ALTITUDINAL VARIATION IN THE AGE AT MATURITY, LONGEVITY, AND REPRODUCTIVE LIFESPAN OF ANURANS IN SUBTROPICAL QUEENSLAND

I compared adult size and sea age at sexual maturity among nine populations of anadromous brown trout, Salmo trutta, in two Norwegian rivers to determine the extent of inter- and intrariverine variations. Variation in the mean length of spawners and in the mean sea age at sexual maturity were mainly dependent on the variations found within rather than between rivers. Mean lengths and mean age at maturity of males increased significantly with increasing altitude of the spawning area and with migration distance in freshwater. In females, positive significant correlations were found with mean lengths and altitude of the spawning area and with mean sea age at maturity and both spawning site altitude and migration distance. Mean lengths and ages of males and females were not significantly correlated with the rate of water discharge in the streams during spawning. The size of gravel substrate for spawning was of minor importance in explaining interpopulation variation in mean female size. The increase noted in mean length and in mean sea age at maturity of both males and females is probably an adaptation to greater energy expenditure to reach the uppermost natal spawning areas.

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Growth, Age at Maturity, and Age-Specific Survival of the Arboreal Salamander (Aneides lugubris) on Southeast Farallon Island, California

Journal of Herpetology ◽

10.1670/10-282 ◽

2012 ◽

Vol 46 (1) ◽

pp. 64-71 ◽

Cited By ~ 9

Author(s):

Derek E. Lee ◽

James B. Bettaso ◽

Monica L. Bond ◽

Russell W. Bradley ◽

James R. Tietz ◽

...

Keyword(s):

Age At Maturity

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Altitudinal Variation of Phenolic Contents in Flowering Heads of Arnica montana cv. ARBO: a 3-Year Comparison

Journal of Chemical Ecology ◽

10.1007/s10886-007-9407-x ◽

2008 ◽

Vol 34 (3) ◽

pp. 369-375 ◽

Cited By ~ 51

Author(s):

Renate Spitaler ◽

Andrea Winkler ◽

Isabella Lins ◽

Sema Yanar ◽

Hermann Stuppner ◽

...

Keyword(s):

Altitudinal Variation ◽

Arnica Montana ◽

Phenolic Contents

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Altitudinal Variation in Parental Provisioning of Nestling Varied Tits (Poecile varius)

The Wilson Journal of Ornithology ◽

10.1676/10-106.1 ◽

2011 ◽

Vol 123 (2) ◽

pp. 283-288 ◽

Cited By ~ 9

Author(s):

Jong Koo Lee ◽

Ok-Sik Chung ◽

Woo-Shin Lee

Keyword(s):

Altitudinal Variation ◽

Parental Provisioning ◽

Poecile Varius

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Age determination and growth of orange roughy (Hoplostethus atlanticus): a comparison of annulus counts with radiometric ageing

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f95-041 ◽

1995 ◽

Vol 52 (2) ◽

pp. 391-401 ◽

Cited By ~ 58

Author(s):

David C. Smith ◽

Simon G. Robertson ◽

Gwen E. Fenton ◽

Stephen A. Short

Keyword(s):

Age Determination ◽

Percentage Reduction ◽

Age At Maturity ◽

Otolith Growth ◽

Two Stage ◽

Orange Roughy ◽

Mass Growth ◽

Hoplostethus Atlanticus ◽

Age Estimates ◽

Radiometric Data

Ages of orange roughy (Hoplostethus atlanticus) determined by two methods (counting annuli on the surface of whole and in longitudinally sectioned otoliths) were similar up to maturity. Beyond maturity, age estimates from sectioned otoliths exceeded those from whole otoliths. Maximum recorded age was 125 years for an individual 41 cm standard length (SL), and age at maturity was estimated to be 25 years (30–32 cm SL). These are consistent with ages estimated previously by radiometric methods. Results demonstrated a two-stage linear relationship between otolith weight and age that confirmed the two-stage otolith mass growth model previously used in radiometric ageing. However, in the radiometric analyses the reduction in otolith growth was arbitrarily estimated at 45% of the immature rate whereas annuli data demonstrated a reduction after maturity to 62% of the immature rate. The new estimates of otolith mass growth rate were incorporated into the radiometric data and ages recalculated, which reduced age estimates for 38–40 cm SL fish from 77–149 to 59–101 years. The radiometric data were also recalculated using only the percentage reduction in otolith growth after maturity, giving the radiometric age of 125 ± 9 years for the oldest fish.

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