EDP Foz Tua: Bat Habitats - Complementary Studies [2010]

The dataset contains records of bats (Chiroptera) collected in the lower valley of River Tua. Data were collected in the scope of the Complementary Studies (2010-2011) of the Environmental Impact Assessment of the Foz Tua Hydroelectric Dam, promoted by EDP – Energias de Portugal, S.A. Data were collected in April 2010 during field visits to 48 points located in suitable foraging habitats for bats, within a 5-km radius buffer around the lower valley of River Tua. The presence and identity of the bat species was assessed by acoustic sampling of the echo-location calls emitted in fligth. The records include taxa identified at the species or genus level, as well as groups of species corresponding to seven acoustic “species complexes”.

Default

Identification

Alternate Identifier

54df7284-37aa-4584-8484-433100d62c6c

Publication Date
2019-03-25
Title

EDP Foz Tua: Bat Habitats - Complementary Studies [2010]

Abstract

The dataset contains records of bats (Chiroptera) collected in the lower valley of River Tua. Data were collected in the scope of the Complementary Studies (2010-2011) of the Environmental Impact Assessment of the Foz Tua Hydroelectric Dam, promoted by EDP – Energias de Portugal, S.A. Data were collected in April 2010 during field visits to 48 points located in suitable foraging habitats for bats, within a 5-km radius buffer around the lower valley of River Tua. The presence and identity of the bat species was assessed by acoustic sampling of the echo-location calls emitted in fligth. The records include taxa identified at the species or genus level, as well as groups of species corresponding to seven acoustic “species complexes”.

purpose

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

Dataset Language

ENGLISH

 
Dataset Creator
  Profico Ambiente e Ordenamento Lda - Susana Batista (General Coordinator)

Rua Alfredo da Silva, 11B

,

Lisbon

,

1300-040 Lisboa

,

PORTUGAL

Dataset Creator
  Profico Ambiente e Ordenamento Lda - Sérgio Bruno Ribeiro (Fieldwork Coordinator)

Rua Alfredo da Silva, 11B

,

Lisbon

,

1300-040 Lisboa

,
Dataset Creator
  Profico Ambiente e Ordenamento Lda - Pedro Geraldes (Technician)

Rua Alfredo da Silva, 11B

,

Lisbon

,

1300-040 Lisboa

,

PORTUGAL

Dataset Creator
  Profico Ambiente e Ordenamento Lda - Pedro Araújo (Technician)

Rua Alfredo da Silva, 11B

,

Lisbon

,

1300-040 Lisboa

,

PORTUGAL

Dataset Creator
Metadata Provider
Associated Party
Dataset Contact
  EDP - Energias de Portugal - João Madeira (Manager)

Av. 24 de Julho, 12, Torre Nascente, Piso 4

,

Lisbon

,

1249-300 Lisboa

,

PORTUGAL

Keywords (GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml)

  • occurrence

Keywords (NA)

  • Bats; acoustic sampling; reproduction; foraging habitats

Geographic Coverage

Geographic Description

The data were collected within a 5-km radius buffer around the lower valley of River Tua (Northeast Portugal), up to 45 km from the mouth, in the municipalities of Alijó, Carrazeda de Ansiães, Alijó, Mirandela and Murça.

Bounding Box

West Bounding Coordinate

-7.564

East Bounding Coordinate

-7.141

North Bounding Coordinate

41.564

South Bounding Coordinate

41.181

Temporal Coverage

Range of Dates

Begin Date

2010-04-01

End Date

2010-04-30

Taxonomic Coverage

General Taxonomic Coverage

The taxonomic coverage of this dataset spans 1 phylum, 1 class, 1 order, 4 families, 9 genus and 11 species positively identified. Additionally, a set of 9 potential species may be present in the 7 “species complexes” identified.

Taxonomic Classification

Taxonomic Rank Name

Phylum

Taxonomic Rank Value

Chordata

Taxonomic Classification

Taxonomic Rank Name

Class

Taxonomic Rank Value

Mammalia

Taxonomic Classification

Taxonomic Rank Name

Order

Taxonomic Rank Value

Chiroptera

Taxonomic Classification

Taxonomic Rank Name

Family

Taxonomic Rank Value

Vespertilionidae

Taxonomic Classification

Taxonomic Rank Name

Family

Taxonomic Rank Value

Miniopteridae

Taxonomic Classification

Taxonomic Rank Name

Family

Taxonomic Rank Value

Rhinolophidae

Taxonomic Classification

Taxonomic Rank Name

Family

Taxonomic Rank Value

Molossidae

License Information

Intellectual Rights

This work is licensed under a

Creative Commons Attribution (CC-BY) 4.0 License

.

