Table Of Content© SociedadEspañoladeMalacología Iberus, 18 V\ 95-123, 2000
A
moUuscan community from coastal bioclastic bottoms in
the Strait ofGibraltar área
La comunidad de moluscos de un fondo bioclástico costero del
Estrecho de Gibraltar
José RUEDA*!, Carmen SALAS* and Serge GOFAS*
RecibidoellO-IX-1999.Aceptadoel17-XI-1999
ABSTRACT
The molluscan community of o soft bottom of bioclastic gravéis and sand has been studied
monthly over two yeors in four stations of the boy of Barbote, SW Spain at the Atlantic
entrance of the Strait of Gibraltar, between 18 and 29 m depth. Species richness, domi-
nance and frequency over the two years are recorded. Micromolluscs, less than 1 mm in
size, were also recorded from the somple ofApril 1994.
Over the tv/o yeors, 203 species of macromolluscs were found, of which 174 species
(1 15.104 individuáis) were collected olive and quantified. A total of 25 species of micro-
molluscswere determined, some ofwhich usuollyconsidered os rare species. Mostspecies
richnessvalúes range between 20 to 40 species per sample, which is comparable with, or
higherthan, the valúes reported in other studies from soft bottom communities of molluscs.
The quolitative anolysis bosed on Joccord's and Boroni-Urboni and Buser's Índices show
that three stations are significantly similar (p < 0.01), whereas the lowest similority wos
found between the stotion cióse to the horbour of Borbote and the other ones. The quanti-
totive anolysis based on the Broy and Curtis índex is biosed by the high number of indivi-
duáis of Chamelea sthatula but consistent with the quolitative Índices when thís species is
nottoken ínto account.
The main community is similar to "Biocénose des fonds meubles instables (MI)" and "Bio-
cénose des fonds detritique du large (DL)" of PÉRÉS AND Picaro (1964), but occurs shallo-
wer than in the Mediterronean. The concurrence of species from the Lusitonian, Mediterro-
nean and Mauritanian regions results in an incrementofthe total number ofspecies.
RESUMEN
Se ha estudiado la comunidad de Moluscos de fondos de grava bioclástico y areno
durante dos años en la bahía de Borbote, SW de España cerco del Estrecho de Gibraltar.
Se han elegido cuatro estaciones entre 18 y 29 metros de profundidad. Se ho determi-
nado lo riqueza especifica, la dominancia y lo frecuencia o lo largo de los dos años. Los
micromoluscos, de menos de 1 mm de tollo, se han estudiado sólo poro lo muestra de
Abril de 1994.
Se han colectado un total de 203 especies de macromoluscos o lo largo de los dos años,
de los cuales 174 especies (1 15.104 individuos) se cogieron vivos y se cuontificoron. Se
han determinado también 25 especies de micromoluscos, algunos de los cuales conside-
* Depto. BiologíaAnimal, Facultadde Ciencias, Universidadde Málaga, Campus deTeatinos s/n, E-29071-
Málaga
' Present address: Rijksinstituutvoorvisserijonderzoek (RIVO-DLO), (Centrum voor Schelpdieronderzoek),
Korringaweg, 5,Postbus77,4400ABYerseke,TheNetherlands.
95
Iberus, 18 (1), 2000
radas habitualmente como especies raras. La mayoría de los valores de la riqueza especi-
fica oscilan entre 20 y 40 especies por muestra, lo que es comparable o incluso mayor
que los valores reseñados en otros estudios para comunidades de moluscos de fondos
blandos.
Los análisis cualitativos de afinidad basados en los índices deJaccard y de Baroni-Urbani
y Buser muestran que tres estaciones son significativamente similares (p < 0,01), mientras
que la menor afinidad se encontró entre la estación próxima al puerto de Barbote y las
otras. El análisis cuantitativo de afinidad basado en el índice de Bray y Curtís esta ses-
gado por el gran número de individuos de Chamelea striatula, pero si no consideramos
dicha especie los resultados son similares a los obtenidos por índices cualitativos.
La comunidad es similar a la "Biocénose des fonds meubles instables (MI)" y "Biocénose
des fonds detritique du large (DL)" de PÉRÉS Y PlCARD (1964), pero aparece o menor pro-
fundidad que en el Mediterráneo. La comunidad de la estación próxima al puerto pre-
senta caracteres intermedios con la "Biocénose des sables fins bien calibres (SFBC)" de
PÉRÉS Y PlCARD (1964). Lo coexistencia de especies procedentes de las tres regiones Lusitó-
nica. Mediterránea yMauritánica supone un incremento de la riqueza específica.
KEYWORDS: Molluscancommunities,StraitofGibraltar, Speciesrichness,
PALABRASCLAVE: Comunidadesdemoluscos.EstrechodeGibraltar,riquezaespecífica.
