Isotopic niche and niche overlap in benthic crustacean and demersal fish associated to the bottom trawl fishing in south-central Chile

Ponce, Tania; Cubillos, Luis A.; Ciancio, Javier; Castro, Leonardo R.; Araya, Miguel

doi:10.1016/j.seares.2021.102059

Cited by 8 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ekman transport and Ekman pumping may act synchronously to extend and produce highest Chl-a values during spring-summer [ 53 ]. This high productivity is the most significant carbon contribution towards deep waters, acting as a pelagic-benthic coupling in central Chile [ 19 ]. Additionally, the topographic effect caused by the meridional changes of the coastline orientation, dominates the wind-induced upwelling in several parts of the Chilean coast, namely at 30°S, 33°S and 37°S [ 25 ], observed in the wind-stress and Chl- a concentration patterns during the studied period.…”

Section: Discussionmentioning

confidence: 99%

“…The demersal community of the HCS has been described using prospective surveys, which is dominated by the Chilean hake Merluccius gayi , bigeye flounder Hippoglossina macrops , and nylon shrimp Heterocarpus reedi [ 14 , 17 , 18 ]. Three to four groups of species assemblages have been previously identified for demersal fishes and crustaceans [ 14 , 17 , 19 ] based on the depth distribution of the species and trophic interactions. However, intra-annual variability and its dependence on surface physical processes are poorly understood.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spatio-temporal patterns of the crustacean demersal fishery discard from the south Humboldt Current System, based on scientific observer program (2014–2019)

Landaeta

Hernández-Santoro

Search³

et al. 2023

PLoS ONE

View full text Add to dashboard Cite

This study summarises six years of spatio-temporal patterns of the discarded demersal community fauna recorded by onboard scientific observer program for both artisanal and industrial crustacean fisheries between 2014 and 2019, from mesophotic to aphotic depths (96 to 650 m) along the southern Humboldt Current System (28–38°S). In this period, one cold and two warm climatic events were observed during the austral summer 2014, 2015–2016 (ENSO Godzilla), and 2016–2017 (coastal ENSO), respectively. Satellite information showed that Chlorophyll-a concentration varied seasonally and latitudinally, associated with upwelling centres, while equatorial wind stress decreased southward of 36°S. Discards were composed of 108 species, dominated by finfish and molluscs. The Chilean hake Merluccius gayi was dominant and ubiquitous (occurrence, 95% of 9104 hauls), being the most vulnerable species of the bycatch. Three assemblages were identified: assemblage 1 (~200 m deep), dominated by flounders Hippoglossina macrops and lemon crabs Platymera gaudichaudii, assemblage 2 (~260 m deep), dominated by squat lobsters Pleuroncodes monodon and Cervimunida johni and assemblage 3 (~320 m depth), dominated by grenadiers Coelorinchus aconcagua and cardinalfish Epigonus crassicaudus. These assemblages were segregated by depth, and varied by year, and geographic zone. The latter represented changes in the width of the continental shelf, increasing southward of 36°S. Alpha-diversity indexes (richness, Shannon, Simpson, and Pielou) also varied with depth and latitude, with higher diversity in deeper continental waters (>300 m), between 2018–2019. Finally, at a spatial scale of tens of kilometres, and a monthly basis, interannual variations of biodiversity occurred in the demersal community. Surface sea temperature, chlorophyll-a, or wind stress did not correlate with discarded demersal fauna diversity of the crustacean fishery operating along central Chile.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatio-temporal patterns of the crustacean demersal fishery discard from the south Humboldt Current System, based on scientific observer program (2014–2019)

Landaeta

Hernández-Santoro

Search³

et al. 2023

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…Quantification using Bayesian analytical methods, such as Stable Isotope Bayesian Ellipses in R (SIBER; Jackson et al, 2011), has rapidly grown in popularity (Shipley & Matich, 2020; Skinner et al, 2022) because of their ability to statistically quantify niche space (Jackson et al, 2011). SIBER aims to explain population variability and has quantified the isotopic niches of a diverse array of aquatic consumers from mobile species such as tuna (Laiz‐Carrión et al, 2019), to sessile corals (Conti‐Jerpe et al, 2020; Price et al, 2021; Santos et al, 2021; Wall et al, 2021) and sponges (Freeman et al, 2015; Shih et al, 2020), benthic fish and crustaceans (Ponce et al, 2021), reef fish in the Caribbean (Stuthmann & Castellanos‐Galindo, 2020), and damselfish in the Pacific (Gajdzik et al, 2018). However, within‐species individual specialization and/or overlapping isotope values in dietary sources make reliance on only δ 15 N and δ 13 C for isotopic niche characterization unsuitable in certain scenarios.…”

Section: Introductionmentioning

confidence: 99%

Improving stable isotope assessments of inter‐ and intra‐species variation in coral reef fish trophic strategies

Cybulski

Skinner

Wan

et al. 2022

Ecology and Evolution

View full text Add to dashboard Cite

Fish have one of the highest occurrences of individual specialization in trophic strategies among Eukaryotes. Yet, few studies characterize this variation during trophic niche analysis, limiting our understanding of aquatic food web dynamics. Stable isotope analysis (SIA) with advanced Bayesian statistics is one way to incorporate this individual trophic variation when quantifying niche size. However, studies using SIA to investigate trophodynamics have mostly focused on species‐ or guild‐level (i.e., assumed similar trophic strategy) analyses in settings where source isotopes are well‐resolved. These parameters are uncommon in an ecological context. Here, we use Stable Isotope Bayesian Ellipses in R (SIBER) to investigate cross‐guild trophodynamics of 11 reef fish species within an oceanic atoll. We compared two‐ ( δ 15 N and δ 13 C) versus three‐dimensional ( δ 15 N, δ 13 C, and δ 34 S) reconstructions of isotopic niche space for interpreting guild‐, species‐, and individual‐level trophic strategies. Reef fish isotope compositions varied significantly among, but also within, guilds. Individuals of the same species did not cluster together based on their isotope values, suggesting within‐species specializations. Furthermore, while two‐dimensional isotopic niches helped differentiate reef fish resource use, niche overlap among species was exceptionally high. The addition of δ 34 S and the generation of three‐dimensional isotopic niches were needed to further characterize their isotopic niches and better evaluate potential trophic strategies. These data suggest that δ 34 S may reveal fluctuations in resource availability, which are not detectable using only δ 15 N and δ 13 C. We recommend that researchers include δ 34 S in future aquatic food web studies.

show abstract

Combined use of carbon, nitrogen and sulfur stable isotopes reveal trophic structure and connections in deep-sea mesopelagic and demersal fish communities from the Southeastern Pacific Ocean

Ñacari

Escribano

Harrod

et al. 2023

Deep Sea Research Part I: Oceanographic Research Papers

View full text Add to dashboard Cite

Isotopic niche and niche overlap in benthic crustacean and demersal fish associated to the bottom trawl fishing in south-central Chile

Cited by 8 publications

References 49 publications

Spatio-temporal patterns of the crustacean demersal fishery discard from the south Humboldt Current System, based on scientific observer program (2014–2019)

Spatio-temporal patterns of the crustacean demersal fishery discard from the south Humboldt Current System, based on scientific observer program (2014–2019)

Improving stable isotope assessments of inter‐ and intra‐species variation in coral reef fish trophic strategies

Combined use of carbon, nitrogen and sulfur stable isotopes reveal trophic structure and connections in deep-sea mesopelagic and demersal fish communities from the Southeastern Pacific Ocean

Contact Info

Product

Resources

About