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128 results for “River deltas”
Data from: Anthropogenic disturbance of tropical forests threatens pollination services to açaí palm in the Amazon river delta
The açaí palm Euterpe oleracea Mart. in the Amazon river delta has seen rapid expansion to meet increased demand for its fruit. This has been achieved by transforming lowland forest habitats (floodplains) into simplified agroforests and intensive plantation in upland areas. As açaí palm makes an important contribution to the economy and food security of local communities, identifying management approaches that support biodiversity and ecosystem processes that underpin fruit production on açaí farms is essential. We compared flower-visitor communities and açaí fruit production in floodplain forests and upland plantations, across gradients of local management intensity (i.e. açaí density per ha) and surrounding forest cover. The relative contribution of biotic pollination and degree of pollen limitation were assessed using insect exclusion and hand-pollination experiments. We found that açaí flower visitors are highly diverse (c. 200 distinct taxa) and had variable responses to disturbance. Bee visitation was higher in floodplains and positively related to surrounding forest cover, but other flower visitors, including specialised curculionid beetles, were unresponsive to changes in surrounding forest cover. However, intensive management practices (i.e. high açaí palm densities) in floodplains and uplands had contrasting effects on flower-visitor communities, with flower-visitor richness being lower on intensively managed floodplain farms and ant densities being higher on intensive upland farms. Pollination experiments revealed açaí palm to be highly dependent on biotic pollination. Fruit set in open-pollinated inflorescences was positively related to flower-visitor richness and specialised curculionid beetle visitation, whereas the presence of ants on inflorescences had a negative effect. Synthesis and applications. Our study shows that pollinators are essential for açaí fruit production, but that intensive farming practices have eroded the relationship between surrounding forest cover and ecosystem function in floodplains (i.e. conversion of native forest into simplified agroforests) and increased the frequency of antagonistic interactions in uplands (e.g. high ant densities). These findings underline the value of extensive management practices, such as the maintenance of other tree species within farms and adjacent unmanaged forest patches, to ensure the long-term sustainability of açaí fruit production in the Amazon river delta.
Nipponaclerda biwakoensis infestation of Phragmites australis in the Mississippi River Delta, USA: Do fungal microbiomes play a role?
<p>Recently, significant die-back of nonnative common reed, <i>Phragmites australis,</i> has been reported in the Mississippi River Delta (MRD), Louisiana, USA. This dieback has been attributed to an invasive scale insect, <i>Nipponaclerda biwakoensis</i>. We test whether fungi are involved in the recent infestation by this insect and subsequent die-offs of <i>Phragmites australis</i>. Several haplotypes of <i>P. australis</i> occur in the MRD, and the European (M) and Delta (M1) haplotypes appear to experience differing levels of <i>N. biwakoensis </i>infestation. We tested whether these haplotypes differed in their fungal microbiomes in both their leaf and stem tissues, and whether differences in fungal community composition were linked to the level of infestation using a metabarcoding Internal Transcribed Spacer (ITS) amplicon sequencing approach. Our analyses showed differences in fungal community composition and diversity between haplotypes and tissue types, but none of these differences were directly correlated with <i>N. biwakoensis</i> infestation severity. However, we did find that the European haplotype hosted higher putative pathogen loads in stem tissues compared to the Delta haplotype, which may confer resistance to herbivory, though it is possible that differences in infestation between haplotypes are due to morphology.</p>
Distribution. Botswana, in Okavango Delta along Gomoti River, Zambia in Kafue National Park, and Zimbabwe in Mana Pools National Park; it may occur in Mozambique and South Africa. in Vespertilionidae
Distribution. Botswana, in Okavango Delta along Gomoti River, Zambia in Kafue National Park, and Zimbabwe in Mana Pools National Park; it may occur in Mozambique and South Africa.
