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EDP Baixo Sabor: Bat Roosts [acoustic sampling] - Ecological Monitoring Program (PME) (2012-2014)

Citation

Mota P, Vingada J V, Rodrigues P, Garrido N, Pinto N, Duro V, Oliveira F, Múrias T (2020). EDP Baixo Sabor: Bat Roosts [acoustic sampling] - Ecological Monitoring Program (PME) (2012-2014). Version 1.2. EDP. Sampling event dataset https://doi.org/10.15468/mw5xgh accessed via GBIF.org on 2025-06-24.

Description

The dataset contains records of bats (Chiroptera) collected in the lower valley of River Sabor, in the scope of the long-term Ecological Monitoring Program (PME) of the Baixo Sabor Hydroelectric Dams, promoted by EDP – Energias de Portugal, S.A. Data were collected between July 2012 and August 2014, during field visits to 12 known bat hibernation, reproduction and pre-dispersion (post-reproduction) roosts with restricted access (caves and mine entrances). These roosts were located within a 5-km radius buffer around the lower valley of River Sabor. The presence and identity of the bat species were assessed by acoustic sampling of the echo-location calls emitted in flight. The records include taxa identified at the species, genus, family or order level, as well as several potential species present in 2 acoustic “species complexes”. Due to the vulnerability of the roost locations, the precision of the geographic coordinates was degraded to 0.01, according to the recommendations of Chapman & Grafton (2008). The dataset with the original (undergraded) coordinates may be provided upon request by the resource contact from EDP, who will define the terms and conditions for its use.

Purpose

This dataset is part of a broader initiative whereby the company EDP - Energias de Portugal S.A. will make available biodiversity data collected during impact assessment and biological monitoring studies.

Sampling Description

Study Extent

The data were collected within a 5-km radius buffer around the lower valley of River Sabor Northeast Portugal), up to 90 km from the mouth, in the municipalities of Torre de Moncorvo, Alfândega da Fé, Mogadouro, Macedo de Cavaleiros, Vimioso and Bragança.

Sampling

Sampling was designed to cover all the bat roosts in the study area that could not be accessed due to security reasons, particularly mines and caves. Each point, located at the entrance of the roost, was visited at least once per season - spring (April-June), reproduction (July) and post-breeding (September-October) - in favorable conditions (temperature above 10º and absence of strong winds and rainfall). Acoustic sampling in each plot was initiated at sunset and had a fixed duration of 90 minutes. The detection of the specimens in flight was made with a bat detector (Pettersson Elektronik, D240X model), with a frequency range of 10-120 kHz. The detector was connected to an automatic digital recorder (model Sony ICD-PX312), which saved the recordings in a “Wave” format, at a frequency of 44 kHz and at an expanded mode of 10x, making them audible to the human ears while, at the same time, preserving the original acoustic characteristics. The analyses of the acoustic records were performed using the sound analysis program BatSound Pro (Pettersson Elektronik AB). This program generates graphs (oscillogram, sonogram and power spectra) where the various sound variables that allow the identification of species or complexes of species detected. The exact identification of the bat species by sound analysis is not always possible, due to problems in detectability and/or identifiability. In the context of this work, whenever it was not possible to perform the identification to the species level, the binomials, multinomials or genera to which the identification was possible were considered to be present. Thus, the presence of all species constituting these phonic groups (or “species complexes”) was considered possible.

Quality Control

All individual identifications were performed by qualified technicians

Method steps

  1. To be completed

Taxonomic Coverages

The taxonomic coverage of this dataset spans 1 class, 1 order, 2 families, 2 genera and 2 species positively identified.
  1. Chordata
    rank: phylum
  2. Mammalia
    rank: class
  3. Chiroptera
    rank: order
  4. Rhinolophidae
    rank: family
  5. Vespertilionidae
    rank: family

Geographic Coverages

Data were collected in an area of 62,500 ha corresponding to 25 5x5 km squares around the lower Sabor river affected by the Sabor Dam, and in an additional area of 30,000 ha not directly affected by the dam, encompassing a set of 12 5x5 km squares (control area), in the municipalities of Torre de Moncorvo, Mogadouro, Vimioso, Bragança and Miranda do Douro

Bibliographic Citations

  1. Chapman AD & Grafton O (2008) Guide to Best Practices for Generalising Sensitive Species-Occurrence Data. Copenhagen: GBIF Secretariat. https://doi.org/10.15468/doc-b02j-gt10 -

Contacts

Paulo Mota
originator
position: General Coordinator
BIOLINK - Consultoria Ambiental, Unipessoal, Lda
Praceta Caminho da Cruz, 9
Vila Nova de Gaia
4405-625 VN Gaia
PT
email: biolink.lda@gmail.com
José Vítor Vingada
originator
position: Scientific & fieldwork Coordinator
BIOLINK - Consultoria Ambiental, Unipessoal, Lda
Praceta Caminho da Cruz, 9
Vila Nova de Gaia
4405-625 VN Gaia
PT
Pedro Rodrigues
originator
position: Technician
BIOLINK - Consultoria Ambiental, Unipessoal, Lda
PT
Nuno Garrido
originator
position: Technician
BIOLINK - Consultoria Ambiental, Unipessoal, Lda
Nuno Pinto
originator
position: Technician
BIOLINK - Consultoria Ambiental, Unipessoal, Lda
Virgínia Duro
originator
position: Technician
BIOLINK - Consultoria Ambiental, Unipessoal, Lda
Frederico Oliveira
originator
position: Technician
BIOLINK - Consultoria Ambiental, Unipessoal, Lda
Tiago Múrias
metadata author
position: Researcher
CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto
Campus Agrário de Vairão
Vairão
4485-661 Vairão
PT
email: tdsantos@cibio.up.pt
João Madeira
administrative point of contact
position: Manager
EDP - Energias de Portugal
Av. 24 de Julho, 12, Torre Nascente, Piso 4
Lisbon
1249-300 Lisboa
PT
email: Joao.Madeira@edp.pt
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