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Diet Composition and Variability of Wild Octopus Vulgaris And Diet Composition and Variability of Wild Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae: a Metagenomic Approach Lorena Olmos-Pérez, Álvaro Roura, Graham Pierce, Stéphane Boyer, Angel Gonzalez To cite this version: Lorena Olmos-Pérez, Álvaro Roura, Graham Pierce, Stéphane Boyer, Angel Gonzalez. Diet Com- position and Variability of Wild Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae: a Metagenomic Approach. Frontiers in Physiology, Frontiers, 2017, 8, 10.3389/fphys.2017.00321. hal-02140599 HAL Id: hal-02140599 https://hal.archives-ouvertes.fr/hal-02140599 Submitted on 27 May 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. ORIGINAL RESEARCH published: 24 May 2017 doi: 10.3389/fphys.2017.00321 Diet Composition and Variability of Wild Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae through a Metagenomic Lens Lorena Olmos-Pérez 1*, Álvaro Roura 1, 2, Graham J. Pierce 1, 3, Stéphane Boyer 4 and Ángel F. González 1 1 Instituto de Investigaciones Marinas, Ecobiomar, CSIC, Vigo, Spain, 2 La Trobe University, Melbourne, VIC, Australia, 3 CESAM and Departamento de Biologia, Universidade de Aveiro, Aveiro, Portugal, 4 Applied Molecular Solutions Research Group, Environmental and Animal Sciences, Unitec Institute of Technology, Auckland, New Zealand The high mortality of cephalopod early stages is the main bottleneck to grow them from paralarvae to adults in culture conditions, probably because the inadequacy of the diet that results in malnutrition. Since visual analysis of digestive tract contents of paralarvae provides little evidence of diet composition, the use of molecular tools, particularly next generation sequencing (NGS) platforms, offers an alternative to understand prey Edited by: Giovanna Ponte, preferences and nutrient requirements of wild paralarvae. In this work, we aimed to CephRes and SZN, Italy determine the diet of paralarvae of the loliginid squid Alloteuthis media and to enhance Reviewed by: the knowledge of the diet of recently hatched Octopus vulgaris paralarvae collected in Christine Huffard, Monterey Bay Aquarium Research different areas and seasons in an upwelling area (NW Spain). DNA from the dissected Institute, United States digestive glands of 32 A. media and 64 O. vulgaris paralarvae was amplified with universal Fernando Ángel Fernández-Álvarez, primers for the mitochondrial gene COI, and specific primers targeting the mitochondrial Institut de Ciències del Mar (CSIC), Spain gene 16S gene of arthropods and the mitochondrial gene 16S of Chordata. Following *Correspondence: high-throughput DNA sequencing with the MiSeq run (Illumina), up to 4,124,464 reads Lorena Olmos-Pérez were obtained and 234,090 reads of prey were successfully identified in 96.87 and [email protected] 81.25% of octopus and squid paralarvae, respectively. Overall, we identified 122 Specialty section: Molecular Taxonomic Units (MOTUs) belonging to several taxa of decapods, copepods, This article was submitted to euphausiids, amphipods, echinoderms, molluscs, and hydroids. Redundancy analysis Invertebrate Physiology, a section of the journal (RDA) showed seasonal and spatial variability in the diet of O. vulgaris and spatial Frontiers in Physiology variability in A. media diet. General Additive Models (GAM) of the most frequently detected Received: 01 March 2017 prey families of O. vulgaris revealed seasonal variability of the presence of copepods Accepted: 03 May 2017 (family Paracalanidae) and ophiuroids (family Euryalidae), spatial variability in presence Published: 24 May 2017 of crabs (family Pilumnidae) and preference in small individual octopus paralarvae for Citation: Olmos-Pérez L, Roura Á, Pierce GJ, cladocerans (family Sididae) and ophiuroids. No statistically significant variation in the Boyer S and González ÁF (2017) Diet occurrences of the most frequently identified families was revealed in A. media. Overall, Composition and Variability of Wild these results provide new clues about dietary preferences of wild cephalopod paralarvae, Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae thus opening up new scenarios for research on trophic ecology and digestive physiology through a Metagenomic Lens. under controlled conditions. Front. Physiol. 