Abstract：
:Darwinian fitness reflects trade-offs between reproduction and survival. Mechanisms have evolved in small nontropical mammals and birds to maximize reproductive output during the summer when thermoregulatory demands are relatively low and food is abundant and to shunt energy to processes that presumably increase the odds of survival during the winter when thermoregulatory demands are high and food is scarce. In order to predict the onset of winter, many seasonally-breeding mammals use day length (photoperiod) information. Seasonal adjustments of immune responses may be one mechanism to enhance survival; short days enhance cell-mediated immune function in seasonally-breeding rodents. The goal of the present study was to determine whether delayed-type hypersensitivity in hamsters is constrained or if photoperiod merely establishes a baseline level of immune response that can then be fined tuned by other environmental conditions. To test this, we used environmental enrichment, a manipulation that enhances many aspects of immune function. Hamsters were assigned to either long or short photoperiods and further assigned into either singly-housed or environmentally-enriched cages. After 10 weeks of concurrent photoperiod and housing treatment, delayed-type hypersensitivity (DTH) was induced. Although short days enhanced DTH responses compared with long days, environmental enrichment enhanced swelling responses in both short days and long days, suggesting that even during potential energetic bottlenecks or during maximal reproductive investment, hamsters can modulate their investment in immune function.
journal_name
Physiol Behavjournal_title
Physiology & behaviorauthors
Workman JL,DeWitt SJ,Fonken LK,Nelson RJdoi
10.1016/j.physbeh.2010.01.029subject
Has Abstractpub_date
2010-04-19 00:00:00pages
638-43issue
5eissn
0031-9384issn
1873-507Xpii
S0031-9384(10)00042-9journal_volume
99pub_type
杂志文章abstract：:We investigated whether juveniles of the nocturnal fish jundiá (Rhamdia quelen) and the diurnal fish Nile tilapia (Oreochromis niloticus) are able to chemically communicate stress to conspecifics. Groups of 8 fish were reared in tanks under recirculated water (water exchanged among all the tanks) for each species. Fis...
journal_title：Physiology & behavior
pub_type： 杂志文章
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更新日期：2011-06-01 00:00:00
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更新日期：2012-07-16 00:00:00
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journal_title：Physiology & behavior
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更新日期：1985-03-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/j.physbeh.2004.05.006
更新日期：2004-09-15 00:00:00
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journal_title：Physiology & behavior
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doi：10.1016/0031-9384(83)90148-8
更新日期：1983-03-01 00:00:00
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doi：10.1016/j.physbeh.2007.05.063
更新日期：2007-11-23 00:00:00
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pub_type： 杂志文章,评审
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更新日期：2004-08-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/0031-9384(85)90193-3
更新日期：1985-03-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
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更新日期：1999-01-01 00:00:00
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pub_type： 杂志文章
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更新日期：2010-05-11 00:00:00
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pub_type： 杂志文章
doi：10.1016/0031-9384(92)90429-6
更新日期：1992-07-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章,评审
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更新日期：2018-08-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
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更新日期：1992-02-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/j.physbeh.2014.04.007
更新日期：2014-06-22 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
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更新日期：1975-06-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/0031-9384(96)00131-x
更新日期：1996-09-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 临床试验,杂志文章
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更新日期：1999-07-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/0031-9384(94)90076-0
更新日期：1994-05-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/j.physbeh.2005.04.023
更新日期：2005-07-21 00:00:00
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pub_type： 杂志文章,评审
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更新日期：2004-11-15 00:00:00
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更新日期：2009-01-08 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/0031-9384(84)90380-9
更新日期：1984-10-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
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更新日期：1997-06-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
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更新日期：2017-02-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
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更新日期：1993-11-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/0031-9384(94)00370-k
更新日期：1995-05-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/s0031-9384(00)00395-4
更新日期：2001-01-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
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更新日期：2015-03-01 00:00:00
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journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/j.physbeh.2016.10.005
更新日期：2016-12-01 00:00:00
abstract：:Fed rats were exercised until exhaustion by almost 65% VO2max on a treadmill. In 2.5 min after the exercise, blood was collected from various vessels of the splanchnic bed. Metabolites, glucose, lactate, ketone body, and nitrogencompounds in the plasma, were measured. Glucose excretion from the liver was increased by ...
journal_title：Physiology & behavior
pub_type： 杂志文章
doi：10.1016/0031-9384(94)00293-e
更新日期：1995-03-01 00:00:00