Distribution. North America, from the Mackenzie River Delta, Northwest Territories, Canada, S throughout Canada and USA, excluding peninsular Florida and arid parts of the SW, to N Mexico (Baja California to Tamaulipas). North American Beavers have been introduced into Europe (Finland, Russia, Central Europe), Russian Far East (Kamchatka and Sakhalin Island), and Tierra del Fuego, Argentina. in Castoridae
Distribution. North America, from the Mackenzie River Delta, Northwest Territories, Canada, S throughout Canada and USA, excluding peninsular Florida and arid parts of the SW, to N Mexico (Baja California to Tamaulipas). North American Beavers have been introduced into Europe (Finland, Russia, Central Europe), Russian Far East (Kamchatka and Sakhalin Island), and Tierra del Fuego, Argentina.
Distribution. Coastal areas and large inland rivers of West Africa from the Senegal River at the Mauritania—Senegal border S to the Longa River in Angola. They occur as far as 2000 km from the ocean in the Inner Niger Delta of Mali, up to 75 km off the continental shore in the shallows and mangrove creeks of the Bijagos Archipelago of Guinea-Bissau, and as far E as Lake Tréné in Chad; formerly in Lake Chad itself. in Trichechidae
Distribution. Coastal areas and large inland rivers of West Africa from the Senegal River at the Mauritania—Senegal border S to the Longa River in Angola. They occur as far as 2000 km from the ocean in the Inner Niger Delta of Mali, up to 75 km off the continental shore in the shallows and mangrove creeks of the Bijagos Archipelago of Guinea-Bissau, and as far E as Lake Tréné in Chad; formerly in Lake Chad itself.
Distribution. NE & S Venezuela (Orinoco Delta and S of the Orinoco River), the Guianas, N & NC Brazil (along the Amazon River W to Maranhao and S to Para and Mato Grosso states), and into upper Amazon Basin of SW Colombia (N up to Meta and Guainia departments), E Ecuador, and NE & E Peru; its S limit in W Amazonian Brazil is unclear. Additional visual records are described for SE Para State and need to be confirmed. in Megalonychidae
Distribution. NE & S Venezuela (Orinoco Delta and S of the Orinoco River), the Guianas, N & NC Brazil (along the Amazon River W to Maranhao and S to Para and Mato Grosso states), and into upper Amazon Basin of SW Colombia (N up to Meta and Guainia departments), E Ecuador, and NE & E Peru; its S limit in W Amazonian Brazil is unclear. Additional visual records are described for SE Para State and need to be confirmed.
Distribution. NE Venezuela, in the Orinoco River Delta and the Gulf of Paria (E Monagas and Delta Amacuro states). in Didelphidae
Distribution. NE Venezuela, in the Orinoco River Delta and the Gulf of Paria (E Monagas and Delta Amacuro states).
: On following pages 89. Miss Waldron's Red Colobus (Piliocolobus waldronae); 90. Zanzibar Red Colobus (Piliocolobus pennantil); 93. Bouvier's Red Colobus (Piliocolobus bouvieri); 94. Niger Delta Red Colobus (Piliocolobus epieni); 95 97. Semliki Red Colobus (Piliocolobus semlikiensis); 98. Foa''s Red Colobus (Piliocolobus foal); 99. Lang's Red Colobus (Piliocolobus parmentieri); 102. Ashy Red Colobus (Piliocolobus tephrosceles); 103. Tshuapa Red Colobus (Piliocolobus kirkii); 91. Udzungwa Red Colobus (Piliocolobus gordonorum); 92. Pennant's Red Colobus (Piliocolobus. Preuss's Red Colobus (Piliocolobus preussi); 96. Tana River Red Colobus (Piliocolobus rufomitratus): (Piliocolobus langi); 100. Oustalet's Red Colobus (Piliocolobus oustaleti); 101. Lomami Red Colobus tholloni); 104. Olive Colobus (Procolobus verus). in Cercopithecidae
: On following pages 89. Miss Waldron's Red Colobus (Piliocolobus waldronae); 90. Zanzibar Red Colobus (Piliocolobus pennantil); 93. Bouvier's Red Colobus (Piliocolobus bouvieri); 94. Niger Delta Red Colobus (Piliocolobus epieni); 95 97. Semliki Red Colobus (Piliocolobus semlikiensis); 98. Foa''s Red Colobus (Piliocolobus foal); 99. Lang's Red Colobus (Piliocolobus parmentieri); 102. Ashy Red Colobus (Piliocolobus tephrosceles); 103. Tshuapa Red Colobus (Piliocolobus kirkii); 91. Udzungwa Red Colobus (Piliocolobus gordonorum); 92. Pennant's Red Colobus (Piliocolobus. Preuss's Red Colobus (Piliocolobus preussi); 96. Tana River Red Colobus (Piliocolobus rufomitratus): (Piliocolobus langi); 100. Oustalet's Red Colobus (Piliocolobus oustaleti); 101. Lomami Red Colobus tholloni); 104. Olive Colobus (Procolobus verus).
