Dieta de Pomacea canaliculata (Gastropoda: Ampullariidae) en su hábitat natural basada en análisis de contenidos digestivos e isótopos estables

Abstract

Pomacea canaliculata is native to Rio de la Plata basin, and it is invasive in most of South and Southeast Asia after accidental introduction during unsuccessful attempts to establish commercial aquaculture of this species, and being present, the number one pest of rice crops in the region. Investigations in its native habitat are still needed because fundamental issues of its trophic ecology remain unknown. The aim of this research was to study the diet of P. canaliculata in its natural habitat through gut content techniques and stable isotopes of 13C and 15N. Biological samples were taken from November 2009 to December 2010 in Carnaval stream, a characteristic Pampean stream. Samples for stable isotopes of 13C and 15N using of a mixing model were collected in November 2011. The trophic strategy diagram evinced a generalist diet with high consumption of detritus followed by the vascular plants and algae. The mixing model results indicated that the relative contribution to the diet was similar for all basal resources: fine and coarse particulate organic matter, epipelon and aquatic macrophytes (approximately 40 %). These results evidenced a strong dietary plasticity for the species.

Invasive Apple Snail Diets in Native vs. Non-Native Habitats Defined by SIAR (Stable Isotope Analysis in R)

“…Together, carbon and nitrogen isotope ratios ( 13 C/ 12 C and 15 N/ 14 N ratios, respectively) can provide insights into the trophic relationships and the reconstruction of species diets [31][32][33]. Similar, though less comprehensive, studies have investigated the trophic ecology of apple snails (Ampullariidae; [34]) and the reconstructed food webs from ecosystems they inhabit (Pomacea spp. ; [35]).…”

More deterministic assembly constrains the diversity of gut microbiota in freshwater snails

“…Studies have suggested that dietary diversity (exogenous microbial diversity) and host physiological traits (host filtering) may impact gut microbiota alpha diversity (Reese and Dunn, 2018 ; Santos et al, 2021 ). In our study, we expected the collected invasive snails, recognized as agricultural pests and attributed with a diverse diet (López-van Oosterom et al, 2016 ; Saveanu et al, 2017 ; European Food Safety Authority et al, 2020 ), to exhibit greater gut microbiota diversity compared with the native snails. However, our findings did not align with this expectation.…”

Assessing the Impact of Biodiversity (Species Evenness) on the Trophic Position of an Invasive Species (Apple Snails) in Native and Non-Native Habitats Using Stable Isotopes

“…The Ampullariidae are commonly called apple snails [30], including a well-known invasive species, Pomacea canaliculata. This species is considered a voracious omnivore [31][32][33][34][35]. Surprisingly, where P. canaliculata are naturally distributed [30], they represent major components of freshwater biodiversity, serve as ecosystem engineers, and contribute to nutrient turnover, while serving as prey for other species [35][36][37][38][39][40][41].…”