Evaluating stable isotopic signals in bivalve Pinna nobilis under different human pressures

Alomar, Carme; Vázquez‐Luis, Maite; Magraner, Kika; Lozano, Laura; Deudero, Salud

doi:10.1016/j.jembe.2015.03.006

Cited by 30 publications

(29 citation statements)

References 51 publications

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“…These processes explain the low δ 13 C values encountered during the spawning season. Instead, after the gametogenesis, the low δ 13 C values recorded during the colder months could be linked with environmental conditions (Alomar et al, 2015) since carbon isotope values reflect the source of food more than trophic levels; for instance, a terrestrial versus offshore source (Rau et al, 1992;Hobson et al, 1995). Moreover, exogenous factors such as sediment temperature (van der Geest et al, 2014) might influence organic composition and subsequently modify δ 13 C. Indeed, increasing temperatures are related with the peak of δ 13 C in August (Power et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…A differential zonation guarantees full protection at no-take zones and pen shell populations in these zones where no anchoring damage is inflicted are more mature and more numerous compared to populations at the main island of Mallorca (Hendriks et al, 2012a;Vázquez-Luis et al, 2014a;Deudero et al, 2015). Since most confounding factors present in intensively used coastal regions are excluded in this area, the National Park has been the site of choice for studies addressing ecological responses of http://epublishing.ekt.gr | e-Publisher: EKT | Downloaded at 29/03/2019 05:49:06 | Pinna nobilis and evaluating the effect of anthropogenic impacts, with Cabrera MPA as a control zone (Hendriks et al, 2012a, b;Vazquez-Luis et al, 2014a, b;Alomar et al, 2015;Deudero et al, 2015).…”

Section: Study Areamentioning

confidence: 99%

“…Pen shells exposed to anthropogenic pressures in the coastal waters around the Balearic Islands show differences in isotopic signals in their tissues as well as a marked seasonal variation, indicating a rapid isotopic response to environmental changes (Cabanellas-Reboredo et al, 2009b;Alomar et al, 2015). Values of δ 15 N are used quantitatively to assess trophic level, whereas δ 13 C is generally applied to indicate the relative contribution of different potential primary sources in a food web to the diet, and to distinguish inshore versus offshore food sources (Hobson et al, 1995;Lepoint et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Reproductive investment of the pen shell Pinna nobilis Linnaeus, 1758 in Cabrera National Park (Spain)

et al. 2017

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The spawning period can be a period of particular vulnerability for a species. In hermaphroditic species like the long-lived pen shell Pinna nobilis different costs could be associated with female, male or hermaphrodite stages. Here we evaluate gonad development in a population with few anthropogenic pressures and describe the timing and succession of developmental stages, determine the ratio of the sexes and the condition of the animals. We assess resource mobilisation and associated costs through the relationship between stable isotopes and condition indexes with reproductive parameters and evaluate the role of the adductor muscle as storage organ used in gonad maturation. In our study area only one spawning season is observed, starting in May and peaking in June-July. The onset of spawning coincides with water temperatures of 20 °C. Condition indexes drop during the spawning period and recover afterwards to reach pre-spawning values in November. Stable isotope signals are negatively related to the gonadal condition index, while the CN ratio shows a positive correlation with the same index. Additionally, the muscle condition index sharply decreases after the start of the spawning season, which suggests that P. nobilis uses the reserves stored in the adductor muscle for reproduction as in other Pinnidae species. Reproductive indices and stable isotopes ratios indicate ‘capital breeding’ as reproductive strategy of the pen shell. Decreased muscle force could mean a higher vulnerability during the summer period, coinciding with the peak in recreational activities involving poaching and anchoring.

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Section: Discussionmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reproductive investment of the pen shell Pinna nobilis Linnaeus, 1758 in Cabrera National Park (Spain)

et al. 2017

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“…Although P. nobilis is a filter feeder, it seems to preferentially ingest detritus (95% of ingested material), phytoplankton, micro-and mesozooplankton and pollen grains. This might depend on the specific region though, as Alomar et al (2015) did show that the diet of P. nobilis is related to the pelagic rather than the benthic compartment, with phytoplankton the highest contributing food source. Differential feeding is exhibited by consumption of high number of harpacticoid copepods in all size classes (Davenport et al, 2011).…”

Section: Feedingmentioning

confidence: 92%

“…Feeding ecology of P. nobilis has been investigated using stable isotopes (Alomar et al, 2015;Cabanellas-Reboredo et al, 2009bKennedy et al, 2001), stomach content analysis (Davenport et al, 2011) and fatty acid composition (Najdek et al, 2013). Pinna nobilis inhabiting seagrass beds rely on particulate and sedimentary organic matter, seagrass leaves and their epiphytes for food (Cabanellas-Reboredo et al, 2010).…”

Section: Feedingmentioning

confidence: 99%

The Pen Shell, Pinna nobilis

Basso

Vázquez‐Luis

García‐March

et al. 2015

Advances in Marine Biology

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Human impacts on the endangered fan mussel,Pinna nobilis

Öndes

Kaiser

Güçlüsoy

2019

Aquatic Conservation

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Pinna nobilis is a sensitive and vulnerable species and is hence considered a good indicator of anthropogenic pressures on marine ecosystems. This study provides novel data on the density and distribution of endangered P. nobilis on the Turkish coasts. Threats to the status of P. nobilis, including by‐catch and illegal collection, were assessed, as was the general awareness of people about the endangered status of fan mussels. The data sources consisted of direct observations from diving surveys and the local ecological knowledge (LEK) of fishers and scuba‐divers. Results demonstrated that the density of P. nobilis significantly changed with environmental parameters, such as depth, and among different sampling areas. The number of damaged individuals was lowest in the areas that were distant from human influences such as ports and tourist beaches. The density estimations of P. nobilis across a wide geographic area around the Turkish coasts revealed that the density of fan mussels was highest around western coasts in comparison with southern coasts. Fishers and divers indicated that the population of this species has decreased during the last decade. The main causes of this decline were suggested to be the impacts of fishing gear, poaching, pollution, and boat anchoring. The highest volume of by‐catch was estimated to be taken by trawls. In general, the knowledge and local awareness of the conservation importance and status of fan mussels was poor. The study has identified those areas where fan mussels occur at a high density, and hence may indicate areas for possible conservation protection status. Second, areas exposed to the illegal harvesting of fan mussels were highlighted. Societal concern would benefit from educational activities to raise awareness of the ecological importance and conservation needs for fan mussels in Turkey.

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Evaluating stable isotopic signals in bivalve Pinna nobilis under different human pressures

Cited by 30 publications

References 51 publications

Reproductive investment of the pen shell Pinna nobilis Linnaeus, 1758 in Cabrera National Park (Spain)

Reproductive investment of the pen shell Pinna nobilis Linnaeus, 1758 in Cabrera National Park (Spain)

The Pen Shell, Pinna nobilis

Human impacts on the endangered fan mussel,Pinna nobilis

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