Adolescent growth and development in Japanese macaques (Macaca fuscata): Punctuated adolescent growth spurt by season

Hamada, Yohei; Hayakawa, Seiji; Suzuki, Juri; Ohkura, Satoshi

doi:10.1007/bf02557580

Cited by 27 publications

(25 citation statements)

References 16 publications

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“…Time series analysis was employed to decompose the hormonal changes to the factors mentioned above. Hamada et al previously reported that long-term changes in body weight involve a seasonal component in Japanese macaques using the pseudo-velocity curve fitting method [23]. Their analysis of body weight changes is consistent with the present time series analysis, suggesting that our method is applicable to other long-term changes in Japanese macaques, such as hormonal changes.…”

Section: Discussionsupporting

confidence: 88%

“…Taken together, these indicate that testosterone may play a role in regulating the seasonal change in body weight by affecting IGF-1 secretion. On the other hand, our previous study with the pseudo-velocity curve of height in the same subjects as used in the present study revealed that the adolescent spurt is most accelerated in the spring of age 4 [23]. The present results obtained by time series analysis on IGF-1 secretion in the male are consistent with the above-mentioned result.…”

Section: Figsupporting

confidence: 92%

“…This reproductive seasonality would presumably affect the timing of sexual maturation [20] as well as body growth. Our previous study on the morphological growth of the Japanese macaque by the long-term longitudinal method demonstrated that its adolescent growth is characterized by slowness and late start, resulting from adaptation to highly seasonal environment in a temperate zone [23].…”

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confidence: 99%

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Time Series Analysis of Plasma Insulin-like Growth Factor-I and Gonadal Steroids in Adolescent lapanese Macaques (Macaca fuscata).

Suzuki

Ohkura

Hayakawa

et al. 2000

Journal of Reproduction and Development

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Abstract. The present study was conducted to reveal the developmental changes in plasma IGF-1 concentrations in male and female Japanese macaques by a long-term longitudinal method from 3 to 6 years of age. The sexual maturation and reproductive seasonality in both genders were determined by plasma profiles of gonadal steroids, such as testosterone and progesterone. Since Japanese macaques have been known to have a rather unique characteristic of clear seasonality in reproduction, the present study introduced a time series analysis to extract two factors -seasonal and age changes-from the changes in plasma hormonal levels. Plasma IGF-1 concentrations showed seasonal and age-development changes in males. Plasma IGF-1 levels were high in summer and low in spring. Age-dependent changes would be superimposed on the seasonal change, because the IGF-1 levels of 4-and 5-year-old males were nearly twice as high as those of 3-year-old males in every corresponding season. Females, on the other hand, did not have clear age-dependent changes in the plasma IGF-1 level. The time series analysis suggests a close functional relationship between IGF-1 and testosterone secretion in regulating skeletal growth and seasonal changes in body weight.

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Section: Discussionsupporting

confidence: 88%

Section: Figsupporting

confidence: 92%

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confidence: 99%

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Time Series Analysis of Plasma Insulin-like Growth Factor-I and Gonadal Steroids in Adolescent lapanese Macaques (Macaca fuscata).

Suzuki

Ohkura

Hayakawa

et al. 2000

Journal of Reproduction and Development

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“…In cercopithecoids with highly dimorphic canines, canine eruption is typically delayed in males, beginning after the age of eruption in females (28) and apparently corresponding with species-specific patterns of body size growth spurts (29)(30)(31). Once male canine eruption is initiated, it then proceeds at a higher rate than in females, but it can still last for several years depending on species (31).…”

Section: Paleobiological Implications Of the Ardipithecus Ramidus Denmentioning

confidence: 99%

Paleobiological Implications of the Ardipithecus ramidus Dentition

Suwa

Kono

Simpson

et al. 2009

Science

178

194

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The Middle Awash Ardipithecus ramidus sample comprises over 145 teeth, including associated maxillary and mandibular sets. These help reveal the earliest stages of human evolution. Ar. ramidus lacks the postcanine megadontia of Australopithecus . Its molars have thinner enamel and are functionally less durable than those of Australopithecus but lack the derived Pan pattern of thin occlusal enamel associated with ripe-fruit frugivory. The Ar. ramidus dental morphology and wear pattern are consistent with a partially terrestrial, omnivorous/frugivorous niche. Analyses show that the ARA-VP-6/500 skeleton is female and that Ar. ramidus was nearly monomorphic in canine size and shape. The canine/lower third premolar complex indicates a reduction of canine size and honing capacity early in hominid evolution, possibly driven by selection targeted on the male upper canine.

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“…The reproduction-related characters mentioned above, comparable to the secondary sexual characters of humans, develop rapidly with the onset of puberty at about 3.5 years in females and 4.5 years in males (Hamada et al 1999). In humans, facial, axillary, and pubic hair, breast development, testicular development, and voice changes (Tanner 1962) first occur in the adolescent period and rapidly develop.…”

Section: Introductionmentioning

confidence: 96%

Changes in testicular and nipple volume related to age and seasonality in Japanese macaques (Macaca fuscata), especially in the pre- and post-pubertal periods

et al. 2004

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We investigated, longitudinally and cross-sectionally, age and seasonal change in both the testis and nipple volume of Japanese macaques (Macaca fuscata) in relation to concentration profiles of gonadal steroids: testosterone (T) in males and progesterone (P) in females. Testicular volume (TV) and nipple volume (NV) showed rapid growth at puberty, 4.5 and 3.5 years of age in males and females, respectively, but in both sexes there were precocious individuals. The testis as a whole matures at about 10 years of age. TV change is closely related to T concentration profile. The pattern of TV change is composed of maturation and seasonal effects, with individual variation evident mainly in the latter. Some individuals show a simple pattern consisting of one peak in the breeding season (from summer to winter) and one trough in the non-breeding season. Other individuals exhibit a more complicated pattern composed of two or more peaks and troughs before and during the breeding season. The nipple matures at about 7 years but it is difficult to determine the exact maturational age as there are many confounding factors relating to NV. NV shows seasonal fluctuations similar to that of TV. Many animals have periods of substantial growth whereas others do not. The NV in adults from 10 to 25 years does not appear to change much with age, but animals older than 25 years of age have significantly smaller nipples. Seasonal fluctuation in NV mirrors that of the P level. Considered to be controlled by estrogen and P, the NV is a good indicator of the physiological status of reproduction, with its peak about 2 weeks earlier than that of P, that is, at the mid-follicular phase. NV and P level show a similar pattern in pregnancy; from conception, indicated by a P peak, NV and P concentration first decrease, then they increase until peri-parturition and slowly decrease again until the next breeding season.

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Adolescent growth and development in Japanese macaques (Macaca fuscata): Punctuated adolescent growth spurt by season

Cited by 27 publications

References 16 publications

Time Series Analysis of Plasma Insulin-like Growth Factor-I and Gonadal Steroids in Adolescent lapanese Macaques (Macaca fuscata).

Time Series Analysis of Plasma Insulin-like Growth Factor-I and Gonadal Steroids in Adolescent lapanese Macaques (Macaca fuscata).

Paleobiological Implications of the Ardipithecus ramidus Dentition

Changes in testicular and nipple volume related to age and seasonality in Japanese macaques (Macaca fuscata), especially in the pre- and post-pubertal periods

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