Biodiversity Data Journal :
Data Paper (Biosciences)
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Corresponding author: Ana I. Azevedo Neto (ana.im.neto@uac.pt)
Academic editor: Paulo Borges
Received: 11 Aug 2020 | Accepted: 01 Sep 2020 | Published: 02 Oct 2020
© 2020 Ana I. Neto, Afonso C. L. Prestes, José M. N. Azevedo, Roberto Resendes, Nuno Álvaro, Raul M. A. Neto, Ignacio Moreu
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Neto AIA, Prestes ACL, Azevedo JMN, Resendes R, Álvaro NV, Neto RMA, Moreu I (2020) Marine algal flora of Formigas Islets, Azores. Biodiversity Data Journal 8: e57510. https://doi.org/10.3897/BDJ.8.e57510
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The oldest reference to marine life in Formigas Islets (oriental group of the Azores archipelago) goes back to the 16th century. Nevertheless, their macroalgal flora is poorly known, the published information mainly resulting from occasional collections of sporadic visitors. To overcome this and contribute to the knowledge of Azorean macroalgal flora at both local and regional scales, a thorough investigation was conducted in 1990 and 1991 under two expeditions promoted by the Marine Biology Research Group of the Department of Biology, University of the Azores. Collections and presence data recordings were undertaken at the littoral and sublittoral levels down to approximately 40 m, in an area of approximately 0.04 km2. This paper lists the taxonomic records and provides information regarding each species’ ecology and occurrence on the Islets’ littoral.
A total of 320 specimens are registered (including taxa identified only at generic level) belonging to 90 taxa of macroalgae, from which 70 were diagnosed at species level. The confirmed species comprise 39 Rhodophyta, 12 Chlorophyta and 19 Ochrophyta (Phaeophyceae), distributed in 22 orders (13 Rhodophyta, 3 Chlorophyta and 6 Ochrophyta) and 37 families (24 Rhodophyta, 6 Chlorophyta and 7 Ochrophyta). Sixty-one species represent new records for the Islets, from which Botryocladia macaronesica Afonso-Carrillo, Sobrino, Tittley & Neto and Laurencia viridis Gil-Rodriguez & Haroun are Macaronesian endemisms. Most species are native to the Azores, but six have an uncertain origin and four are introduced (the Rhodophyta Asparagopsis armata Harvey; Laurencia dendroidea J.Agardh; Neoizziella divaricata (C.K.Tseng) S.-M.Lin, S.-Y.Yang & Huisman and the Ochrophyta Hydroclathrus tilesii (Endlicher) Santiañez & M.J.Wynne).
Macroalgae, new records, Azores, Formigas Islets, endemism, native, introduced, uncertain, occurrence data.
The Formigas Islets are located about 31 km NE of Santa Maria Island and 55 km SE of São Miguel Island (oriental group of Azorean archipelago, approximately
The oldest reference to life in Formigas Islets consists of descriptions of its marine fauna in the 16th century manuscript "Saudades da terra", written by the naturalist clergyman Gaspar Frutuoso. Subsequently, these Islets were occasionally studied in sporadic visits by researchers, the first reference to the marine macroalgae being that of
This paper, aimed at contributing to a better understanding of the seaweed flora of the Azores archipelago, lists the macroalgae recorded on surveys undertaken on the Formigas Islets (Azores, eastern group) and presents general information for each taxon’s occurrence on the Islets’ littoral, thus addressing several biodiversity shortfalls (see
Marine algal (seaweed) flora of Formigas Islets, Azores
Sampling took place in the summers of 1990 and 1991 under the coordination of Ana I. Neto. Main collectors were Ana I. Neto, Bruno Brum, Carlos Rodrigues, Heather Baldwin, João Brum, José M. N. Azevedo, José Pedro Viegas and Luís Resendes.
Ana I. Neto and Heather Baldwin were responsible for the species identification.
Voucher specimen management was mainly undertaken by Afonso Prestes, Ana I. Neto, Eunice Nogueira, Natália Cabral and Roberto Resendes.
Located in the eastern group of the Azores archipelago, the Formigas Islets (
The Formigas Islets are located in the NW part of the bank. With a N-S arrangement, they have a total length of about 165 m and width of 80 m, with an area of compact rocks in the southern part and one of large blocks in the North (Fig.
