Evidence for circadian-based photoperiodic timekeeping in Svalbard ptarmigan, the northernmost resident bird

Appenroth, Daniel; Wagner, Gabriela; Hazlerigg, David G.; West, Alexander C.

doi:10.1016/j.cub.2021.04.009

Cited by 14 publications

(12 citation statements)

References 49 publications

(44 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…"Extreme photic" environments, for instance, the subterranean, caves, poles and the deep sea are natural contexts that provide insights into the persistence of biological rhythms, as well as their synchronization by light/dark cycles (Lu et al, 2010;Duboué and Borowsky, 2012;Williams et al, 2014Williams et al, , 2016Beale et al, 2016). Particularly, organisms that inhabit atypical photic environments have revealed striking new aspects of seasonal regulation by light signals (Appenroth et al, 2021;Rajan et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Telling the Seasons Underground: The Circadian Clock and Ambient Temperature Shape Light Exposure and Photoperiodism in a Subterranean Rodent

et al. 2021

View full text Add to dashboard Cite

Living organisms anticipate the seasons by tracking the proportion of light and darkness hours within a day—photoperiod. The limits of photoperiod measurement can be investigated in the subterranean rodents tuco-tucos (Ctenomys aff. knighti), which inhabit dark underground tunnels. Their exposure to light is sporadic and, remarkably, results from their own behavior of surface emergence. Thus, we investigated the endogenous and exogenous regulation of this behavior and its consequences to photoperiod measurement. In the field, animals carrying biologgers displayed seasonal patterns of daily surface emergence, exogenously modulated by temperature. In the laboratory, experiments with constant lighting conditions revealed the endogenous regulation of seasonal activity by the circadian clock, which has a multi-oscillatory structure. Finally, mathematical modeling corroborated that tuco-tuco’s light exposure across the seasons is sufficient for photoperiod encoding. Together, our results elucidate the interrelationship between the circadian clock and temperature in shaping seasonal light exposure patterns that convey photoperiod information in an extreme photic environment.

show abstract

Section: Introductionmentioning

confidence: 99%

Telling the Seasons Underground: The Circadian Clock and Ambient Temperature Shape Light Exposure and Photoperiodism in a Subterranean Rodent

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Rock Ptarmigan has been utilized as food and traded since prehistory with human dispersal possible as early as the Viking age (McGovern et al, 2006), but in the last four decades of the modern era, birds from Svalbard have been regularly brought to a colony housed in Tromsø for research purposes (Stokkan, 1988). Already, Rock Ptarmigan hatched and raised in captivity have been used for gene expression studies to understand circadian rhythms and investigations of the cecal microbiome (Appenroth et al, 2021; Salgado-Flores et al, 2019). This represents a valuable opportunity for tailored future study.…”

Section: Discussionmentioning

confidence: 99%

A Chromosome-Level Genome Assembly for the Rock Ptarmigan (Lagopus muta)

Morch

Squires

Formenti

et al. 2023

Preprint

View full text Add to dashboard Cite

The Rock Ptarmigan (Lagopus muta) is a cold-adapted, largely sedentary, game bird with a Holarctic distribution. The species represents an important example of an organism likely to be affected by ongoing climatic shifts across a disparate range. We provide here a high-quality reference genome and mitogenome for the Rock Ptarmigan assembled from PacBio HiFi and Hi-C sequencing of a female bird from Iceland. The total size of the genome is 1.03 Gb with a scaffold N50 of 71.23 Mb and a contig N50 of 17.91 Mb. The final scaffolds represent all 40 predicted chromosomes, and the mitochondria with a BUSCO score of 98.6%. Gene annotation resulted in 16,078 protein-coding genes out of a total 19,831 predicted (81.08% excluding pseudogenes). The genome included 21.07% repeat sequences, and the average length of genes, exons, and introns were, 33605, 394, and 4265 bp respectively. The availability of a new reference-quality genome will contribute to understanding the Rock Ptarmigans unique evolutionary history, vulnerability to climate change, and demographic trajectories around the globe. As a wild relative of domesticated Galliformes, findings of avicultural importance may also be revealed.

show abstract

“…Second, apart from the PT, the hypothalamic nuclei of the MBH exhibit no (i.e., undetectable) mRNA encoding MT1 and these are likely “soaked” in high melatonin levels throughout the day 107 . Therefore, because seasonal timing is based upon accurate daily timing, orchestrated by a melatonin‐dependent circadian clock, 108,109 it is very unlikely that these nuclei could discriminate day from night and, consequently, long days from short days. Furthermore, a number of serious shortcomings associated with the use of melatonin binding assays, melatonin implants and electrolytic lesions, have been exposed and explained previously 15,42 …”

Section: Conclusion: the Pt As A Seasonal Hubmentioning

confidence: 99%

GnRHand the photoperiodic control of seasonal reproduction: Delegating the task to kisspeptin andRFRP‐3

Dardente

Simonneaux

2022

J Neuroendocrinology

View full text Add to dashboard Cite

Synchronization of mammalian breeding activity to the annual change of photoperiod and environmental conditions is of the utmost importance for individual survival and species perpetuation. Subsequent to the early 1960s, when the central role of melatonin in this adaptive process was demonstrated, our comprehension of the mechanisms through which light regulates gonadal activity has increased considerably. The current model for the photoperiodic neuroendocrine system points to pivotal roles for the melatonin-sensitive pars tuberalis (PT) and its seasonally-regulated production of thyroid-stimulating hormone (TSH), as well as for TSH-sensitive hypothalamic tan-

show abstract

Evidence for circadian-based photoperiodic timekeeping in Svalbard ptarmigan, the northernmost resident bird

Cited by 14 publications

References 49 publications

Telling the Seasons Underground: The Circadian Clock and Ambient Temperature Shape Light Exposure and Photoperiodism in a Subterranean Rodent

Telling the Seasons Underground: The Circadian Clock and Ambient Temperature Shape Light Exposure and Photoperiodism in a Subterranean Rodent

A Chromosome-Level Genome Assembly for the Rock Ptarmigan (Lagopus muta)

GnRHand the photoperiodic control of seasonal reproduction: Delegating the task to kisspeptin andRFRP‐3

Contact Info

Product

Resources

About