INTRODUCTION
The Strait of Gibraltar is an interes- faunistic lists (Fischer-Piette, 1959;
ting área for the study of the marine Thorson, 1965; García-Gomez, 1983a;
fauna, including molluscs, due to the VANAartsen, Menkhorstand Gilten-
confluence of Atlantic and Mediterra- BERGER, 1984; Cervera, Templado,
nean waters. According to Ekman García-Gómez, Ballesleros, Ortea,
(1953), it is the meeting point of three García, Ros and Luque, 1988) and
biogeographicregions: Lusitanian, Mau- others added Information about mollus-
ritanian and Mediterranean. As a result can communities (García-Gómez,
of this, the species richness in this área 1983b; Templado, Guerra, Bedoya,
is possibly the highest of the European Moreno, Remon, Maldonado and
coasts. In addition, there is a clear pre- Ramos, 1993, Gofas, 1999) or other
sence of North African fauna in this invertebrate groups (Carballo,
zone, and there also occur some Naranjo and García-Gómez, 1997;
endemicmolluscspecies (Gofas, 1999). López de la Cuadra and García-
Some XIX century expeditions, such Gomez, 1993; Medel-Soteras, García
as "Lightning" and "Porcupine", "Cha- AND García-Gómez, 1991). Some
llenger" "Travailleur" and "Talismán" general studies have been carried out in
reported on the marine molluscs from the inner Bay of Cádiz (Arias, 1976;
the Ibero-Moroccan Gulf (see review in LÓPEZ DE LA Rosa, 1997; Drake, Arias
Salas, 1996)but were mostly concerned AND CoNRADL 1997), but these were not
with the bathyal fauna. Recently a directed to molluscan communities. A
French expedition "Balgim" (1984) and review of the decapods from expedi-
a Spanish survey "Fauna 1" (1989) tionscarried outoffthesouthernIberian
added more Information about the península and the northern coast of
malacofauna, particularly bivalves Morocco is given by García Raso
(Salas, 1996). (1996), and new records were added by
There are relatively few studies LÓPEZ DE LA Rosa, García Raso and
regarding the fauna from the Strait of RodríguezMartín (1998). The decapod
Gibraltar. Some of them reported only crustacean community from Barbate
96
RuedaETal.: Molluscan communityfrom bioclastic bottoms in theStraitofGibraltar
TableI. PhysicalcharacteristicsofthesamplingstationsinbayofBarbate.
TablaI. CaracterísticasfisicasdelasestacionesdemuestreoenlabahíadeBarbate.
Reh'n 12 Retín 16 Barra 16 Barra 10
Depth 21-22m 28-29m 28-29m 18m
coarsesand coarsesand médiumsand finesand
Typeofsediment
withbioclasts withbioclasts withbioclasts withbioclasts
Organicmattercontent 0.35-0.40% 0.40-0.60% 0.70-0.80% 0.80-1.10%
was studied by Manjón-Cabeza and (fine particles) and a higher valué of
García Raso (1998a), and the popula- percentage oforganicmatterinthe sedi-
tion structure and growth of the hermit ment than in the other stations. Hard
crab Diogenes pugilator from the same bottoms are present in the bay as flags-
área by Manjón-Cabeza and García tones between the station R12 and the
Raso (1998b). None of these previous beach(Fig. 1).
studies contained data on molluscan The Bay of Barbate is mainly
communities from infralittoral bottoms influenced by water masses from the
andtheirchangesthroughtheyear. Atlantic Ocean. Most of the flow comes
The present paper was aimed to a fromSouthPortugal, butdue to the pro-
better knowledge of molluscan commu- ximity of North África there are also
nities from bioclastic infralittoral currents of Southern origin (Rey, 1983).
bottoms in the Strait ofGibraltar, and of Atlantic water currents flow in this bay
theinfluencetheyreceivefromthediffe- in direction to the Mediterranean Sea,
rent water masses. The results have while Mediterranean water currents
been obtained from monthly samples flow below 200-250 meters deep in the
over two years of survey. These mollus- opposite direction (Vives, Santamaría
can communities are poorly documen- and Trepat, 1975) and do not affect the
tedintheSpanishcoasts, although some bay. Tidal currents can change the direc-
information from other European sta- tion of the dominant currents, produ-
tions is available in the literature cing local gyres. Water temperature
(Cabioch, 1968; Pérés and Picard, varíes from 21° C (Summer months) to
1964; Glémarec, 1969;Templadoetal., 14° C (Winter months). Water salinity
1993). valúes (around34 %o) canchange dueto
the influence of the river Barbate and
some other fresh waterreservoirs (EsTA-
ÁREAOFSTUDY blier and Margalef, 1964; Seoane-
Camba, 1965).
