Use of saggital otolith shape analysis to discriminate Northeast Atlantic and Western Mediterranean stocks of Atlantic saury, Scomberesox saurus saurus (Walbaum)

Agüera, Antonio; Brophy, Deirdre

doi:10.1016/j.fishres.2011.06.003

Cited by 61 publications

(37 citation statements)

References 28 publications

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“…european eel, Anguilla anguilla (L. 1758)] can only be examined by the traditional, full-body inspection or examination of other hard formulas (e.g. otolith [1]), where the individual does not survive the investigation.…”

Section: Discussionmentioning

confidence: 99%

“…however, the process of taking a proper morphometric image of the whole body is highly stressful for fish, and therefore, the investigation of a structural component, variable enough to distinguish populations and easy to collect without permanently damaging the animal is more expedient [8]. Assuming a strong genetic definiteness, scales, similarly to other hard structural components like otolith [1,17] and in general bony structures [33], are regularly used to distinguish among species or even populations of fish [10][11][12][22][23][24]. The examination of scales proved to be a practical and cheap tool to identify fish including archaeological samples as well [15,30].…”

Section: Introductionmentioning

confidence: 99%

“…(received: november 22, 2012; accepted: february 1,2013) Intraspecific morphological variability may reflect either genetic divergence among groups of individuals or response of individuals to environmental circumstances within the frame of phenotypic plasticity. Several studies were able to discriminate wild fish populations based on their scale shape.…”

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confidence: 99%

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Impact of environmental and genetic factors on the scale shape of zebrafish,Danio rerio(Hamilton 1822): A geometric morphometric study

Staszny¹,

Havas²,

Kovács³

et al. 2013

Acta Biologica Hungarica

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of environmental and genetic factors on the scale shape of zebrafish,Danio rerio(Hamilton 1822): A geometric morphometric study

Staszny¹,

Havas²,

Kovács³

et al. 2013

Acta Biologica Hungarica

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“…In this context, the three indices are dimensionless numbers between 0 and 1. The form-factor, aspect ratio, and roundness were computed following the formulae given by Tuset et al (2003), Pothin et al (2006) and Agüera and Brophy (2010). The size-based shape descriptors were used to analyse the stabilization in the otolith form as a function of total body length.…”

Section: Otolith Measurements and Proceduresmentioning

confidence: 99%

“…The sagittal otoliths are the largest of the three types of otoliths and are the ones most used for fish ageing (MoralesNin 1985, Secor et al 1992. The morphology and morphometry of sagittal otoliths are species-specific feature traits (Hecht andAppelbaum 1982, Volpedo andEcheverría 2000), and they are very useful for population or stock identification (Campana and Casselman 1993, Bird et al 1986, Smith 1992, Friedland and Reddin 1994, Begg and Brown 2000, Agüera and Brophy 2010. In addition, morphology and morphometry of otoliths have been important for trophic ecology studies (Härkönen 1986, Tuset et al 1996, Tombari et al 2000, for taxonomy (e.g.…”

Section: Introductionmentioning

confidence: 99%

On the intraspecific variation in morphometry and shape of sagittal otoliths of common sardine, <i>Strangomera bentincki</i>, off central-southern Chile

Curin-Osorio¹,

Cubillos²,

Chong³

2011

Sci. Mar.