Distribution. SE coastal Kenya, confined to a narrow stretch of forest along the lower Tana River, mainly from Garsen N nearly as far as Wenje; recently also found in the forests of the Tana River Delta. in Cercopithecidae
Distribution. SE coastal Kenya, confined to a narrow stretch of forest along the lower Tana River, mainly from Garsen N nearly as far as Wenje; recently also found in the forests of the Tana River Delta.
Distribution. SE Nigeria, in a few small, scattered populations in forest and derived savanna between the lower Niger and Cross rivers, including the Niger Delta (specifically, from W of Oguta at 5° 42° N, just E of the Niger); it occurs N as far as the Eastern Aboine River in Ebonyi State. in Cercopithecidae
Distribution. SE Nigeria, in a few small, scattered populations in forest and derived savanna between the lower Niger and Cross rivers, including the Niger Delta (specifically, from W of Oguta at 5° 42° N, just E of the Niger); it occurs N as far as the Eastern Aboine River in Ebonyi State.
Distribution. SE Kenya, endemic to riparian forest patches along the lower Tana River; an additional small population was recently discovered in the Tana River Delta. in Cercopithecidae
Distribution. SE Kenya, endemic to riparian forest patches along the lower Tana River; an additional small population was recently discovered in the Tana River Delta.
Soil respiratation data for the Yellow River Delta coastal wetlands
<p>Continuous soil respiration data which is composed of heterotrophic respiration and autotrophic respiration</p>
The role of tropical cyclone on Changjiang River subaqueous delta geomorphology: a numerical investigation of Tropical Cyclone Danas (2019)
<p>ecs_mesh: Model domain used for numerical simulation in Matlab data format.</p> <p>Variable description of ecs_mesh.mat:</p> <p>nodex/nodey: Longitude/Latitude of the vertices of the triangles</p> <p>cellx/celly: Longitude/Latitude of the faces of the triangles</p> <p>nodeh: Bathymetry of the vertices</p> <p>nv: Vertices composition of the triangles</p> <p> </p> <p>model_result_baroclinic: Used FVCOM model output from 2019-07-01 to 2019-08-01 in Matlab data format.</p> <p>Variable description of model_result_baroclinic.mat:</p> <p>SSC: Total suspended sediment concentration of all sediment classes, units: g/L</p> <p>deposition_flux: Deposition flux of suspended sediment, units: kg/m^2/h</p> <p>divergence_sed_flux: depth-integrated divergence of sediment flux, units: kg/m^2/h</p> <p>erosion_flux: Erosion flux of sea-bed surface sediment, units: kg/m^2/h</p> <p>salinity: sea water salinity, units: psu</p> <p>taub: Total bed stress, units: Pa</p> <p>time_model: Time of the results, time zone: LST</p> <p>u: Eastward water velocity, units: m/s</p> <p>v: Northward water velocity, units: m/s</p> <p>zeta: Water surface elevation</p> <p> </p> <p>model_verify: Bed elevation data from ADV, wave parameters from buoy, and bottom suspended sediment concentration from OBS in Matlab data format.