Diurnal and seasonal changes in blood composition of the free-living Egyptian fruit bat ( Rousettus aegyptiacus )

Korine, Carmi; Zinder, Oren; Arad, Zeev

doi:10.1007/s003600050222

Cited by 30 publications

(29 citation statements)

References 25 publications

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“…Indeed, some individuals exhibited intermediate values during the plateau phase, but we attribute these to instability in the measurements given that overestimation and underestimation of the expected plateau value occur to the same extent. In general, our results are in accord with those of Korine and colleagues (Korine et al, 1999b) who found that blood glucose and triglyceride levels are negatively correlated in postprandial Egyptian fruit bats indicating that exogenous glucose is the prime energy source during their active phase at night, and endogenous lipids are the prime energy source during their daytime rest phase.…”

supporting

confidence: 93%

Fruit bats (Pteropodidae) fuel their metabolism rapidly and directly with exogenous sugars

Amitai

Holtze

Barkan

et al. 2010

Journal of Experimental Biology

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SUMMARYPrevious studies reported that fed bats and birds mostly use recently acquired exogenous nutrients as fuel for flight, rather than endogenous fuels, such as lipids or glycogen. However, this pattern of fuel use may be a simple size-related phenomenon because, to date, only small birds and bats have been studied with respect to the origin of metabolized fuel, and because small animals carry relatively small energy reserves, considering their high mass-specific metabolic rate. We hypothesized that ~150g Egyptian fruit bats (Rousettus aegyptiacus Pteropodidae), which are more than an order of magnitude heavier than previously studied bats, also catabolize dietary sugars directly and exclusively to fuel both rest and flight metabolism. We based our expectation on the observation that these animals rapidly transport ingested dietary sugars, which are absorbed via passive paracellular pathways in the intestine, to organs of high energy demand. We used the stable carbon isotope ratio in exhaled CO 2 ( 13 C breath ) to assess the origin of metabolized substrates in 16 Egyptian fruit bats that were maintained on a diet of C3 plants before experiments. First, we predicted that in resting bats 

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supporting

confidence: 93%

Fruit bats (Pteropodidae) fuel their metabolism rapidly and directly with exogenous sugars

Amitai

Holtze

Barkan

et al. 2010

Journal of Experimental Biology

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“…The lack of fluctuations in blood glucose levels throughout the year is a good indicator of the animals' physiological state (Korine et al 1999), and corroborates the pattern found in other species of fruit bats ), blood-eating bats (Freitas et al 2006;Gomes 2008), and insect-eating bats (Srivastava and Krishna 2008;Freitas et al 2010).…”

Section: Discussionsupporting

confidence: 57%

Seasonal assessment of the reproductive cycle and energy reserves of male batsSturnira lilium(Chiroptera: Phyllostomidae)

Morais

Barros²,

Ariella³

et al. 2014

J Mammal

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Bats play an important role in regulating ecosystems, and seasonality has great influence on their reproductive cycle and storage status of bodily energy reserves. Aiming at a better understanding of the dynamics of these processes, male little yellow-shouldered bats (Sturnira lilium) were captured during both the dry and rainy seasons and their reproductive and metabolic patterns were established. Testes were processed histologically for morphometric analysis by light microscopy. Plasma glucose and testosterone concentrations were determined, as well as liver and muscle glycogen, lipids, and protein. Data showed little variation in testicular morphometrical parameters and also in body energy reserves between the seasons evaluated. We conclude that occasional season variations in bodily energy reserves in S. lilium do not seem to present a major influence on testicular morphometry in this species, which may reflect a successful adaptation of S. lilium to its habitats.

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“…Seasonal changes in hematology have been recorded in birds [1,5,9,17,20,27], bears [8], deer [14], bats [12] and fish [4]. However, there have been few reports of seasonal changes of hematological values for marine mammals [26].…”

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confidence: 99%

Seasonal Changes of Blood Composition in Captive Bottlenose Dolphins.

Terasawa

Kitamura

Fujimoto

et al. 2002

The Journal of Veterinary Medical Science

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ABSTRACT. To determine how blood values in bottlenose dolphins changed during the year, 504 blood samples were taken from 9 dolphins from 1991 to 1999 and clinical blood examinations were undertaken monthly including 3 hematological and 19 serum chemistry tests. In creatinine, significant seasonal changes were found among three groups of adult males, adult females and juveniles, and the average values in summer were 15-38% higher than those in winter. In two out of three groups the average total cholesterol value were h ighest in winter, and the lowest of all groups were in summer. In two other groups the peaks of average FFA value were recorded in sum mer, and the lows were in winter. KEY WORDS: bottlenose dolphin, seasonal change, serum chemistry.J. Vet. Med. Sci. 64(11): 1075-1078, 2002 The physiology of free-living marine mammals adapts to seasonal environmental changes. It is known that bottlenose dolphins migrate seasonally, and the migration is probably a response to temperature changes [16,21]. Several physiological parameters, for example, the thickness of blubber [25], the body mass [21] and the rectal body temperature [23], are known to have seasonality even in captive dolphins.Seasonal changes in hematology have been recorded in birds [1,5,9,17,20,27] The blood samples taken from wild dolphins may be affected by several factors, including their handling stress and their diet. We previously reported how diet affected the blood composition of this species [24]. Therefore, it is necessary to examine the case of bottlenose dolphins in captivity. The information presented should help to establish a hematological base line of seasonal changes for bottlenose dolphins. It is important to be aware of seasonal changes for evaluating long-term physiological variations, for example, during pregnancy. Therefore, this report examines how blood values change seasonally in captive bottlenose dolphins, Tursiops truncatus, from the results of clinical blood examinations at Enoshima Aquarium from 1991 to 1999.Hematological data were compiled from the routine health records of 9 bottlenose dolphins (Table 1) which were divided into three groups: adult males (two dolphins, aged over 12 years), adult females (two dolphins, aged over 12 years), and juveniles (one male and four females, aged under 6 years) at Enoshima Aquarium, Kanagawa, Japan. This age classification was not changed throughout the study period. Three of these dolphins were born at this facility. The other six dolphins originated in waters around Japan. When they were brought into captivity, we estimated their ages from body length and body mass [22]. Clinical data over a 9-year period (1991 to 1999) for adult males and females, and a 5-year period (1995 to 1999) for juveniles were used, and a total of 504 blood samples were taken. Only blood samples from dolphins judged to be normal by behavior, appearance, or food consumption were used.The tank is outdoors with a total seawater volume of 5000 m 3 (45 m × 25 m, oval-shaped, with a depth of 3.5 to 5.5 m).

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Diurnal and seasonal changes in blood composition of the free-living Egyptian fruit bat ( Rousettus aegyptiacus )

Cited by 30 publications

References 25 publications

Fruit bats (Pteropodidae) fuel their metabolism rapidly and directly with exogenous sugars

Fruit bats (Pteropodidae) fuel their metabolism rapidly and directly with exogenous sugars

Seasonal assessment of the reproductive cycle and energy reserves of male batsSturnira lilium(Chiroptera: Phyllostomidae)

Seasonal Changes of Blood Composition in Captive Bottlenose Dolphins.

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