Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal)

Authors

  • Miguel Neves dos Santos Instituto Nacional de Investigação Agrária e das Pescas (INIAP/IPIMAR), Centro Regional de Investigação Pesqueira do Sul (CRIPSul)
  • Carlos C. Monteiro Instituto Nacional de Investigação Agrária e das Pescas (INIAP/IPIMAR), Centro Regional de Investigação Pesqueira do Sul (CRIPSul)
  • Gerard Lasserre Instituto Nacional de Investigação Agrária e das Pescas (INIAP/IPIMAR), Centro Regional de Investigação Pesqueira do Sul (CRIPSul)

DOI:

https://doi.org/10.3989/scimar.2005.69n3415

Keywords:

artificial reefs, fish assemblages, intra-annual trends, Algarve (southern Portugal)

Abstract


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).

Downloads

Download data is not yet available.

Downloads

Published

2005-09-30

How to Cite

1.
Neves dos Santos M, Monteiro CC, Lasserre G. Observations and trends on the intra-annual variation of the fish assemblages on two artificial reefs in Algarve coastal waters (southern Portugal). scimar [Internet]. 2005Sep.30 [cited 2020Nov.25];69(3):415-26. Available from: http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/270

Issue

Section

Articles

Similar Articles

You may also start an advanced similarity search for this article.

Most read articles by the same author(s)