Comparative Biochemistry and Physiology. Part A, Molecular and integrative 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.

When digestive physiology doesn't match "diet": Lumpenus sagitta (Stichaeidae) is an "omnivore" with a carnivorous gut
Comp Biochem Physiol A Mol Integr Physiol. 2023 Aug 23:111508. doi: 10.1016/j.cbpa.2023.111508. Online ahead of print.ABSTRACTWhat an animal ingests and what it digests can be different. Thus, we examined the nutritional physiology of Lumpenus sagitta, a member of the family Stichaeidae, to better understand whether it could digest algal components like its better studied algivorous relatives. Although L. sagitta ingests considerable algal content, we found little evidence of algal digestion. This fish species has a short gut that doesn't show positive allometry with body size, low amylolytic activity that actually decreas...
Source: Comparative Biochemistry and Physiology. Part A, Molecular and integrative physiology. - August 25, 2023 Category: Physiology Authors: Daniel R Rankins Michelle J Herrera Michelle P Christensen Alisa Chen Newton Z Hood Joseph Heras Donovan P German Source Type: research

Temporal variation of thermal sensitivity to global warming: Acclimatization in the guitarist beetle, Megelenophorus americanus (Coleoptera: Tenebrionidae) from the Monte Desert
Comp Biochem Physiol A Mol Integr Physiol. 2023 Aug 22:111505. doi: 10.1016/j.cbpa.2023.111505. Online ahead of print.ABSTRACTGlobal warming is a major threat to biodiversity, the increase in mean temperature plus the higher rate and intensity of heat waves can severely affect organisms by exposing them to temperatures beyond their tolerance limits. Desert ectotherms are particularly vulnerable due to their dependence on environmental temperatures in an extreme habitat. Thermal tolerance changes depending on environmental conditions, studying these fluctuations provides a better understanding of species susceptibility to g...
Source: Comparative Biochemistry and Physiology. Part A, Molecular and integrative physiology. - August 24, 2023 Category: Physiology Authors: Juan Hector Aragon-Traverso Mauricio Pi ñeiro Juan Pablo Segundo Olivares Eduardo Alfredo Sanabria Source Type: research

Characterizing the SREB G protein-coupled receptor family in fish: Brain gene expression and genomic differences in upstream transcription factor binding sites
Comp Biochem Physiol A Mol Integr Physiol. 2023 Aug 21:111507. doi: 10.1016/j.cbpa.2023.111507. Online ahead of print.ABSTRACTThe SREB (Super-conserved Receptors Expressed in Brain) family of orphan G protein-coupled receptors is highly conserved in vertebrates and consists of three members: SREB1 (orphan designation GPR27), SREB2 (GPR85), and SREB3 (GPR173). SREBs are associated with processes ranging from neuronal plasticity to reproductive control. Relatively little is known about similarities across the entire family, or how mammalian gene expression patterns compare to non-mammalian vertebrates. In fish, this system m...
Source: Comparative Biochemistry and Physiology. Part A, Molecular and integrative physiology. - August 23, 2023 Category: Physiology Authors: Timothy S Breton Samantha Fike Mullein Francis Michael Patnaude Casey A Murray Matthew A DiMaggio Source Type: research

Fluid and particle retention in a small New World and a small Old World cervid, the southern pudu (Pudu puda) and Reeves's muntjac (Muntiacus reevesi)
In this study, we measured SF and passage kinetics (using a liquid marker and markers of different particle size, fed with the diet) in a capreoline deer, the southern pudu (Pudu puda, n = 5, 10.3 ± 2.9 kg, kept at two zoos) and a cervine deer, the Reeves's muntjac (Muntiacus reevesi, n = 6, 11.0 ± 1.7 kg, kept at a research facility). The relative daily dry matter intake (38 ± 3 g/kg0.75 for pudu and 76 ± 5 g/kg0.75 for muntjac) was higher, and the mean retention times (MRT) correspondingly shorter (e.g., MRT small particles in the total digestive tract 39 ± 8 h for pudu and 15 ± 2 h for muntjac), in the muntjac. Th...
Source: Comparative Biochemistry and Physiology. Part A, Molecular and integrative physiology. - August 18, 2023 Category: Physiology Authors: Marcin Przyby ło Gracja Krajda Łukasz Różański Grzegorz Rolik Sylvia Ortmann Pawe ł Górka Marcus Clauss Source Type: research

Upstream migrant sea lamprey (Petromyzon marinus) show signs of increasing oxidative stress but maintain aerobic capacity with age
Comp Biochem Physiol A Mol Integr Physiol. 2023 Aug 14:111503. doi: 10.1016/j.cbpa.2023.111503. Online ahead of print.ABSTRACTFollowing the parasitic juvenile phase of their life cycle, sea lamprey (Petromyzon marinus) mature into a reproductive but rapidly aging and deteriorating adult, and typically die shortly after spawning from May to June. However, pre-spawning upstream migrant sea lamprey can be maintained for several months beyond their natural lifespan when held in cold water (~4-8 °C) under laboratory conditions. We exploited this feature to investigate the interactions between senescence, oxidative stress, and ...
Source: Comparative Biochemistry and Physiology. Part A, Molecular and integrative physiology. - August 16, 2023 Category: Physiology Authors: Brittney G Borowiec Allison E McDonald Michael P Wilkie Source Type: research

Beyond body condition: Experimental evidence that plasma metabolites improve nutritional state measurements in a free-living seabird
This study investigates the use of blood plasma metabolite concentrations, measured via point-of-care devices or a simple plate reader assay, as indicators of nutritional state in free-living seabirds. We experimentally manipulated the energy expenditure of wild black-legged kittiwakes (Gill & Hatch) on Middleton Island, Alaska, and measured the plasma concentrations of glucose, cholesterol, B-hydroxybutyrate, and triglycerides throughout the breeding season, along with measures of body condition (size-corrected mass [SCM] and muscle depth). Supplemental feeding improved the nutritional state of kittiwakes by increasin...
Source: Comparative Biochemistry and Physiology. Part A, Molecular and integrative physiology. - August 13, 2023 Category: Physiology Authors: Lauren Jackson Don-Jean L éandri-Breton Shannon Whelan Alexandre Turmaine Scott A Hatch David Gr émillet Kyle H Elliott Source Type: research