Early beak development in Argonauta Nodosa and Octopus Vulgaris (Cephalopoda: Incirrata) paralarvae suggests adaptation to different feeding mechanisms

Franco-Santos, Rita Melo; Iglesias, J.; Domíngues, Pedro; Vidal, Erica A. G.

doi:10.1007/s10750-013-1721-4

Cited by 17 publications

(5 citation statements)

References 27 publications

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“…In contrast, jaws with a calcareous covering and a robust radula, as found in nautilids, have been suggested to be suited for a scavenging life style. Moreover, some authors have suggested that the beaks of para‐larvae of recent octopods, argonauts and some squid show features that facilitate prey ingestion (Franco‐Santos et al, 2013; Franco‐Santos & Vidal, 2014, 2020). Moreover, diet can vary greatly during ontogeny in ommastrephid squid, ranging from detritivory in paralarvae to carnivory in adults (Fernández‐Àlvarez et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape

et al. 2022

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1. Beaks are among the few hard parts of coleoid cephalopods and are informative for species identification. Although mandible shape has been shown to be adaptive in many vertebrate taxa, it has been suggested that the shape of coleoid beaks does not bear any ecological signal. Yet, previous studies only explored beak shape in 2D and none have provided an in-depth investigation of the potential relationship with ecological variables such as habitat use or diet.2. The goal of the present study was to understand whether variation in cephalopod beak shape reflects ecology and/or is more driven by phylogenetic relatedness as suggested previously.3. We imaged 101 lower and 108 upper beaks in 3D using underwater photogrammetry and micro-CT scanning. Our 3D morphometric analysis conducted on 75 species of cephalopod shows that there is a significant but moderate phylogenetic signal. However, comparative phylogenetically informed analyses demonstrate that beak shape is also driven by ecology.4. We detected significant differences in beak shape between species inhabiting different habitats (pelagic, benthic or demersal) and of different trophic levels.Our results further suggest that beak shape variation can be summarized along a continuum between two main functions: fast closing versus hard biting.5. These results provide novel insights into the drivers of beak shape diversity in coleoid cephalopods and suggest that beak shape has evolved adaptively in relation to diet and habitat use.

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Section: Introductionmentioning

confidence: 99%

Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape

et al. 2022

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“…General beak appearance was similar to that described for similar sized O. vulgaris paralarvae reared in Vigo, Spain (Franco‐Santos et al . ), except for the absence of a small slit in the rostrum (whose protrusion is slightly less concave) in the LJ and a colouration pattern slightly more spread out in the hood region of both jaws.…”

Section: Resultsmentioning

confidence: 93%

“…In this study, only the UJ of O. vulgaris paralarvae was used for indentifying growth increments and stress marks because the LJ has very conspicuous teeth in the counting area (which makes it very difficult to identify and count increments), which is also shorter (anterior‐posterior axis) in the LJ. When considering species other than O. vulgaris , however, it must be considered that the level of rostrum development varies according to species (for examples on squid and octopod species, see Franco‐Santos & Vidal ; and Franco‐Santos, Iglesias, Domingues & Vidal , respectively) and that the structure might not be suitable for growth increment analysis.…”

Section: Methodsmentioning

confidence: 99%

Beak microstructure analysis as a tool to identify potential rearing stress forOctopus vulgarisparalarvae

et al. 2015

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Octopus vulgaris is a viable candidate for commercial aquaculture, but rearing procedures might stress individuals and result in diminished growth and survival. This study investigated the relationship between possible stress sources (tank transposition and syphoning) when rearing O. vulgaris paralarvae and the deposition pattern of growth increments in their beak microstructure. Light intensity at the facility was heterogeneous, and accounted for with an experimental design consisting of blocks without replicates. Growth and survival were estimated and possible effects of handling were tested for both parameters. Increments and stress marks were counted in 120 paralarval upper jaws (UJ), and the number of UJs with a mark on the day of stress application (day 8) was quantified. Differences in light intensity, diet quantity and total number of marks in the UJ were also compared between treatments. Growth and survival were statistically similar between treatments, although the control treatment showed a tendency for higher survival rates. Age at first increment deposition coincided with day 1 of experiment, and a 1 increment day À1 deposition rate was validated for the experiment duration. The number of stress marks was significantly different between the control and other treatments, indicating that handling might cause stress and that marks can be used as a biomarker for stress, although the occurrence of stress marks on day 8 was not significantly different. Light intensity and diet might have also been relevant stressors and confounded the results. The results herein presented are important for improving rearing conditions for O. vulgaris paralarvae.

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“…Descriptions of the paralarvae of A. hians (1.0 mm) are scarcer [11,43,44], where some authors describe2 + 2 in the funnel and in the VHCP [24], an arrangement of 4 chromatophores (rectangle shape) on the dorsal side of the head [26], and 4 + 4 in the DHCP [24,[40][41][42]. Although the paralarvae of Argonauta nodosus were reported by [45,46], there is no morphological description of them.…”

Section: Discussionmentioning

confidence: 99%

Species Delimitation of Argonauta Paralarvae Reveals an Extensive Morphological Variability in the Northern Humboldt Current System

Orosco,

Ayón,

Sotil

et al. 2024

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Argonauts or paper nautiluses are pelagic octopod cephalopods with a cosmopolitan distribution in tropical and subtropical waters around the world. Unlike other species of octopus, these are characterized by the fact that the female has a shell that serves as the breeding chamber for the eggs. Over time, this structure has been used as a taxonomic diagnostic character, causing problems in the systematics of this genus, with around 50 synonymies reported. Only two species, Argonauta argo and A. nouryi, have been reported in the Northern Humboldt Current System; however, there is taxonomic uncertainty regarding these species, which is reflected in the paralarvae (the first stage of life after hatching). In the paralarvae, the chromatophore patterns are considered to be conservative and reliable taxonomic characteristics. The objective of this study is to demonstrate the extensive variability in the chromatophore arrangement of Argonauta paralarvae in the Northern Humboldt Current using DNA barcoding and five species delimitation models. Our results include up to 11 different paralarvae morphotypes according to the pattern of chromatophores (number and arrangement) and 2 shell morphotypes. Species delimitation methods divided the 13 Argonauta morphotypes into two consensus molecular taxonomic units (MOTUs), A. argo and A. nouryi. Additionally, the results revealed an extensive morphological variability in the paralarvae and female shells of A. nouryi, demonstrating the importance of molecular data in studies involving species with different life stages, especially when this extensive morphological variability obscures conventional analyses.

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Early beak development in Argonauta Nodosa and Octopus Vulgaris (Cephalopoda: Incirrata) paralarvae suggests adaptation to different feeding mechanisms

Cited by 17 publications

References 27 publications

Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape

Every hooked beak is maintained by a prey: Ecological signal in cephalopod beak shape

Beak microstructure analysis as a tool to identify potential rearing stress forOctopus vulgarisparalarvae

Species Delimitation of Argonauta Paralarvae Reveals an Extensive Morphological Variability in the Northern Humboldt Current System

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