As in the remaining archipelago, the climate is temperate oceanic with persistent winds, regular and abundant rainfall and high levels of relative humidity, mainly during winter and autumn (
The intertidal zone is narrow and mostly dominated by animals (e.g. gastropods, chthamalid barnacles and decapods) and algal turfs (mostly composed by various species of Ceramium spp. and Gymnogongrus spp.) (Fig.
The macroalgae, referred to in this paper, were collected during field studies at littoral and sublittoral levels down to approximately 40 m on the Formigas Islets, over an area of 0.04 km2 (Table
Location N0 | Location ID | Municipality | Locality | Latitude / Longitude | geodeticDatum | Littoral zone |
1 | FOR_FOR_PNI | Formigas | Ponta norte do ilhéu |
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WGS294 | Intertidal |
3 | FOR_FOR_AVI1 | Formigas | À volta do ilhéu 1 |
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WGS84 | Subtidal |
4 | FOR_FOR_AVI2 | Formigas | À volta do ilhéu 2 |
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WGS84 | Subtidal |
2 | FOR_FOR_AVI3 | Formigas | À volta do ilhéu 3 |
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WGS84 | Intertidal |
5 | FOR_FOR_II | Formigas | No intertidal do ilhéu |
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WGS84 | Intertidal |
6 | FOR_FOR_II | Formigas | No intertidal do ilhéu |
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WGS84 | Subtidal |
7 | FOR_FOR_LOI | Formigas | Lado oeste do ilhéu |
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WGS84 | Subtidal |
8 | FOR_FOR_LOIba | Formigas | Lado oeste do ilhéu | Destroço de um barco afundado |
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WGS84 | Subtidal |
This study was mainly financed by the following projects/scientific expeditions:
Collections were made at littoral and sublittoral levels down to about 40 m around Formigas Islets over a total area of approximately 0.04 km2 (Fig.
Intertidal collections were made at low tide by walking over the shore. Subtidal collections were made by scuba diving. In each sampling location, one or two specimens of all different species found were scraped into labelled bags (Fig.
Each sampled taxon was investigated by trained taxonomists with the help of keys and floras. This involved morphological and anatomical examination by eye or under the dissecting and compound microscopes of an entire specimen or slide preparation. In difficult cases, specimens were sent to experts for identification.
In the laboratory, the specimens were sorted and studied following standard procedures used in macroalgae identification.
Species identification was based on morphological and anatomical characters and reproductive structures. For small and simple thalli, this required the observation of the entire thallus with the naked eye and/or using dissecting and compound microscopes. For larger and more complex algae, the investigation of thalli anatomy required histological work to obtain longitudinal and transverse sections needed for the observation of cells, reproductive structures and other diagnostic characters.
Due to the mixed nature of the Azorean macroalgal flora, relevant floras from the Atlantic and western Mediterranean were used for the species identification (e.g.
For more critical and taxonomically-difficult taxa, specimens were taken to the herbarium of the Natural History Museum (London) for comparison with collections there.
A reference collection was made for all specimens collected by giving them a herbarium code number and depositing them at the AZB Herbarium Ruy Telles Palhinha, University of Azores. Depending on the species and on further research planned, different types of collections were made, namely (i) liquid collections using 5% buffered formaldehyde seawater and then replacing it by the fixing agent Kew (
Nomenclatural and taxonomic status used here follow Algaebase (
Formigas Islets, Azores, Macaronesia, Portugal (approximately
37.269 and 37.276 Latitude; -24.783 and -24.778 Longitude.
All macroalgae were identified to genus or species level. In total, 90 taxa were identified comprising 71 confirmed species, belonging to 22 orders and 37 families, distributed by the phyla Rhodophyta (13 orders and 24 families), Chlorophyta (3 orders and 6 families) and Ochrophyta (6 orders and 7 families) (see Tables
Macroalgae species from Formigas Islets, with information on their relative abundance, origin and status.
