Invertebrates Recorded on Exposed Riverine Sediments at Llanelltyd on the Afon Mawddach in 2016.

  • English
  • wel
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In order to alleviate flooding problems on the Afon Mawddach at Llanelltyd, Natural Resources Wales is considering the removal of gravel from shingle bars immediately upstream and downstream of the bridge. Data was collected to evaluate the current significance of these bars for Exposed Riverine Sediments invertebrates and to indicate the possible impact of gravel removal on the Exposed Riverine Sediments fauna. This dataset holds specialist invertebrate species of Exposed Riverine Sediments recorded on three dates in July and September 2016. Comparisons are made with a similar survey carried out on the Tan-lan bar in 2003 and Exposed Riverine Sediment Quality Indices are presented. Unseasonal floods during August and September may have limited the range of species, but it would also appear that changes to the topography of the Tan-lan (upstream) sediment bar may also be responsible for limiting the area of habitat. The current survey did not yield sufficient species to allow a reliable index to be calculated but there is no reason to suppose that the Llanelltyd shingle bars are no longer important to the Exposed Riverine Sediments assemblage on the river.

Identification

Dynodydd
Identifier
NRW_DS116796
Teitl Amgen
Alternative Title
  • Creaduriaid Di-asgwrn-cefn a Gofnodwyd ar Waddodion Afonol Agored yn Llanelltud ar Afon Mawddach yn 2016
  • The importance of exposed riverine sediments at Llanelltyd on the Afon Mawddach for invertebrates in 2016.
Laith Metadata
Metadata Language
English
Lineage

Sampling techniques included visual searches, splash-sampling and excavation sampling. Invertebrate identifications were by a competent taxonomist.
Additional Information

Fowles, A.P. (2016), The importance of exposed riverine sediments at Llanelltyd on the Afon Mawddach for invertebrates in 2016, NRW Evidence Report No: 182, 21pp, Natural Resources Wales, Bangor.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2016-12-31
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Fowles
c/o Natural Resources Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 

Extent

Extent

Hyd
Geographic Extent
GWYNEDD - GWYNEDD
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Dosbarthiad
Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Database ()

    Specification

    [A] Published report – electronic version (Microsoft Word and Adobe PDF formats) [B] Species records, which are held on the NRW Recorder 6 database (Welsh Invertebrate Database)

Lleolwr Adnoddau
Resource Locator
Data Download

World Wide Web page

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
Conformity
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Explanation
Degree
false
Lineage

Sampling techniques included visual searches, splash-sampling and excavation sampling. Invertebrate identifications were by a competent taxonomist.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • Exposed Riverine Sediment (ERS)
  • rove beetles
  • staphylinidae
  • invertebrate surveys
  • invertebrates (see also specific species)
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

The importance of exposed riverine sediments at Llanelltyd on the Afon Mawddach for invertebrates in 2016
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
 

Attribution Statement

Other constraints
Open Government Licence (OGL)
 

Licence

Other constraints
Open Government Licence (OGL)
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313136373936 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2024-05-31T09:39:37.135Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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