats of critical importance to waterbirds. Degradation of intertidal mudflat habitats through the spread of invasive Spartina, and mortality of waterbirds by entrapment in nets or deliberate poisoning are also real and present serious threats here. Collisions with, and displacement by, wind turbines and other structures, and industrial chemical pollution may represent additional potential threats. We recommend the rapid establishment of effective protected areas for waterbirds in the study area, maintaining large areas of open intertidal mudflat, and the urgent removal of all serious threats currently faced by waterbirds here.

Style APA, Harvard, Vancouver, ISO itp.

41

Jeong, Min-Su, Chang-Young Choi, Woo-Shin Lee i Ki-Sup Lee. "Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks". PLOS ONE 16, nr 7 (9.07.2021): e0253469. http://dx.doi.org/10.1371/journal.pone.0253469.

Pełny tekst źródła

Streszczenie:

The endangered Black-faced Spoonbill (Platalea minor) strictly breeds in marine environments and is threatened by the rapid loss of coastal wetlands within its breeding range. Adults with chicks are thought to gradually switch feeding sites from freshwater wetlands to coastal mudflats as the chicks’ osmoregulatory system develops. We investigated age-dependent shifts in the diet of Black-faced Spoonbill chicks at four breeding colonies with varying freshwater habitat availability by examining stable isotopes (δ13C, δ15N) between the tip (grown at the age of 10 days) and middle (grown at the age of 22 days) portions of their primary feathers. The δ13C value of the middle portions was significantly higher than that of the tips, which suggested that the ratio of marine resources increased with the growth and development of chicks. A Bayesian isotope mixing model revealed that the diet proportion of marine prey in the early-chick rearing season was slightly higher than in the late-chick rearing season at three colonies in inshore areas, although this proportion was approximately 60% even in the early chick-rearing period. In contrast, isotopic values and reconstructed diet composition suggested that chicks in an offshore colony with limited freshwater wetlands relied more heavily on freshwater diets for both chick-rearing periods (>80%). Our results suggest that the shifts in feeding sites seen in previous studies might be related to the age-dependent dietary shift of chicks, highlighting the importance of freshwater wetlands for spoonbills on offshore islands without an inflow of freshwater in nearby intertidal mudflats. These findings emphasize the importance of freshwater prey and wetlands even for the endangered marine-breeding spoonbills, even though the negative impact of salt stress remains inconclusive.

Style APA, Harvard, Vancouver, ISO itp.

42

Zhu, Xudong, Lingxuan Meng, Yihui Zhang, Qihao Weng i James Morris. "Tidal and Meteorological Influences on the Growth of Invasive Spartina alterniflora: Evidence from UAV Remote Sensing". Remote Sensing 11, nr 10 (22.05.2019): 1208. http://dx.doi.org/10.3390/rs11101208.

Pełny tekst źródła

Streszczenie:

Rapid invasion of Spartina alterniflora into Chinese coastal wetlands has attracted much attention. Many field and remote sensing studies have examined the spatio-temporal dynamics of S. alterniflora invasion; however, spatially explicit quantitative analyses of S. alterniflora invasion and its underlying mechanisms at both patch and landscape scales are seldom reported. To fill this knowledge gap, we integrated multi-temporal unmanned aerial vehicle (UAV) imagery, light detection and ranging (LiDAR)-derived elevation data, and tidal and meteorological time series to explore the growth potential (lateral expansion rates and canopy greenness) of S. alterniflora over the intertidal zone in a subtropical coastal wetland (Zhangjiang estuarine wetland, Fujian, China). Our analyses of patch expansion indicated that isolated S. alterniflora patches in this wetland experienced high lateral expansion over the past several years (averaged at 4.28 m/year in patch diameter during 2014–2017), and lateral expansion rates ( y , m/year) showed a statistically significant declining trend with increasing inundation ( x , h/day; 3 ≤ x ≤ 18 ): y = − 0.17 x + 5.91 , R 2 = 0.78 . Our analyses of canopy greenness showed that the seasonality of the growth potential of S. alterniflora was driven by temperature (Pearson correlation coefficient r = 0.76 ) and precipitation ( r = 0.68 ), with the growth potential peaking in early/middle summer with high temperature and adequate precipitation. Together, we concluded that the growth potential of S. alterniflora was co-regulated by tidal and meteorological regimes, in which spatial heterogeneity is controlled by tidal inundation while temporal variation is controlled by both temperature and precipitation. To the best of our knowledge, this is the first spatially explicit quantitative study to examine the influences of tidal and meteorological regimes on both spatial heterogeneity (over the intertidal zone) and temporal variation (intra- and inter-annual) of S. alterniflora at both patch and landscape scales. These findings could serve critical empirical evidence to help answer how coastal salt marshes respond to climate change and assess the vulnerability and resilience of coastal salt marshes to rising sea level. Our UAV-based methodology could be applied to many types of plant community distributions.