Phylum |
Species (Accepted Name) |
Number of records |
Establishment Means |
Occurrence Remarks |
Rhodophyta |
Amphiroa beauvoisii J.V.Lamouroux |
1 |
Native |
New record |
Rhodophyta |
Asparagopsis armata Harvey |
12 |
Introduced |
New record |
Rhodophyta |
Bornetia secundiflora (J.Agardh) Thuret |
4 |
Native |
New record |
Rhodophyta |
Botryocladia macaronesica Afonso-Carrillo, Sobrino, Tittley & Neto |
2 |
Macaronesian endemism |
New record |
Rhodophyta |
Callithamnion corymbosum (J.E.Smith) Lyngbye |
1 |
Native |
New record |
Rhodophyta |
Callithamnion tetragonum (Withering) S.F.Gray |
1 |
Native |
New record |
Rhodophyta |
Centroceras clavulatum (C.Agardh) Montagne |
1 |
Native |
New record |
Rhodophyta |
Ceramium ciliatum (J.Ellis) Ducluzeau |
2 |
Native |
New record |
Rhodophyta |
Ceramium deslongchampsii Chauvin ex Duby |
4 |
Native |
New record |
Rhodophyta |
Ceramium diaphanum (Lightfoot) Roth |
4 |
Native |
New record |
Rhodophyta |
Ceramium gaditanum (Clemente) Cremades |
8 |
Uncertain |
New record |
Rhodophyta |
Chondria capillaris (Hudson) M.J.Wynne |
1 |
Native |
New record |
Rhodophyta |
Chondria dasyphylla (Woodward) C.Agardh |
4 |
Uncertain |
New record |
Rhodophyta |
Cryptopleura ramosa (Hudson) L.Newton |
12 |
Native |
New record |
Rhodophyta |
Dasya ocellata (Grateloup) Harvey |
3 |
Native |
New record |
Rhodophyta |
Digenea simplex (Wulfen) C.Agardh |
4 |
Native |
|
Rhodophyta |
Dudresnaya verticillata (Withering) Le Jolis |
1 |
Native |
New record |
Rhodophyta |
Gelidium spinosum (S.G.Gmelin) P.C.Silva |
1 |
Native |
New record |
Rhodophyta |
Gymnogongrus crenulatus (Turner) J.Agardh |
3 |
Native |
New record |
Rhodophyta |
Gymnogongrus griffithsiae (Turner) C.Martius |
2 |
Native |
New record |
Rhodophyta |
Halurus equisetifolius (Lightfoot) Kützing |
1 |
Native |
|
Rhodophyta |
Haraldiophyllum bonnemaisonii (Kylin) A.D.Zinova |
2 |
Native |
New record |
Rhodophyta |
Itonoa marginifera (J.Agardh) Masuda & Guiry |
1 |
Native |
New record |
Rhodophyta |
Laurencia dendroidea J.Agardh |
6 |
Introduced |
New record |
Rhodophyta |
Laurencia viridis Gil-Rodriguez & Haroun |
3 |
Macaronesian endemism |
New record |
Rhodophyta |
Leptosiphonia brodiei (Dillwyn) A.M.Savoie & G.W.Saunders |
1 |
Uncertain |
New record |
Rhodophyta |
Lophosiphonia obscura (C.Agardh) Falkenberg |
1 |
Native |
New record |
Rhodophyta |
Meredithia microphylla (J.G.Arardh) J.G.Agardh |
8 |
Native |
New record |
Rhodophyta |
Nemalion elminthoides (Velley) Batters |
6 |
Native |
New record |
Rhodophyta |
Neoizziella divaricata (C.K.Tseng) S.-M.Lin, S.-Y.Yang & Huisman |
2 |
Introduced |
New record |
Rhodophyta |
Peyssonnelia squamaria (S.G.Gmelin) Decaisne ex J.Agardh |
1 |
Native |
New record |
Rhodophyta |
Platoma cyclocolpum (Montagne) F.Schmitz |
4 |
Native |
New record |
Rhodophyta |
Plocamium cartilagineum (Linnaeus) P.S.Dixon |
11 |
Native |
New record |
Rhodophyta |
Polysiphonia atlantica Kapraun & J.N.Norris |
2 |
Native |
New record |
Rhodophyta |
Pterocladiella capillacea (S.G.Gmelin) Santelices & Hommersand |
9 |
Native |
New record |
Rhodophyta |
Pyropia leucosticta (Thuret) Neefus & J.Brodie |
1 |
Native |
New record |
Rhodophyta |
Rhodymenia holmesii Ardissone |
3 |
Native |
New record |
