Author(s): Sfriso A, Birkemeyer T, Ghetti PF
Two areas of the Venice lagoon populated by seagrasses (three stations covered by Cymodocea nodosa (Ucria) Asherson, Zostera marina Linnaeus, Zostera noltii Hornemann) or seaweeds (two stations: one covered by Ulva rigida C. Agardh and another at present without seaweed biomass) were monitored by means of six surveys over a year in order to study macrofaunal composition and seasonal changes. The seagrass stations showed a mean species richness (28–30 S m−2), individual abundance (1854–4018 N m−2) and biomass (22.3–37.7 g m−2 ash-free-dry-weight, AFDW) ca. 3–8 times higher than those populated by seaweeds (10–15 S m−2, 494–1395 N m−2 and 5.6–13.7 g m−2 AFDW). Differences among seagrass or seaweed stations were much lower. The Ulva-dominated station showed a macrofauna completely different both from the other stations and the communities recorded ca. 30 years ago, before the prolific growth of Ulva. In this station, frequent biomass decompositions and anoxic crises created critical conditions for life favouring organisms with reduced life cycles, younger individuals and the epifaunal species instead of the infaunal ones. In particular, Ulva grazers and scrapers such as Gammarus aequicauda Stock and Gibbula adriatica Philippi were found to be by far the most abundant species, whereas the taxa characteristic of the associations found in the past, in the presence of seagrasses or seaweeds and typical of low eutrophicated environments, appear strongly reduced. Marked differences in the macrophyte dominance and in the bio-physico-chemical variables which characterise the main environmental conditions of the Venice lagoon support the different distribution and composition of macrofaunal communities. Seaweed stations appear mainly governed by the seasonal cycles of these un-rooted macrophytes which, by alternating periods of production and decomposition, are responsible for the drastic reduction of macrofauna biodiversity and biomass. Conversely, seagrass stations exhibit a better oxidisation of the environment and show conditions more favourable for macrofauna colonisation, especially in the presence of macrophytes which are characterised by very well developed below-ground systems such as Cymodocea nodosa.
Author(s): Taylor DI, Nixon SW, Granger SL, Buckley BA
Author(s): Cardoso PG, Raffaelli D, Pardal MA
Author(s): Odum EP
Author(s): Mc Lusky DS
Author(s): Morrisey DJ, Skilleter GA, Ellis JI, Burns BR, Kemp CE, et al.
Author(s): Blanchet H, de Montaudouin X, Lucas A, Chardy P
Author(s): Den Hartog C
Author(s): Green EP, Short FT
Author(s): Waycott M, Duarte CM, Carruthers TJB, Orth RJ, Dennison WC, et al.
Author(s): Larkum AWD, Orth RJ, Duarte CM
Author(s): Hillman K, Mc Comb, AJ, Walker DI
Author(s): Hemminga MA, Duarte CM
Author(s): Williams SL, Heck Jr K.L.
Author(s): Duarte C.M
Author(s): Airoldi L, Beck MW
Author(s): Ganthy F, Sottolichio A, Verney R
Author(s): Do VT, de Montaudouin X, Blanchet H, Lavesque N
Author(s): Mosbahi N, Boudaya L, Dauvin JC, Neifar N
Author(s): Hamza F, Hammouda A, Chokri MA, Selmi S
Author(s): Mosbahi N, Pezy JP, Dauvin JC, Neifar L
Author(s): De Frenne P, Graae BJ, Rodríguez-Sanchez F, Kolb A, Chabrerie O, et al.
Author(s): de Montaudouin X, Blanchet H, Bazairi H, Nazik A, Desclaux-Marchand C, et al
Author(s): Hawkins SJ, Sugden HE, Mieszkowska N, Moore PJ, Poloczanska E, et al.
Author(s): Hinz H, Capasso E, Lilley M, Frost M, Jenkins SR
Author(s): Kröncke I, Reiss H, Eggleton JD, Aldridge J, et al.
Author(s): Bali M, Gueddari M
Author(s): Sammari C, Koutitonsky VG, Moussa M
Author(s): Abdennadher A, Ramirez F, Romdhane MS, Ruiz LJ, Sanpera C
Author(s): Hamza F, Hammouda A, Selmi S
Author(s): Plus M, Sebastien D, Gilles T, Isabelle A, de Montaudouin X, et al.
Author(s): Shannon CE, Weaver W
Author(s): Pielou EC
Author(s): Fauchald K., Jumars PA
Author(s): Hily C, Bouteille M
Author(s): Pranovi F, Curiel D, Rismondo A, Marzocchi M, Scattolin M
Author(s): Afli A, Ayari R, Brahim M
Author(s): Jumars PA, Dorgan KM, Lindsay SM
Author(s): Borja A, Franco J, Perez V
Author(s): Muxika I, Borja A, Bald J
Author(s): Dauvin JC, Ruellet T
Author(s): Dauvin JC, Ruellet T
Author(s): Lavesque N, Blanchet H, de Montaudouin X
Author(s): Do VT, Blanchet H, de Montaudouin X, Lavesque N
Author(s): Clarke KR, Gorley RN
Author(s): Ugland KI, Gray JS
Author(s): Boström C, Bonsdorff E
Author(s): Connolly RM
Author(s): Paula J, Fidalgo Ecosta P, Gove D
Author(s): Fredriksen S, De Backer A, Böstrom C, Christie H
Author(s): Bowden DA, Rowden AA, Martin JA
Author(s): Barnes RSK, Barnes MKS
Author(s): Teixeira H, Salas F, Pardal MA, Marques JC
Author(s): Do VT, de Montaudouin X, Lavesque N, Blanchet H, Guyard H
Author(s): Duffy JE
Author(s): Bachelet G, de Montaudouin X, Auby I, Labourg PJ
Author(s): Yamada K, Hori M, Tanaka Y, Hasegawa N, Nakaoka M
Author(s): Leopardas V, Uy W, Nakaoka M
Author(s): van der Heide T, Govers LL, de Fouw J, Olff H, van der Geest M, et al.
Author(s): Cavanaugh CM
Author(s): Anderson AE
Author(s): Castel J, Labourg PJ, Escaravage V, Auby I, Garcia ME
Author(s): Reise K, Herre E, Sturm M
Author(s): Nakamura Y, Turner JT
Author(s): Bel Hassen M, Drira Z, Hamza A, Ayadi H, Akrout F, et al.
Author(s): Coll M, Piroddi C, Steenbeek J, Kaschner K, Ben Rais Lasram F, et al.
Author(s): Pinardi N, Zavatarelli M, Arneri E, Crise A, Ravaioli M
Author(s): Bas C
Author(s): Albertelli G, Covazzi-Harriague A, Danovaro R, Fabiano M, Fraschetti S, et al.
Author(s): Salen-Picard C, Arlhac D
Author(s): Afli A, Boufahja F, Sadraoui S, Ben Mustapha K, Aissa P, et al.
Author(s): Blanchet H, Lavesque N, Ruellet T, Dauvin JC, Sauriau PG, et al.
Author(s): Reiss H, Kroncke I
Author(s): Hawkins SJ, Moore PJ, Burrows MT, Poloczanska E, Mieszkowska N, et al.
Author(s): Harley CDG, Hughes AR, Hultgren KM, Miner BG, Sorte CJB, et al.
Author(s): Helmuth B, Mieszkowska N, Moore P, Hawkins SJ