Oceanographic influences on the early life stages of a mesopelagic fish across the Chilean Patagonia

Molina-Valdivia, Víctor; Bustos, Carlos; Castillo, Manuel; Search, Francesca V.; Plaza, Guido; Landaeta, Mauricio F.

doi:10.1016/j.pocean.2021.102572

Cited by 11 publications

(11 citation statements)

References 37 publications

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“…The major content of freshwater is located off central Patagonia, where the low-salinity surface layer dominates the stratification of the upper ocean (Saldías et al 2019). This latitudinal variability has significant effects on several characteristics of marine fishes throughout the ontogeny, such as growth, survival, and bilateral symmetry (Landaeta et al 2012(Landaeta et al , 2018Molina-Valdivia et al 2021). Additionally, species with large latitudinal distribution show shallower bodies with a smaller head at higher latitudes (Riesch et al 2018), similar to our results.…”

Section: Discussionsupporting

confidence: 87%

“…2018; Molina‐Valdivia et al. 2021). This environmental variability as well as coastal geometry may impact on the body shape variability in terrestrial (i.e., rodents, Valladares‐Gómez et al.…”

Section: Introductionmentioning

confidence: 99%

“…Both ice melting and river discharge affect visibility of marine organisms through an increase of turbidity (Castillo-Hidalgo et al 2018). Additionally, and because of the latitudinal extension of Patagonia, important sea surface temperature gradients also occur, varying from 4°C to 18°C (Bruno et al 2018;Molina-Valdivia et al 2021). This environmental variability as well as coastal geometry may impact on the body shape variability in terrestrial (i.e., rodents, Valladares-Gómez et al 2020) and marine species with shallow vertical distribution, such as some endemic eelpouts.…”

Section: Introductionmentioning

confidence: 99%

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Unraveling the morphological patterns of a subantarctic eelpout: a geometric morphometric approach

et al. 2022

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Phenotypic variation in organisms depends on the genotype and the environmental constraints of the habitat that they exploit. Therefore, for marine species inhabiting contrasting aquatic conditions, it is expected to find covariation between the shape and its spatial distribution. We studied the morphology of the head and cephalic sensory canals of the eelpout Austrolycus depressiceps (4.5–22.5 cm TL) across its latitudinal distribution in South Pacific (45°S–55°S). Geometric morphometric analyses show that the shape varied from individuals with larger snout and an extended suborbital canal to individuals with shorter snouts and frontally compressed suborbital canal. There was size variation across the sampled populations, but that size does not have a clear latitudinal gradient. Only 8% of the shape variation relates to this size variation (allometry), represented by a decrease in the relative size of the eye, and a depression of the posterior margin of the head. There were spatial differences in the shape of the head, but these differences were probably caused by allometric effects. Additionally, 2 of the canals of the cephalic lateralis pores and the head shape showed modularity in its development. This study shows that the morphology of marine fish with a shallow distribution varies across distances of hundreds of kilometers (i.e., phenotypic modulation).

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unraveling the morphological patterns of a subantarctic eelpout: a geometric morphometric approach

et al. 2022

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“…Recent studies have demonstrated the potential of using Lagrangian simulations for the investigation of larval dispersion of small pelagic fish in the Mediterranean, evidencing the key role of the physical forcing in affecting the larval spatial distribution (Palatella et al, 2014;Cuttitta et al, 2018;Torri et al, 2018;Falcini et al, 2020). Moreover, the synergic use of remote sensing allowed to characterize the larval developing environment and provided inferences on the relationships between growth and mortality of early life fish stages and recruitment processes (Falco et al, 2020;Patti et al, 2020;Molina-Valdivia et al, 2021). In this context here we provide a novel approach that takes advantage of both remote sensing data and Lagrangian techniques, in order to study the relationship between the larval growth rate and the environmental conditions experienced by marine fish larvae through an individual-based analysis performed on data collected in situ.…”

Section: Introductionmentioning

confidence: 99%

Coupling Lagrangian simulation models and remote sensing to explore the environmental effect on larval growth rate: The Mediterranean case study of round sardinella (Sardinella aurita) early life stages

Torri

Russo²,

Falcini³

et al. 2023

Front. Mar. Sci.