Samples were coUected in the bay of The mixed sediment (shell frag-
Barbate (36° 8' N- 5° 56' W), on the ments and sand) is a habitat for some
Atlantic side of the Strait of Gibraltar benthic algae, which were reported on
(Fig. 1). Foursamplestationswere selec- byFlores-Moya, Soto, Sánchez,Alta-
ted and sampled monthly throughout mirano and Conde (1995a, b) and by
two years. Sample stations were placed Conde, Flores-Moya, Soto, Altami-
on two transects, R (Retín) and B ranoandSánchez (1996).
(Barra), at different distances from the
estuary and harbour of Barbate. The
maincharacteristicsofsamplingstations MATERIALANDMETHODS
areUstedinTableI.
The station BIO is the nearest to the Samples were collected from
harbour and the estuary of Barbate October 1993 to September 1995 with a
river, with high level of sedimentation small fishing boat, by towing a rectan-
97
Iberus, 18 (1), 2000
Figure 1. Location ofthe sampling points in Bay ofBarbate. The dashed Une represents rocky
bottoms.
Figura 1. Localizacióndelospuntosdemuestreodentrodelosfondosdela bahía. Lalineadiscontinua
indicalapresenciadelajasderoca.
guiar dredge (42 cm width x 22 cm tage ofthe samples inwhich the species
mm
height), with a 0.5 mesh inner is present over the two years. Three
holding bag, for 15 minutes at a speed Índices of affinity were calculated to
of 1 knot. The dredged área for each classify the molluscancompositionfrom
samplewasapproximately 150m^. the four stations, in order to check the
Biológica! samples were sieved on different communities present in our
differentmesh sizes (10, 5, 3, and 1 mm) study área. Two of them are qualitative
in order to split into different size frac- (Jaccard, 1908; Baroni-Urbani and
tions and sort them. The smaller frac- BuSER, 1976), the other one quantitative
tions were sorted under a stereomicros- (Bray and Curtís, 1957). The quanti-
cope. MoUuscs were separated from the tative dissimilarity index (I) of Bray
rest of macrobenthos and fixed in for- AND Curtís (1957) was transformed as
maldehyde 10 % and subsequently pre- (l-I) so as to use it as a quantitative
servedinneutralizedalcohol70%. similarity index. The qualitative Índices
mm
The fraction above 1 shell size, were choseninviewofthe possibility to
representing the macrofauna, was sor- test the significance, following Real
ted quantitatively forevery sample over andVargas (1996)fortheJaccardindex
thetwoyears. Bothlivingand dead spe- and Baroni-Urbani and Buser tables
cimenswereidentified, althoughonlyli- (BARONr-URBANI AND BuSER, 1976) for
ving specimens were quantified. The ta- their own index. The affinity between
xonómica!ordinationisaccordingtoSa- stations was represented for each index
BELLI, GiANNUZZI-SaVELLI AND BEDULLI by a dendrogram, using the UPGMA
(1990) and current CLEMAM catalogue algorithm.
(www.mnhn.fr/base/malaco.html). Micromolluscs, mostly species
Species richness and dominance which have a shell size smaller than the
(percentage of individuáis to the total, bulk ofthe sediment grain, need special
for a particular species) were calculated processing to be recovered efficiently
in order to describe the community. We andthiswasdonemainlyonthesample
also calculated the frequency or percen- ofApril 1994. The fraction not retained
98
RuedaETAL.-. Molluscan communityfrom bioclasticbottoms in the StraitofGibraltar
bythe 1 mm sieve was sieved onthe 0.5 Number and percentage of species
mm
and 0.3 sieves. Then, each of these by class collected were similar in R12,
fractionswaswinnowed inseawater, so R16 and B16. In BIO, the number of
that the water movement will carry speciesby class was lower, although the
away the Hghter fraction including percentages of abundance were similar
molluscs. The water outflow was collec- to those in the other stations (Table III).
mm
ted on the 0.3 sieve, examined for The families Trochidae (12 sp., Fig. 2),
Hving micromoUuscs, and dried. The Nassariidae (9 sp., Fig. 3) andMuricidae
micromolluscs were sorted in this dry (7 sp.) were the best represented among
residue under the stereomicroscope, the gastropods; the Veneridae (13 sp.)
using a Strattman micropaleontological and Cardiidae (10 sp.) among the bival-
tray and a fine wetbrush to manipúlate ves.
them. Micromollusc data were studied Mean valúes for species richness per
apart due to an incomplete cuantifi- monthwere lowerinBIO (between 12 to
cation, onlyinthesampleofApril1994. 36) than in the other sampling points:
Sediment samples were collected R12 (17-45 species); R16 (20-49 species);
and analysed for granulometry and per- B16 (21-51 species).
