Abnormal mortalities of the carpet shell clam<i>Ruditapes decussatus</i>(Linnaeus 1756) in natural bed populations: a practical approach

Aranguren, Raquel; Gomez‐León, Javier; Balseiro, Pablo; Costa, María M.; Novoa, Beatriz; Figueras, António

doi:10.1111/are.12074

Cited by 14 publications

(11 citation statements)

References 19 publications

(36 reference statements)

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“…A massive mortality in shellfish during the last days of February in shellfish beds (i.e., clams and cockles) surrounding the mooring station was linked to the decreasing salinity abruptly and was reported by local media. Similar mortality episodes had been previously reported in the Rıá de Arousa Arousa (Parada and Molares, 2008;Parada et al, 2012;Aranguren et al, 2014). These unexpected oscillations are a challenge for species adaptation that particularly affect sessile organisms, such as bivalves, which due to their reduced mobility (Berger and Kharazova, 1997;Helmuth and Hofmann, 2001;Alves de Almeida et al, 2007).…”

Section: Ecosystems Impactsupporting

confidence: 80%

Advancing real-time pH sensing capabilities to monitor coastal acidification as measured in a productive and dynamic estuary (Ría de Arousa, NW Spain)

Velo

Pad́ın²

2022

Front. Mar. Sci.

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Ocean acidification has critical impacts on marine ecosystems, but presents knowledge gaps on the ecological impacts requiring large-scale monitoring of physicochemical conditions to predict biological responses to ocean pH projections. The threat is especially significant in coastal regions like upwelling areas which are more sensitive and appear to respond more rapidly to anthropogenic perturbations. These ecosystems, such as the northwest coast of the Iberian Peninsula are characterized by complex physical and biogeochemical interactions, supporting enormous biological productivity and productive fisheries. The distribution of pH in upwelling systems has high variability on short temporal and spatial scales preventing a complete picture of acidification, which exhibit long-term pH rates markedly different from the measured in open waters. This motivation to significantly expand the coverage of pH monitoring in coastal areas has driven us to develop an autonomous pH monitoring instrument (from now on SURCOM) based on the Honeywell Durafet® pH electrode. A relevant feature is that SURCOM transmits near real-time pH and temperature measurements every 10.5 min through SIGFOX®, a low-power, low-bandwidth network for data transmission. This very careful design allows us to achieve a very low power consumption for the complete system resulting in 3 years of full autonomy with no other need than external cleaning and calibration. In this paper we describe the setup and the data set obtained by a SURCOM instrument over 240 days in a highly productive and dynamic coastal ecosystem, the Ría de Arousa embayment, providing valuable information on the performance of these low-cost and highly stable sensors, with potential for improving the pH variability description in nearshore systems and for reinforcing the monitoring-modeling of coastal acidification.

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Section: Ecosystems Impactsupporting

confidence: 80%

Advancing real-time pH sensing capabilities to monitor coastal acidification as measured in a productive and dynamic estuary (Ría de Arousa, NW Spain)

Velo

Pad́ın²

2022

Front. Mar. Sci.

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“…Since the probability of being in energy deficit is very high during spring, that could contribute to a slowdown of reproduction in all species but R. philippinarum in March, and in May with dramatic, not only ecological, but also economic consequences. Bivalve fisheries already experience high spatial and temporal variability in catches that are related to high mortality due to strong fluctuations in environmental conditions such as temperature and salinity (Juanes et al, 2012;Parada et al, 2012;Morgan et al, 2013;Aranguren et al, 2014). This fact is aggravated when reductions in reproductive output could lead to a recruitment failure into adult populations (Shanks et al, 2020) especially given the extremely high mortality (>95%) during pelagic larval development and benthic recruitment (e.g., Rumrill, 1990;Gosselin and Qian, 1997).…”

Section: Discussionmentioning

confidence: 99%

Reproduction Under Stress: Acute Effect of Low Salinities and Heat Waves on Reproductive Cycle of Four Ecologically and Commercially Important Bivalves