Style APA, Harvard, Vancouver, ISO itp.

43

Coops, H., M. Ohm i A. Nijhuis. "Former Tidal Wetlands Revitalised: Nature Development in the Dordtse Biesbosch Reserve, The Netherlands". Water Science and Technology 29, nr 3 (1.02.1994): 363–65. http://dx.doi.org/10.2166/wst.1994.0135.

Pełny tekst źródła

Streszczenie:

Geomorphological and ecological features belonging to the freshwater tidal landscape in the Rhi-ne/Meuse estuary have been degrading over the past decades. In particular, the intertidal zone was affected due to diminishing of tides and serious bank erosion. To enhance the remaining tidal water movement locally, a plan was proposed to create side channels in the Dordtse Biesbosch, an area adjoining the Nieuwe Merwede riverbranch. In this plan, which was effectuated in the course of 1992, a connection was made between the creeks and the river at both ends, creating small side channels. A monitoring programme was designed to test if predicted developments actually take place, at what timescale, and to observe the impact of extreme events. It involves measurement of sediment topography, water movement, vegetation, benthic meiofauna, fish, and water birds.

Style APA, Harvard, Vancouver, ISO itp.

44

LEI, WEIPAN, JOSÉ A. MASERO, THEUNIS PIERSMA, BINGRUN ZHU, HONG-YAN YANG i ZHENGWANG ZHANG. "Alternative habitat: the importance of the Nanpu Saltpans for migratory waterbirds in the Chinese Yellow Sea". Bird Conservation International 28, nr 4 (17.09.2018): 549–66. http://dx.doi.org/10.1017/s0959270917000508.

Pełny tekst źródła

Streszczenie:

SummaryThe natural coastal wetlands of the East Asian-Australasian Flyway (EAAF) are disappearing at alarming rates, leading to rapid declines of many populations of waterbirds in the most species-rich flyway in the world. The identification and assessment of possible alternative habitats that may buffer the loss of natural wetlands should, therefore, be a priority for the conservation of migratory waterbirds using this flyway. Coastal saltpans are functional wetlands that support large numbers of waterbirds worldwide. The Nanpu Saltpans in the northern Bohai Bay of the Yellow Sea in China are one of the largest (290 km2) saltpan complexes in the world. In this paper, we document the value of the Nanpu Saltpans for supporting waterbirds. The surveys, carried out from 2013 to 2016, included waterbird counts in the saltpans (93 km2) at high and low tide and on the adjacent natural tidal flats (57 km2) at low tide. Of the 89 waterbird species recorded, 27 had maximum counts exceeding the 1% threshold value of estimated flyway populations. The maximum counts of waterbirds in northward migration and southward migration in the Nanpu Saltpans were 96,000 and 93,500, respectively, including both foraging and roosting birds; these figures do not account for turnover, so the total number of birds using the site is likely to be higher. The maximum counts on the adjacent tidal flats at low tide amounted to 73,000 and 20,000 waterbirds during northward and southward migration, respectively, and most of them were foraging birds. In the boreal winter, few birds fed in the saltpans, but several thousand fed on the tidal flats. Waterbirds used the inland ponds (2.0–18.0 km from the intertidal area) mainly for feeding both during low tide and high tide and used the nearshore ponds (0.3–4.3 km from the intertidal area) mainly for high-tide roosting. Some species, such as Black-tailed Godwit Limosa limosa, Marsh Sandpiper Tringa stagnatilis, Pied Avocet Recurvirostra avosetta, and Black-winged Stilt Himantopus himantopus, occurred mainly in the saltpans; other species preferred tidal flats, such as Red Knot Calidris canutus, Great Knot Calidris tenuirostris, Bar-tailed Godwit Limosa lapponica, Eurasian Curlew Numenius arquata, Relict Gull Larus relictus, and Grey Plover Pluvialis squatarola. This study clearly demonstrates the joint ecological function of the Nanpu Saltpan complex and adjacent tidal flats as a key staging area for waterbirds in the EAAF, and as such both urgently warrant protected status.

