Marine Biodiversity Records

Research Article

First record of Halidrys siliquosa on the Portuguese coast: counter-intuitive range expansion?

Fernando P. Limaa1a2a3 p1 c1, Nuno Queiroza1a2a4, Pedro A. Ribeiroa1a2a3, Raquel Xaviera1a2, Stephen J. Hawkinsa3a4 and António M. Santosa1a2

a1 CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Campus Agrário de Vairão, 4485-661 Vairão, Portugal

a2 Departamento de Zoologia-Antropologia, Faculdade de Ciências da Universidade do Porto, 4099-002 Porto, Portugal

a3 Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth, PL1 2PB, UK

a4 School of Oceanographic Sciences, University of Wales, Bangor, Menai Bridge, Anglesey, Wales, UK

Abstract

The occurrence of the pod weed, Halidrys siliquosa, is recorded for the first time on the Portuguese coast. Several specimens of this brown algae were observed attached to the rocky surface in tide pools at 41º44′10″N 8º52′34″W, extending southward its previously known geographical distribution. The observed shift is inconsistent with general predictions of species migrations under warming climate conditions, which anticipate poleward shifts rather than southern expansions. Although more data will be required to undoubtedly uncover its cause, the recently observed range expansion raises important questions about the generalization of the previously stated biogeographic rules.

(Received June 15 2007)

(Accepted April 16 2008)

Keywords

  • Halidrys siliquosa ;
  • biogeography;
  • climate change;
  • intertidal;
  • Portugal;
  • range limit

Correspondence:

c1 Correspondence should be addressed to: Fernando P. Lima, CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Campus Agrário de Vairão, 4485-661 Vairão, Portugal email: fplima@fc.up.pt

p1 Present address: School of Biological Sciences, University of South Carolina, SC 29208, USA