A comparison of the effect of long daily photoperiods on the pattern of energy storage in migratory and non-migratory finches

Farner, Donald S.; Oksche, A.; Kamemoto, Fred I.; King, James R.; Cheyney, H.E.

doi:10.1016/0010-406x(61)90144-x

Cited by 121 publications

(17 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has long been known that photostimulation from mid-winter through spring can increase M b , lipid stores and migratory restlessness associated with the development of the migratory disposition in captive darkeyed juncos (Wolfson, 1952;Eyster, 1954;Farner et al, 1961;Johnston, 1962). Holberton et al (Holberton et al, 2007;Holberton et al, 2008) photostimulated captive juncos in mid-winter or early spring and found that M b and fat stores increased rapidly upon photostimulation, with significant increases within 5-15 days and continued elevation for the duration of the 29-47 day photostimulation treatments.…”

Section: Discussionmentioning

confidence: 99%

“…Photoperiod may also indirectly induce summer to winter metabolic variation, and if so, then trait values should be higher in SD birds than in LD birds for any given temperature, and cold SD birds should show the highest trait values and warm LD birds the lowest trait values. However, induction of migratory disposition in winter juncos by LD photoperiods has long been known (Wolfson, 1952;Eyster, 1954;Farner et al, 1961;Johnston, 1962), and migratory condition often increases Ṁ sum , flight muscle masses and cellular metabolic intensity in birds (Swanson, 2010;Piersma and van Gils, 2011). Thus, if exposure to LD induces migratory disposition, an alternative hypothesis is that LD birds may show higher trait values than SD birds within temperature treatments, with cold LD birds having the highest and warm SD birds the lowest trait values.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Relative roles of temperature and photoperiod as drivers of metabolic flexibility in dark-eyed juncos

Swanson

Zhang

Liu

et al. 2014

Journal of Experimental Biology

View full text Add to dashboard Cite

Seasonal phenotypic flexibility in small birds produces a winter phenotype with elevated maximum cold-induced metabolic rates (=summit metabolism, Ṁ sum ). Temperature and photoperiod are candidates for drivers of seasonal phenotypes, but their relative impacts on metabolic variation are unknown. We examined photoperiod and temperature effects on Ṁ sum , muscle masses and activities of key catabolic enzymes in winter dark-eyed juncos (Junco hyemalis). We randomly assigned birds to four treatment groups varying in temperature (cold=3°C; warm=24°C) and photoperiod [short day (SD)=8 h:16 h light:dark; long day (LD)=16 h:8 h light:dark] in a two-by-two design. We measured body mass (M b ), flight muscle width and Ṁ sum before and after 3 and 6 weeks of acclimation, and flight muscle and heart masses after 6 weeks. Ṁ sum increased for cold-exposed, but not for warm-exposed, birds. LD birds gained more M b than SD birds, irrespective of temperature. Flight muscle size and mass did not differ significantly among groups, but heart mass was larger in cold-exposed birds. Citrate synthase, carnitine palmitoyl transferase and β-hydroxyacyl Co-A dehydrogenase activities in the pectoralis were generally higher for LD and cold groups. The coldinduced changes in Ṁ sum and heart mass parallel winter changes for small birds, but the larger M b and higher catabolic enzyme activities in LD birds suggest photoperiod-induced changes associated with migratory disposition. Temperature appears to be a primary driver of flexibility in Ṁ sum in juncos, but photoperiod-induced changes in M b and catabolic enzyme activities, likely associated with migratory disposition, interact with temperature to contribute to seasonal phenotypes.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relative roles of temperature and photoperiod as drivers of metabolic flexibility in dark-eyed juncos

Swanson

Zhang

Liu

et al. 2014

Journal of Experimental Biology

View full text Add to dashboard Cite

show abstract

“…In a group of 26 d old chicks which were starved for 5 d, liver fat was reduced by on average 81% compared to a control group, but fat accounted for only 0.17 g or 13.4% of the total reduction of liver dry mass by 1.27 g. Concluding from data on small passerines by Baggott (1977), liver glycogen depots amount to less than one per cent of the total liver weight, and can only account for a negligible proportion of such weight losses which are of a magnitude by far exceeding the well-known diel and seasonal variations in liver weights reported in several studies (e.g. Oakeson 1953, Fisher and Bartlett 1957, Farner et al 1961, Baggott 1977. Hanson (1962) has pointed out that a reduction of liver mass occurs during situations of metabolic stress, and has shown that liver weights are remarkably low in female Canada Geese during the period of egg-laying.…”

Section: Authormentioning

confidence: 84%

“…Concluding from data on small passerines by Farner et al (1961) the carbohydrate reserves are comparatively small amounting to only one per cent or less of the total weight (cf. Newton 1968) and are used up quickly.…”

Section: Summary and Discussionmentioning

confidence: 98%

Weights and Fat in Lapwings Vanellus vanellus and Oystercatchers Haematopus ostralegus Starved to Death during a Cold Spell in Spring

Marcström¹,

Mascher²

1979

Ornis Scandinavica

View full text Add to dashboard Cite

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. . Wiley and Nordic Society Oikos are collaborating with JSTOR to digitize, preserve and extend access to Ornis Scandinavica. Weights and fat in Lapwings Vanellus vanellus and Oystercatchers Haematopus ostralegus starved to death during a cold spell in spring Vidar Marcstrom, Jan W. Mascher Marcstr6m, V. and Mascher, J. W. 1979. Weights and fat in Lapwings Vanellus vanellus and Oystercatchers Haematopus ostralegus starved to death during a cold spell in spring. -Ornis Scand. 10: 235-240.Weights and fat levels in body and liver in six Lapwings and six Oystercatchers starved to death during a cold spell in spring were investigated. Compared with control groups the starved Lapwings and Oystercatchers had 46 and 38% lower total weights respectively. Fat-free dry weights were 45 and 35% lower whereas body fat was drastically reduced by 92 and 91% in the starved groups. Proportional water content was remarkably constant, 71-72% in both species and in normal as well as starved birds. There was an appreciable reduction of dry liver mass which only to a minor part depended on a depletion of liver fat. The reduction of total fat-free dry body is supposed to depend mainly on a mobilization of muscle protein as an energy source when the fat depots are depleted. The reduction of liver dry mass is partly unexplained. It is inferred that such drastic emaciation in birds is uncompatible with life even if environmental conditions are changed before the death of the birds.V. Marcstr6m,

show abstract

“…Farner et al, 1961) and various lower vertebrates (cf. Vague and Fenasse, 1965) the liver contains very high amounts of lipids (e.g.…”

Section: B Evidence Of the Functional Autonomy Of The D-cellsmentioning

confidence: 99%

Comparative Studies on the Pancreatic Islets

Epple

1968

Endocrinol Japon

View full text Add to dashboard Cite

A comparison of the effect of long daily photoperiods on the pattern of energy storage in migratory and non-migratory finches

Cited by 121 publications

References 35 publications

Relative roles of temperature and photoperiod as drivers of metabolic flexibility in dark-eyed juncos

Relative roles of temperature and photoperiod as drivers of metabolic flexibility in dark-eyed juncos

Weights and Fat in Lapwings Vanellus vanellus and Oystercatchers Haematopus ostralegus Starved to Death during a Cold Spell in Spring

Comparative Studies on the Pancreatic Islets

Contact Info

Product

Resources

About