centage of organic matter (% OM). The The number ofspecies ofgastropods
grain size distribution of the sediment and their abundance werehigher in R16
was determined by sieving. The mud and B16, where the sediments were cha-
fractionwas separatedby wet sieving in racterised by a mixture ofbioclasts and
a 80/^m sieve, and finally the dried sand of coarse and médium sand, respecti-
fractionwas sieved over a stacked set of vely. Total abundances ofbivalves were
grade sieves. Granulometric parameters high in R16 and BIO due to a strong set-
werecalculated accordingtothemethod tlement ofthebivalve Chamelea striatula,
of BuCHANAN (1984). Sediment for but richness for bivalves was higher in
determination of % OM was stored in the stations with mixed sediments
formaldehyde 10% just after collection. (gravéis and fine sand) than in the most
A fraction was dried at 100° C for 24 homogeneous one (BIO). In global
hours and weighted for obtaining dry terms, bivalves were more abundant
weight. Later on it was burnt to ashes thangastropodsmainlyduetotheirgre-
for 2 h at 525° C and finally weighted garious occurrence in soft bottoms. The
again. Difference of dry weight and dry dredge was not adequate for the collec-
%OM
weight after ignition determined tion of cephalopods so that a low
inthesediment. number of them were registered and
alwayssmallindividuáis(2-3cm).
The base of the ascidian Phallusia
RESULTS mammillata (Cuvier, 1815) clusters shells
and smallstoneswhichprovide amicro-
Analysis of the taxocoenosis of habitat for some species of molluscs
molluscs such as Chauvetia procerula and Ocine-
A: Macromolluscs composition and brina edwardsii which were abundant
species richness: Over the two years, a inside the holes and crevices from these
total of 203 species of macromolluscs structures. We also noted the presence
were found. Of these, 174 species (115. of small individuáis of the bivalves
104 individuáis) were collected alive Chlamys varia and Striarca láctea both
(Tables II, III). Some individuáis were attachedbybyssalthread.
only identified to genus level, either Some associations of molluscs with
because diagnostic characters are seen others organisms were found. The bi-
only onliving animáis and could notbe valve Digitaria digitaria usually suppor-
observed (e. g. Triphoridae, manyOpist- ted colonies of the hydrozoan Monobra-
hobranchs), or because they belong to chium parasitum Meresckowsky, 1877 lo-
groups where taxonomic problems are cated on the posterior part of the umbo.
notsolved (seeremarksbelow). Colonies ofanothernon determined hy-
99
Iberus, 18 (1), 2000
TableII. Speciesofmacromolluscscollectedinthesurvey.Ab:Abundance, Fr: Frequency,tt: Dead
specimen,#:Nonquantitativedata."Totar' is (Retín 12+ Retín 16+ Barra 16), excludingBarra 10.
TablaIIEspeciesdemacromoluscosrecolectadasenlosmuéstreos.Ab:Abundancia, Fr:Frecuencia, ff:Indi-
viduomuerto, #:Datosnocuantitativos. "Total"es(Retín12+Retín 16+Barra16), excluyendoBarra10.
Retín 12 Retín 16 Borro 16 Borro 10 Totol
Ab Fr Ab Fr Ab Fr Ab Fr Ab Fr
CIASSIS POLYPIACOPHORA GrayJ.E.,1821
FamilyLEPTOCHITONIDAE DalU889
iep/or/i/tonom/co/üíej (Monterosato,1879) 36 20.83 86 20.83 78 54.17 200 66.67
