cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.15468/dl.kfwqkc
title: Occurrence Download

description: A dataset containing 193 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Gordonia brenesii (Standl.) Q.Jiménez"
 ]
}

 The dataset includes 193 records from 26 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0271355-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.end3e6
title: Occurrence Download

description: A dataset containing 9533 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Nestor meridionalis (Gmelin, 1788)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 9533 records from 24 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0009087-190621201848488/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.svf6qy
title: Occurrence Download

description: A dataset containing 688 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Noccaea praecox (Wulfen) F.K.Mey.",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 688 records from 45 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0001739-240202131308920/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.x2wkgh
title: Occurrence Download

description: A dataset listing the 9 species recorded in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON((104.99084 -9.19006,114.75769 -9.19006,114.75769 -5.47668,104.99084 -5.47668,104.99084 -9.19006))",
 "OccurrenceStatus is Present",
 "TaxonKey is Cervidae"
 ]
}

 The dataset's 9 records were derived from 6 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0262593-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.j1tm2i
title: Occurrence Download

description: A dataset containing 88431 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Cervus elaphus Linnaeus, 1758",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 88431 records from 267 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0009090-190621201848488/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.jwn2my
title: Occurrence Download

description: A dataset containing 3 species occurrences available in GBIF matching the query:
{
 "and" : [
 "ScientificName is Myiothlypis luteoviridis striaticeps Cabanis, 1873",
 "BasisOfRecord is one of (Machine Observation, Human Observation)",
 "Year 2011-2021",
 "HasCoordinate is true",
 "OccurrenceStatus is Present",
 {
 "not" : {
 "BasisOfRecord" : [
 "is one of (Fossil, Living Specimen, Specimen, Material citation, Material sample)"
 ]
 }
 }
 ]
}

 The dataset includes 3 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0119113-230530130749713/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.d37eyb
title: Occurrence Download

description: A dataset containing 1642226 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is Specimen",
 "Country is Colombia",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 1642226 records from 1312 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0182165-210914110416597/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.maqz98
title: Occurrence Download

description: A dataset containing 288 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Rubus trifidus Thunb.",
 "HasCoordinate is TRUE",
 "HasGeospatialIssue is False",
 "DecimalLatitude is less than 90",
 "DecimalLongitude is less than 180",
 "DecimalLatitude is greater than -90",
 "DecimalLongitude is greater than -180"
 ]
}

 The dataset includes 288 records from 31 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0433416-210914110416597/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.t6bh4s
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Scilla lucis Speta"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0119136-230530130749713/datasets/export for details.
DOI: 10.15468/dl.65setc
title: Occurrence Download

description: A dataset containing 10879 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Year 1969-2020",
 "Geometry POLYGON((-171.14955 12.75299,-128.65444 12.75299,-128.65444 29.75983,-171.14955 29.75983,-171.14955 12.75299))",
 "HasCoordinate is true",
 "TaxonKey is Lonchura punctulata (Linnaeus, 1758)",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 10879 records from 8 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0002512-200613084148143/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.9rck5b
title: Occurrence Download

description: A dataset containing 52 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Jellyella eburnea (Hincks, 1891)"
 ]
}

 The dataset includes 52 records from 4 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0135033-230530130749713/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.v6f3as
title: Occurrence Download