Rhodophyta |
Scinaia furcellata (Turner) J.Agardh |
7 |
Native |
New record |
Rhodophyta |
Vertebrata fucoides (Hudson) Kuntze |
1 |
Uncertain |
New record |
Chlorophyta |
Bryopsis cupressina J.V.Lamouroux |
2 |
Native |
New record |
Chlorophyta |
Bryopsis hypnoides J.V.Lamouroux |
2 |
Native |
New record |
Chlorophyta |
Chaetomorpha linum (O.F.Müller) Kützing |
4 |
Native |
New record |
Chlorophyta |
Cladophora albida (Nees) Kützing |
2 |
Native |
New record |
Chlorophyta |
Cladophora coelothrix Kützing |
1 |
Native |
New record |
Chlorophyta |
Cladophora laetevirens (Dillwyn) Kützing |
4 |
Uncertain |
New record |
Chlorophyta |
Codium adhaerens C.Agardh |
1 |
Native |
New record |
Chlorophyta |
Phyllodictyon anastomosans (Harvey) Kraft & M.J.Wynne |
1 |
Native |
|
Chlorophyta |
Ulva compressa Linnaeus |
1 |
Native |
New record |
Chlorophyta |
Ulva linza Linnaeus |
2 |
Native |
New record |
Chlorophyta |
Ulva rigida C.Agardh |
6 |
Native |
New record |
Chlorophyta |
Valonia utricularis (Roth) C.Agardh |
3 |
Native |
New record |
Ochrophyta |
Canistrocarpus cervicornis (Kützing) J.C.De Paula & De Clerck |
1 |
Native |
New record |
Ochrophyta |
Carpomitra costata (Stackhouse) Batters |
6 |
Native |
|
Ochrophyta |
Colpomenia sinuosa (Mertens ex Roth) Derbès & Solier |
7 |
Native |
New record |
Ochrophyta |
Cystoseira compressa (Esper) Gerloff & Nizamuddin |
8 |
Native |
New record |
Ochrophyta |
Cystoseira humilis Schousboe ex Kützing |
1 |
Native |
New record |
Ochrophyta |
Dictyopteris polypodioides (DC.) J.V.Lamouroux |
2 |
Native |
|
Ochrophyta |
Dictyota bartayresiana J.V.Lamouroux |
9 |
Native |
New record |
Ochrophyta |
Dictyota dichotoma (Hudson) J.V.Lamouroux |
8 |
Native |
New record |
Ochrophyta |
Dictyota dichotoma var. intricata (C.Agardh) Greville |
5 |
Native |
New record |
Ochrophyta |
Ectocarpus siliculosus (Dillwyn) Lyngberg |
6 |
Uncertain |
New record |
Ochrophyta |
Halopteris filicina (Grateloup) Kützing |
7 |
Native |
|
Ochrophyta |
Halopteris scoparia (Linnaeus) Sauvageau |
3 |
Native |
New record |
Ochrophyta |
Hydroclathrus tilesii (Endlicher) Santiañez & M.J.Wynne |
1 |
Introduced |
New record |
Ochrophyta |
Laminaria ochroleuca Bachelot de la Pylaie |
7 |
Native |
|
Ochrophyta |
Padina pavonica (Linnaeus) Thivy |
2 |
Native |
New record |
Ochrophyta |
Sargassum cymosum C.Agardh |
4 |
Native |
New record |
Ochrophyta |
Sargassum furcatum Kützing |
6 |
Native |
New record |
Ochrophyta |
Treptacantha abies-marina (S.G.Gmelin) Kützing |
9 |
Native |
|
Ochrophyta |
Zonaria tournefortii (J.V.Lamouroux) Montagne |
13 |
Native |
Main taxonomic figures with information on the species origin and status.
Phyllum |
Order |
Family |
Specimens Number |
Total taxa |
Total species |
Native |
Intro-duced |
Uncertain |
Macaro-nesian endemism |
New record |
Rhodophyta |
13 |
24 |
169 |
54 |
39 |
30 |
3 |
4 |
2 |
37 |
Chlorophyta |
3 |
6 |
33 |
14 |
12 |
11 |
1 |
11 |
||
Ochrophyta |
6 |
7 |
118 |
22 |
19 |
17 |
1 |
1 |
13 |
|
Total |
22 |
37 |
320 |
90 |
70 |
58 |
4 |
6 |
2 |
61 |
Rank | Scientific Name | Common Name |
---|---|---|
phylum | Rhodophyta | Red algae |
phylum | Chlorophyta | Green algae |
phylum | Ochrophyta | Brown algae |
The sampling was performed in the summers of 1990 and 1991.
