Circulating leptin levels do not reflect the amount of body fat in the dunlin Calidris alpina during migration

Gogga, Patrycja; Karbowska, Joanna; Kochan, Zdzisław; Meissner, Włodzimierz

doi:10.1016/j.ygcen.2013.04.001

Cited by 11 publications

(8 citation statements)

References 60 publications

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“…Although plasma MLA in domestic, agricultural avian species has been linked to endogenous fat stores and body mass (Lõhmus & Sundström, 2004;Lõhmus et al, 2006, we found that in pre-recruiting and RFG eider females, body mass, and plasma MLA were not correlated. This is consistent with findings in other wild avian species (Kordonowy et al, 2010;Quillfeldt et al, 2009) which often report that plasma MLA levels are often disassociated with body mass in life history stages that require fattening (e.g., migration: Townsend, Kunz, & Widmaier, 2008;Gogga, Karbowska, Kochan, & Meissner, 2013). Considering that pre-laying common eiders are in a life history stage in which they must obtain a substantial amount of endogenous fat resources quickly, plasma MLA levels may therefore be disassociated with body mass, thus explaining the lack of both correlation and interactive effects in all of our analyses.…”

Section: Variation In Plasma Mammalian Leptin Analoguesupporting

confidence: 91%

Plasma mammalian leptin analogue predicts reproductive phenology, but not reproductive output in a capital‐income breeding seaduck

Hennin

Legagneux

Gilchrist

et al. 2019

Ecology and Evolution

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To invest in energetically demanding life history stages, individuals require a substantial amount of resources. Physiological traits, particularly those related to energetics, can be useful for examining variation in life history decisions and trade‐offs because they result from individual responses to environmental variation. Leptin is a protein hormone found in mammals that is proportional to the amount of endogenous fat stores within an individual. Recently, researchers have confirmed that a mammalian leptin analogue (MLA), based on the mammalian sequence of leptin, is present with associated receptors and proteins in avian species, with an inhibitory effect on foraging and body mass gain at high circulating levels. While MLA has been both quantified and manipulated in avian species, little is currently known regarding whether plasma MLA in wild‐living species and individuals is associated with key reproductive decisions. We quantified plasma MLA in wild, Arctic‐nesting female common eiders (Somateria mollissima) at arrival on the breeding grounds and followed them to determine subsequent breeding propensity, and reproductive phenology, investment, and success. Common eiders are capital‐income breeding birds that require the accumulation of substantial fat stores to initiate laying and successfully complete incubation. We found that females with lower plasma MLA initiated breeding earlier and in a shorter period of time. However, we found no links between plasma MLA levels and breeding propensity, clutch size, or reproductive success. Although little is still known about plasma MLA, based on these results and its role in influencing foraging behaviors and condition gain, plasma MLA appears to be closely linked to reproductive timing and is therefore likely to underlie trade‐offs surrounding life history decisions.

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Section: Variation In Plasma Mammalian Leptin Analoguesupporting

confidence: 91%

Plasma mammalian leptin analogue predicts reproductive phenology, but not reproductive output in a capital‐income breeding seaduck

Hennin

Legagneux

Gilchrist

et al. 2019

Ecology and Evolution

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“…To be 400 further fattening is of ecological relevance and thus of evolutionary benefit. This is the 414 case in bats fattening for hibernation [15] and in birds fattening for migration [9]. Our20 study is the first one which finds support that this is also the case in small mammals 416 surviving drought periods characterized by low food availability.…”

Section: Discussion 366supporting

confidence: 56%

“…In bats, which increase adipose tissue before hibernating, 74 leptin levels can be dissociated from adipose tissue, such that the appetite reducing 75 signal of leptin might be absent during the fattening period [15]. Also in migratory birds, 76 which often have high fat stores, no correlation between adipose tissue and leptin was 77 found [9]. In sum, several field studies were opposing the general assumption that leptin 78 is positively correlated with adipose tissue (Tab.…”

mentioning

confidence: 99%

Leptin levels in free ranging striped mice (Rhabdomys pumilio) increase when food decreases: the ecological leptin hypothesis

Schradin

Raynaud

Arrivé

et al. 2014

General and Comparative Endocrinology

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“…Una característica de la secuencia de la leptina del pollo es que esta presenta solamente 145 aminoácidos en lugar de 146 aminoácidos que tiene la secuencia en los mamíferos (Taouis et al, 1998;Ashwel et al, 1999;Taouis et al, 2001). Con relación al gen de leptina aviar existen controversias; sin embargo, se ha demostrado que existe un receptor funcional de leptina aviar, y se ha confirmado su capacidad para unir leptinas de diferentes vertebrados (Gogga et al, 2013).…”

Section: Discussionunclassified

Niveles de leptina sérica en aves comerciales

Osório

Castañeda

2019

Rev. investig. vet. Perú

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El objetivo del estudio fue determinar los niveles de leptina en pollos y gallinas ponedoras mediante el uso de un kit para uso de muestras de humano. Se colectaron muestras de sangre en ayunas de 80 pollos de engorde de la línea Cobb 500 de 4 semanas (40 hembras y 40 machos) y de 86 gallinas de 26 semanas (43 Lohmann Brown y 43 Hy-line). Se determinaron los niveles de leptina mediante inmunoensayo enzimático tipo sandwich, previa validación del kit para su uso en aves comerciales. Los valores promedio, mínimo, máximo y desviación estándar de leptina para pollos de engorde fueron de 0.61, 0.12, 3.99 y 0.10 ng/ml, respectivamente, sin diferencia significativa entre sexos. Las gallinas ponedoras reportaron valores promedio mínimo, máximo y desviación estándar de 0.66, 0.16, 1.83 y 0.11 ng/ml, respectivamente, sin diferencia significativa entre líneas. En forma similar, tampoco se encontró diferencia estadística entre pollos de engorde y gallinas ponedoras. Los resultados del estudio indican que los valores de referencia para leptina en pollos y gallinas son de 0.63 ng/ml; asimismo, que pueden ser medidos en aves comerciales mediante el uso del kit humano.

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Circulating leptin levels do not reflect the amount of body fat in the dunlin Calidris alpina during migration

Cited by 11 publications

References 60 publications

Plasma mammalian leptin analogue predicts reproductive phenology, but not reproductive output in a capital‐income breeding seaduck

Plasma mammalian leptin analogue predicts reproductive phenology, but not reproductive output in a capital‐income breeding seaduck

Leptin levels in free ranging striped mice (Rhabdomys pumilio) increase when food decreases: the ecological leptin hypothesis

Niveles de leptina sérica en aves comerciales

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