 
 

Additional Metadata

Metadata

GBIF Metadata Block

Date Stamp

2021-11-29T09:04:25Z

Citation

Batista S, Ribeiro S B, Geraldes P, Araújo P, Múrias T (2019). EDP Foz Tua: Bat Habitats - Complementary Studies [2010]. Version 1.4. EDP - Energias de Portugal. Sampling event dataset https://doi.org/10.15468/e2yggd accessed via GBIF.org on 2021-11-29.

Logo URL
http://ipt.gbif.pt/ipt/logo.do?r=edp_sabor_herpetology_baseline
 

Project

• Project

Title

EDP Foz Tua: Bat Habitats - Complementary Studies [2010]

Personnel

Individual Name

Given Name

Susana

Surname

Batista

Role

AUTHOR

Personnel

Individual Name

Given Name

Sérgio Bruno

Surname

Ribeiro

Role

AUTHOR

Personnel

Individual Name

Given Name

Pedro

Surname

Geraldes

Role

AUTHOR

Personnel

Individual Name

Given Name

Pedro

Surname

Araújo

Role

AUTHOR

Personnel

Individual Name

Given Name

Tiago

Surname

Múrias

Role

ADMINISTRATIVE_POINT_OF_CONTACT

Abstract

The dataset contains records of bats (Chiroptera) collected in suitable foraging habitats along the lower valley of River Tua. Data were collected in the scope of the Complementary Studies (2010-2011) to the Environmental Impact Assessment of the Foz Tua Hydroelectric Dam, promoted by EDP – Energias de Portugal, S.A. Data were collected in April 2010, during field visits to 48 sampling points, stratified by habitat, within a 5-km radius around the lower valley of River Tua. The occurrence of the target taxa was documented through 427 observation events. In total, 12 taxa were identified, 11 to the species rank and 1 to the genus rank. The 7 “species complexes” identified could potentially add 9 more species to the list. The most common species (>20 records) were Pipistrellus pygmaeus (151 records), Tatarida teniotis (60 records), Pipistrellus kuhlii (34 records), Myotis daubentonii (27 records) and Eptesicus serotinus (24 records). The “species complex” Pipistrellus pipistrellus/P. pygamaeus was also relevant, with 61 records.

Funding

The work was funded by EDP - Energias de Portugal, S.A.

Study Area Description

Descriptor

The study was conducted in part of the sub-basin of river Tua, prior to the construction and subsequent flooding of the lower part of this river’s valley by the Foz-Tua Hydroelectric Dam. The sampling area covered a radius of 5 km centered in the river margins, up to a length of about 45 km from the Tua mouth.

Design Description

Description

The objective of the study was do document the usage of the potential foraging habitats for bats in the river Tua lower valley before the dam construction (river margins, woodlands, shrublands, vineyards, orchards/olive-orchards and urbanized areas), to gather quality data to support the design and implementation of mitigation and/or compensation measures.

 
 

Methods

• Method

Method Step

Description

Sampling

Study Extent

The data were collected within a 5-km radius buffer around the lower valley of River Tua (Northeast Portugal), up to 45 km from the mouth, in the municipalities of Alijó, Carrazeda de Ansiães, Mirandela and Murça.

Sampling Description

Sampling was designed to cover all suitable foraging habitats for bats in the study area. A stratified sampling procedure was used, with the number of samples allocated to each habitat in proportion to the area occupied and/or its significance for bats. A total of 48 sampling points were set in natural woodlands (7), river margins (15), shrublands (7), orchards/olive groves (5), vineyards (8) and urbanized areas (6). Each point was visited once between 8 and 22 April 2010, within ± 3 hours of sunset, and acoustic sampling was carried out for 20 (consecutive) 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 Nomad Jukebox 3, from Creative Technology Ltd.) which saved the recordings in a “Wave” format, at a frequence of 44.1 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 analysis of the sound records was made in the lab, with the software “Batsound Pro – Sound Analysis”, from Pettersson Elektronik. This software generates graphics (oscillograms, sonograms and power spectrums) that allow the identification of the detected species by comparing them with those available in reference bat sound libraries. The acoustic variables used to identify the sounds are (1) the structure of the pulse, (2) the frequency of maximum energy (kHz), (3) the range of frequencies (kHz), (4) the pulse duration (ms), (5) the interval between pulses (ms), and (6) the pulse repetition rate (Hz).



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, all records that could not be unequivocally attributed to a given species were assigned to the “species complex” that best fitted their frequency characteristics. Thus, 3 multi-specific groups sharing the same acoustic characteristics were considered: Myotis spp. (in turn subdivided in “large” Myotis – M. myotis and M. blythii – and “small” Myotis – the remaining 7 species), Pipistrellus ssp. (several complexes of different combinations of species, including Miniopterus schreibersii, whose vocalization is undistinguishable from that of Pipistrellus pygmaeus), and Nyctalus spp. (N. lasipoterus and N. noctula).

qualityControl

Description

All individual identifications were performed by qualified technicians