Style APA, Harvard, Vancouver, ISO itp.

45

HUA, NING, KUN TAN, YING CHEN i ZHIJUN MA. "Key research issues concerning the conservation of migratory shorebirds in the Yellow Sea region". Bird Conservation International 25, nr 1 (10.02.2015): 38–52. http://dx.doi.org/10.1017/s0959270914000380.

Pełny tekst źródła

Streszczenie:

SummaryThe widespread decline of migratory shorebirds in the East Asian-Australasian Flyway (EAAF) is one of the greatest crises for migrating birds. Among the migratory species with known population trends, 88% (22 of 25 species) show population declines, and seven have been listed as threatened or Near Threatened in the IUCN Red List. The decline of migratory shorebirds is related to the deterioration of stopping sites (including staging and stopping sites) in the Yellow Sea, including loss of intertidal wetlands, spread of invasive smooth cordgrass Spartina alterniflora on intertidal flats, an increase in pollution, and an increase in human disturbance. We review research concerning shorebird migration through the Yellow Sea and highlight key research activities required for the conservation of shorebirds in the region. These activities include: confirming the population consequences of loss of stopping sites, estimating migration timing and numbers of shorebirds at stopping sites, determining the differing abilities of species to use alternative habitats, understanding intra- and interspecific differences in the use of stopping sites, maintaining and expanding surveys on shorebirds and habitat condition, and identifying threats to shorebirds beyond habitat loss by reclamation. The information generated by these research activities is required for the design and selection of effective conservation actions to reverse the decline in shorebird populations.

Style APA, Harvard, Vancouver, ISO itp.

46

Lv, Weiwei, Chang-an Ma, Youhui Huang, Yang Yang, Ji Yu, Mingqing Zhang i Yunlong Zhao. "Macrobenthic diversity in protected, disturbed, and newly formed intertidal wetlands of a subtropical estuary in China". Marine Pollution Bulletin 89, nr 1-2 (grudzień 2014): 259–66. http://dx.doi.org/10.1016/j.marpolbul.2014.09.051.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

47

Lv, Weiwei, Wenzong Zhou i Yunlong Zhao. "Macrobenthos functional groups as indicators of ecological restoration in reclaimed intertidal wetlands of China’s Yangtze Estuary". Regional Studies in Marine Science 22 (lipiec 2018): 93–100. http://dx.doi.org/10.1016/j.rsma.2018.06.003.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

48

Olliver, Elizabeth A., i Douglas A. Edmonds. "Defining the ecogeomorphic succession of land building for freshwater, intertidal wetlands in Wax Lake Delta, Louisiana". Estuarine, Coastal and Shelf Science 196 (wrzesień 2017): 45–57. http://dx.doi.org/10.1016/j.ecss.2017.06.009.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

49

van der Deijl, Eveline Christien, Marcel van der Perk i Hans Middelkoop. "Establishing a sediment budget in the newly created “Kleine Noordwaard” wetland area in the Rhine–Meuse delta". Earth Surface Dynamics 6, nr 1 (7.03.2018): 187–201. http://dx.doi.org/10.5194/esurf-6-187-2018.