FamilyISCHNOCHITONIDAE DalU889
Lepidochitonacinérea (Linné,1767) 1 4.17 1 4.35 1 4.17
Lepidocbitonaconugata (Reeve,1848) 2 4.17 2 4.17
FamilyACANTHOCHITONIDAEPilsbry,1893
Acantbocb¡tonafascicular¡s[Umé,Mb7) 8 16.66 5 16.66 65 58.33 78 75.00
Acanthochitona sp. 1 4.35
CWSSISGASTROPODA Cuvier, 1797
FamilyACMAEIDAE Carpenter,1857
Acwaeavirgínea (Müller0.F.,1776) 1 4.17 5 8.33 3 8.33 9 20.83
FamilyFISSURELLIDAE Fleming, 1822
Diodoragibberula (Lamorck,1822) 1 4.17 1 4.17
Diodoragraeca (Linné,1758) 2 8.33 1 4.17 3 8.33
FamilySCISSURELLIDAE GrayJ.E.,1847
Scissurellacostata D'Orbigny,1824 2 8.33 2 8.33
FamilyTROCHIDAE Rafinesque,1815
Calliostomazizypbinum (Linné,1758) 8 12.50 8 12.50
Calliostoma sp.1 28 45.83 48 66.67 120 95.83 7 21.74 196 95.83
Calliostoma sp.2 1 4.17 3 12.50 4 16.67
Gibbulamagus (Linné,1758) 39 41.67 279 70.83 264 79.17 16 30.43 582 87.50
Gibbulafanulum (Gmelin,1791) 3 12.50 1 4.17 4 8.33 8 25.00
Gibbulaguttadauri (Philippi,1836) 167 70.83 14 25.00 11 20.83 13 21.74 192 75.00
Gibbulacineraria (Linné,1758) 1 4.17 1 4.17 2 8.33
Jujubinusdispar Curini-Galletti,1982 40 58.33 3 8.70 40 58.33
Jujubinusexaspéralos (Pennant,1777) 2 8.33 2 8.33
Jujubinusmontagui (WoodW.,1828) 12 20.83 55 50.00 68 58.33 135 79.17
Jujubinusstriatus (Linné,1758) 1 —4.17 1 4.17 2 8.33
Clanculuscruciatus (Linné,1758) tt #
FamilyTRICOLIIDAE Robertson,1985
Tricoliapullus (Linné,1758) 1 4.17 1 4.17
FamilyTURBINIDAE Rafinesque,1815
Bolmarugosa (Linné,1767) 5 12.50 5 12.50
FamilyCERITHIIDAE Férussac,1819
Biniumreticulatum (DaCosta,1778) 1 4.17 1 4.17
Í/Wümsü¿mom///o/í/m (DeRoynevalaPonzi,1854) 619 —62.50 134 20.83 73 37.50 826 75.00
ftWüms/mp/ex (Jeffreys, 1867) tt 1 —
CerUbiumvulgatum Bruguiére,1792 tt 1
FamilyTURRITELLIDAE Lovén,1847
Mesaliavaria (Kiener, 1887) 149 79.17 201 91.67 495 100 113 86.96 845 100
Turriiellacommunis Risso,1826 246 50.00 993 95.83 525 75.00 45 26.09 1764 95.83
Turritellaturbona Monterosato,1877 250 50.00 403 41.67 61 29.17 714 75.00
FamilyRISSOIDAE GrayJ.E.,1847
Rissoaguerinii Récluz,1843 2 8.33 1 4.17 3 12.50
Rissoainconspicua (Alder,1844) 1 4.17 1 4.17 2 8.33
100
RuedaETAL.: Molluscancommunityfrom bioclasticbottoms in the StraitofGibraltar
TableII. Continuation.
TablaIIContinuación.
Retín 12 Retín 16 Barro 16 Barra 10 Totol
Ab Fr Ab Fr Ab Fr Ab Fr áb Fr
—
Alvoniacimex (Linné,1758) tt — 1
Alvaniadiscors {Alian,1818) tt #
FamilyAPORRHAIIDAE GrayJ.E.,1850
Aporrbaispespelecani {Linné,1758) 104 79.17 113 58.33 61 50.00 278 83.33
FamilyCALYPTRAEIDAE Lamorck,1809
Calyptraeacbinensis {Linné,1758) 450 70.83 1297 91.67 645 87.50 104 56.52 2392 95.83
FamilyLAMELLARIIDAE D'Orbigny,1841
Lamellaría sp. 1 4.17 1 4.17 1 4.17
FamilyTRIVIIDAE Troschel,1863
Tríviaárctica {Pulteney,1789) 1 4.17 1 4.17
FamilyNATICIDAE Forbes,1838
Natkahebraea (Martyn,1784) 2 8.33 22 52.17 2 8.33
Polinicesalderi {Forbes,1838) 8 20.83 9 16.67 13 37.50 30 62.50
Polinicesguillemini (Payraudeau,1826) 6 20.83 11 25.00 3 13.04 17 33.33
Polinicesmacilenta {Philippi,1844) 11 29.17 5 12.50 10 20.83 19 56.52 26 54.17
FamilyCASSIDAE Latreille,1825
Pbalium saburon {Bruguiére,1792) tt # #
Pbalium undulatum (Gmelin,1791) tt #
FamilyRANELLIDAE GrayJ.E.,1854
