Kevin D Kohl, M Eugenia Ciminari, Juan G Chediack, James O Leafloor, William H Karasov, Scott R McWilliams, Enrique Caviedes-Vidal
{"title":"Modulation of digestive enzyme activities in the avian digestive tract in relation to diet composition and quality.","authors":"Kevin D Kohl, M Eugenia Ciminari, Juan G Chediack, James O Leafloor, William H Karasov, Scott R McWilliams, Enrique Caviedes-Vidal","doi":"10.1007/s00360-016-1037-6","DOIUrl":"10.1007/s00360-016-1037-6","url":null,"abstract":"<p><p>In nature, birds are faced with variable food sources that may differ in composition (protein vs. carbohydrates) and quality (highly digestible material vs. indigestible fiber). Studies in passerine birds and some commercial poultry demonstrate that the gastrointestinal tract can respond to varying diet composition and quality by changing morphology and/or activities of digestive enzymes. However, studies in additional avian species are warranted to understand generalities of these trends. We first fed juvenile mallards (Anas platyrhynchos), chickens (Gallus gallus), and quails (Coturnix coturnix) on either high-carbohydrate or high-protein diets. For the most part, birds fed the high-carbohydrate diet had higher small intestinal and cecal disaccharidase activities (maltase and sucrase). However, only mallards exhibited higher small intestinal aminopeptidase-N (APN) activities when fed the high-protein diet. These results differ from passerine birds, which largely modulate small intestinal proteases, but not disaccharidases. In another trial, we fed Canada geese (Branta canadensis) diets that varied in both their protein and fiber concentrations for approximately 3.5 months. Birds fed the high-fiber diets had significantly longer small intestines and caeca compared to those fed low-fiber diets. Additionally, geese fed the high-fiber diets exhibited lower mass-specific activities of small intestinal sucrase, and higher activities of APN when summed across the small intestine and ceca. Similar to the avian species above, geese fed the high-protein diets did not exhibit flexibility in their small intestinal APN activities. Overall, these experiments demonstrate that responsiveness of the avian digestive tract to diet composition may have phylogenetic or ecological constraints. Studies on other avian taxa are needed to understand these patterns.</p>","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"18 1","pages":"339-351"},"PeriodicalIF":0.0,"publicationDate":"2017-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81598921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jessica P. Otis, Amanda C. Pike, J. Torrealba, H. Carey
{"title":"Hibernation reduces cellular damage caused by warm hepatic ischemia–reperfusion in ground squirrels","authors":"Jessica P. Otis, Amanda C. Pike, J. Torrealba, H. Carey","doi":"10.1007/s00360-017-1056-y","DOIUrl":"https://doi.org/10.1007/s00360-017-1056-y","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"18 1","pages":"639 - 648"},"PeriodicalIF":0.0,"publicationDate":"2017-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84435052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aleksandar Z Baburski, Srdjan J. Sokanovic, S. Andric, T. Kostic
{"title":"Aging has the opposite effect on cAMP and cGMP circadian variations in rat Leydig cells","authors":"Aleksandar Z Baburski, Srdjan J. Sokanovic, S. Andric, T. Kostic","doi":"10.1007/s00360-016-1052-7","DOIUrl":"https://doi.org/10.1007/s00360-016-1052-7","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"29 1","pages":"613 - 623"},"PeriodicalIF":0.0,"publicationDate":"2016-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78310742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Differential expression and emerging functions of non-coding RNAs in cold adaptation","authors":"Jacques J. Frigault, M. Morin, P. Morin","doi":"10.1007/s00360-016-1049-2","DOIUrl":"https://doi.org/10.1007/s00360-016-1049-2","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"33 1","pages":"19 - 28"},"PeriodicalIF":0.0,"publicationDate":"2016-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84105152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Comp, Physiol, Sheena L. Faherty, Ryan Campbell, S. Hilbig, A. Yoder
{"title":"The effect of body mass and diet composition on torpor patterns in a Malagasy primate (Microcebus murinus)","authors":"J. Comp, Physiol, Sheena L. Faherty, Ryan Campbell, S. Hilbig, A. Yoder","doi":"10.1007/s00360-016-1045-6","DOIUrl":"https://doi.org/10.1007/s00360-016-1045-6","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"77 1","pages":"677 - 688"},"PeriodicalIF":0.0,"publicationDate":"2016-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77374430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ryan S. O’Connor, B. Wolf, R. Brigham, A. McKechnie
{"title":"Avian thermoregulation in the heat: efficient evaporative cooling in two southern African nightjars","authors":"Ryan S. O’Connor, B. Wolf, R. Brigham, A. McKechnie","doi":"10.1007/s00360-016-1047-4","DOIUrl":"https://doi.org/10.1007/s00360-016-1047-4","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"2 1","pages":"477 - 491"},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83679888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Thermal implications of interactions between insulation, solar reflectance, and fur structure in the summer coats of diverse species of kangaroo","authors":"T. Dawson, S. Maloney","doi":"10.1007/s00360-016-1043-8","DOIUrl":"https://doi.org/10.1007/s00360-016-1043-8","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"281 1","pages":"517 - 528"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77837386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Healy, Dillon J. Chung, Kyle G. Crowther, P. Schulte
{"title":"Metabolic and regulatory responses involved in cold acclimation in Atlantic killifish, Fundulus heteroclitus","authors":"T. Healy, Dillon J. Chung, Kyle G. Crowther, P. Schulte","doi":"10.1007/s00360-016-1042-9","DOIUrl":"https://doi.org/10.1007/s00360-016-1042-9","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"73 1","pages":"463 - 475"},"PeriodicalIF":0.0,"publicationDate":"2016-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86349192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Establishing the thermal window for aerobic scope in New Zealand geoduck clams (Panopea zelandica)","authors":"D. Le, A. Alfaro, N. Ragg, Zoë Hilton, N. King","doi":"10.1007/s00360-016-1038-5","DOIUrl":"https://doi.org/10.1007/s00360-016-1038-5","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"98 1","pages":"265 - 276"},"PeriodicalIF":0.0,"publicationDate":"2016-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74253680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jaya K. Matthews, Clare Stawski, G. Körtner, Cassandra A. Parker, F. Geiser
{"title":"Torpor and basking after a severe wildfire: mammalian survival strategies in a scorched landscape","authors":"Jaya K. Matthews, Clare Stawski, G. Körtner, Cassandra A. Parker, F. Geiser","doi":"10.1007/s00360-016-1039-4","DOIUrl":"https://doi.org/10.1007/s00360-016-1039-4","url":null,"abstract":"","PeriodicalId":15377,"journal":{"name":"Journal of Comparative Physiology B","volume":"2 1","pages":"385 - 393"},"PeriodicalIF":0.0,"publicationDate":"2016-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77475695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}