Pełny tekst źródła

Streszczenie:

Abstract. Many deltas are threatened by accelerated soil subsidence, sea-level rise, increasing river discharge, and sediment starvation. Effective delta restoration and effective river management require a thorough understanding of the mechanisms of sediment deposition, erosion, and their controls. Sediment dynamics has been studied at floodplains and marshes, but little is known about the sediment dynamics and budget of newly created wetlands. Here we take advantage of a recently opened tidal freshwater system to study both the mechanisms and controls of sediment deposition and erosion in newly created wetlands. We quantified both the magnitude and spatial patterns of sedimentation and erosion in a former polder area in which water and sediment have been reintroduced since 2008. Based on terrestrial and bathymetric elevation data, supplemented with field observations of the location and height of cut banks and the thickness of the newly deposited layer of sediment, we determined the sediment budget of the study area for the period 2008–2015. Deposition primarily took place in channels in the central part of the former polder area, whereas channels near the inlet and outlet of the area experienced considerable erosion. In the intertidal area, sand deposition especially takes place at low-lying locations close to the channels. Mud deposition typically occurs further away from the channels, but sediment is in general uniformly distributed over the intertidal area, due to the presence of topographic irregularities and micro-topographic flow paths. Marsh erosion does not significantly contribute to the total sediment budget, because wind wave formation is limited by the length of the fetch. Consecutive measurements of channel bathymetry show a decrease in erosion and deposition rates over time, but the overall results of this study indicate that the area functions as a sediment trap. The total contemporary sediment budget of the study area amounts to 35.7×103 m3 year−1, which corresponds to a net area-averaged deposition rate of 6.1 mm year−1. This is enough to compensate for the actual rates of sea-level rise and soil subsidence in the Netherlands.

Style APA, Harvard, Vancouver, ISO itp.

50

Furaca, Noca B., Antonio M. Hoguane, Fiona Mackay, Marinel Willemse i Avelino A. Langa. "Exploring urbanization and critical habitat loss through land cover change around the Bons Sinais Estuary, Mozambique". Western Indian Ocean Journal of Marine Science, nr 1/2021 (23.12.2021): 43–58. http://dx.doi.org/10.4314/wiojms.si2021.1.4.

Pełny tekst źródła

Streszczenie:

Estuaries supply direct and indirect multi-sectoral opportunities including for transport, natural resource use and climate protection. These provisions support livelihoods and contribute to social and economic development. The Bons Sinais Estuary in Zambézia Province, central Mozambique, is adjacent to the provincial administrative capital Quelimane, some 25 km from the coast. The rapid growth of Quelimane has increased the demand for natural resources from the estuary, including space, food, fuelwood, transport and raw materials for construction and economic activities. Expansion of the built environment has extended into low-lying lands, mostly within the critical estuarine functional zone with inevitable consequences, such as damage to natural habitats and flooding of occupied areas during rainy seasons. The aim of this study was to analyse three decades of change (1991 – 2018) in land use and land cover (LU/LC) in the Bons Sinais Estuary, focussing on the growth of Quelimane city and the transformation of estuarine and surrounding habitats. The method relied on open-access satellite images and a LU/LC change analysis to quantify the spatio-temporal changes brought about by economic development and related human activities. A combination of low-intensity fieldwork and satellite-derived data (Landsat-5, sensor: Thematic Mapper and Landsat-8; sensors: Operational Land Imager, Thermal Infra-Red Scanner) was used to generate LU/LC information classified according to the features: mangrove trees; wetlands; estuary intertidal areas; built-up area; cultivated trees; and cultivated land. From 1991 onwards, there was an overall increase in cultivated crops (66 %), development (79 %) (including rural human settlements) and intertidal mudflats (12 %) with a concomitant decline in critical wetlands (16 %) and mangroves (12 %). The study predicts a worsening of the impacts on the estuarine ecosystem with further growth of Quelimane city. To reverse the negative trend on estuary health, the recommendation is for management interventions that promote sustainable LU, and urban development plans that consider ecosystem conservation and active restoration.

Style APA, Harvard, Vancouver, ISO itp.

Artykuły w czasopismach na temat „Intertidal wetlands”

Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych