Seasonal effects of temperature on the respiratory metabolism of the collared peccary (Tayassu tajacu)

Zervanos, Stam M.

doi:10.1016/0300-9629(75)90027-4

Cited by 33 publications

(19 citation statements)

References 16 publications

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“…The collared peccary originated in the tropics (Woodburne, 1968), where photoperiod is a less important cue. However, by extending its range into warm, semiarid regions of the American southwest, the peccary may have adjusted to seasonal environmental changes through physiological flexibility (Zervanos, 1975). Photoperiod changes thus may alter endogenous peccary neuroendocrine function.…”

Section: Discussionmentioning

confidence: 99%

Seasonal variation in serum testosterone, testicular measurements and semen characteristics in the collared peccary (Tayassu tajacu)

Hellgren

Lochmiller²,

Amoss³

et al. 1989

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Blood samples and testicular measurements were obtained from 4-8 captive adult collared peccaries monthly for 18 months and from wild adult males during summer (N = 16) and winter (N = 22) seasons. Serum concentrations of testosterone were determined by radioimmunoassay. Semen samples were collected monthly by electroejaculation from captive males for 1 year. Serum testosterone concentrations and testicular measurements varied in a low-amplitude circannual pattern, with maximum mean testosterone concentrations in fall and winter (1150-1400 pg/ml) and minimum values in summer (500-700 pg/ml). Circannual rhythms appeared to be related to dominance. Serum testosterone levels in wild males generally were lower than in captive males, although this difference was not significant (P greater than 0.05). Semen characteristics did not exhibit a circannual rhythm. These results suggest that the male peccary remains reproductively fertile throughout the year, yet may undergo a facultative summer quiescence influenced by ambient temperature and social factors.

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Section: Discussionmentioning

confidence: 99%

Seasonal variation in serum testosterone, testicular measurements and semen characteristics in the collared peccary (Tayassu tajacu)

Hellgren

Lochmiller²,

Amoss³

et al. 1989

Reproduction

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“…Peccaries do not possess a thick insulating subcutaneous fat layer nor a wooly undercoat (Knipe, 1956 ;Zervanos, and Hadley, 1973), i.e. they are poorly insulated against ambient temperatures (Zervanos, 1975). Of the three investigated animals only one possessed a layer of subcutaneous fat on its flanks with a thickness of approximately 1 cm.…”

Section: Discussionmentioning

confidence: 99%

Adaptational significance of the forestomach of the collared peccary, Dicotyles tajacu (L. 1758) (Mammalia : Artiodactyla)

Langer¹

1979

Mammalia

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Dicotyles iajacu a un estomac complique, forme d'une poche volumineuse avec deux grosses expansions en cul-de-sac et d'une poche glandulaire. La plus grande partie de celleci est garnie de glandes pyloriques et fundiques. Dans la partie ventrale de la poche gastrique et dans ses deux expansions 1*epithelium glandulaire est de m&me type que celui des glandes cardiales. Le reste de la poche et de ses expansions, ainsi qu'une petite partie orale de Pestomac glandulaire, sont converts d'un epithelium avec une couche cornee. Des plis importants separent incompletement les diilerents compartiments gastriques.Les donne*es de la litterature indiquent que Testomac anterieur (poche gastrique avec ses deux expansions) pourrait servir de reservoir de fermentation.Dans le sud-ouest de l'Amarique du N T ord Opuntia eugelmanmi, cactus figues couvertes de piquants, est la nourriture principale du p£cari a collier. II procure Fanimal une grande quantite d'eau. Cette nourriture est d'ailleurs succulente et abondante.Pendant les periodes de grande chaleur les pe"caris a collier se reposent l'ombre de grottes ou de buissons. Us ne prennent pas de nourriture pendant qu'ils se reposent mais ils ont largement le temps de digerer. II est avantageux pour le pecari de disposer d'un tres grand volume gastrique pour mettre en reserve sa nourriture du fait de la succulence et de l'abondance de celle-ci, et aussi de ses caracteristiques anatomiques ainsi que du peu de temps dont il dispose pour manger. Bien qu'on n'ait aucun detail sur la physiologic de la digestion chez le ρέΰαπ, son estomac peut dej e^tre considero comme un organe hautement adaptatif.

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“…Watson's U 2 test was used to compare the activity patterns between the species and among seasons (Zar 2010). We used the angular-linear correlation test to evaluate the relationship between the activity time of the white-lipped and collared peccaries and the temperature recorded by the camera trap at each time (Zar 2010). The data obtained at the artificial ponds were subjected to the same aforementioned tests to evaluate the possible differences in pond use between the species.…”

Section: Activity Pattern Analysismentioning

confidence: 99%

“…Rao's spacing test was used to evaluate the randomness of the distribution of the species activity schedules throughout the day during the wet and dry periods (Mardia and Jupp 2000). Watson's U 2 test was used to compare the activity patterns between the species and among seasons (Zar 2010). We used the angular-linear correlation test to evaluate the relationship between the activity time of the white-lipped and collared peccaries and the temperature recorded by the camera trap at each time (Zar 2010).…”

Section: Activity Pattern Analysismentioning

confidence: 99%

Implications of climatic seasonality on activity patterns and resource use by sympatric peccaries in northern Pantanal

et al. 2015

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We evaluated the effects of climate seasonality from a thermal and water availability perspective on the activity patterns and resource use of Pecari tajacu and Tayassu pecari during wet and dry seasons in the northeastern Brazilian Pantanal. We used camera traps and temperature sensors to record species activity patterns in relation to temperature, established five habitat categories based on flooding intensity and local vegetation characteristics, assessed the activity patterns of each species in dry and wet periods and in artificial water bodies using circular statistical metrics, and calculated niche amplitude and overlap on three axes (temperature, time, and habitat) in both periods. Peccaries shared a strong resemblance in resource use and in their responses to seasonal variations in the tested gradients. The activity patterns of both species exhibited a significant correlation with air temperature on all the evaluated measures, and both species strongly reduced their activity when the air temperature exceeded 35 °C. High temperatures associated with low water availability were most likely responsible for the changes in species activity patterns, which resulted in an increased temporal overlap in habitat use throughout the dry season. However, the peccaries avoided intensively flooded habitats; therefore, the habitat gradient overlap was greater during the wet period. Our results show that an increase in niche overlap on the environmental gradient as a result of climatic seasonality may be partially compensated by a reduction in other niche dimensions. In this case, temporal partitioning appears to be an important, viable mechanism to reduce competition by potentially competing species.

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Seasonal effects of temperature on the respiratory metabolism of the collared peccary (Tayassu tajacu)

Cited by 33 publications

References 16 publications

Seasonal variation in serum testosterone, testicular measurements and semen characteristics in the collared peccary (Tayassu tajacu)

Seasonal variation in serum testosterone, testicular measurements and semen characteristics in the collared peccary (Tayassu tajacu)

Adaptational significance of the forestomach of the collared peccary, Dicotyles tajacu (L. 1758) (Mammalia : Artiodactyla)

Implications of climatic seasonality on activity patterns and resource use by sympatric peccaries in northern Pantanal

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