Hierarchical Analysis Of Spatial Distribution Patterns Of Patellid Limpets In The Canary Islands

Navarro, Pablo González; Ramírez, Raquel; Tuya, Fernando; Fernández-Gil, C.; Sánchez-Jérez, Pablo; Haroun, Ricardo

doi:10.1093/mollus/eyi009

Cited by 44 publications

(61 citation statements)

References 22 publications

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“…Populations showed depletion of large sizes in unprotected areas, where the maximum size of any individual limpet was 52 mm for P. ulyssiponensis and 47 mm for P. candei crenata, in comparison with 78 mm and 71 mm, respectively within the MPA. The selection bias towards larger sizes is a direct consequence of anthropogenic impacts, previously noted in other regions of the Canary Islands (Navarro et al 2005, Ramírez et al 2009) and elsewhere for other molluscs (e.g. Keough et al 1993, Ferraz et al 2001, Roy et al 2003, Branch and Odendaal 2003, Sagarin et al 2007.…”

Section: Discussionmentioning

confidence: 79%

“…Over time populations are being progressively 'fished down' (Moreno 2001, Martins et al 2008, causing severe changes in population structure and an overall reduction in the density and size frequency of the resource. Previous studies in the Canary Islands have shown that intense exploitation of intertidal limpets leads to a dramatic reduction, and even local extinction, of populations of P. candei crenata (Côrte-Real et al 1996, Navarro et al 2005. This previous knowledge and the fact that protection at the MPA only partially improved the health of the patellid populations studied highlights the need for development of more appropriate management of these species.…”

Section: Discussionmentioning

confidence: 85%

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Contrasting effects of protection from harvesting in populations of two limpet species in a recently established marine protected area

et al. 2011

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SUMMARY: This study aimed to evaluate the effects of protection from extractive activities on the population structure of two limpets of commercial interest, Patella ulyssiponensis and Patella candei crenata. We evaluated the status of these populations in La Palma Marine Protected Area (MPA), Canary Islands, and in comparable unprotected areas in the lower intertidal zone of the same island. We showed that the density of P. ulyssiponensis depended greatly on the level of protection, whereas the effects of protection on the density of P. candei crenata were less clear and only differences between sites were found. These results are probably linked to the different habitat affinities of the two species studied and demonstrate the need to tailor conservation strategies in MPAs to individual species for appropriate management of local shellfish resources.Keywords: marine protected area, shellfishing, intertidal habitat, Patella ulyssiponensis, Patella candei crenata, Canary Islands.RESUMEN: Diferentes efectos de la protección frente al marisqueo en las poblaciones de dos especies de lapas en una reserva marina de reciente creación. -Este estudio tiene por objetivo evaluar el efecto de la protección frente a actividades extractivas sobre la estructura poblacional de las especies de lapas de interés marisquero, Patella ulyssiponensis y Patella candei crenata. Para ello, se evaluó el estado de sus poblaciones en el intermareal inferior de localidades situadas tanto dentro de la Reserva Marina de La Palma (islas Canarias) como en zonas no protegidas de características similares. Se observó que la densidad de P. ulyssiponensis depende en gran medida del nivel de protección, mientras que en el caso de P. candei crenata el efecto de la protección sobre la densidad no fue tan claro, observándose diferencias sólo entre localidades. Estos resultados probablemente se relacionan con las distintas afinidades de hábitat entre las especies estudiadas, lo que indica la necesidad de proteger áreas más heterogéneas que incluyan una variedad de hábitat adecuada para la diversidad de especies de una región, asegurando una correcta regulación y conservación de los recursos marisqueros.Palabras clave: reserva marina, marisqueo, hábitat intermareal, Patella ulyssiponensis, Patella candei crenata, islas Canarias.

