Trophic relationships between a Patagonian gastropod and its epibiotic anemone revealed by using stable isotopes and direct observations

Zabala, Soledad; Bigatti, Gregório; Botto, Florencia; Iribarne, Oscar; Galván, David Edgardo

doi:10.1007/s00227-012-2143-y

Cited by 24 publications

(23 citation statements)

References 47 publications

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“…Accordingly, at young stages (\30 mm of body length), the snail would feed on small prey, while at larger size especimen ([50 mm), appear to target much larger prey (Andrade and Ríos 2007). The few isotopic data available for the carnivorous snail Adelomelon ancilla and the anemone Antholoba achates (Zabala et al 2013) are similar to the values obtained in the present study.…”

supporting

confidence: 88%

Trophic structure of shallow-water benthic communities in the sub-Antarctic Strait of Magellan

et al. 2016

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Trophic structure is among the most fundamental characteristics of an ecosystem since it is a useful way to determine the main energy flow at the ecosystem level. In the Magellan Strait, the local spatial heterogeneity at the shallow-waters ecosystems may have a great variety of potential food sources; however, knowledge about their biological communities and their structure is still unclear. We examined the trophic structure of shallow-water-mixed bottom communities at two sites in the sub-Antarctic Magellan Strait based on carbon (d 13 C) and nitrogen (d 15 N) stable isotope ratios. The benthic communities were composed of 46 species from 20 major taxa at Bahía Laredo (BL) and 55 species from 18 major taxa at Punta Santa Ana (PSA). Benthic macroalgae and organic matter associated with sediment are the major primary food sources at both sites. Although both sites are quite similar in their food sources and in their vertical trophic structure (Cthree trophic levels), the food web structure varied distinctly. Functionally, predators and grazers dominated both communities, but top predators were shorebirds, carnivore anemones and predatory nemerteans at BL, and sea stars, shorebirds, crabs and fishes at PSA. The distinct differences in the trophic structure at BL and PSA highlight the important variability of d 15 N at the base of the benthic food web, the role of local environmental conditions and community dynamics in structuring shallow-water communities.

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confidence: 88%

Trophic structure of shallow-water benthic communities in the sub-Antarctic Strait of Magellan

et al. 2016

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“…Various species of edible gastropods belonging to Nassariidae, Muricidae and Volutidae inhabit this coastal zone. We studied three species: Adelomelon ancilla (Lightfoot, 1786), which feeds on live bivalves and other gastropod species, and inhabits mixed sediments (Zabala et al 2013a); Buccinanops globulosus (Kiener, 1832) (=Buccinanops deformis (King, 1832) sensu Scarabino et al 2006), which feeds on carrion (Bökenhans 2014) and lives buried in muddy sediments (Scarabino 1977); and Trophon geversianus (Pallas, 1774), which inhabits the bivalve complex Brachidontes rodriguezii (d'Orbigny, 1842)/Perumytilus purpuratus (Lamarck, 1819) and feeds on them. These gastropods are locally consumed and commercialized albeit without official regulations or safety quality controls (Narvarte 2006;Bigatti & Ciocco 2008;Bigatti et al 2015).…”

Section: Introductionmentioning

confidence: 99%

High bioaccumulation of cadmium and other metals in Patagonian edible gastropods

Primost

Gil

Bigatti

2017

Marine Biology Research

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High concentrations of metals are accumulated by edible marine resources, affecting human health. Marine gastropods have been commercially captured and consumed in Argentina for decades without official regulations or studies to guarantee their safety. In this study, metals (cadmium, aluminium, iron, zinc, copper and lead) were analysed for the first time in the edible marine gastropods Buccinanops globulosus, Adelomelon ancilla and Trophon geversianus and their surrounding sediments. Taking into account the maximum levels recommended by national and international regulations for food safety, we recommend consuming only the foot of these gastropod species. We recommend not consuming these gastropods from harbour areas due to concentrations of lead in sediments and tissues. Though the target hazard quotient (THQ) of cadmium was not high for the local community, it could be higher for other populations who consume molluscs more frequently, indicating a potential health risk of chronic exposure. Monitoring of these and other contaminants should be performed in order to ensure food safety of these marine resources. ARTICLE HISTORY

