Dull adnabod

Dynodydd

NRW_DS115894

Teitl Amgen

Laith Metadata

English

Datganiad

Sites were surveyed in October 2013, April 2014 and October 2014 using a combination of hand-searching and mechanical sampling techniques. A total of 136 person-hours was devoted to searching potentially suitable habitats across Dyfi NNR. A modified leaf blower was used on one survey occasion to assist sampling.

A single adult female Agroeca dentigera was recorded on 3 October 2014 within an area of dense marram grass in the dune system. Surveys of other potentially suitable habitats did not record the species. Although its habitat preferences remain poorly understood, the available evidence suggests that A. dentigera is associated with dense marram-dominated dune habitat at Dyfi NNR.

In addition to A. dentigera, 94 spider species were recorded, including Philodromus fallax and Ceratinopsis romana. Eleven spider species and a further sixteen non-spider invertebrate species are thought to represent new records for Dyfi NNR. An additional 47 non-spider invertebrate species were also recorded during the surveys.

The considerable survey effort required to locate a single specimen suggests that A. dentigera occurs at very low densities, making the development of effective monitoring protocols challenging. Some voucher specimens have been retained and are held in the collections of Liverpool Museum. The data were provided to NRW for inclusion within Recorder 6, with data transfer underway at the time of reporting.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)

2015-03-31

 

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System Cyfeirio Gofodol

 

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