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六月完成的研究沒看到能找到的中文報導，能在嗑藥狀態中渡過一生令人羨慕。

摘要：蜂鳥會偏好取食含有酒精的低度發酵蜜源。

https://royalsocietypublishing.org/doi/10.1098/rsos.230306



Both frugivores and nectarivores are potentially exposed to dietary ethanol
produced by fermentative yeasts which metabolize sugars. Some nectarivorous
mammals exhibit a preference for low-concentration ethanol solutions compared
to controls of comparable caloric content, but behavioural responses to
ethanol by nectar-feeding birds are unknown. We investigated dietary
preference by Anna's Hummingbirds (Calypte anna) for ethanol-enhanced sucrose
solutions. Via repeated binary-choice experiments, three adult male
hummingbirds were exposed to sucrose solutions containing 0%, 1% or 2%
ethanol; rates of volitional nectar consumption were measured over a 3 h
interval. Hummingbirds did not discriminate between 0% and 1% ethanol
solutions, but exhibited significantly reduced rates of consumption of a 2%
ethanol solution. Opportunistic measurements of ethanol concentrations within
hummingbird feeders registered values peaking at about 0.05%. Ethanol at low
concentrations (i.e. up to 1%) is not aversive to Anna's Hummingbirds and may
be characteristic of both natural and anthropogenic nectars upon which they
feed. Given high daily amounts of nectar consumption by hummingbirds, chronic
physiological exposure to ethanol can thus be substantial, although naturally
occurring concentrations within floral nectar are unknown.



Ethanol concentrations within feeders, although seemingly low, were however
non-trivial given high volumetric rates of nectar consumption by
hummingbirds. Anna's Hummingbirds must consume about 10 g of 20% sucrose
solution daily to meet energetic needs [21]. Even if typical ethanol
concentrations in feeders are only 0.02%, such a rate of consumption would
still correspond to a daily dosage of 2 mg of ethanol (or about 0.04% of body
mass). By contrast, human consumption of one standard drink daily (containing
12 g of ethanol) corresponds to a exposure of about 0.015% of body mass,
assuming the latter to be 80 kg.


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※ 作者: STAV72 2023-08-07 15:04:50
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