Hydrobiologia

, Volume 772, Issue 1, pp 247–259 | Cite as

Common, rare or extirpated? Shifting baselines for common angelshark, Squatina squatina (Elasmobranchii: Squatinidae), in the Northern Adriatic Sea (Mediterranean Sea)

  • Tomaso Fortibuoni
  • Diego Borme
  • Gianluca Franceschini
  • Otello Giovanardi
  • Saša Raicevich
Primary Research Paper

Abstract

Historical baselines are needed to reconstruct long-term changes in marine animal populations and enhance our ability to articulate management recommendations. We reconstructed common angelshark (Squatina squatina) abundance in the Northern Adriatic Sea over the last two centuries by integrating different sources of formal and informal information. The wide amount of information collected helped assessing if the species is actually extirpated from the area, as stated in previous studies. According to naturalists’ accounts and historical documents, in the nineteenth and early twenty-first centuries the species was so abundant to sustain targeted fisheries, and large quantities of S. squatina were sold in the main fish markets. In the 1960s, the species collapsed and got economically extinct. Even if it was never caught in the area through scientific surveys during the period 1948–2014, from fishermen interviews emerged that the species is not extirpated. However, only 50% of interviewees caught S. squatina at least once and they were significantly older than the fishermen that never caught it (shifting baseline syndrome). Moreover, the size of the fish caught significantly decreased through time, indicating the depletion of larger individuals. Our integrated approach can be applied to any poorly assessed species so that appropriate international conservation measures can be prioritized.

Keywords

Endangered species Naturalists’ accounts Landings Scientific survey Historical ecology Fishers’ ecological knowledge 

Supplementary material

10750_2016_2671_MOESM1_ESM.pdf (3.6 mb)
Supplementary material 1 (PDF 3716 kb)

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Tomaso Fortibuoni
    • 1
  • Diego Borme
    • 2
  • Gianluca Franceschini
    • 1
  • Otello Giovanardi
    • 1
    • 3
  • Saša Raicevich
    • 1
    • 3
  1. 1.Italian National Institute for Environmental Protection and Research (ISPRA, Istituto Superiore per la Protezione e la Ricerca Ambientale)ChioggiaItaly
  2. 2.National Institute of Oceanography and Experimental Geophysics (OGS, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale)TriesteItaly
  3. 3.Italian National Research Council - Institute of Marine Sciences (CNR-ISMAR, Consiglio Nazionale delle Ricerche – Istituto di Scienze Marine)AnconaItaly

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