description: A dataset containing 2643 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Gonatium rubens (Blackwall, 1833))",
 "Geometry POLYGON((-9.36035 44.71551,-10.59082 42.81152,-11.82129 36.80928,-7.69043 36.17336,-3.38379 35.88905,3.12012 38.13456,9.18457 38.20366,11.7334 37.16032,12.78809 34.74161,17.09473 33.79741, 23.15918 34.23451,30.10254 32.62087,33.2666 32.99024,35.72754 35.03,33.00293 35.53223,28.69629 35.17381,28.34473 36.31513,25.7959 37.50973,24.91699 39.90974,28.78418 40.6473,30.71777 41.17865,36.87012 45.213,38.18848 46.98025,38.71582 47.7541,39.94629 47.93107,40.20996 49.61071,37.0459 50.34546,35.72754 50.40152,33.79395 52.26816,31.68457 51.94426,31.4209 53.27835,32.56348 53.43572,30.98145 54.77535,30.89355 55.52863,28.43262 56.02295,27.20215 57.65716,27.37793 58.30949,27.90527 59.17593,29.66309 59.88894,27.6416 60.58697,31.50879 62.75473,28.78418 69.83962,30.89355 70.28912,29.22363 71.55274,21.75293 71.30079,14.28223 70.14036,11.38184 67.47492,4.87793 63.66576,-5.53711 71.52491,-10.63477 71.69129,-21.5332 67.74276,-28.56445 65.36684,-24.3457 61.35461,-9.36035 44.71551))",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1980",
 "Year is less than or equal to 2021"
 ]
}

 The dataset includes 2643 records from 115 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0241675-210914110416597/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.lmjh81
title: Occurrence Download

description: A dataset containing 54 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Geometry POLYGON((13.71094 67.52874,31.99219 29.96256,86.83594 -18.17925,168.39844 -18.84598,154.33594 68.06018,13.71094 67.52874))",
 "HasCoordinate is true",
 "TaxonKey is Python bivittatus Kuhl, 1820",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 54 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0004903-190918142434337/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.3f6ub8
title: Occurrence Download

description: A dataset containing 1052509 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Gonepteryx rhamni (Linnaeus, 1758))",
 "Geometry POLYGON((-9.36035 44.71551,-10.59082 42.81152,-11.82129 36.80928,-7.69043 36.17336,-3.38379 35.88905,3.12012 38.13456,9.18457 38.20366,11.7334 37.16032,12.78809 34.74161,17.09473 33.79741, 23.15918 34.23451,30.10254 32.62087,33.2666 32.99024,35.72754 35.03,33.00293 35.53223,28.69629 35.17381,28.34473 36.31513,25.7959 37.50973,24.91699 39.90974,28.78418 40.6473,30.71777 41.17865,36.87012 45.213,38.18848 46.98025,38.71582 47.7541,39.94629 47.93107,40.20996 49.61071,37.0459 50.34546,35.72754 50.40152,33.79395 52.26816,31.68457 51.94426,31.4209 53.27835,32.56348 53.43572,30.98145 54.77535,30.89355 55.52863,28.43262 56.02295,27.20215 57.65716,27.37793 58.30949,27.90527 59.17593,29.66309 59.88894,27.6416 60.58697,31.50879 62.75473,28.78418 69.83962,30.89355 70.28912,29.22363 71.55274,21.75293 71.30079,14.28223 70.14036,11.38184 67.47492,4.87793 63.66576,-5.53711 71.52491,-10.63477 71.69129,-21.5332 67.74276,-28.56445 65.36684,-24.3457 61.35461,-9.36035 44.71551))",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1980",
 "Year is less than or equal to 2021"
 ]
}

 The dataset includes 1052509 records from 1129 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0241677-210914110416597/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.nf6p7j
title: Occurrence Download

description: A dataset containing 2506 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is one of (South Africa, Lesotho, Eswatini)",
 "TaxonKey is one of (Xenus cinereus (Güldenstädt, 1775))",
 "BasisOfRecord is one of (Human Observation, Observation)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1950",
 "OccurrenceStatus is Present",
 "DistanceFromCentroidInMeters is greater than or equal to 2000"
 ]
}

 The dataset includes 2506 records from 10 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003919-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.mkbs6n
title: Occurrence Download

description: A dataset containing 246562 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Chelonia mydas (Linnaeus, 1758)"
 ]
}

 The dataset includes 246562 records from 486 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003896-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.p5rt7m
title: Occurrence Download

description: A dataset containing 41 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Panicum miliaceum var. ruderale Kitag."
 ]
}