This data paper presents data from macroalgae surveys developed in Formigas Islets in 1990 and 1991 (
Column label | Column description |
---|---|
Table of Sampling Events | Table with sampling events data (beginning of table) |
eventID | Identifier of the event, unique for the dataset |
country | Country of the sampling site |
countryCode | Code of the country where the event occurred |
stateProvince | Name of the region |
island | Name of the island |
municipality | Name of the municipality |
locality | Name of the locality |
locationID | Identifier of the location |
decimalLatitude | The geographic latitude of the sampling site |
decimalLongitude | The geographic longitude of the sampling site |
geodeticDatum | The spatial reference system upon which the geographic coordinates are based |
coordinateUncertaintyInMetres | The horizontal distance (in metres) from the given decimalLatitude and decimalLongitude describing the smallest circle containing the whole of the Location |
eventDate | Time interval when the event occurred |
year | The year of the event |
samplingProtocol | Sampling method used during an event |
locationRemarks | Zonation level |
minimumDepthInMetres | The minimum depth in metres where the specimen was found |
maximumDepthInMetres | The maximum depth in metres where the specimen was found |
eventRemarks | Notes about the event |
Table of Species Occurrence | Table with species occurrence data (beginning of new table) |
occurrenceID | Identifier of the record, coded as a global unique identifier |
institutionID | The identifier for the institution having custody of the object or information referred to in the record |
institutionCode | The acronym of the institution having custody of the object or information referred to in the record |
collectionID | An identifier of the collection to which the record belongs |
collectionCode | The name of the collection from which the record was derived |
datasetName | The name identifying the dataset from which the record was derived |
eventID | Identifier of the event, unique for the dataset |
kingdom | Kingdom name |
phylum | Phylum name |
class | Class name |
order | Order name |
family | Family name |
genus | Genus name |
specificEpithet | The name of the first or species epithet of the scientificName |
infraspecificEpithet | The name of the lowest or terminal infraspecific epithet of the scientificName, excluding any rank designation |
acceptedNameUsage | The specimen accepted name, with authorship |
previousIdentifications | Previous name of the specimen, with authorship |
scientificName | The name without authorship applied on the first identification of the specimen |
basisOfRecord | The specific nature of the data record |
habitat | Description of the habitat where the specimen was found |
recordedBy | Person(s) responsible for sampling |
catalogNumber | Identifying code for a unique sample lot in a biological collection |
identifiedBy | Person(s) responsible for taxa identification |
type | The nature of the resource |
preparations | The preservation method used for the specimen |
establishmentMeans | The establishment status of the organism in the study region |
occurrenceRemarks | New record status assignment |
licence | Reference to the licence under which the record is published |
This paper is based on the 320 specimens of macroalgae collected from the Formigas Islets. Ninety taxa are listed (54 Rhodophyta, 14 Chlorophyta and 22 Ochrophyta) of which 70 are confirmed species and 20 taxa are identified only to genus level. The confirmed species (Tables
Many species were only sporadically observed on the Islets, but seven were commonly found, namely: the Rhodophyta Asparagopsis armata Harvey, Cryptopleura ramosa (Hudson) L.Newton, Plocamium cartilagineum (Linnaeus) P.S.Dixon and Pterocladiella capillacea (S.G.Gmelin) Santelices & Hommersand; and the Ochrophyta Dictyota bartayresiana J.V.Lamouroux, Treptacantha abies-marina (S.G.Gmelin) Kützing and Zonaria tournefortii (J.V.Lamouroux) Montagne.
A mismatch regarding the GBIF backbone taxonomy of some of the macroalgae species names was identified as detailed in Suppl. material
This research was mainly supported by the projects Expeditions “SANTA MARIA and FORMIGAS/90” and “FORMIGAS/91” and lately by the project “ACORES-01-0145-FEDER-000072” funded the Operational Programme Azores 2020 (85% ERDF and 15% regional funds). We are grateful to the Department of Biology of University of the Azores and to the Portuguese Navy for their logistics support during both Expeditions. Thanks are due to the participants who integrated the two Expeditions (Ana Cristina Costa, Bruno Brum, Carlos Rodrigues, Emanuel Pacheco, Heather Baldwin, Helena Sousa, Joana, João Brum, José Pedro Viegas, Luís Resendes, Pedro Cordeiro, Pedro Rodrigues, Philip Heemstra and Tomás Vieira). Afonso Prestes was supported by a PhD grant (M3.1.a/F/083/2015) awarded by Fundo Regional da Ciência e Tecnologia (FRCT).
GBIF does not have the more actualised nomenclature for some of the macroalgae species names. Therefore, the matching tools of its platform were applied to the species list, as required by Pensoft's data auditor, to identify the problematic taxonomic situations. The resulting file (DP-FOR-id_14155_normalized-redz.csv) is included here, since the names will not be immediately updated in the GBIF Taxonomic Backbone. A request was already sent to GBIF helpdesk to resolve this situation.