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The relationship between environmental conditions and early life-history traits of Sardinella aurita are investigated using material collected in two sites of the Central Mediterranean Sea. Individual mean daily growth during the planktonic phase has been determined by using otolith microstructure analysis, while Lagrangian simulation models allowed to estimate the daily position in space and time of each specimen from the hatching to the catch. Generalized Additive Mixed Models (GAMMs) have been implemented to explore the impact of environmental conditions at time t, t-1 day and t-2 days on the mean daily growth rate occurring at time t. Spatial analysis evidenced a wide dispersion of eggs and larvae in the coastal area of both sampling sites in correspondence to relatively warmer and chlorophyll-a enriched waters. Lagrangian simulations detected a complementary larval dispersal pathway able to transport larvae to a known retention area. Temperature at time t was the most important driver affecting the mean daily larval growth, followed by the food availability. On the other hand, models performed on lagged environmental covariates (t-1 and t-2) did not show any significant effect on the growth rate at time t. In addition to the sub-linear positive correlation between temperature and mean daily larval growth, model highlighted a decrease in the otolith core width at higher temperature that can be linked to an earlier stage of ontogeny at hatching. This study provided a useful methodological approach that takes advantage of available remote sensing data to perform ecological studies in support to fisheries management.

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“…Mesopelagic fishes show a great abundance in biomass, being the main component of the deep scattering layer (DSL) and mesopelagic zone, and the most abundant vertebrates on earth for their density and diffusion in all the Oceans [55,56]. Several studies have been focused worldwide on these species' distribution, biology, biodiversity and ecology [51,[56][57][58][59], also investigating morphology, microstructures and growth of sagittae [57,[60][61][62][63][64][65]. Despite this, the knowledge base on mesopelagic fishes remains scarce, with several gaps regarding the biology and eco morphology of many species and families.…”

Section: Introductionmentioning

confidence: 99%

Intraspecific variability of the saccular and utricular otoliths of the hatchetfish Argyropelecus hemigymnus (Cocco, 1829) from the Strait of Messina (Central Mediterranean Sea)

et al. 2023

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Mesopelagic species are enjoining increasing attention due to the growing impact of fisheries activities on deep marine biocenosis. Improving the knowledge base on mesopelagic species is required to enhance their conservation due to the knowledge gaps regarding many species and families. In this context, otoliths can be fundamental to assessing their life history, ecomorphological adaptation to the deep environment and stock composition. The present paper aims to explore the saccular and utricular otoliths morphology and intra-specific variability of the hatchetfish, Argyropelecus hemigymnus, from the Strait of Messina. Lapilli and sagittae were collected from 70 specimens and separated into four size classes. Morphometric, shape and SEM investigations were performed to describe their morphology, contours, and external structural organization, also studying their intraspecific variability related to sample sizes and differences between otolith pairs. Results showed an otolith morphology different from those reported in the literature with fluctuating asymmetry in sagittae and lapilli belonging to Class IV, and a high otolith variability between all the size classes. Data herein described confirm the otoliths singularity of the population from the Strait of Messina, shaped by a unique marine environment for oceanographic and ecological features.

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Oceanographic influences on the early life stages of a mesopelagic fish across the Chilean Patagonia

Cited by 11 publications

References 37 publications

Unraveling the morphological patterns of a subantarctic eelpout: a geometric morphometric approach

Unraveling the morphological patterns of a subantarctic eelpout: a geometric morphometric approach

Coupling Lagrangian simulation models and remote sensing to explore the environmental effect on larval growth rate: The Mediterranean case study of round sardinella (Sardinella aurita) early life stages

Intraspecific variability of the saccular and utricular otoliths of the hatchetfish Argyropelecus hemigymnus (Cocco, 1829) from the Strait of Messina (Central Mediterranean Sea)

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