Abstract
During the past 5 decades, the large-sized biota inhabiting dark marine caves has attracted the attention of many marine biologists; in contrast, studies concerning the meiofaunal organisms of these peculiar biotopes remain scanty and mostly with a taxonomic aim. In this study, the nature and abundance of meiofaunal taxa living in a Mediterranean, semi-submerged sea cave was surveyed in relation to distance from the entrance and over two different seasonal periods. Particular attention was paid to the Gastrotricha taxocene. Research was carried out in a cave along the Ionian coast of Apulia (southern Italy), the “Grotta Piccola del Ciolo” which opens for approximately 120 m on the north-eastern side of a shallow fjord and has a bottom blanketed by fine to very fine sand, occasionally rich in detritus. Quantitative samples in four replicates were collected by SCUBA diving, in November 2000 and June 2001, coring the sediment with a hand-held piston corer in three light-free sites (stations 1–3) located at increasing distances from the entrance. At each site, two additional 500-ml sediment samples were collected for an in vivo study of the Gastrotricha. Faunistic analysis found a fairly high meiobenthic diversity, identifying representatives of more than 12 major groups, with total abundances ranging from 656 ind./10 cm2 (10 cm2) in November to 1,069 ind./10 cm2 in June. Station 1, the closest to the entrance invariably hosted the most abundant meiofaunal community (851 ind./10 cm2 in November and 1932 ind./10 cm2 in June), followed by station 2 or 3 depending on the season. While nematodes and harpacticoids appear as the most abundant taxa when the cave is considered as a whole, other taxa may prevail numerically in selected stations, e.g. priapulids, which are the second most abundant taxon at station 1 (30 ind./10 cm2 in November and 83 ind./10 cm2 in June). Although the density of total meiofauna and that of the single groups may not be very high, the cave is interesting by virtue of the peculiarity of the hosted fauna, e.g., species and genera new to science or new to the Mediterranean Sea. Regarding the Gastrotricha, we found 16 species, accounting for 1.3–2.6% of the total meiobenthos (density = 8.4 ind./10 cm2 in November and 27.4 ind./10 cm2 in June). Analysis of the gastrotrich community found, particularly in June, an assemblage of taxa quite different from those found in open habitats, even at the family level; differences that are probably due to the exploitation of different food resources by animals populating the two environments, i.e. algae in the open sea versus bacteria in the caves. Results indicate that for meiofauna, as happens for macrofauna, the marine caves may represent hotspots of biodiversity and endemism; the driving forces at the base of the trophic depletion hypothesis seem to be responsible for structuring the meiofauna community inside the cave.
Similar content being viewed by others
References
Balduzzi A, Bianchi CN, Boero F, Cattaneo Vietti R, Pansini M, Sarà M (1989) The suspension-feeder communities of a Mediterranean sea cave. In: Ros JD (ed) Topics in marine biology. Sci Mar 53:287–395
Balsamo M, Fregni E, Tongiorgi P (1995) Marine Gastrotricha from the coasts of Sardinia (Italy). Boll Zool 62:273–286
Balsamo M, Ferraguti M, Guidi L, Todaro MA, Tongiorgi P (2002) Reproductive system and spermatozoa of Paraturbanella teissieri (Gastrotricha, Macrodasyida): implications for sperm transfer modality in Turbanellidae. Zoomorphology 121:235–241
Boaden PJS (1974) Three new thiobiotic Gastrotricha. Cah Biol Mar 15:367–378
Boesgaard TM, Kristensen RM (2001) Tardigrades from Australian marine caves. With a redescription of Actinarctus neretinus (Arthrotardigrada). Zool Anz 240:253–264
Bussotti S, Guidetti P, Belmonte G (2003) Distribution patterns of the cardinal fish, Apogon imberbis, in shallow marine caves in southern Apulia (SE Italy). Ital J Zool 70:153–157
