The collection of birds from Mozambique at the Instituto de Investigação Científica Tropical of the University of Lisbon (Portugal)

Abstract The Instituto de Investigação Científica Tropical of the University of Lisbon, which resulted from the recent merger (in 2015) of the former state laboratory Instituto de Investigação Científica Tropical in the University of Lisbon, holds an important collection of bird skins from the Portuguese-speaking African Countries (Angola, Mozambique, São Tomé and Príncipe, Guinea Bissau and Cape Verde), gathered as a result of several scientific expeditions made during the colonial period. In this paper, the subset from Mozambique is described, which was taxonomically revised and georeferenced. It contains 1585 specimens belonging to 412 taxa, collected between 1932 and 1971, but mainly in 1948 (43% of specimens) and 1955 (30% of specimens). The collection covers all eleven provinces of the country, although areas south of the Zambezi River are better represented than those north of the river. The provinces with the highest number of specimens were Maputo, Sofala, and Gaza. Although it is a relatively small collection with a patchy coverage, it adds significantly to Global Biodiversity Information Facility, with 15% of all records available before and during the collecting period (1830–1971) being the second largest dataset for that period for Mozambique.


Introduction
Mozambique, located along the southeast coast of Africa, has a total land area of 801,590 km 2 encompassing three major biomes: the Afrotropical Highlands biome in the montane areas, the East African Coast biome in the lowlands, and the Zambezian biome represented by Brachystegia woodlands (miombo) at mid elevations (Fishpool and Evans 2001). This diversity of habitats supports a rich avifauna (Parker 1999; Ministry for the Coordination of Environmental Affairs 2009), with 671 species recorded, more than 530 of which are breeding residents (BirdLife International 2015). The country holds populations of 29 globally threatened bird species: 4 Critically Endangered, 11 Endangered, and 14 Vulnerable (IUCN 2017).
Despite the fairly high number of bird species recorded, the avifauna of Mozambique is still one of the least studied on the African continent (Borghesio et al. 2009), with several parts of the territory poorly explored, especially north of the Zambezi River (Dowsett-Lemaire 2008; Ryan and Spottiswoode 2003). The protracted Mozambican Civil War (1977-1992 was the main factor resulting in this lack of knowledge, as during that time very few expeditions or scientific studies were carried out (Parker 1999). As a result, a substantial part of current knowledge is still based on studies conducted prior to the war (Clancey 1996), represented mostly by bird skin collections kept at scientific institutions and natural history museums around the world (Frade 1950;Pinto 1953aPinto , 1953bFrade and Pinto 1954). After the war, there has been a renewed interest, albeit still modest, in the avifauna of Mozambique that has improved the knowledge of species diversity and distributions (e.g., Clancey 1996;Parker 1999;Spottiswoode et al 2008;Fishpool and Bayliss 2010). These recent studies have played a fundamental role in guiding national conservation strategies for the avifauna of Mozambique, which have targeted areas dominated by high-priority habitats like the sensitive forests that are home to many threatened species, the coastal zones where many migratory birds spend their non-breeding season, and freshwater habitats that are inhabited by many waterbirds (Borghesio et al. 2009;Moseley et al. 2012).
The present paper describes the dataset of the Mozambican bird skins held in the collection at the Instituto de Investigação Científica Tropical of the University of Lisbon (IICT-ULisboa) in Lisbon. This institution is a specialised unit of the University of Lisbon that resulted from the merging of almost all sections of the Instituto de Investigação Científica Tropical, a former state laboratory, in the University of Lisbon, in July 2015. This new unit shares the director with the National Museum of Natural History and Science of the University of Lisbon, and all the zoological and herbarium collections of IICT are in the process of being moved to the Museum. After the conclusion of relocation process, collections will remain open for the scientific community. The dataset is based on a full taxonomic revision of the bird specimens and georeferenced collection locations, accessed while in the facilities of the former IICT. This is the third in a series of studies based on the IICT-ULisboa collection, with the datasets of Angola (Monteiro et al. 2014) and São Tomé and Príncipe (Monteiro et al. 2016) already summarised. As with the previous datasets, the Mozambican dataset is freely available online on the IICT IPT provider (http://maerua.iict.pt/ipt) and on the Global Biodiversity Information Facility (GBIF) data portal (http://www.gbif.org).

