Octopuses and drilling snails as the main suspects of predation traces on shelled molluscs in West Antarctica

Gordillo, Sandra; Morán, Gisela A.; Malvé, Mariano E.

doi:10.1007/s00300-021-02975-5

Cited by 3 publications

(2 citation statements)

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“…A second pattern (two irregular holes) was observed in some mactrid shells from station 15 and could be caused when the octopus holds the prey with its beak (upper and lower beak) while releasing saliva that acts by softening the surrounding area. For comparison, a similar pattern was described for bivalve shells belonging to Antarctic communities (Gordillo et al ., 2021), where, moreover, there are no crabs. However, at the moment we have no other information on the behaviour and feeding patterns of octopus's species in the studied region, except for the work by Iribarne et al .…”

Section: Discussionmentioning

confidence: 99%

Predatory drilling on molluscan assemblages along the Patagonian shelf (southern Argentina)

Gordillo,

Bayer

2024

J. Mar. Biol. Ass.

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Both present-day and fossil molluscan assemblages offer an opportunity for a better understanding of the structure and organization of both modern and past benthic communities. In this framework, drill holes are used widely to explore predator–prey interactions. This research focuses on predation marks, especially drill holes, recorded on modern molluscan assemblages in a Patagonian sector of the Argentinean continental shelf. Shelled molluscs (n = 2179) were recovered from 27 to 135 m depths covering a long latitudinal extent (between 39° and 54°S). For each station, taxonomic position, ecological composition and relative abundance of taxa were determined, and then drilling frequency (DF) was calculated to infer drilling intensity. The collected molluscs belong to 37 families, with Veneridae being the most abundant in terms of the number of specimens (n = 419). Specimens with drill holes (n = 226) belong to 21 families (with at least 33 different species). Most of them are suspension feeders (85.8%) and the remaining percentage comprised other trophic types. Naticids and muricids, as main potential predators, together account for 19.6% of the gastropods present in the molluscan assemblages. DF across all the stations was moderate (9.9%) but varied between low (0–2.4%) and high (28.9%). These results do not show a trend linked to latitude or depth, and the great variability of DF between stations suggests that other local ecological or environmental conditions would influence drilling predation at a small spatio-scale.

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Section: Discussionmentioning

confidence: 99%

Predatory drilling on molluscan assemblages along the Patagonian shelf (southern Argentina)

Gordillo,

Bayer

2024

J. Mar. Biol. Ass.

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“…Paleontological research on predation has expanded rapidly in scope, methods, and goals. In the recent years, many studies focused on documenting the evidence of predation from times, geographic areas, and taxa that are poorly known for their predation record (Rojas et al 2014; Randle and Sansom 2019; Bicknell and Holland 2020; Gordillo and Malvé 2021; Klompmaker and Landman 2021; Gordillo et al 2022) and using predation records for testing evolutionary hypotheses (Klompmaker et al 2017; Gehling and Droser 2018; Harper et al 2018; Lerosey-Aubril and Peel 2018; Petsios et al 2021). In contrast, a relatively small number of studies focused on the analytical methods to evaluate the reliability of predation measures in recent years (Smith et al 2018, 2019, 2022; Budd and Mann 2019).…”

Section: Discussionmentioning

confidence: 99%

Community evenness and sample size affect estimates of predation intensity and prey selection: A model-based validation

Bhattacherjee

Chattopadhyay

2022

Preprint

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Predation estimates inferred from the preserved records of predation traces are essential in evaluating the evolutionary effect of ecological interactions. It is, however, rarely investigated how sampling intensity and community composition of an assemblage influence the reliability of these measures.Using a resampling technique, we evaluated the effect of evenness and sampling intensity of a community on the inferred predation estimates. We theoretically simulated model communities representing different levels of evenness (ET), predation intensity (PIT), and predatory behavior (selective, non-selective). These communities were resampled without replacement; we noted the variation in the inferred predation intensity (PIT.inf) and the number of prey species (Sprey.inf) during resampling. Our results demonstrate that ET does not influence PIT.inf for non-selective predation. However, communities with highly selective predation are sensitive to evenness and sampling intensity; PIT.inf of these assemblages can substantially deviate from the actual value. Sprey.inf is also influenced by ET, predation selectivity, and PIT. For non-selective predation, sampling intensity heavily influences communities with low ET and low PIT; Sprey.inf is underrepresented at smaller sample size. For prey-abundance guides selective predation, the sensitivity depends on the nature of selection; for communities of low ET and PIT where rare species are attacked preferentially, the Sprey.inf deviates significantly at small sample size. We proposed a post-facto standardization method for comparing predation estimates of discrete communities. We validated its utility using the published predation data of the Plio-Pleistocene molluscan fossil assemblage. This approach provides critical insight into the biological reliability of predator estimates across time and space.

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Unveiling the Permian and Triassic record of drilling predation on ostracods

Forel¹,

Bergue

Maranhão

2022

Marine Micropaleontology

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Octopuses and drilling snails as the main suspects of predation traces on shelled molluscs in West Antarctica

Cited by 3 publications

References 63 publications

Predatory drilling on molluscan assemblages along the Patagonian shelf (southern Argentina)

Predatory drilling on molluscan assemblages along the Patagonian shelf (southern Argentina)

Community evenness and sample size affect estimates of predation intensity and prey selection: A model-based validation

Unveiling the Permian and Triassic record of drilling predation on ostracods

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