Chevaldonne P, Lejeusne C (2003) Regional warming-induced species shift in north-west Mediterranean marine caves. Ecol Lett 6:371–379
Cinelli F, Fresi E, Mazzella P, Pansini M, Pronzato R, Svoboda A (1977) Distribution of benthic phyto- and zoocenoses along a light gradient in a superficial marine cave. In: Keegan BF, O’Ceidigh P, Boaden PJS (eds) Biology of benthic organisms (Proceedings of the 11th European Marine Biology Symposium 1976, Galway, Ireland). Pergamon Press, New York, pp 173–183
Clausen C (2000) Gastrotricha Macrodasyida from the Tromsø region, northern Norway. Sarsia 85:357–384
Clausen C (2004) Gastrotricha from the Faroe Bank. Sarsia 89:423–458
Coull BC (1988) Ecology of the marine meiofauna. In: Higgins RP, Thiel H (eds) Introduction to the study of Meiofauna. Smithsonian Institution Press, Washington, pp 18–38
Fichez R (1990) Decrease in allochthonous organic inputs in dark submarine caves, connection with lowering in benthic community richness. Hydrobiologia 207:61–69
Fichez R (1991) Benthic oxygen uptake and carbon cycling under aphotic and resource-limiting conditions in a submarine cave. Mar Biol 110:137–143
Fize A (1963) Contribution á l´étude de la microfaune des sables littoraux du Golfe d´Aigues-mortes. Vie Milieu 14:669–774
Folk RL (1958) Petrology of sedimentary rocks. Hemphills, Austin
Fox CA, Powell EN (1986) Meiofauna and the sulfide system: the effects of oxygen and sulfide on the adenylate pool of three turbellarians and a gastrotrich. Comp Biochem Physiol 85:37–44
Fregni E, Tongiorgi P, Faienza MG (1998) Two new species of Urodasys (Gastroricha, Macrodasyidae) with cuticular stylet. Ital J Zool 65:377–380
Gagne GD (1977) Dolichodasys elongatus n.g., n.sp., a new macrodasyid gastrotrich from New England. T. Am Microsc Soc 96:19–27
Gallo D’Addabbo M, De Zio Grimaldi S, Sandulli R (2001) Heterotardigrada of two submarine caves in San Domino island (Tremiti islands) in the Mediterranean sea. Zool Anz 240:361–369
Giere O (1993) Meiobenthology. The microscopic fauna in aquatic sediments. Springer, Berlin Heidelberg New York
Giere O, Eleftheriou A, Murison DJ (1988) Abiotic factors. In: Higgins RP, Thiel H (eds) Introduction to the study of meiofauna. Smithsonian Institution Press, Washington, pp 61–78
Guidi L, Pierboni L, Ferraguti M, Todaro MA, Balsamo M (2004) Spermatology of the genus Lepidodasys Remane, 1926 (Gastrotricha, Macrodasyida): towards a revision of the family Lepidodasyidae Remane, 1927. Acta Zool Stockholm 85:211–221
Harmelin JG (1980) Etablissement des communautés de substrat durs en milieu obscur. Résultats préliminaires d’une experience à long terme en Méditerranée. Mem Biol Mar Oceanogr 10(suppl.):29–52
Harmelin JG (1997) Diversity of bryozoans in a Mediterranean sublittoral cave with bathyal like conditions: role of dispersal processes and local factors. Mar Ecol Prog Ser 153:139–152
Harmelin JG, Vacelet J (1997) Clues to deep-sea biodiversity in a nearshore cave. Vie Milieu 47:351–354
Harmelin JG, Vacelet J, Vasseur P (1985) Les grottes sous-marines obscures: un milieu extreme et un remarquable biotope refuge. Tethys 11:214–229
Higgins RP, Thiel H (eds) (1988) Introduction to the study of Meiofauna. Smithsonian Institution Press, Washington
Hochberg R (2005) Musculature of the primitive gastrotrich Neodasys (Chaetonotida): functional adaptations to the interstitial environment and phylogenetic significance. Mar Biol 146:315–323
Hochberg R, Litvaitis MK (2000) Phylogeny of gastrotricha: a morphology-based framework of gastrotrich relationships. Biol Bull 198:299–305
Hochberg R, Litvaitis MK (2001) Macrodasyida (Gastrotricha): a cladistic analysis of morphology. Invertebr Biol 120:124–135
d’Hondt JL (1971) Gastrotricha. Oceanogr Mar Biol 9:141–192
Hummon WD (2004) Global database for marine Gastrotricha. Server at http://www.132.235.243.28 under Eastern Mediterranean and Red Seas