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SUMMARY: Size and shape of fish otoliths are species-specific, but some species also display intraspecific variations. The common sardine, Strangomera bentincki, is a small pelagic fish inhabiting a seasonal upwelling ecosystem off centralsouthern Chile, having two discrete spawning sites along its latitudinal distribution. Otoliths of specimens were collected from commercial catches in Talcahuano and Corral, representing the central and south spawning zones. On the basis of otolith images, size-based shape descriptors were used to detect ontogenetic variation, and morphometric variables (length, breadth, area, perimeter and weight) were used to detect geographical differences in size and shape of otoliths. Outline analysis was studied on the basis of elliptic Fourier descriptors through multivariate statistical procedures. Size-based shape descriptors showed that otolith shape starts to be stable for fish larger than 12 cm total length, which keep an elliptical form. Morphometric variables for fish larger than 12 cm revealed intraspecific variation between central and south zones, which were associated with otolith weight and breadth. Outline analysis did not reveal significant spatial differences, but extreme intraspecific variation was due to the antirostrum, excisure, and posterior part of otoliths. Intraspecific variation in otolith size could be linked to differences in each spawning habitat and related to geographical origin, whose differences are not clearly identified. It is concluded that intraspecific variability in morphometric variables of sardine otoliths revealed geographic differences in size that are not attributable to allometric effects, and that otolith shape was similar between specimens from different geographic origin.Keywords: otolith, outline, shape descriptors, intraspecific, Fourier, sardine, pelagic. RESUMEN: Sobre la variación intra-específica en la morfometría y forma del otolito sagita de sardina común (Strangomera bentincki) en la zona centro-sur de Chile. -El tamaño y la forma de los otolitos de los peces son específicos, pero algunas especies también muestran variaciones intraespecíficas. La sardina común, Strangomera bentincki, es un pez pelágico pequeño que habita en un ecosistema de afloramiento estacional en la zona centro-sur de Chile, y tiene dos áreas discretas de desove a lo largo de su distribución latitudinal. Se obtuvieron otolitos a partir de las capturas comerciales en Talcahuano y Corral, que representan las zonas de desove del centro y sur. Sobre la base de imágenes de otolitos, los descriptores de la forma basados en el tamaño fueron usados para detectar variación ontogenética, y las variables morfométricas (longitud, ancho, área, perímetro, y peso) se utilizaron para detectar diferencias geográficas en el tamaño y la forma de los otolitos. El análisis de contorno fue estudiado sobre la base de los descriptores elípticos de Fourier a través de procedimientos estadísticos multivariados. Los descriptores de forma mostraron que la forma del otolito comienza a ser es...

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Ocean warming and acidification alter the behavioral response to flow of the sea urchin Paracentrotus lividus

Cohen‐Rengifo

Agüera

Bouma

et al. 2019

Ecology and Evolution

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Ocean warming (OW) and acidification (OA) are intensively investigated as they pose major threats to marine organism. However, little effort is dedicated to another collateral climate change stressor, the increased frequency, and intensity of storm events, here referred to as intensified hydrodynamics. A 2‐month experiment was performed to identify how OW and OA (temperature: 21°C; pHT: 7.7, 7.4; control: 17°C‐pHT7.9) affect the resistance to hydrodynamics in the sea urchin Paracentrotus lividus using an integrative approach that includes physiology, biomechanics, and behavior. Biomechanics was studied under both no‐flow condition at the tube foot (TF) scale and flow condition at the individual scale. For the former, TF disk adhesive properties (attachment strength, tenacity) and TF stem mechanical properties (breaking force, extensibility, tensile strength, stiffness, toughness) were evaluated. For the latter, resistance to flow was addressed as the flow velocity at which individuals detached. Under near‐ and far‐future OW and OA, individuals fully balanced their acid‐base status, but skeletal growth was halved. TF adhesive properties were not affected by treatments. Compared to the control, mechanical properties were in general improved under pHT7.7 while in the extreme treatment (21°C‐pHT7.4) breaking force was diminished. Three behavioral strategies were implemented by sea urchins and acted together to cope with flow: improving TF attachment, streamlining, and escaping. Behavioral responses varied according to treatment and flow velocity. For instance, individuals at 21°C‐pHT7.4 increased the density of attached TF at slow flows or controlled TF detachment at fast flows to compensate for weakened TF mechanical properties. They also showed an absence of streamlining favoring an escaping behavior as they ventured in a riskier faster movement at slow flows. At faster flows, the effects of OW and OA were detrimental causing earlier dislodgment. These plastic behaviors reflect a potential scope for acclimation in the field, where this species already experiences diel temperature and pH fluctuations.

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Use of saggital otolith shape analysis to discriminate Northeast Atlantic and Western Mediterranean stocks of Atlantic saury, Scomberesox saurus saurus (Walbaum)

Cited by 61 publications

References 28 publications

Impact of environmental and genetic factors on the scale shape of zebrafish,Danio rerio(Hamilton 1822): A geometric morphometric study

Impact of environmental and genetic factors on the scale shape of zebrafish,Danio rerio(Hamilton 1822): A geometric morphometric study

On the intraspecific variation in morphometry and shape of sagittal otoliths of common sardine, <i>Strangomera bentincki</i>, off central-southern Chile

Ocean warming and acidification alter the behavioral response to flow of the sea urchin Paracentrotus lividus

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