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“…The seaweed bed is acknowledged as the most productive habitat on earth, and its net primary production (NPP) can reach as high as 0.5-3.5 kg•C/m 2 per year [4,5]. In seaweed bed habitats, benthic primary producers (e.g., macroalgae and microphytobenthos) and pelagic primary producers (e.g., phytoplankton) provide abundant food sources for grazing food chains [6]. Thus, large amounts of detritus produced by primary producers are transported by hydrodynamic forces and the sedimentation-resuspension effect, leading to a complex composition of sedimentary organic matter (SOM) and suspended particulate organic matter (SPOM).…”

Section: Introductionmentioning

confidence: 99%

Re-Evaluation of the Impacts of Dietary Preferences on Macroinvertebrate Trophic Sources: An Analysis of Seaweed Bed Habitats Using the Integration of Stable Isotope and Observational Data

et al. 2018

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Stable isotope analyses of food webs have been used in previous decades to determine trophic sources and food web structures. The use of stable isotope models to estimate consumption contributions is based on a type of multivariate beta distribution called the Dirichlet distribution. The Dirichlet distribution does not conclude the p i = 0 and p i = 1 situation. Thus, scientists have previously assumed that every potential trophic source contributes to consumption in stable isotope models. However, animals have dietary preferences and some trophic resources may not contribute to consumption. Less is known about the effects of species-specific dietary processes on stable isotope analyses, especially in regard to trophic contribution estimation. In this study, we develop methods to determine consumers' "real potential trophic sources" and "discrimination factors" using lab-based observations and lab-based discrimination experiments. We describe a dietary process-based stable isotope mixing model (D-SIMM) that integrates lab-based dietary preference observations and the stable isotope mixing model (SIMM) to estimate trophic contributions. Then, we present the application of D-SIMM on three representative macroinvertebrate species in our study area (sea urchin: Anthocidaris crassispina (A. crassispina); gastropod: Turbo cornutus (T. cornutus); and mussel: Septifer virgatus (S. virgatus)) to re-evaluate source-consumer contributions. Thus, we compare the differences between the source contribution estimation results of SIMM and D-SIMM by calculating the standardized convex hull area (TA) of species-specific trophic sources and the consumer standard ellipses area (SEA) of the potential trophic source group. Three examples illustrate significant differences in species-specific dietary preferences between consumers, resulting in systematic difference for TA, SEA and trophic source contribution estimation results between SIMM and D-SIMM. As such, D-SIMM explains p i = 0 of certain trophic sources, which often causes uncertainty and is ignored in previous SIMM research. In addition, species-specific discrimination factors should be noticed during trophic source estimation. For estimation of the trophic contribution of source-consumers, our findings imply that the dietary preferences of consumers should be fully considered before SIMM analysis, and that D-SIMM is a more ecological process and robust measure. Additionally, we found high macroalgae (MAC) coverage in seaweed beds and a high detritus contribution of MAC to sedimentary organic matter (SOM). These findings, combined with the high contributions of MAC and SOM to consumers, suggest that MAC and its debris are the basal trophic sources for gastropods, sea urchins and mussels in seaweed bed habitats. The conservation of seaweed beds should be fully considered to ensure sustainable utilization of shellfish.

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Trophic relationships between a Patagonian gastropod and its epibiotic anemone revealed by using stable isotopes and direct observations

Cited by 24 publications

References 47 publications

Trophic structure of shallow-water benthic communities in the sub-Antarctic Strait of Magellan

Trophic structure of shallow-water benthic communities in the sub-Antarctic Strait of Magellan

High bioaccumulation of cadmium and other metals in Patagonian edible gastropods

Re-Evaluation of the Impacts of Dietary Preferences on Macroinvertebrate Trophic Sources: An Analysis of Seaweed Bed Habitats Using the Integration of Stable Isotope and Observational Data

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