Lejeusne C, Chevaldonne P (2005) Population structure and life history of Hemimysis margalefi (Crustacea: Mysidacea), a ‘thermophilic’ cave-dwelling species benefiting from the warming of the NW Mediterranean. Mar Ecol Prog Ser 287:189–199
Maguire C, Boaden PJS (1975) Energy and evolution in the thiobios: an extrapolation from the marine gastrotrich Thiodasys sterreri. Cah Biol Mar 26:635–646
Marotta R, Guidi L, Pierboni L, Ferraguti M, Todaro MA, Balsamo M (2005) Sperm ultrastructure of Macrodasys caudatus (Gastrotricha: Macrodasyida) and a sperm based phylogenetic analysis of Gastrotricha. Meiofauna Mar 14:9–21
Marti R, Uriz MJ, Ballesteros E, Turon X (2004) Benthic assemblages in two Mediterranean caves: species diversity and coverage as a function of abiotic parameters and geographic distance. J Mar Biol Assoc UK 84:557–572
Moens T, Vincx M (1997) Observations on the feeding ecology of estuarine nematodes. J Mar Biol Assoc UK 77:211–227
Nicholas LW, Todaro MA (2005) Observations on Gastrotricha from a sandy beach in southeastern Australia with a description of Halichaetonotus australis sp. nov. (Gastrotricha: Chaetonotida). New Zeal J Mar Fresh 39:973–980
Onorato R, Denitto F, Belmonte G (1999) Le grotte marine del Salento: classificazione, localizzazione e descrizione. Thalassia Salentina 23:67–116
Ohtsuka S, Hanamura Y, Kase T (2002) A new species of Thetispelecaris (Crustacea: Peracarida) from submarine cave on Grand Cayman Island. Zool Sci 19:611–624
Palacin C, Masalles D (1986) Some data on the meiofauna of an underwater cave of the island of Majorca, Spain. Publ Dep Zool, Barcelona 12:15–26
Pansini M (1996) Petrosia pulitzeri n. sp. (Porifera, Demospongiae) from Mediterranean caves. Ital J Zool 63:169–172
Pesta O (1959) Harpacticoiden (Crustacea: Copepoda) aus submariner hohlen und den benachbarten Litoralbezirken am Zap von Sorrent (Neapel). Pubbl Staz Zool Napoli 30(suppl.):95–117
Pfannkuche O, Thiel H (1988) Sample processing. In: Higgins RP, Thiel H (eds) Introduction to the study of meiofauna. Smithsonian Institution Press, Washington, pp 134–145
Powell EN, Crenshaw MA, Rieger RM (1979) Adaptations to sulfide in the meiofauna of the sulfide system. I. 35S-sulfide accumlation and the presence of a sulfide detoxication system. J Exp Mar Biol Ecol 37:57–76
Riedl R (1959) Die Hydroiden des Golfes von Neapel und ihr Anteil an der Fauna unterseeischen Höhlen. In: Ergebnisse der Österreichischen Tyrrhenia-Expedition 1952, Teil xvi. Pubbl Staz Zool Napoli, 30 (suppl.):591–755
Riedl R (1966) Biologie der Meereshöhlen. Paul Parey, Hamburg
Ruppert EE (1970) On Pseudostomella Swedmark 1956 with descriptions of P. plumosa nov. spec., P. cataphracta nov. spec. and a form of P. roscovita Swedmark 1956 from the west Atlantic coast. Cah Biol Mar 11:121–143
Seward–Thompson BL, Hails JR (1973) An appraisal of the computation of statistical parameters in grain size analysis. Sedimentology 20:161–169
Sandulli R, Gallo D’addabbo M, De Lucia Morone MR, D’Addabbo R, Pietanza R, Grimaldi-De Zio S (1999) Preliminary investigations on meiofauna of two caves in San Domino island (Tremiti Archipelago, Adriatic Sea). Biol Mar Medit 6:437–440
Sandulli R, De Zio-Grimaldi S, Gallo D’addabbo M (2002) Meiofauna. In: Cicogna F, Bianchi CN, Ferrari G, Forti P (eds) Grotte Marine, cinquant’anni di ricerche in Italia. Ministero dell’Ambiente e della Tutela del Territorio, Roma, pp 273–278
Sørensen MV, Jørgensen A, Boesgaard TM (2000) A new echinoderes (Kinorhyncha, Cyclorhagida) from a submarine cave in new south Wales, Australia. Cah Biol Mar 41:167–179
Stock JH (1993) Some remarkable distribution patterns in stygobiont Amphipoda. J Nat Hist 27:807–819
Todaro MA (1992) Contribution to the study of the Mediterranean meiofauna: Gastrotricha from the Island of Ponza, Italy. Boll Zool 59:321–333
Todaro MA (1998) Meiofauna from the Meloria Shoals: Gastrotricha, biodiversity and seasonal dynamics. Biol Mar Medit 5:587–590