 The dataset includes 41 records from 4 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003920-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.6084/m9.figshare.28238420
title: Data for filmpaper.docx

description: <b>Background</b>: The escalating demand for eco-friendly alternatives in nanoparticle synthesis has spurred the exploration of plant-based approaches, offering promising applications across various biomedical domains. This study delved into the synthesis of silver nanoparticles (AgNPs) utilizing <i>Aloe vera </i><i>(L.) Burm.f.</i> extract and subsequently investigated their potential to enhance the antimicrobial properties of Eri silk fibroin Films (ESF). The objective was to develop biodegradable antimicrobial wound dressing materials. Silk fibroin, a natural biopolymer derived from Eri silkworm (<i>Samia cynthia ricini </i>Donovan) cocoons, exhibits inherent antimicrobial characteristics. By synergistically integrating AgNPs into ESF, we sought to augment its antimicrobial efficacy, providing a versatile and sustainable solution for wound healing and infection prevention.<b>Methods</b>: The green synthesis of AgNPs involved using <i>A. vera</i> extract to reduce silver nitrate (AgNO₃). The nanoparticles were characterized using various techniques including FTIR, UV-visible spectroscopy, and SEM with EDX analysis. Uniformly sized (0.42 cm²) films were prepared in six different concentrations of blended Eri silk fibroin Films (ESF) with <i>A. vera</i> Silver Nanoparticles (AVAg). These were compared against non-blended ESF as a control and a commercially available, non-medicated cotton gauze (Surgicom®) as a positive control. The antimicrobial efficacy was tested against common human pathogens such as<i> Escherichia coli, Staphylococcus aureus, </i>and<i> Candida albicans</i>.<b>Results</b>: The blended ESF films displayed enhanced water absorbability (81.5%-91% after 96 h), porosity (78.38%-88.46%), and a water vapor transmission rate of 2503.19 g/m²/day, demonstrating their potential as wound dressings. SEM analysis showed a strong presence of silver on the fibrous matrix, with EDX revealing a high silver composition (78.66±0.70%). In vitro antimicrobial assays indicated substantial efficacy against <i>E. coli</i>, <i>S. aureus</i>, and <i>C. albicans</i>, highlighting the promising role of AgNPs in combating antibiotic resistance.<b>Conclusion</b>: The <i>A. vera</i>-assisted green synthesis of AgNPs is a sustainable and effective method for producing stable nanoparticles. When incorporated into silk fibroin films, these nanoparticles enhance the material’s physical and antimicrobial properties, making it suitable for biomedical applications, particularly wound healing and infection control.
DOI: 10.34808/tj9t-6478
title: Spatial development concept for the Outer Port in Gdańsk - work number 2/22/23

description: The research series presents in a form of a design chart possible variants of the spatial layout of the water and land areas of the Outer Port of Gdańsk using different combinations of terminals with different annual turnover volumes. Individual works in the series present different solutions for anchorages, channels, port entrances, turntables and basins, both in terms of their size and mutual location. Work number 2/22/23 is the subject of this study.
The work number 2/22/23 provide for the westward extension of the North Port of Gdansk. The premise of the new part of the port is based on the construction of a massive north-facing pier. The pier will be surrounded by breakwaters from the east-north, north and west-north sides. Between the east side of the the pier and the east breakwater, and between the west side of the pier and the west breakwater, there will be water areas with a turning tables. Both the western and eastern water areas will have their own entrances, which will be connected to the existing approach channels to the port of Gdańsk. The two water areas will also be connected to each other by the inner port canal to the north.
DOI: 10.15468/dl.8mdef6
title: Occurrence Download

description: A dataset containing 49396 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is one of (South Africa, Lesotho, Eswatini)",
 "TaxonKey is one of (Chrysococcyx klaas (Stephens, 1815))",
 "BasisOfRecord is one of (Human Observation, Observation)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1950",
 "OccurrenceStatus is Present",
 "DistanceFromCentroidInMeters is greater than or equal to 2000"
 ]
}