</p> <p>Variable description of model_verify.mat:</p> <p>ADV_BEC_xx: Bed Elevation measurement from ADV at Station xx, units: mm</p> <p>ADV_time_xx: Measurement time of bed elevation of ADV at Station xx, time zone: LST</p> <p>Buoy_hs_S1: Significant wave height measurement from Buoy at Station S1, units: m</p> <p>Buoy_time_S1: Measurement time of Buoy at Station S1, time zone: LST</p> <p>Buoy_tpeak_S1: Peak wave period measurement from Buoy at Station S1, units: s</p> <p>OBS_SSC_S1: Suspended sediment concentration measurement from OBS at Station S1, units: g/L</p> <p>OBS_time_S1: Measurement time of OBS at Station S1, time zone: LST</p> <p>tauc_mtke_S1: In-situ bottom shear stress calculated from turbulence kinetic energy method, units: Pa</p> <p>time_mtke_S1: Time of calculated bottom shear stress, time zone: LST</p> <p>time_wind: Time of surface wind at S1 from CFSv2 model from 2019-06-01 to 2019-08-01 time zone: LST</p> <p>u_wind: Eastward velocity of surface wind at S1 from CFSv2 model, units: m/s</p> <p>v_wind: Northward velocity of surface wind at S1 from CFSv2 model, units: m/s</p>
Research Data for "Occurrence of CO2 and CH4 and the behavior of inorganic carbon in the groundwater of the Pearl River Delta"
<p>Supplementary material includes the measured data for this paper titled ""Occurrence of CO2 and CH4 and the behavior of inorganic carbon in the groundwater of the Pearl River Delta".</p>
Data and code for reconstructing river and delta landscape evolution using image warping
<p>This repository contains code and data for image warping experiments associated with a manuscript entitled "Bridging Gaps in Image Observations of River and Delta Landscapes Using Image Warping", which is currently under review at JGR Earth Surface.</p>
Figure 2 in Stranded humpback whale (Megaptera novaeangliae) (Cetacea: Balaenopteridae) in Paraná River Delta, Buenos Aires Province, Argentina. Comments on the occurrence of marine
Figure 2. (A) CFA-MA-13084 specimen before start preparation. (B) Sampling extraction work.
Figure 3 in Stranded humpback whale (Megaptera novaeangliae) (Cetacea: Balaenopteridae) in Paraná River Delta, Buenos Aires Province, Argentina. Comments on the occurrence of marine
Figure 3. Megaptera novaeangliae (CFA-MA-13084) mounted skeleton.
Pearl River Delta FVCOM model mangrove forests scenarios
<p>Model data presented in: De Dominicis, M., Wolf, J., van Hespen, R., Zheng, P., Hu. Z. "Mangrove forests can be an effective coastal defence in the Pearl River Delta, China", <em>Communications Earth & Environment</em> (2023).</p> <p>To explore the effects of vegetation on storm surge dynamics and currents, we used a Finite Volume Community Ocean Model implementation for the South China Sea and the Pearl River Delta and simulated Typhoon Hato (2017) one of the strongest typhoons to affect the coastal areas of the Pearl River Delta in recent decades. We numerically modelled the protection capability of the mangrove wetlands in Shenzhen Bay and in the upper estuary river branches close to Guangzhou to determine their ability to mitigate coastal flooding. Additionally, we analyzed how the effectiveness of mangroves changes under different sea level rise scenarios. </p> <p>The dataset consists of water elevation and horizontal currents for 40 model experiments (see Table 1 in De Dominicis et al, 2023).</p>
Quantifying flow velocities in river deltas via remotely sensed suspended sediment concentration
<p><strong>bathymetry and model velocity field</strong></p>
Supplementary material 3 from: Gomez Cardona CJ, Moreno JY, Contreras A, Sanchez-Nuñez DA, Arciniegas Moreno N, Guerrero D, Viloria Maestre EA, Lopez Navarro J (2023) Accounting of marine and coastal ecosystems at the Ramsar Site, Estuarine Delta System of the Magdalena River, Ciénaga Grande de Santa Marta, Colombia. One Ecosystem 8: e98852. https://doi.org/10.3897/oneeco.8.e98852
Combined condition account for the mangrove ecosystem types present in the CGSM Ramsar site (2017-2019)
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