Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Particle size reduction along the digestive tract of fat sand rats (Psammomys obesus) fed four chenopods
AbstractIt is generally accepted that microbial digestion contributes little to digesta particle size reduction in herbivores, and that faecal particle size reflects mainly chewing efficiency, and may vary with diet. Nevertheless, a decrease in mean particle size (MPS) along the gastrointestinal tract (GIT) has been reported, especially in hindgut fermenters. However, to what degree the very fine particle fraction (non-food origin, especially microbes) affects MPS is unclear. Fat sand rats (Psammomys obesus, diurnal herbivores,n = 23, 175 ± sd 24 g) consumed one of four chenopods (natural dietary items in the wil...
Source: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology - June 30, 2021 Category: Physiology Source Type: research

Effects of different temperatures on seawater acclimation in rainbow trout Oncorhynchus mykiss: osmoregulation and branchial phospholipid fatty acid composition
This study aimed to investigate the effects of different temperatures on seawater acclimation in rainbow trout (Oncorhynchus mykiss), in terms of growth performance, osmoregulatory capacity, and branchial phospholipid fatty acid  (PLFA) composition. The fish (initial weight, 94.73 g) were reared at 9, 12.5, and 16 °C for 28 days, then acclimated to seawater, and subsequently reared for 14 days. Sampling points were on the last day in freshwater, and the 1st, 4th, 7th, and 14th days after the salinity reached 30. The r esults showed the final weight, percent weight gain, and specific growth rate of rainbow trout at 12...
Source: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology - June 30, 2021 Category: Physiology Source Type: research

The development of the O2-sensing system in an amphibious fish: consequences of variation in environmental O2 levels
AbstractProper development of the O2-sensing system is essential for survival. Here, we characterized the development of the O2-sensing system in the mangrove rivulus (Kryptolebias marmoratus), an amphibious fish that transitions between hypoxic aquatic environments and O2-rich terrestrial environments. We found that NECs formed in the gills and skin ofK. marmoratus during embryonic development and that both NEC populations are retained from the embryonic stage to adulthood. We also found that the hyperventilatory response to acute hypoxia was present in embryonicK. marmoratus, indicating that functional O2-sensing pathway...
Source: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology - June 30, 2021 Category: Physiology Source Type: research

Body mass and sex, not local climate, drive differences in chill coma recovery times in common garden reared bumble  bees
AbstractThe time required to recover from cold exposure (chill coma recovery time) may represent an important metric of performance and has been linked to geographic distributions of diverse species. Chill coma recovery time (CCRT) has rarely been measured in bumble  bees (genusBombus) but may provide insights regarding recent changes in their distributions. We measured CCRT ofBombus vosnesenskii workers reared in common garden laboratory conditions from queens collected across altitude and latitude in the Western United States. We also compared CCRTs of male and female bumble  bees because males are often overlooked in ...
Source: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology - June 25, 2021 Category: Physiology Source Type: research

Development of metabolic inflammation during pre-hibernation fattening in 13-lined ground squirrels (Ictidomys tridecemlineatus)
AbstractObesity is a worldwide pandemic with significant comorbidities. It is often accompanied by mild inflammation of the intestine followed by inflammation of metabolic tissues such as liver, adipose tissue, and skeletal muscle. Several laboratory models of obesity exist, but seasonal models like hibernators may be valuable for understanding the pathogenesis of obesity independent of genetic or high-fat diet-induced changes. As part of their annual cycle, obligate hibernators, like the 13-lined ground squirrel (Ictidomys tridecemlineatus), undergo a rapid shift from a lean to an obese state to store energy in the form o...
Source: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology - June 24, 2021 Category: Physiology Source Type: research