Seasonal changes in thyroid activity in the lesser snow goose (Anser caerulescens caerulescens) including reference to embryonic thyroid activity

Plasma thyroxine (T4) levels in adult lesser snow geese (Anser caerulescens caerulescens) increased concomitantly with gonadal recrudescence and remained elevated until shortly before moult. This pattern of declining plasma T4 concentrations preceding moult was evident in gosling, yearling, and adult birds. Plasma triiodothyronine (T3) concentrations did not change significantly throughout the year. There was no apparent correlation between plasma thyroid hormone levels and thyroid weight or thyroid epithelial cell height. Plasma levels of both T3 and T4 increased in goslings shortly before hatch and on day 20 of incubation reached levels (0.58 ± 0.36 and 19.5 ± 2.5 ng∙mL−1, respectively) similar to those found in the plasma of newly hatched birds (0.76 ± 0.24 and 36.0 ± 6.5, respectively).

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A comparison of drone imagery and ground-based methods for estimating the extent of habitat destruction by lesser snow geese (Anser caerulescens caerulescens) in La Pérouse Bay

PLoS ONE ◽

10.1371/journal.pone.0217049 ◽

2019 ◽

Vol 14 (8) ◽

pp. e0217049 ◽

Cited By ~ 3

Author(s):

Andrew F. Barnas ◽

Brian J. Darby ◽

Gregory S. Vandeberg ◽

Robert F. Rockwell ◽

Susan N. Ellis-Felege

Keyword(s):

Habitat Destruction ◽

Snow Geese ◽

Lesser Snow Geese ◽

Anser Caerulescens Caerulescens ◽

Anser Caerulescens

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BREEDING SYNCHRONY IN THE LESSER SNOW GOOSE (ANSER CAERULESCENS CAERULESCENS)

Evolution ◽

10.1111/j.1558-5646.1982.tb05050.x ◽

1982 ◽

Vol 36 (2) ◽

pp. 342-351 ◽

Cited By ~ 1

Author(s):

C. Scott Findlay ◽

Fred Cooke

Keyword(s):

Snow Goose ◽

Breeding Synchrony ◽

Anser Caerulescens Caerulescens ◽

Lesser Snow Goose ◽

Anser Caerulescens

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Correlation of laying and hatching sequences in clutches of the lesser snow goose (Anser caerulescens caerulescens)

Canadian Journal of Zoology ◽

10.1139/z81-171 ◽

1981 ◽

Vol 59 (7) ◽

pp. 1201-1204 ◽

Cited By ~ 14

Author(s):

Susan M. Cargill ◽

Fred Cooke

Keyword(s):

Snow Goose ◽

Stage Of Development ◽

Asynchronous Hatching ◽

Anser Caerulescens Caerulescens ◽

Laying Sequence ◽

Lesser Snow Goose ◽

Anser Caerulescens

Lesser snow goose nests were monitored daily during laying and hatching. Within each clutch, eggs were numbered serially as they were laid. Subsequently, the order of hatching within clutches was determined. In nests where three to five eggs hatched, the sequence of hatching was strongly dependent on the laying sequence. This implies that some development of embryos occurred throughout the laying period, so that the young varied in the stage of development attained prior to the onset of incubation. This inequality persisted until hatching, resulting in the observed asynchrony. Evidence from other workers suggests that development during laying occurs in some other waterfowl species, but does not necessarily result in asynchronous hatching or correlation of hatching and laying sequences.

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Seasonal changes in plasma prolactin concentration and carcass lipid levels in the lesser snow goose (Anser caerulescens caerulescens)

Comparative Biochemistry and Physiology Part A Physiology ◽

10.1016/0300-9629(81)90373-x ◽

1981 ◽

Vol 68 (4) ◽

pp. 653-657 ◽

Cited By ~ 13

Author(s):

R.R Campbell ◽

R.J Etches ◽

J.F Leatherland

Keyword(s):

Seasonal Changes ◽

Plasma Prolactin ◽

Lipid Levels ◽

Snow Goose ◽

Anser Caerulescens Caerulescens ◽

Lesser Snow Goose ◽

Anser Caerulescens

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Comparative indexes of thyroid function in sheep

American Journal of Physiology-Legacy Content ◽

10.1152/ajplegacy.1961.201.5.819 ◽

1961 ◽

Vol 201 (5) ◽

pp. 819-822 ◽

Cited By ~ 11

Author(s):

T. M. Hoersch ◽

H. E. Henderson ◽

E. P. Reineke ◽

H. A. Henneman

Keyword(s):

Thyroid Function ◽

Hormone Secretion ◽

Secretion Rate ◽

Half Time ◽

Thyroid Activity ◽

Height Measurement ◽

Cell Height ◽

Thyroid Epithelial Cell ◽

Thyroid Secretion ◽

Zero Time

The effects of light and temperature on thyroid activity of sheep were assessed by four methods: thyroid secretion rate, zero time per cent uptake of I131, I131 output half-time, and measurement of the thyroid epithelial cell height. Increased ambient temperature inhibited thyroid activity as evaluated by all methods. Reduced temperatures consistently resulted in a depressed uptake of I131. I131 output half-time had no relationship with actual hormone secretion. Light alterations imposed the same trend on thyroid function when activity was assessed by secretion rate and cell height measurement. As evaluated by these two methods the lowest thyroid activity was observed at 12 hr of illumination per day and increased with both increasing and decreasing light beyond this 1:1 light-to-dark ratio. When the three isotopic measures of thyroid activity were correlated with the histological method the highest correlation was found between cell height and thyroid secretion.

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