Principles underlying chromatophore addition during maturation in the European cuttlefish, <i>Sepia officinalis</i>

Yacob, Jarred; Lewis, Alexandra Cosima; Gosling, Allyson; Hilaire, Debra H. J. St; Tesar, Lindsay; McRae, Michelle; Tublitz, Nathan J.

doi:10.1242/jeb.055251

Cited by 13 publications

(13 citation statements)

References 22 publications

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“…Chromatophores (i) do not disappear32 and (ii) their colour ratio (light/dark) is roughly constant (1.06±0.19:1 in seven 8-252 day-old animals) 33. However, (iii) the time over which chromatophores turn from light to dark increased from ~19 days (above) to ~97 days in a 105-day-old animal (96.6±9.3 days, s.e.m., Methods).…”

Section: Tracking Array Developmentmentioning

confidence: 99%

Elucidating the control and development of skin patterning in cuttlefish

Reiter

Hülsdunk

Woo

et al. 2018

Nature

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Summary Few animals provide as objective a readout of their perceptual state as camouflaging cephalopods. Their skin display system includes an extensive array of pigment cells (chromatophores), each activated by radial muscles controlled by motoneurons. If one could track the individual expansion states of the chromatophores, one would obtain a quantitative description—and potentially even, a neural description by proxy— of the perceptual state of the animal in real time. We developed computational and analytical methods to achieve this in behaving animals, quantifying the state of tens of thousands of chromatophores at sixty frames per second, single-cell resolution, and over weeks. We could infer a statistical hierarchy of motor control, reveal an underlying low-dimensional structure to pattern dynamics, and uncover rules governing skin pattern development. This approach provides an objective description of complex perceptual behaviour, and powerful means to uncover organizational principles underlying neural systems function, dynamics, and morphogenesis.

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Section: Tracking Array Developmentmentioning

confidence: 99%

Elucidating the control and development of skin patterning in cuttlefish

Reiter

Hülsdunk

Woo

et al. 2018

Nature

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“…Descriptions of the natural course of wound healing following skin damage to the dorsal mantle in E. cirrhosa can be found in Polglase et al 189 Authors also found that bacterial infection of a mantle wound impairs healing. 210 Healing and regeneration of the fin dermis in S. officinalis is described by Yacob et al 427 and regeneration of the mantle connective in several species of octopus by Sereni and Young. 428 The arms in cephalopods have a remarkable capacity to heal and regenerate when a segment is removed by transection with the histological changes described in detail in O. vulgaris, E. cirrhosa, S. officinalis and S. pharaonis 190,[429][430][431] In O. vulgaris following transection of the distal 10% of the length of the arm as part of study to investigate regeneration, the exposed area was almost completely covered by skin in about 24 hours in some animals (T. Shaw and P. Andrews, unpublished data).…”

Section: 63mentioning

confidence: 99%

Guidelines for the Care and Welfare of Cephalopods in Research –A consensus based on an initiative by CephRes, FELASA and the Boyd Group

et al. 2015

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This paper is the result of an international initiative and is a first attempt to develop guidelines for the care and welfare of cephalopods (i.e. nautilus, cuttlefish, squid and octopus) following the inclusion of this Class of ∼700 known living invertebrate species in Directive 2010/63/EU. It aims to provide information for investigators, animal care committees, facility managers and animal care staff which will assist in improving both the care given to cephalopods, and the manner in which experimental procedures are carried out. Topics covered include: implications of the Directive for cephalopod research; project application requirements and the authorisation process; the application of the 3Rs principles; the need for harm-benefit assessment and severity classification. Guidelines and species-specific requirements are provided on: i. supply, capture and transport; ii. environmental characteristics and design of facilities (e.g. water quality control, lighting requirements, vibration/noise sensitivity); iii. accommodation and care (including tank design), animal handling, feeding and environmental enrichment; iv. assessment of health and welfare (e.g. monitoring biomarkers, physical and behavioural signs); v. approaches to severity assessment; vi. disease (causes, prevention and treatment); vii. scientific procedures, general anaesthesia and analgesia, methods of humane killing and confirmation of death. Sections covering risk assessment for operators and education and training requirements for carers, researchers and veterinarians are also included. Detailed aspects of care and welfare requirements for the main laboratory species currently used are summarised in Appendices. Knowledge gaps are highlighted to prompt research to enhance the evidence base for future revision of these guidelines.

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“…Cuttlefish is a cephalopods type which is outstanding for its color change capacities for either apparently vanishes into its environment or to deliver stunning displays. By various layers of cells in cephalopods the patterns and colors seen are delivered . The distinctive layers are chromatophores, leucophores, and iridophores.…”

Section: Formulation For Opposition Cfomentioning

confidence: 99%

“…By various layers of cells in cephalopods the patterns and colors seen are delivered. 31 The distinctive layers are chromatophores, leucophores, and iridophores. These are the combination of specific cells operations of reflecting light and matching patterns.…”

Section: Simple Cfomentioning

confidence: 99%

New opposition cuttlefish optimizer based two‐step approach for optimal design of fractional order proportional integral derivative controller for time delay systems

Sumathi¹,

Umasankar²

2019

Int J Numerical Modelling

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In this article, an optimal design of the fractional order proportional integral derivative (FOPID) controller for time delay system is proposed. The proposed optimal design is the combined performance of both the cuttlefish optimizer (CFO) and Opposition-based learning (OBL) scheme called CFOBL scheme. The proposed CFOBL uses the concept of opposition based population initialization and opposition based position updating to improve its searching behavior, computational speed and convergence profile in the basic CFO. In FOPID controller, apart from the three tuning parameters (G P , G I , and G D ) there are two additional tuning parameters that are λ and μ. Here, CFOBL is used to tune the three controller parameters and also to find the optimal values of λ and μ. The uniqueness of the proposed technique is to reduce the FOPID controller's fault in the higher order time delay scheme by the aid of the controller's increase limits. The objective of the proposed technique is chosen by considering the set point parameters and the accomplished parameters from the time delay system. The proposed technique is used to avoid high-order delays and reliability constraints such as small overruns, time resolution and fixed condition defects. This technique is performed on the MATLAB/ Simulink platform and the results are compared with different existing techniques such as Ziegler-Nichols (ZN) tuning method, curve fitting (CF) technique, Wang technique, and regression technique. K E Y W O R D Scuttlefish optimizer, FOPID controller, opposition based two-step approaches, reliability constraints, time delay system

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Principles underlying chromatophore addition during maturation in the European cuttlefish, Sepia officinalis

Cited by 13 publications

References 22 publications

Elucidating the control and development of skin patterning in cuttlefish

Elucidating the control and development of skin patterning in cuttlefish

Guidelines for the Care and Welfare of Cephalopods in Research –A consensus based on an initiative by CephRes, FELASA and the Boyd Group

New opposition cuttlefish optimizer based two‐step approach for optimal design of fractional order proportional integral derivative controller for time delay systems

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