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 85%

Contrasting effects of protection from harvesting in populations of two limpet species in a recently established marine protected area

et al. 2011

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“…It is known that the gastropods related species may exhibit distinct accumulation strategies for heavy metals [22][23][24][25]. The studied gastropods present some differences regarding to their vertical distributions (tidal height of habitat) in the intertidal zone of the Canary Islands [12]. It could affect to their food supply (type of microalgae) and consequently provoke differences in the metals uptake [11,26,27].…”

Section: Discussionmentioning

confidence: 99%

“…We must take into account that food is one of the major entrance of Cd into humans [2]. In our case, the limpets and topshell snails are widely harvested and consumed by local people throughout the Canarian Archipelago [12,13]. This could suppose a harmful metal transfer that, until now, has not been valued in the realized medical studies [14].…”

Section: Introductionmentioning

confidence: 99%

Gastropod molluscs as indicators of the cadmium natural inputs in the Canarian Archipelago (Eastern Atlantic Ocean)

Ramírez¹,

Collado²,

Bergasa³

et al. 2006

WIT Transactions on Biomedicine and Health, Vol 10

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Nowadays, gastropod molluscs are being utilized more and more as bioindicator organisms. Similarly, harmful metals on human health such as cadmium have been widely studied. The Canarian Archipelago (specifically the eastern islands) is constantly bathed by the African coastal upwelling, provoking oceanographic and biological differences between the islands. This process could assume an increase in the Cd concentration in their coastal waters and in the biota. Thus, in order to assess this fact, we measured cadmium concentrations in the soft parts of two species of limpets (Patella rustica and Patella candei crenata) and in a topshell snail (Osilinus atrata). Metal determination was performed using atomic absorption spectrometry (AAS). We found significant differences for metal concentrations between the eastern islands and the western islands for all species. P. rustica, P. c. crenata and O. atrata presented values ranging from 7.71, 2.11 and 7.56 µg g -1 dry wt. (eastern islands) to 1.38, 0.4 and 1.08 µg g -1 dry wt. (western islands) respectively. Therefore, we concluded that limpets and topshell snails seem to be suitable indicators of the cadmium concentrations in the coastal waters of the Canary Islands.

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“…and topsnail (Osilinus spp.) [6,7]. These gastropods are commonly harvested and consumed by humans [5,8] and it could possibly be a harmful metal transfer to the trophic web.…”

Section: Introductionmentioning

confidence: 99%

Heavy metals (Cd, Cu, Pb and Zn) in two species of limpets (Patella rustica and Patella candei crenata) in the Canary Islands, Spain

Collado¹,

Ramírez²,

Bergasa³

et al. 2006

WIT Transactions on Ecology and the Environment, Vol 95

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Nowadays, indigenous molluscs are being utilized more and more as biomonitors. Thus, in order to assess the concentrations of Cd, Cu, Pb and Zn in the Canarian Archipelago (Spain), we have utilized two species of limpets (Patella rustica and Patella candei crenata). We also tested the relationship between the metal levels and biometric parameters such as size and weight. The mean total concentrations of Cd, Cu, Pb, and Zn in P. rustica were 0.37 ± 0.05, 1.77 ± 0.09, 1.27 ± 0.07 and 8.84 ± 0.71 µg g -1 dry wt. (mean ± S.E.) respectively; whereas P. candei crenata as follows; 0.71 ± 0.10, 2.94 ± 0.11, 0.09 ± 0.01 and 33.74 ± 1.15 µg g -1 dry wt. (mean ± S.E.). We found significant differences for metal concentrations between the eastern islands and the western islands for both species. We did not observed evidences that more inhabited islands (Tenerife and Gran Canaria), had the highest metal concentration levels. Natural inputs from the upwelling region and other factors like size, food availability and/or excretion could have contributed to the variability. P. rustica presented negative correlations between metal concentrations and body weight and size, whereas, P. candei crenata showed negative correlations with Pb and with the biometric parameters. P. candei crenata revealed also positive correlation between Cd concentration and size.

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Hierarchical Analysis Of Spatial Distribution Patterns Of Patellid Limpets In The Canary Islands

Cited by 44 publications

References 22 publications

Contrasting effects of protection from harvesting in populations of two limpet species in a recently established marine protected area

Contrasting effects of protection from harvesting in populations of two limpet species in a recently established marine protected area

Gastropod molluscs as indicators of the cadmium natural inputs in the Canarian Archipelago (Eastern Atlantic Ocean)

Heavy metals (Cd, Cu, Pb and Zn) in two species of limpets (Patella rustica and Patella candei crenata) in the Canary Islands, Spain

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