The effect of the photoperiod on the larval development and growth of two amphibian species (Amphibia: anura)

Ruchin, Alexander B.

doi:10.1080/09291016.2019.1631025

Cited by 6 publications

(4 citation statements)

References 35 publications

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“…As in other vertebrates, melatonin regulates pleiotropic actions in amphibians. It has been shown that photoperiod has an effect on the growth and the development of tadpoles ( 80 ), and administration of melatonin accelerates metamorphosis ( 81 ). Melatonin has been shown to be involved in the direct regulation of body blanching in axolotl and anuran tadpoles, a background adaptation response, resulting from the contraction of dermal melanophores in response to a dark environment.…”

Section: Discussionmentioning

confidence: 99%

New Insights Into the Evolutionary History of Melatonin Receptors in Vertebrates, With Particular Focus on Teleosts

2020

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In order to improve our understanding of melatonin signaling, we have reviewed and revised the evolutionary history of melatonin receptor genes (mtnr) in vertebrates. All gnathostome mtnr genes have a conserved gene organization with two exons, except for mtnr1b paralogs of some teleosts that show intron gains. Phylogeny and synteny analyses demonstrate the presence of four mtnr subtypes, MTNR1A, MTNR1B, MTNR1C, MTNR1D that arose from duplication of an ancestral mtnr during the vertebrate tetraploidizations (1R and 2R). In tetrapods, mtnr1d was lost, independently, in mammals, in archosaurs and in caecilian amphibians. All four mtnr subtypes were found in two non-teleost actinopterygian species, the spotted gar and the reedfish. As a result of teleost tetraploidization (3R), up to seven functional mtnr genes could be identified in teleosts. Conservation of the mtnr 3R-duplicated paralogs differs among the teleost lineages. Synteny analysis showed that the mtnr1d was conserved as a singleton in all teleosts resulting from an early loss after tetraploidization of one of the teleost 3R and salmonid 4R paralogs. Several teleosts including the eels and the piranha have conserved both 3R-paralogs of mtnr1a, mtnr1b, and mtnr1c. Loss of one of the 3R-paralogs depends on the lineage: mtnr1ca was lost in euteleosts whereas mtnr1cb was lost in osteoglossomorphs and several ostariophysians including the zebrafish. We investigated the tissue distribution of mtnr expression in a large range of tissues in medaka. The medaka has conserved the four vertebrate paralogs, and these are expressed in brain and retina, and, differentially, in peripheral tissues. Photoperiod affects mtnr expression levels in a gene-specific and tissue-specific manner. This study provides new insights into the repertoire diversification and functional evolution of the mtnr gene family in vertebrates.

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Section: Discussionmentioning

confidence: 99%

New Insights Into the Evolutionary History of Melatonin Receptors in Vertebrates, With Particular Focus on Teleosts

2020

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“…The most important secreta of the pineal organ is melatonin. It is the neuroendocrine transductor of changes in the photoperiodicity of the environment and plays a role in many aspects of the lower vertebrates’ biology (Falcón et al, 2010; Esteban et al, 2013; Ruchin, 2020d). Thus, the endocrine system can link light effects to changes in growth, reproduction, exchange and migration by releasing and accumulating hormones that mediate the effect of illumination on the ontogenesis of lower vertebrates.…”

Section: Physiological and Biochemical Aspects Of Exposure To Lightmentioning

confidence: 99%

Effect of illumination on fish and amphibian: development, growth, physiological and biochemical processes

Ruchin

2020

Reviews in Aquaculture

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Being one of the main environmental factors, the light factor influences many aspects of animal life. Photoperiod, light intensity (illumination) and wavelength are the primary periodic factors. There is a review that discusses the role of illumination on various life processes of aquatic anamnia vertebrates (fish and amphibians). The effect of light on the development, growth, respiration, consumption and efficiency of food conversion, hormone release, reproduction and behaviour of fish and amphibians has been studied. Illumination influences differently a significant number of physiological and biochemical processes and reactions of anamnia vertebrates at various development stages. The obtained results show that the nature of exposure to light is species-specific and corresponds to the ecological niche of species. Illumination influences both positively and negatively the development, growth and other physiological processes of fish and amphibians. Illumination plays a special role during the first feeding of fish in the environment and aquaculture. There are positive and negative behavioural responses of fish to light. However, it is not always possible to distinguish fish species with only a negative or only a positive reaction to light. The quality of the reaction can be influenced by the stage of development of eggs or larvae, age characteristics, feeding status, season, time, the physiological state of fish, morbidity, etc. A promising area of research is the study of the influence of light on the hormonal status of the body and reproduction of fish. Also, the light pollution and its influence on the physiology of anamnia vertebrates are important.

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“…For instance, exposure to contrasting photoperiods can have significant effects on growth and development. Studies on anurans revealed that longer photoperiods can accelerate development, leading to smaller body size at metamorphosis ( Wright et al, 1988 ; Ruchin, 2019 ), but overall, the mechanisms regulating photoperiodic responses and their consequences on organism life-history remain largely unknown. Emerging evidence suggests that surface organisms raised in darkness respond by lowering their metabolic rates ( Bilandžija et al., 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Food and light availability induce plastic responses in fire salamander larvae from contrasting environments

Băncilă,

Stănescu,

Plăiaşu

et al. 2023

PeerJ

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Phenotypic plasticity has been proposed as a mechanism facilitating the colonisation and adaptation to novel environments, such as caves. However, phenotypic plasticity in subterranean environments remains largely unexplored. Here, we test for plasticity in growth and development of fire salamander larvae (Salamandra salamandra) from subterranean and surface habitats, in response to contrasting food availability and light conditions. We hypothesized that: (i) low food availability and absence of light decrease larval growth and delay metamorphosis, (ii) light conditions mediate the effects of food availability on growth and time to metamorphosis, and (iii) larval response to contrasting light and food conditions is shaped by the habitat of origin. Our study showed that reduced food availability significantly delayed metamorphosis and slowed total length and body mass growth rates, while exposure to constant darkness slowed body mass growth rate. However, larvae slowed growth rates and increased time to metamorphosis without compromising size at metamorphosis. The effect of food availability on growth and time to metamorphosis did not change under different light conditions. Fire salamanders from subterranean and surface habitats responded differently only in relation to contrasting food availability conditions. Specifically, larvae from the surface habitat grew faster in high food conditions, while growth in larvae from the subterranean habitat was not influenced by food availability. Initial size also appeared to be an influential factor, since larger and heavier larvae grew slower, metamorphosed faster, and the size advantage was maintained in newly-metamorphosed juveniles. Overall, the results of our experiment suggest that plasticity and local adaptation favor the exploitation of aquatic subterranean habitats for breeding by fire salamanders, allowing successful development even under food shortage and day-length constraints, without compromising metamorphic size. Our findings have implications for conservation because they confirm that phenotypic plasticity plays a critical role in allowing fire salamanders to overcome altered environmental conditions.

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The effect of the photoperiod on the larval development and growth of two amphibian species (Amphibia: anura)

Cited by 6 publications

References 35 publications

New Insights Into the Evolutionary History of Melatonin Receptors in Vertebrates, With Particular Focus on Teleosts

New Insights Into the Evolutionary History of Melatonin Receptors in Vertebrates, With Particular Focus on Teleosts

Effect of illumination on fish and amphibian: development, growth, physiological and biochemical processes

Food and light availability induce plastic responses in fire salamander larvae from contrasting environments

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