8:321. doi: 10.3389/fphys.2017.00321 Keywords: trophic ecology, NW Iberian Peninsula, paralarvae culture, NGS diet analysis, Illumina Miseq Frontiers in Physiology | www.frontiersin.org 1 May 2017 | Volume 8 | Article 321 Olmos-Pérez et al. Wild Octopus vulgaris and Alloteuthis media Paralarvae Diet INTRODUCTION feeding new born paralarvae with different diet can influence its survival (Villanueva, 1994; Iglesias et al., 2004; Farías et al., Historically, cephalopods in European waters have always been 2015). Moreover, physiological changes in digestive gland lipid viewed as a minor fisheries resource (Pierce et al., 2010). composition (Garcia et al., 2011) and higher proteolytic activity However, they can be of considerable local economic importance, were observed in paralarvae fed on other zooplankton organisms, especially in southern Europe’s artisanal fisheries. Galician waters rather than Artemia (Pereda et al., 2009). (NW Spain) support an economically important cephalopod Moreover, laboratory experiments have shown that hatchlings fishery for Octopus vulgaris (Otero et al., 2006; Pita et al., 2016) present restricted swimming capacity and prey hunting skills. and loliginid squid, mainly Loligo vulgaris but also Alloteuthis They progressively develop the ability to capture different media and Alloteuthis subulata (Jereb et al., 2015), species that zooplankton prey (Hanlon, 1990; Chen et al., 1996), suggesting are not easily distinguished due to the similarity of their external the necessity to adapt their diet at their different stages. characters (Jereb et al., 2010). Reflecting the short life cycle Thus, increasing the knowledge of dietary preferences of wild and rapid individual growth rates, cephalopod populations are cephalopod paralarvae and ontogenetic dietary changes over the sensitive to effects of environmental variation on reproduction course of their early development could help to design a suitable and recruitment (Boyle, 1990; Boyle and Rodhouse, 2005; Pierce diet for rearing in captivity. et al., 2008; Hastie et al., 2009; Rodhouse et al., 2014), resulting A few investigations have analyzed the diet of wild paralarvae in wide year to year fluctuations in captures. From 2000 to 2013, by visual identification of stomach contents, revealing that they reported cephalopod landings in Europe varied from a minimum mainly fed on copepods (Illex argentinus, Vidal and Haimovici, of 38,600 tons in 2009 to a maximum of 55,500 tons in 2004 1998), amphipods (Ommastrephes bartramii, Uchikawa et al., (ICES, 2014). 2009), and other crustaceans (Abralia trigonura and Sthenoteuthis In recent years, there has been growing interest in the oualaniensis; Vecchione, 1991). However, a high proportion of culture of cephalopods, primarily for human consumption, due stomach contents comprises unrecognizable soft material (Roura to their high growth rates, high protein contents, and high ratios et al., 2012; Camarillo-Coop et al., 2013) or small pieces of of food conversion and short life cycles (Segawa, 1990; Lee, exoskeleton (Passarella and Hopkins, 1991; Vecchione, 1991; 1995; Villanueva and Bustamante, 2006). Bearing in mind the Vidal and Haimovici, 1999). Alternative approaches have also variability of the wild cephalopod resources, there is a need for been attempted: Specific prey species of Loligo reynaudii were a stable and reliable source of cephalopods. Additional impetus detected by applying immunoassays (Venter et al., 1999) and for captive rearing arises from the use of cephalopods as model in O. vulgaris paralarvae up to 20 different prey were detected organisms in biomedical science (Bullock, 1948; Hanlon, 1990; cloning PCR products with group-specific primers (Roura et al., Fiorito and Scotto, 1992; Calisti et al., 2011) and for ornamental 2012). However, these methods are costly and time-consuming, purposes (Dunstan et al., 2010; Rodhouse et al., 2014). Despite and thus can only be applied to a limited number of samples and progress in cephalopod culture methods (e.g., Iglesias et al., clones sequenced. 2014), cephalopod species with planktonic stages have very low Zooplankton communities in the Ría de Vigo (NW Iberian survival rates of paralarvae in captive conditions (Villanueva Peninsula) are highly dynamic, presenting rapid changes in and Norman, 2008). Therefore, rearing relies on wild captured species composition and abundance according to environmental juveniles, subadults, and adults, preventing commercial viability conditions (Roura et al., 2013; Buttay et al., 2015). Previous (Hernández Moresino et al., 2014; Xavier et al., 2015). research suggests that O. vulgaris paralarvae are specialist Juvenile and sub-adult cephalopods are mainly fed with live predators, eating decapods independently of the zooplankton prey, including
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