Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal)
In 1990 two artificial reefs were deployed in southern Portuguese coastal waters, off Faro (FPR) and Olhão (OPR) respectively. In order to investigate the fish assemblages and their intra-annual variability, the two artificial reefs were monitored monthly by means of visual censuses from March 1994...
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2005-09-01
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| Series: | Scientia Marina |
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| Online Access: | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/270 |
| _version_ | 1818599092063830016 |
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| author | Miguel Neves dos Santos Carlos C. Monteiro Gerard Lasserre |
| author_facet | Miguel Neves dos Santos Carlos C. Monteiro Gerard Lasserre |
| author_sort | Miguel Neves dos Santos |
| collection | DOAJ |
| description | In 1990 two artificial reefs were deployed in southern Portuguese coastal waters, off Faro (FPR) and Olhão (OPR) respectively. In order to investigate the fish assemblages and their intra-annual variability, the two artificial reefs were monitored monthly by means of visual censuses from March 1994 to February 1995. Due to the complexity of the reefs, three strata were considered for fish counts. The two artificial reefs showed similar patterns in terms of residence status and spatial occupation. Most species recorded are characteristic of the infralittoral, the Sparidae family being the most represented. OPR, which is located closer to the main openings of the Ria Formosa lagoon, showed higher mean values than FPR in terms of: fish density (2.01±0.74 fish/m3)), fish biomass (123.6±77.4 g/m3) and number of species (7.5). The effect of the juvenile fish migrations from the lagoon to the coastal waters was more evident at OPR. FPR showed a greater intra-annual variation of the ecological indexes than OPR. The results show that artificial reefs that are equal in terms of complexity and size may aggregate different fish assemblages as a result of their isolation and the influence of both hydrological features (e.g. water temperature) and endogenous biological processes in the area (e.g. proximity of nursery grounds). |
| first_indexed | 2024-12-16T12:14:05Z |
| format | Article |
| id | doaj.art-848b5e53ad3d4e6aa5a7823abc6bfd47 |
| institution | Directory Open Access Journal |
| issn | 0214-8358 1886-8134 |
| language | English |
| last_indexed | 2024-12-16T12:14:05Z |
| publishDate | 2005-09-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Scientia Marina |
| spelling | doaj.art-848b5e53ad3d4e6aa5a7823abc6bfd472022-12-21T22:32:09ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342005-09-0169341542610.3989/scimar.2005.69n3415267Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal)Miguel Neves dos Santos0Carlos C. Monteiro1Gerard Lasserre2Instituto Nacional de Investigação Agrária e das Pescas (INIAP/IPIMAR), Centro Regional de Investigação Pesqueira do Sul (CRIPSul)Instituto Nacional de Investigação Agrária e das Pescas (INIAP/IPIMAR), Centro Regional de Investigação Pesqueira do Sul (CRIPSul)Instituto Nacional de Investigação Agrária e das Pescas (INIAP/IPIMAR), Centro Regional de Investigação Pesqueira do Sul (CRIPSul)In 1990 two artificial reefs were deployed in southern Portuguese coastal waters, off Faro (FPR) and Olhão (OPR) respectively. In order to investigate the fish assemblages and their intra-annual variability, the two artificial reefs were monitored monthly by means of visual censuses from March 1994 to February 1995. Due to the complexity of the reefs, three strata were considered for fish counts. The two artificial reefs showed similar patterns in terms of residence status and spatial occupation. Most species recorded are characteristic of the infralittoral, the Sparidae family being the most represented. OPR, which is located closer to the main openings of the Ria Formosa lagoon, showed higher mean values than FPR in terms of: fish density (2.01±0.74 fish/m3)), fish biomass (123.6±77.4 g/m3) and number of species (7.5). The effect of the juvenile fish migrations from the lagoon to the coastal waters was more evident at OPR. FPR showed a greater intra-annual variation of the ecological indexes than OPR. The results show that artificial reefs that are equal in terms of complexity and size may aggregate different fish assemblages as a result of their isolation and the influence of both hydrological features (e.g. water temperature) and endogenous biological processes in the area (e.g. proximity of nursery grounds).http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/270artificial reefsfish assemblagesintra-annual trendsalgarve (southern portugal) |
| spellingShingle | Miguel Neves dos Santos Carlos C. Monteiro Gerard Lasserre Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal) Scientia Marina artificial reefs fish assemblages intra-annual trends algarve (southern portugal) |
| title | Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal) |
| title_full | Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal) |
| title_fullStr | Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal) |
| title_full_unstemmed | Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal) |
| title_short | Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal) |
| title_sort | observations and trends on the intra annual variation of the fish assemblages on two artificial reefs in algarve coastal waters southern portugal |
| topic | artificial reefs fish assemblages intra-annual trends algarve (southern portugal) |
| url | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/270 |
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