Importance of biological and natural history collections
For more than two centuries, specimens from different taxa have been kept as part of natural history collections in both Natural History museums and herbariums worldwide. One of the goals was to show the outstanding biological diversity, which included very valuable and rare species, to the general public while safeguarding an interest in scientific research (e.g., Pyke and Paul 2010). These biological museums have become large repositories of compiled knowledge and reference material that can be used in several different lines of research in the field of biological sciences (Winker 2004). Currently, the information gathered on the natural collections is considered critical to deal with some biodiversity conservation matters, which includes different topics from ecology, taxonomy, biodiversity loss, biological invasions, agriculture, and public health (Graham et al. 2004).
A foremost contribution of biological collections is linked to the potential of their records being used as historical databases, since the taxonomical and distribution information it contains can cover long periods and relatively large spatial scales (Hromada et al. 2015). Moreover, when the specimens' records are combined with environmental and historical data, spatial patterns can be depicted and historical distributions can be compared with both present and future projections (e.g., Graham et al. 2004;Lavoie 2013). Each of the above data features is of extreme importance, especially in underdeveloped countries where the research means are scarce and scientific studies are limited. The use of collection records in these regions may be a cost-effective valuable resource, reducing or even eliminating the need for fieldwork in remote areas (Ponder et al. 2001).
Despite the critical value of this kind of data, the information available in many collections is still restricted as they are not easily accessible or were not even seen by specialists (Ponder et al. 2001). Therefore, it is highly recommended to facilitate the accessibility to data from as many collections as possible, which would increase the number of sources that can be reached by the scientific community (Suarez and Tsutsui 2004). One of the best ways to increase that availability is through the Internet by the digitization of the records on open access online platforms (Winker 2004). Another relevant issue that requires our attention is the declining support for taxonomic and systematic research by constituencies (e.g., Gropp 2003). This decline has already resulted in large budget cuts in many museums throughout the world, and is putting the use of biological collections at risk (Dalton 2003). As a result, it is vital to contribute to the preservation of biological collections and increase the awareness for a major visibility and access to them.

General description
The IICT-ULisboa holds a collection of 5598 African bird specimens/skins (hereafter "the collection"), mainly from Angola, Cape Verde, Guinea Bissau, Mozambique and São Tomé and Príncipe. The dataset in this paper is a subset of the collection, and contains all specimens from Mozambique, the largest subset for any country represented in the collection (hereafter "the dataset"). The dataset comprises 1585 specimens from 412 taxa, 25 orders and 79 families, which were fully taxonomically revised and georeferenced. Specimens were collected between 1932 and 1971 from 197 different locations, although 73% of all Mozambican specimens were collected in 1948 (43%) and 1955 (30%). Most of these specimens were collected during expeditions of the Missão Zoológica de Moçambique, from south of the Zambezi River, largely because these are the most accessible regions of the country. Of the many collectors, the most significant contributions were made by António da Rosa Pinto and Rui Quadros (118 specimens each) and Mussolini Fajardo (46 specimens). All of them were members of the Museu Álvaro de Castro (now Museu de História Natural, Maputo, Mozambique) and participants on the expeditions of the Missão Zoológica de Moçambique.
The collection holds representatives of five of the 30 biome-restricted species of the Afrotropical Highlands biome found in Mozambique, seven of the 24 species from the East African Coast biome, and 12 of the 26 species of the Zambezian biome (Parker 1999) (Table 1). Several species for which there are few records for the country are represented in the collection, such as Black-rumped Buttonquail (Turnix nanus (Sundevall, 1850)), African Blue Flycatcher (Elminia longicauda (Swainson, 1838)), Groundscraper Thrush (Turdus litsitsirupa (Smith A, 1836)) and Miombo Scrub Robin (Cercotrichas barbata (Hartlaub and Finsch, 1870) (e.g., GBIF.org 2017). The collection also includes some of Mozambique´s biome-restricted species of particular interest such as Anchieta's Sunbird (Anthreptes anchietae (Barboza du Bocage, 1878)) and Miombo Double-collared Sunbird (Cinnyris manoensis Reichenow, 1907) from the Zambezian biome. Both species have considerably restricted distributions in Southern Africa, being relatively uncommon in parts of their range (BirdLife 2016a, b) and the near threatened Neergaard's Sunbird (Cinnyris neergaardi Grant CHB, 1908) from the East African Coast biome. This species is mainly restricted to Mozambique and restricted area in South Africa. Its conservation status reflects concerns about the moderately small population, which may be declining owing the clearance of its native forest habitats (BirdLife 2016c).