 The dataset includes 49396 records from 9 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003921-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.td5uqz
title: Occurrence Download

description: A dataset containing 13505 species occurrences available in GBIF matching the query:
{
 "and" : [
 "DatasetKey is University of Hawaii Insect Museum",
 "Geometry POLYGON((-157.94961 21.72179,-158.025 21.73761,-158.09387 21.692,-158.20555 21.61941,-158.29862 21.61103,-158.32189 21.56822,-158.25488 21.46212,-158.20555 21.4007,-158.14599 21.28716,-158.02035 21.28436,-157.88167 21.24155,-157.71229 21.24341,-157.6155 21.28529,-157.649 21.38674,-157.71229 21.48446,-157.78581 21.51331,-157.83607 21.58684,-157.94961 21.72179))"
 ]
}

 The dataset includes 13505 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003924-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.dgmz8w
title: Occurrence Download

description: A dataset containing 23388 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is one of (South Africa, Lesotho, Eswatini)",
 "TaxonKey is one of (Hirundo fuligula Lichtenstein, 1842)",
 "BasisOfRecord is one of (Human Observation, Observation)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1950",
 "OccurrenceStatus is Present",
 "DistanceFromCentroidInMeters is greater than or equal to 2000"
 ]
}

 The dataset includes 23388 records from 2 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003923-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.4u4n9w
title: Occurrence Download

description: A dataset containing 4280 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is one of (Living Specimen, Specimen)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Papaver rhoeas L.",
 "Year 1970-2025"
 ]
}

 The dataset includes 4280 records from 253 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003925-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.tay8tq
title: Occurrence Download

description: A dataset containing 2310 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is one of (South Africa, Lesotho, Eswatini)",
 "TaxonKey is one of (Brunhilda erythronotos (Vieillot, 1817))",
 "BasisOfRecord is one of (Human Observation, Observation)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1950",
 "OccurrenceStatus is Present",
 "DistanceFromCentroidInMeters is greater than or equal to 2000"
 ]
}

 The dataset includes 2310 records from 5 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003928-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.zdwccn
title: Occurrence Download

description: A dataset containing 4589 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Vespa mandarinia Smith, 1852"
 ]
}

 The dataset includes 4589 records from 83 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003927-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.h7z2g8
title: Occurrence Download

description: A dataset containing 2963 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Canis lupus Linnaeus, 1758",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Country is Canada"
 ]
}

 The dataset includes 2963 records from 41 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003930-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.hhd46q
title: Occurrence Download

description: A dataset containing 99162 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is one of (South Africa, Lesotho, Eswatini)",
 "TaxonKey is one of (Sylvietta rufescens (Vieillot, 1817))",
 "BasisOfRecord is one of (Human Observation, Observation)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1950",
 "OccurrenceStatus is Present",
 "DistanceFromCentroidInMeters is greater than or equal to 2000"
 ]
}

 The dataset includes 99162 records from 9 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003929-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.3myehr
title: Occurrence Download

description: A dataset containing 1758 species occurrences available in GBIF matching the query:
{
 "and" : [
 "GadmGid is one of (ITA, ITA.8_1)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Canis lupus Linnaeus, 1758",
 "Year 2015-2025"
 ]
}

 The dataset includes 1758 records from 8 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003931-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.f4ktyv
title: Occurrence Download

description: A dataset containing 20618 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is one of (South Africa, Lesotho, Eswatini)",
 "TaxonKey is one of (Mirafra fasciolata (Sundevall, 1850))",
 "BasisOfRecord is one of (Human Observation, Observation)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1950",
 "OccurrenceStatus is Present",
 "DistanceFromCentroidInMeters is greater than or equal to 2000"
 ]
}

 The dataset includes 20618 records from 5 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003933-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.b6n5bj
title: Occurrence Download

description: A dataset containing 21 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is Specimen",
 "Country is South Africa",
 "TaxonKey is Litsea glutinosa (Lour.) C.B.Rob."
 ]
}

 The dataset includes 21 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003934-250117142028555/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.6084/m9.figshare.28235816
title: <b>Trophic Level Spectrum can express the Influence of Habitat Variations on Food Webs in Large Rivers</b>

description: a dataset of <i>Trophic Level Spectrum can express the Influence of Habitat Variations on Food Webs in Large Rivers</i>