et al. 2021

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The impacts of climate change on the structure and functioning of estuaries is a major focus of concern, even more when the affected species support important fisheries as the bivalves Ruditapes decussatus, Ruditapes philippinarum, Venerupis corrugata, and Cerastoderma edule in Europe. Their reproductive performance, in the context of climate stressors, had not been investigated so far. Our objective was to experimentally evaluate acute stress effects over gonad development after 6 days of low salinity stress in autumn, winter and spring as well as 4 days of heatwave stress during emersion in summer. These are the most probable extreme events that bivalves should face in our latitudes. Four different salinity ramps (5–20, 10–25, 15–30, 30–30) were created during simulated tidal cycles in mesocosms for the low salinity experiments. Also four sediment heatwaves at emersion (20–20, 20–27, 20–32, 20–37°C) were done during simulated tidal cycle. Both low salinity and heatwave stresses over such short periods compromised reproduction; the acute response was species-specific and varied with the time of the year, and therefore, with the stage of the gametogenic cycle. In December, during sexual resting and the beginning of gametogenesis, a delay in gametogenesis at lower salinities was recorded in the four species. However, at the peak of the reproductive period (March and May), different responses were observed: abnormal oocytes in R. decussatus and resorption of gametes with haemocytic infiltration in R. philippinarum and V. corrugata. Likewise sediment temperatures higher than 32°C provoked gonadal resorption and severe haemocytic invasion in V. corrugata, R. decussatus, and C. edule but had no effect in R. philippinarum. These responses to both environmental stressors might be related to the allocation of energy from reproduction toward defense and repair mechanisms to ensure survival. Contrastingly, low salinities triggered massive spawning in C. edule that could lead to a mismatch between the presence of larvae and phytoplankton, causing potentially starvation and thus reducing recruitment success. Reproduction of theses bivalves would be compromised if low salinity episodes in winter and spring, even for short periods of time such as those in these experiments, are followed by a heatwave in summer. Furthermore the impact would be magnified if this situation happens during consecutive years preventing replenishment of the shellfish beds.

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“…Field studies have determined that bivalve mortality results from the interaction of environmental conditions, physiological status and the genetics of the host and the infectious agent, which could be an opportunist rather than a primary pathogen (Samain & McCombie 2008, Aranguren et al 2012). In our bath infection experiments, temperature changes and hypoxic stress were included to mimic environmental changes because they have been implicated in bivalve deaths (Soletchnik et al 1999, Lee et al 2001.…”

Section: Discussionmentioning

confidence: 99%

“…Aetiological disease agents in farmed bivalves, such as Bonamia, Haplosporidium, Perkinsus, Marteilia, several strains of Vibrio and also herpesviruses have been characterized after the occurrence of massive mortality outbreaks (Figueras & Novoa 2011). Deaths in bivalves are associated with unusual changes in temperature, salinity or pollution (Tsuchiya 1983, Pipe & Coles 1995, Aranguren et al 2012, as well as with normal seasonal fluctuations of those environmental parameters (Degremont et al 2005, Soletchnik et al 2007.…”

Section: Introductionmentioning

confidence: 99%

Occurrence, seasonality and infectivity of Vibrio strains in natural populations of mussels Mytilus galloprovincialis

Romero

Costa²,

Forn-Cuní³

et al. 2014

Dis. Aquat. Org.

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Widespread and large-scale mortalities of bivalve molluscs significantly affect their production. A number of pathogens have been identified as the primary causes of death in oysters or clams, especially bacteria of the genus Vibrio. We evaluated the occurrence, seasonality and infectivity of Vibrio strains associated with natural mussel (Mytilus galloprovincialis) populations. In particular, different isolates of V. splendidus and V. aestuarianus were analysed because they were associated with major oyster mortalities in areas where mussels are cultured without presenting mortalities. The presence of both Vibrio spp. was analysed bimonthly in mussels, water, sediment, plankton and other associated fauna from 2 sites in Galicia (NW Spain), the region with the highest mussel production in Europe. Environmental factors were also considered. The pathogenicity of different Vibrio isolates was analysed by performing experimental infections in mussels with strains isolated from the field. Results showed that Vibrio populations were mainly influenced by changes in water temperature and salinity. V. splendidus was dominant during the warm months and V. aestuarianus was predominant throughout the cold season. The sediment was the most important natural reservoir for bacteria. Experimental infections showed the extreme resistance of mussels to bacterial pathogens. Isolates of V. splendidus and V. aestuarianus were only moderately pathogenic for mussels in intramuscular infections and bath infections, and mortalities only occurred when animals were infected with a high bacterial concentration in adverse environmental conditions (hypoxia and 25°C). Although the pathogenicity of the Vibrio strains isolated from the wild was low for mussels, their potential risk for other bivalves cannot be ignored.

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Abnormal mortalities of the carpet shell clamRuditapes decussatus(Linnaeus 1756) in natural bed populations: a practical approach

Cited by 14 publications

References 19 publications

Advancing real-time pH sensing capabilities to monitor coastal acidification as measured in a productive and dynamic estuary (Ría de Arousa, NW Spain)

Advancing real-time pH sensing capabilities to monitor coastal acidification as measured in a productive and dynamic estuary (Ría de Arousa, NW Spain)

Reproduction Under Stress: Acute Effect of Low Salinities and Heat Waves on Reproductive Cycle of Four Ecologically and Commercially Important Bivalves

Occurrence, seasonality and infectivity of Vibrio strains in natural populations of mussels Mytilus galloprovincialis

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