Cymatium corrugatum {Lamarck,1816) 1 —4.17 2 —8.33 3 12.50
Ranellaolearia {Linné,1758) tt # — # —
Cbaronialampas (Linné, 1758) tt # #
FamilyTRIPHORIDAE GrayJ.E.,1847
Notdetermined 1 4.17 3 12.50 4 12.50
FamilyCERITHIOPSIDAE AdamsH.&A.,1853
Ceritbiopsisscalaris Locard,1892 2 8.33 1 4.17 3 12.50
Ceritbiopsistubercularis (Montagu,1803) 1 4.17 1 4.17
FamilyEPITONIIDAE BerryS.S.,1910
Epitoniumcommune {Lamarck,1822) 3 12.50 9 20.83 1 4.17 13 33.33
Epitoniumpulcbellum {BivonaAnt.,1832) 2 8.33 2 8.33
Epitonium¡olyi {Monterosoto,1878) 1 4.17 1 4.17
Cirsotremacocblea {SowerbyG.B.II,1844) 1 4.35
FamilyEULIMIDAE AdamsH.&A.,1853
Eulimaglabra {DaCosta,1778) 1 4.17 1 4.35 1 4.17
Melanellaalba {DaCosta,1778) 1 4.17 1 4.35 1 4.17
Melanella sp. 1 4.17 1 4.17
FamilyMURICIDAE Rafinesque,1815
Bolinasbrandaris {Linné,1758) 61 75.00 88 79.17 78 70.83 38 65.22 227 95.83
Hexaplextrúncalos (Linné,1758) 19 37.50 4 12.50 4 17.39 23 37.50
Muricopsiscristata (Brocchi,1814) 1 4.17 1 4.17
Ocenebraerinaceus (Linné,1758) 2 8.33 23 58.33 72 87.50 97 95.83
Ocinebrinaaciculata (Lamarck,1822) 2 8.33 1 4.17 3 12.50
Ocinebrinaedwardsii (Payraudeau,1826) 48 58.33 32 58.33 154 79.17 234 91.67
Tropbonmuricatus (Montagu,1803) 17 33.33 44 62.50 49 54.17 110 87.50
Buccinulumcorneum (Linné,1758) 1 4.17 1 4.17
Cbauvetiaprocerula Monterosoto,1889 — 27 37.50 62 45.83 89 58.33
Chauvetiabrunnea (Montagu,1803)tt #
Cbauvetia sp. tt #
Fusinuspulcbellus (Philippi,1844) 9 12.50 14 29.17 46 75.00 69 79.17
Fusinusrostratas (Olivi,1792) 2 8.33 1 4.17 3 12.50
101
)
Iberus, 18 (1), 2000
TableII. Continuadon.
TablaIIContinuación.
Retín 12 Retiñió Bárralo Barro 10 Total
Ab Fr Ab Fr Ab Fr Ab Fr Ab Fr
Nassariuselafus (Gould,1845) 13 25.00 202100 13 25.00
Nassariusheynemanni (VonMaItzan,1884) 9 12.50 1 4.17 10 16.67
Nassariusvaucheri (Pallary,1906) 3 4.17 17 39.13 3 4.17
Nassariusincrassatus (Strom,1768) 3 12.50 5 16.67 1 4.35 8 29.17
Nassariuspygmaeus (Lamorck,1822) 51 50.00 69 79.17 86 62.50 59 65.22 206 95.83
Nassariusrefículatus (Linné, 1758) 8 16.67 13 33.33 276100 21 41.67
Nassariusmulabilis (Linné,1758) 7 8.33 2431—00 7 8.33
Nassariusgranum (Lamartk,1822) ft # —
Cyclopedonovania Risso,1826ff 1
FamilyCOLUMBELLIDAE Swainson,1840
Mitrellaminar (Scacchi,1836) — 3 12.50 10 29.17 13 33.33
Mitrellabruggeni vanAartsen,Menkh.&Gittenb.,1984tt # —
Columbellarustica (Linné, 1758) tt #
FamilyCOSTELLARIIDAE MeDonoid,1860 —
l^ex;7/üm tricolor (Gmelin, 1791) tt #
FamílyCYSTISCIDAEStimpson,1865
Gibberulaepigrus (Reeve,1865) 29 45.83 13 16.67 44 65.22 42 58.33
Gibberulamiliaria (Linné,1758) 1 4.35
FamilyVOLUTIDAE Rafinesque,1815 — —
Cymbium olla (Linné,1758) tt # #
FamilyCANCELLARIDAE GrayJ.E., 1853 —
Cancellariacancellata (Linné,1758) tt #
FamilyCONIDAE Rafinesque,1815 —
Conusmediterraneus HwassinBruguiére,1792 tt #
FamilyTURRIDAE Swainson,1840
Belalaevigata (Philippi,1836) 81 54.17 143 83.33 111 70.83 118 65.22 335 95.83
Belastriolata (Risso,1826) 9 12.50 16 33.33 16 33.33 9 21.74 41 50.00
Bela sp.1 3 12.50 2 8.70 3 12.50
Bela sp.2 2 8.33 1 4.17 3 12.50
Mangeliaattenuata(Montagu,1803) 33 45.83 19 45.83 14 41.67 13 34.78 66 79.17
Haedropleuraseptangularis (Montagu,1803) 1 4.17 1 4.35 1 4.17
