Revisiting two sympatric European seahorse species: apparent decline in the absence of exploitation

Aquatic Conservation: Marine and Freshwater Ecosystems - Tập 22 Số 4 - Trang 427-435 - 2012
Iain R. Caldwell1, Amanda C. J. Vincent1
1Project Seahorse, Fisheries Centre The University of British Columbia 2202 Main Mall Vancouver BC V6T 1Z4 Canada

Tóm tắt

ABSTRACT Seahorses are marine fish with several life history characteristics hypothesized to make them resilient but are of conservation concern because of their international trade and habitat loss. Surveys of two unexploited European seahorse species (Hippocampus guttulatus and Hippocampus hippocampus) in Ria Formosa lagoon, Portugal, were repeated seven years after their populations in the lagoon were found to be among the densest in the world. Population densities of both species declined significantly between 2001/2002 and 2008/2009 surveys (94% and 73% for H. guttulatus and H. hippocampus respectively). H. guttulatus declines were not associated with any environmental changes measured (i.e. percentage live benthic habitat cover, depth, temperature, water current speed, horizontal visibility). H. hippocampus declined more where current speed had decreased. At the low densities found in 2008/2009, occurrence for both species was best predicted by depth: seahorses were found in deeper locations throughout the lagoon. Other important predictors were temperature for H. guttulatus (found at sites warmer than average) and current speed for H. hippocampus (found in locations with faster currents). The large declines in seahorse densities made it difficult to compare results over time. Presence–absence and abundance modelling at multiple scales can help to ensure that data are comparable even when populations fluctuate drastically.Copyright © 2012 John Wiley & Sons, Ltd.

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Tài liệu tham khảo

BBC News.2011.Rare seahorse found in the River Thames London.http://www.bbc.co.uk/news/uk‐england‐london‐15215335/[7 October 2011].

10.1023/A:1024440717162

BoisseauJ.1967.Régulations hormonales de l'incubation chez un vertébré mâle: recherches sur la reproduction de l'Hippocampe. PhD dissertation Université de Bordeaux

Caldwell IR, A sedentary fish on the move: effects of displacement on long‐snouted seahorse (Hippocampus guttulatus Cuvier) movement and habitat use, Environmental Biology of Fishes

10.1016/j.aquabot.2011.08.007

10.3354/meps291081

10.1111/j.0022-1112.2006.00952.x

10.1002/aqc.798

10.1046/j.1467-2979.2003.00105.x

ErziniK BentesL CoelhoR CorreiaC LinoPG MonteiroP RibeiroJ GoncalvesJMS.2002.Recruitment of sea breams (Sparidae) and other commercially important species in the Algarve (southern Portugal) Final Report. Commission of the European Communities DG XIV/C/1.

10.1046/j.1461-0248.2001.00206.x

10.1111/j.0022-1112.2004.00429.x

10.1111/j.1095-8649.2001.tb01392.x

10.1641/0006-3568(2004)054[0297:MFPCCF]2.0.CO;2

IUCN.2012.http://www.iucnredlist.org. [30 January 2012].

10.1016/j.biocon.2007.08.017

10.1007/s11160-010-9167-5

Lourie SA, 2004, A Guide to the Identification of Seahorses

10.1016/j.biocon.2005.01.003

10.1577/1548-8446(1999)024<0006:CTDERI>2.0.CO;2

10.1016/S0272-7714(02)00332-3

Pinnegar JK, 2008, Occurrence of the short‐snouted seahorse Hippocampus hippocampus in the central North Sea, Cybium, 32, 343

10.1006/jmsc.2000.0711

Project Seahorse, 2003, IUCN 2012

Project Seahorse, 2003, IUCN 2012

R Development Core Team, 2011, A Language and Environment for Statistical Computing

10.1073/pnas.1100334108

Vincent ACJ, 1996, The International Trade in Seahorses

10.1111/j.1095-8649.2011.03003.x

10.1080/15275920802122833

10.1201/9781420010435

10.1007/978-0-387-87458-6

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Aquatic Conservation: Marine and Freshwater Ecosystems

Tập 22 Số 4

427-435

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