Taxonomic coverage
The dataset includes specimens from 25 orders and 79 families. Passeriformes are by far the best-represented order (63% of the specimens), followed by Coraciiformes (5.4%) and Charadriiformes (4.9%) (Figure 1). The Cisticolidae, Ploceidae and Nectariniidae are the families with most records (110, 99 and 92 specimens, respectively).  Taxonomic ranks General spatial coverage: The collection covers all eleven provinces of Mozambique, although the distribution of the records is uneven between them ( Figure 2). From fewest to most specimens, the provinces are represented as follows: Cabo Delgado (2), Niassa (5), Nampula (5), Tete (18), Zambésia (24), Inhambane (35), Manica (39), Gaza (247), Sofala (353), and Maputo (841). The name "Maputo" refers both to Maputo and Maputo City provinces. There are 12 specimens collected from a locality that we were unable to geo-reference, and six specimens with no locality given. Coordinates: Mozambique (10°S and 27°S Latitude; 30°E and 41°E Longitude) Temporal coverage: The temporal range of the records is between 1932 and 1971 ( Figure 3). Two main peak periods are 1948 and 1955, which together represent 73% of the collected specimens and correspond to the dates of the Missão Zoológica de Moçambique´s expeditions.

Method step description:
During the ARCA project (2008)(2009)(2010), the mammal and bird collections of the IICT were initially catalogued with the use of the software Specify Workbench, and later all that information was imported to Specify version 6 (Specify Software Project 2013). At that time, there were no taxonomic experts available to check the collections, and so the imported data were directly copied out from the labels without making any corrections or taxonomic updates. In 2015-2016, the collection was revised by the first author, following the procedures of the previous works on the collection (Monteiro et al. 2014, Monteiro et al. 2016. A revision of the database was made in 2015-2016 based on the IOC Bird List v6.1 (Gill and Donsker 2014), and all the original information of each bird specimen (collector, date of collection, collection locality, and descriptions of bare parts) was double-checked to avoid transcription errors. As georeferenced location information was not available on specimen labels or associated book manuals, specimens were georeferenced according to the guidelines of Chapman and Wieczorek (2006). The geographical gazetteer Geolocate was primarily used to determine location coordinates for collection localities, with further data gleaned from sources such as Google Maps, IICT´s botanical geodata, and a series of 1:250000 maps for Mozambique. Geographical coordinates are given in decimal degrees, based on datum WGS 84. For ten records it was not possible to determine coordinates due to incomplete information.
Study extent description: The study covers all eleven provinces of Mozambique, although the southern (1123 records) and central provinces (410 records) of the country are much better represented than the northern provinces (36 records). The provinces of Maputo, Sofala, and Gaza are the best-represented.
Sampling description: All records in the database come from scientific visits carried out between 1932 and 1971. The most significant contributions were made  Geográficas e Investigações Coloniais) coordinated the first and major expedition of the zoological mission with the collaboration of the Museu Doutor Álvaro de Castro and the Centro de Investigação Científica Algodoeira that were both based on Mozambique. The aim of the six-month mission (June to November) was to evaluate the state of the country´s fauna. Two scientific teams (Brigada Entomológica and Brigada do Chefe da Missão) bringing together many different specialists surveyed the Mo-zambican territory along 12 different itineraries. In terms of ornithological results, 718 bird specimens were collected, although only 677 specimens are currently present in the collection. All bird data was published later in 1951 in two different publications of the same institution titled "Trabalhos da Missão Zoológica de Moçambique: Aves coligidas na Missão Zoologica de Moçambique" (Frade 1951) and "Trabalhos da Missão Zoológica de Moçambique: Catálogo das aves de Moçambique" (Frade and Bacelar 1951). In 1955, António Augusto da Rosa Pinto, another member of the Zoological Mission of Mozambique and the director of the Museum Doutor Álvaro de Castro, did some minor expeditions through the south region of Mozambique and Gorongosa to study the avian diversity and collect some bird specimens. The work led to a publication on the birds of Gorongosa (Pinto 1961).
Quality control description: The initial digitalized information that was directly transcribed from the specimen's labels to Specify 6 was fully revised by Miguel Monteiro. This included a taxonomic revision following the IOC Bird List version 6.1 (Gill and Donsker 2016). Additionally, all the collection localities were georeferenced using the recommended processes of Chapman and Wieczorek (2006), which included the uncertainty determination of the coordinates when no substantial information was available.