Crassopleuramaravignae (Bivona,1838) 2 8.33 1 4.17 3 12.50
Rapbifomaaequalis (Jeffreys,1867) 2 8.33 2 8.33
Comarmondiagracilis (Montagu,1803) 4 16.67 10 33.33 13 29.17 1 4.35 27 58.33
FamilyPYRAMIDELLIDAE GrayJ.E.,1840
Cbrysallidaterebellum (Phillippi,1844) 2 4.17 2 4.17
Eulimellaacicala (Phillippi, 1836) 2 8.33 2 8.33
Eulimellascillae (Scacchi,1835) 1 4.17 1 4.17
Odostomia acuta Jeffreys,1848 1 4.17 1 4.17
Odostomiaconoidea (Brocchi,1814) 1 4.17 1 4.17
Bracbystomiaeulimoides (Hanley,1844) 1 4.17 1 4.17
Turbonillafulvocincta (Thompson,1840) 25 45.83 14 20.83 17 37.50 9 26.09 56 70.83
Turbonillarufa (Phillippi,1836) 19 37.50 20 37.50 39 62.50
Turbonillarufescens (Forbes, 1 —4.17 7 13.04 1 4.17
Turbonillastriatula (Linné,1758) tt #
FomiIyACTEONIDAE D'Orbigny,1835
Acteontornatilis (Linné, 1758) 1 4.17 2 8.33 1 4.34 3 8.33
FamilyRETUSIDAE Thiele,1931
Retusaíruncatula (Bruguiére,1792) 2 4.17 2 4.17
Retusa mamillata (Philippi, 1836) 3 8.33 2 8.33 5 16.67
102
RuedaETAL.-. MoUuscan communityfrom bioclasticbottoms in the StraitofGibraltar
TableII. Continuation.
TablaIIContinuación.
Retín 12 Retiñió Barrólo Barra 10 Total
Ab Fr Ab Fr Ab Fr Ab Fr Ab Fr
FamilyRINGKULIDAE Philippi,1853
Ringiculaauriculata (Menard,1811) 17 20.83 20 41.67 19 37.50 27 43.48 56 70.83
FamilyBULLIDAE Lamarck, 1801
Bullastriafa Bruguiére,1792 tt
FamilyHAMINOEIDAE Pilsbry,1895
Haminoea sp. 1 4.17 1 4.17
FamilyPHILINIDAE GrayJ.E.,1850
Pbilineapella (Linné,1767) 22 8.33 4 4.35 22 8.33
Pbiline sp. 2 8.33 2 8.33
FamilyCYLICHNIDAE AdamsH.&A.,1854
Scaphanderlignarias (Linné,1758) 1 4.17 1 4.17
FamilyPLEUROBRANCHIDAE Férussac,1822
Berlhella sp. 1 4.17 1 4.17
FamilyAPLYSIIDAE Lamarck,1809
Aplysiafasciala Poiret, 1789 12 8.33 12 8.33
FamilyARCHIDORIDIDAE Bergh,1892
Archidoristuberculata (Cuvier,1804) 1 4.17 1 4.17
Archidoris sp. 2 4.17 1 4.17 3 8.33
FamilyDENDRODORIDIDAE O'Donoghue,1924
Doriopsilla sp. 3 8.33 3 8.33
CLASSIS SCAPHOPODA Bronn,1862
FamilyDENTALIIDAE Linné,1758
Dentaliuminaequicostatum Dautzenberg,1891 12 12.50 16 33.33 21 29.17 35 56.52 49 70.83
Denfoliumvulgare DaCosta, 1778 4 8.33 6 16.67 1 4.35 10 20.83
CU\SSISBIVALVIA Linné,1758
FamilyNUCULIDAE GrayJ.E.,1824
Nuculabanleyi (Winckworth,1931) 52 70.83 41 33.33 9 20.83 102 87.50
FamilyNUCULANIDAE AdamsH.&A.,1858
Nuculanapella (Linné,1767) 147 91.67 314 95.83 219 95.83 387100 680 100
FamilyARCIDAE Lamarck,1818
Ananoae Linné,1758 1 4.17 1 4.17
Anadarapolii (Mayer,1868) 10 29.17 9 25.0 19 54.17
FamilyNOETIDAE Stewart,1930
Striarcaladea (Linné,1758) 2 8.33 2 8.33 4 12.50
FamilyGLYaHAERIDIDAE Newton,1922
Glycymerisglycymeris (Linné,1758) 8 29.17 5 16.67 2 8.33 15 45.83
FamilyMYTILIDAE Rofinesque,1815
Modiolarcasubpicta (Cantraine,1835) 2 8.33 6 16.67 1 4.17 9 25.00
Modiolusbarbatus (Linné,1758) 4 8.33 4 8.33
Modiolusadríaficus (Lamarck,1819) 326 62.50 289 75.00 154 66.67 107 47.83 769 91.67
Amygdalumagglufinans (Cantraine,1835) 16 37.50 12 33.33 28 66.67
FamilyPINNIDAE Leoch,1819
Atrinafragilis (Pennant,1777) 1 4.17 1 4.17
FamilyPTERIIDAE GrayJ.E.,1847
Pieriahitando (Linné,1758) 1 4.17 1 4.17
FamilyPEaiNIDAE Rofinesque,1815
Pecténmaximus (Linné,1758) 11 12.50 8 25.00 9 25.0 7 17.39 28 41.67
103
) )
Iberus, 18 (1), 2000
TableII. Continuation.
