Table 1 Algae species found in urchin barrens studied in 12 sites around Tenerife Island, including the relative frequency (%) per sector

Crustose

 Hydrolithon farinosum (Lamouroux) Penrose et Chamberlain

95

90

85

 Hydrolithon samoënse (Foslie) Keats et Chamberlain

60

60

82.5

 Pseudolithoderma adriaticum (Hauck) Verlaque

57.5

40

30

 Neogoniolithon orotavicum (Foslie) Lemoine

20

57.5

15

 Neogoniolithon hirtum (Lemoine) Afonso-Carrillo

22.5

10

22.5

 Hydrolithon onkodes (Heydrich) Penrose et Woelkerling

5

5

42.5

 Titanoderma polycephalum (Foslie) Woelkerling, Chamberlain et Silva

2.5

2.5

20

 Peyssonnelia dubyi P. et H. Crouan

17.5

 Phymatolithon lenormandii (Areschoug) Adey

7.5

5

2.5

 Lithophyllum vickersiae Lemoine

2.5

7.5

 Peyssonnelia rubra (Greville) J. Agardh

5

 Mesophyllum lichenoides (Ellis) Lemoine

2.5

 Pneophyllum fragile Kützing

2.5

Cyanophytes

 Microcoleus lyngbyaceus (Kützing) P. et H. Crouan ex Gomont

60

45

40

 Calothrix crustacea Thuret ex Bornet et Flahault

15

20

12.5

 Schizothrix calcicola (C. Agardh) Gomont ex Gomont

10

17.5

15

 Oscillatoria princeps Vaucher ex Gomont

15

5

15

 Schizothrix mexicana Gomont

0

15

12.5

 Anacystis dimidiata (Kützing) Drouet et Daily

7.5

7.5

5

 Oscillatoria lutea C. Agardh ex Gomont

5

7.5

 Spirulina subsalsa Oersted ex Gomont

5

2.5

2.5

 Oscillatoria submembranacea Ardissone et Straff ex Gomont

5

2.5

 Entophysalis deusta (Meneghini) Drouet et Daily

2.5

 Schizothrix arenaria (Berkeley) Gomont

2.5

Filamentous and small macrophytes

 Jania adhaerens Lamouroux

80

85

77.5

 Pseudochlorodesmis furcellata (Zanardini) Børgesen

77.5

75

75

 Herposiphonia secunda (C. Agardh) Ambronn

70

60

52.5

 Sphacelaria cirrosa (Roth) C. Agardh

72.5

50

45

 Asparagopsis taxiformis (sporophyte) (Delile) Trevisan

47.5

47.5

50

 Gelidium pusillum (Stackhouse) Le Jolis

25

37.5

57.5

 Gelidiopsis intricata (C. Agardh) Vickers

47.5

47.5

15

 Womersleyella setacea (Hollenberg) Norris

40

30

25

 Anotrichium tenue (C. Agardh) Nägeli

32.5

15

37.5

 Ceramium flaccidum (Kützing) Ardissone

25

30

27.5

 Ptilothamnion speluncarum (Collins et Hervey) Ballantine et Wynne

30

22.5

30

 Sphacelaria sp.

15

25

42.5

 Hypoglossum hypoglossoides (Stackhouse) Collins et Hervey

5

12.5

57.5

 Ceramium tenerrimum (Martens) Okamura

12.5

17.5

40

 Heterosiphonia crispella (C. Agardh) Wynne

12.5

15

35

 Cladophora laetevirens (Dillwyn) Kützing

20

12.5

30

 Callithamniella tingitana (Schousboe ex Bornet) Feldmann-Mazoyer

2.5

5

50

 Dasya hutchinsiae Harvey

10

12.5

27.5

 Laurencia spp.

10

15

17.5

 Apoglossum ruscifolium (Turner) J. Agardh

7.5

27.5

 Griffithsia phyllamphora J. Agardh

5

30

 Polysiphonia funebris De Notaris

2.5

5

25

 Pseudotetraspora marina Wille

12.5

15

2.5

 Spermothamnion flabellatum Bornet

12.5

2.5

10

 Ochlochaete hystrix Thwaites ex Harvey

10

7.5

7.5

 Chaetomorpha aerea (Dillwyn) Kützing

15

7.5

 Acrochaetium gracile Børgesen

2.5

7.5

10

 Crouania attenuata (C. Agardh) J. Agardh

2.5

12.5

5

 Erythrotrichia carnea (Dillwyn) J. Agardh

7.5

5

7.5

 Grallatoria reptans Howe

5

12.5

 Ceramium codii (Richards) Mazoyer

2.5

5

7.5

 Phaeophila dendroides (P. et H. Crouan) Batters

5

5

5

 Centroceras clavulatum (C. Agardh) Montagne

7.5

5

 Polysiphonia sp.

