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Freshwater Invertebrates: Survey notes from the field

Danny Gibson |

 

This entry marks the beginning of a series documenting freshwater invertebrates as part of a broader initiative in biological recording across various sites in Northern Ireland. Beyond serving as a blog post, these journals will provide an ongoing log of species observations and their specific locations.

The project is kindly funded through Centre for Environmental Data and Recording (CEDaR) with a permit issued through the Northern Ireland Environment Agency (NIEA) for specific access to sample and photograph species in ASSI’s – Areas of Special Scientific Interest.

 

Methodology

  • Sampling: Field collection with nets, tank photography, and plankton nets.
  • Analysis: Lab identification using microscopy and high resolution imaging; macro photography for larger invertebrates.
  • Data: All records logged in Cedar, with expert verification, geo-tagging, supporting images and field notes
 

Expected Outcomes

  • Increased understanding of freshwater biodiversity in local water bodies.
  • Identification of indicator species for ecosystem health monitoring.
  • Participation in environmental monitoring and conservation.
  • Provision of data to support environmental policies, habitat protection, and restoration initiatives.

 

Locations

  • Brackagh Moss ASSI - Peat bog, fen and wet woodlands
  • River Cusher at Clare Glen
  • Freshwater ponds at Oxford Island, Lough Neagh basin

 

Preliminary Session - 28/06/2025

An initial session was carried out at Brackagh Moss reserve on designated ponds at the below locations:

Screenshot 2025-07-11 175014

"As this was originally a raised bog, over 300 years of turf cutting, have left this area a maze of pools, drainage channels and peat ramparts. Most of the reddish acid bog peat was removed which left an older, black, base-rich fen peat underneath. This variety in soils has resulted in an extremely varied range of flora available at this site." - NIEA

Standard pond dipping techniques were used with samples measured in specialist measuring tanks, before being transported to a tank for identification photography, and then safely returned to the original pool.  This will be the process for the future surveys on this project.

IMG-20250629-WA0020

Photography tank setup with overhead flashgun, natural background and substrate

 

Species

  • Odonata - Black Darter Sympetrum danae larva  x2
  • Hemiptera - Notonecta glauca
  • Non invertebrates - Nine Spined Stickleback Pungitius pungitius x2

 

DW6A0222-EditBlack Darter larva

DW6A0229-EditBlack Darter Larva

 

DW6A0261-EditNotonecta glauca with prey


DW6A0186-EditNine-spined Stickleback, ubiquitous at the site

 

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