Todaro MA (2002) An interesting new gastrotrich from littoral meiobenthos (Long Beach Island, USA), with a key to species of Tetranchyroderma (Gastrotricha: Macrodasyida). J Mar Biol Assoc UK 82:555–563
Todaro MA, Shirley TC (2003) A new meiobenthic priapulid (Priapulida, Tubiluchidae) from a Mediterranean submarine cave. Ital J Zool 70:79–87
Todaro MA, Rocha CEF (2004) Diversity and distribution of marine Gastrotricha along the northern beaches of the state of São Paulo (Brazil), with description of a new species of Macrodasys (Macrodasyida, Macrodasyidae). J Nat Hist 38:1605–1634
Todaro MA, Rocha CEF (2005) Further data on marine gastrotrichs from the State of São Paulo and the first records from the State of Rio de Janeiro (Brazil). Meiofauna Mar 14:27–31
Todaro MA, Fleeger JW, Hu YP, Hrincevich AW, Foltz DW (1996) Are meiofauna species cosmopolitan? Morphological and molecular analyses of Xenotrichula intermedia (Gastrotricha: Chaetonotida). Mar Biol 125:735–742
Todaro MA, Bernhard JM, Hummon WD (2000) A new species of Urodasys (Gastrotricha, Macrodasyida) from dysoxic sediments of the Santa Barbara Basin (California, USA). Bull Mar Sci 66:467–476
Todaro MA, Hummon WD, Balsamo M, Fregni E, Tongiorgi P (2001) Inventario dei Gastrotrichi marini italiani: una checklist annotata. Atti Soc Tosc Sci Nat Mem Ser B 107:75–137
Todaro MA, Littlewood DTJ, Balsamo M, Herniou EA, Cassanelli S, Manicardi G, Wirz A, Tongiorgi P (2003a) The interrelationships of the Gastrotricha using nuclear small rRNA subunit sequence data, with an interpretation based on morphology. Zool Anz 242:145–156
Todaro MA, Matinato L, Balsamo M, Tongiorgi P (2003b) Faunistics and zoogeographical overview of the Mediterranean and Black Sea marine Gastrotricha. Biogeographia 24:131–160
Todaro MA, Balsamo M, Kristensen RM (2005) A new genus of marine chaetonotids (Gastrotricha), with a description of two new species from Greenland and Denmark. J Mar Biol Assoc UK 85:1391–1400
Tongiorgi P, Fregni E, Balsamo M (1999) Gastrotricha from Italian brackish environment with description of a new species of Chaetonotus. J Mar Biol Assoc UK 79:585–592
Vacelet J, Boury-Esnault N, Harmelin JG (1994) Hexactinellid cave, a unique deep-sea habitat in the scuba zone. Deep Sea Res 41:965–973
Villora-Moreno S (1996) New genus and species of the deep-sea family Coronarctidae (Tardigrada) from a submarine cave with a deep-sea like condition. Sarsia 81:275–283
Wieser W (1954) Beitrage zur Kenntnis der Nematoden submariner Hohlen. Österr Zool Ztschr 1/2:172–230
Zabala M, Riera T, Gili JM, Barange M, Lobo A, Penuelas J (1989) Water flow, trophic depletion, and benthic macrofauna impoverishment in a submarine cave from the Western Mediterranean. PSZNI Mar Ecol 10:271–287
Acknowledgments
We are grateful to G. Belmonte (University of Lecce) for providing us with invaluable information on Grotta del Ciolo and priceless logistic help during sampling. D. Mosci assisted by SCUBA divers of the ‘Gruppo Speleologico Neretino’ (Lecce) collected the samples. We thank W.D. Hummon and an anonymous reviewer for the insightful comments on an earlier draft of the manuscript. The research is within the framework of the project, biodiversity of inconspicuous organisms in Italian marine protected areas (BIOIMPA) and benefited from a grant by the Italian Ministry of Research (MIUR Prin-2004 “Contributo della meiofauna alla biodiversità marina italiana”) M.A. Todaro Co-PI.
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by R. Cattaneo-Vietti, Genova
Rights and permissions
About this article
Cite this article
Todaro, M.A., Leasi, F., Bizzarri, N. et al. Meiofauna densities and gastrotrich community composition in a Mediterranean sea cave. Mar Biol 149, 1079–1091 (2006). https://doi.org/10.1007/s00227-006-0299-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00227-006-0299-z