TablaIIContinuación.
Retín 12 Retiñió Barrólo Barra 10 Total
Ab Fr Ab Fr Ab Fr Ab Fr Ab Fr
Aequipectenopercularís (Línné,1758) 5 16.67 5 16.67 10 29.17
Aequipecfencommuiatus (Monterosato,1815) 7 12.50 7 12.50
Cblamysvaría (Linné,1758) 20 29.17 63 66.67 34 54.17 117 87.50
Flexopecfenflexuosus (Poli,1795) 73 58.33 133 62.50 51 58.33 19 21.74 259 87.50
FamilyANOMIIDAE Rafinesque,1815
Anemiaephippium Linné,1758 39 37.50 162 66.67 140 62.50 15 13.04 341 87.50
FamilyLIMIDAE Rafinesque,1815
Umatulasubaurículala (Montogu,1808) 11 12.50 11 12.50
Limalima (Linné,1758) tt
FamilyLUCINIDAE Fleming,1828
Qenadecussafo (CostaO.G.,1829) tt
FamilyUNGULINIDAE AdamsH.&A.,1857
Diplodonfarofundata (Montagu,1803) 1 4.17 1 4.17
FamilyKELLIIDAE Forbes&Honley,1848
Kelliasuborbicularís (Montagu,1803) 1 4.17 1 4.17 1 4.17 3 12.50
FamilyASTARTIDAE D'Orbigny,1844
Digifaríadigitaría (Linné,1758) 597 91.67 1188 100 1067 95.83 1272 91.30 2852 100
Goodallíatríangularís (Montagu,1803) 2 8.70
FamilyCARDIIDAE Lamarck,1819
Acanthocardiaaculeata (Línné,1758) 4 12.50 2 8.33 2 8.33 1 4.35 8 20.83
Acantbocardiaechinaía (Linné,1758) 2 8.33 2 8.33
Acantbocardiamucronata (Poli,1795) 2 8.33 2 8.33
Acantbocardiatuberculata (Linné,1758) 40 41.67 2 4.17 4 12.50 280100 46 41.67
Acantbocardiaspinosa (Solonder, 1786) tt #
Parvicardium scabrum (Philippi,1844) 72 58.33 57 62.50 20 25.00 3 13.04 149 87.50
Piagiocardium papillosum (Poli,1795) 4 12.50 21 50.00 8 25.00 33 62.50
Laevicardium crassum (Gmelin,1791) 404 100 90 58.33 115 79.17 255 78.26 609 100
Laevicardium oblongum (Gmelin,1791) 1 4.17 — 1 4.17
Cerastodermaglaucum (Poiret,1789) tt #
FamilyMAGRIDAE Lamarck,1809
Mactrastuliorum (Linné,1758 29 29.17 5 4.17 3 13.04 34 29.17
Spisulasubtruncata (DoCosta,1778) 88 79.17 241 75.00 182 91.67 1013100 811 100
Spisulaelliptica (Locard, 1890} 12 8.33 2 4.17 — 14 12.50
Lutrariaangustiar Philippi,1844 tt # #
FamilyPHARIDAE AdamsH.&A.,1858
Ensisensis (Linné,1758) 4 16.67 10 17.39 4 16.67
Ensis sp. 1 4.17 1 4.17
Pbaxaspellucidus (Pennant,1777) 1 4.17 1 4.35 1 4.17
FamilyTELLINIDAE Bloínville,1814
Arcopagiabalaustina Linné,1758 1 4.35
Tollinaincarnata (Linné,1758) 2 8.70
Tellinadistorta (Poli,1791) 1 4.17 1 4.17
Tollinapygmaea Lovén,1846 1 —4.17 1 4.17
Tellinadonacina Linné,1758 tt #
FamilyDONACIDAE Fleming,1828
Donaxvenustas Poli,1795 6 20.83 124 73.91 6 20.83
Capsellavariegata (GrayJ.E.,1851 30 54.17 2 4.17 32 54.17
FamilyPSAMMOBIIDAE Fleming,1828
Garífervensis (Gmelin,1791) 3 12.50 2 8.33 5 16.67
104
