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

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.

Identifier: NRW_DS116796

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.

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.

Dataset Reference Date (Publication): 2016-12-31

Temporal Extent

Begin date: 2016-07-29

End date: 2016-09-14

Topic category

Biota
Environment

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

Fowles

c/o Natural Resources Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Extent

Geographic Extent: GWYNEDD - GWYNEDD

Distribution

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)

Resource Locator

Data Download

World Wide Web page

Data quality

Quality Scope: Dataset

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

GEMET - INSPIRE themes, version 1.0

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

Exposed Riverine Sediment (ERS)
rove beetles
staphylinidae
invertebrate surveys
invertebrates (see also specific species)

Type: Theme

Citation

Date (Publication): 2023-12-31

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

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

Constraints

Limitations on Public Access and Use

Restriction type: 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

Use constraints type: 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

File Identifier: 4f4c4942-4343-5764-6473-313136373936 XML

Metadata Language: English

Resource type: Dataset

Metadata Date: 2024-05-31T09:39:37.135Z

Metadata Standard Name: NRW

Metadata Standard Version: 1.0

pointOfContact

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Publishing Body

Access the portal

Full access to the portal and metadata.

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

Identification

Temporal Extent

Extent

Extent

Distribution

Distribution

Quality

Data quality

Keywords

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

Constraints

Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

Use Constraints

Attribution Statement

Licence

Metadata

Metadata

Publishing Body