2.5

5

5

 Taenioma nanum (Kützing) Papenfuss

12.5

 Blastophysa rhizopus Reinke

5

5

2.5

 Ernodesmis verticillata (Kützing) Børgesen

10

2.5

 Polysiphonia ferulacea Suhr ex J. Agardh

2.5

7.5

 Spongoclonium caribaeum (Børgesen) Wynne

5

5

 Derbesia tenuissima (Moris et De Notaris) P. et H. Crouan

10

 Acrochaetium daviesii (Dillwyn) Nägeli

2.5

5

 Amphiroa fragilissima (Linnaeus) Lamouroux

2.5

5

 Champia parvula (C. Agardh) Harvey

7.5

 Diplothamnion jolyi Hoek

5

2.5

 Platysiphonia caribaea Ballantine et Wynne

7.5

 Polysiphonia flocculosa (C. Agardh) Kützing

5

2.5

 Hincksia mitchelliae (Harvey) Silva

7.5

 Sphacelaria rigidula Kützing

2.5

2.5

2.5

 Myrionema sp.

2.5

5

 Feldmannia irregularis (Kützing) Hamel

5

2.5

 Anotrichium furcellatum (J. Agardh) Baldock

2.5

2.5

 Ceramium diaphanum (Lightfoot) Roth

5

 Cottoniella filamentosa (Howe) Børgesen

5

 Dasya crouaniana J. Agardh

5

 Neosiphonia sphaerocarpa (Børgesen) Kim et Lee

5

 Wrangelia argus (Montagne) Montagne

5

 Sphacelaria plumula Zanardini

2.5

2.5

 Bryopsis plumosa (Hudson) C. Agardh

2.5

2.5

 Acrosorium ciliolatum (Harvey) Kylin

2.5

 Antithamnionella boergesenii (Cormaci et Furnari) Athanasiadis

2.5

 Aphanocladia stichidiosa (Funk) Ardré

2.5

 Botryocladia boergesenii Feldmann

2.5

 Callithamnion tetragonum (Withering) Gray

2.5

 Erythrocladia irregularis Rosenvinge

2.5

 Nitophyllum punctatum (Stackhouse) Greville

2.5

 Polysiphonia scopulorum Harvey

2.5

 Vickersia baccata (J. Agardh) Karsakoff emend Børgesen

2.5

 Nemacystus flexuosus (C. Agardh) Kylin

2.5

 Feldmannia globifera (Kützing) Hamel

2.5

 Parvocaulis parvulus (Solms-Laubach) Berger et al.

2.5

 Parvocaulis polyphysoides (P. et H. Crouan) Berger et al.

2.5

 Acrochaete geniculata (Gardner) O’Kelly

2.5

 Anadyomene saldanhae Joly et Oliveira

2.5

 Ulvella setchellii Dangeard

2.5

Upright macrophytes

 Lobophora variegata (Lamouroux) Oliveira

60

55

67.5

 Dictyota sp.

17.5

22.5

27.5

 Dictyota pfaffii Schnetter

12.5

15

25

 Haliptilon virgatum (Zanardini) Garbary et Johansen

2.5

5

12.5

 Sargassum sp.

12.5

 Padina pavonica (Linnaeus) Thivy in Taylor

10

 Ulva sp.

5

2.5

2.5

 Canistrocarpus cervicornis (Kützing) De Clerck

5

2.5

 Cystoseira compressa (Esper) Gerloff et Nizamuddin

5

2.5

 Stypopodium zonale (Lamouroux) Papenfuss

7.5

 Halopteris scoparia (Linnaeus) Sauvageau

5

 Asparagopsis taxiformis (Delile) Trevisan

5

 Dictyota fasciola (Roth) Lamouroux

2.5

 Colpomenia sinuosa (Roth) Derbès et Solier

2.5

 Liagora tetrasporifera Børgesen

2.5