L Michael Romero

Summary

Affiliation: Tufts University
Country: USA

Publications

  1. ncbi request reprint Increased energy expenditure but decreased stress responsiveness during molt
    Nicole E Cyr
    Department of Biology, Tufts University, Medford, Massachusetts 02155, USA
    Physiol Biochem Zool 81:452-62. 2008
  2. ncbi request reprint Using the reactive scope model to understand why stress physiology predicts survival during starvation in Galápagos marine iguanas
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, United States
    Gen Comp Endocrinol 176:296-9. 2012
  3. ncbi request reprint Collecting baseline corticosterone samples in the field: is under 3 min good enough?
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 140:73-9. 2005
  4. ncbi request reprint Seasonal glucocorticoid responses to capture in wild free-living mammals
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Am J Physiol Regul Integr Comp Physiol 294:R614-22. 2008
  5. pmc Stress physiology as a predictor of survival in Galapagos marine iguanas
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Proc Biol Sci 277:3157-62. 2010
  6. ncbi request reprint Corticosterone responses change seasonally in free-living house sparrows (Passer domesticus)
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 149:58-65. 2006
  7. ncbi request reprint Corticosterone inhibits feather growth: potential mechanism explaining seasonal down regulation of corticosterone during molt
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 142:65-73. 2005
  8. ncbi request reprint Diurnal and nocturnal differences in hypothalamic-pituitary-adrenal axis function in Galápagos marine iguanas
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 145:177-81. 2006
  9. ncbi request reprint Seasonal changes in hypothalamic-pituitary-adrenal axis sensitivity in free-living house sparrows (Passer domesticus)
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 149:66-71. 2006
  10. ncbi request reprint The Reactive Scope Model - a new model integrating homeostasis, allostasis, and stress
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Horm Behav 55:375-89. 2009

Detail Information

Publications54

  1. ncbi request reprint Increased energy expenditure but decreased stress responsiveness during molt
    Nicole E Cyr
    Department of Biology, Tufts University, Medford, Massachusetts 02155, USA
    Physiol Biochem Zool 81:452-62. 2008
    ..Overall, our data suggest that molt is not only energetically expensive but that it also alters multiple stress response pathways. Furthermore, most acute stressors do not appear to require a significant increase in energy expenditure...
  2. ncbi request reprint Using the reactive scope model to understand why stress physiology predicts survival during starvation in Galápagos marine iguanas
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, United States
    Gen Comp Endocrinol 176:296-9. 2012
    ..Reactive scope thus provides a foundation for interpreting and predicting physiological stress responses...
  3. ncbi request reprint Collecting baseline corticosterone samples in the field: is under 3 min good enough?
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 140:73-9. 2005
    ....
  4. ncbi request reprint Seasonal glucocorticoid responses to capture in wild free-living mammals
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Am J Physiol Regul Integr Comp Physiol 294:R614-22. 2008
    ....
  5. pmc Stress physiology as a predictor of survival in Galapagos marine iguanas
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Proc Biol Sci 277:3157-62. 2010
    ..These data suggest that a greater ability to terminate a stress response conferred a survival advantage during starvation...
  6. ncbi request reprint Corticosterone responses change seasonally in free-living house sparrows (Passer domesticus)
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 149:58-65. 2006
    ..Stress-induced free CORT, however, was higher in Massachusetts males and females during the Fall and Winter, suggesting a potential differential response to stress associated with commensalism...
  7. ncbi request reprint Corticosterone inhibits feather growth: potential mechanism explaining seasonal down regulation of corticosterone during molt
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 142:65-73. 2005
    ..The results suggest a tradeoff; a complete set of new feathers may be more important to the survival of a bird than the ability of CORT to respond maximally to a stressor...
  8. ncbi request reprint Diurnal and nocturnal differences in hypothalamic-pituitary-adrenal axis function in Galápagos marine iguanas
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 145:177-81. 2006
    ..However, the failure of negative feedback at night suggests that the response is not equivalent to the controlled downregulation seen in mammals...
  9. ncbi request reprint Seasonal changes in hypothalamic-pituitary-adrenal axis sensitivity in free-living house sparrows (Passer domesticus)
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 149:66-71. 2006
    ..Consequently, seasonal modulation of corticosterone release in house sparrows appear to result from a complicated mix of adrenal, pituitary, and hypothalamic changes that also vary seasonally...
  10. ncbi request reprint The Reactive Scope Model - a new model integrating homeostasis, allostasis, and stress
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Horm Behav 55:375-89. 2009
    ..The Reactive Scope Model, as an extension of allostasis, should be useful to both biomedical researchers studying laboratory animals and humans, as well as ecologists studying stress in free-living animals...
  11. ncbi request reprint Photoperiodically-induced changes in hypothalamic-pituitary-adrenal axis sensitivity in captive house sparrows (Passer domesticus)
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 147:562-8. 2007
    ..Taken together, these data provide further evidence that there are complex regulatory mechanisms controlling diel and seasonal changes in corticosterone titers in birds...
  12. ncbi request reprint Exposure to chronic stress downregulates corticosterone responses to acute stressors
    Erin L Rich
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Am J Physiol Regul Integr Comp Physiol 288:R1628-36. 2005
    ....
  13. ncbi request reprint Fecal glucocorticoid metabolites of experimentally stressed captive and free-living starlings: implications for conservation research
    Nicole E Cyr
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 158:20-8. 2008
    ..Overall, our results suggest that more research is need before FGM analysis can be used as a reliable measure of stress in animals, especially those kept in captivity...
  14. doi request reprint Initial transference of wild birds to captivity alters stress physiology
    Molly J Dickens
    Department of Biology, Tufts University, Dana Hall, Medford, MA 02155, USA
    Gen Comp Endocrinol 160:76-83. 2009
    ..The duration of these alterations likely varies due to differences in capture techniques, transport distance, and species studied...
  15. doi request reprint Wild European starlings (Sturnus vulgaris) adjust to captivity with sustained sympathetic nervous system drive and a reduced fight-or-flight response
    Molly J Dickens
    Department of Biology, Tufts University, Medford, Massachusetts 02155, USA
    Physiol Biochem Zool 82:603-10. 2009
    ..These data are the first to show that successive acute stressors and introduction to a captive setting significantly alter the physiology and responsiveness of the cardiovascular stress response system...
  16. ncbi request reprint Effects of arginine vasotocin (AVT) on the behavioral, cardiovascular, and corticosterone responses of starlings (Sturnus vulgaris) to crowding
    Benjamin C Nephew
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Horm Behav 47:280-9. 2005
    ..These data support the hypothesis that AVT's attenuation of general behavior and crowding induced aggression are modulated by a cardiovascular mechanism...
  17. doi request reprint Testing the role of patch openness as a causal mechanism for apparent area sensitivity in a grassland specialist
    Alexander C Keyel
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Oecologia 169:407-18. 2012
    ..Finally, openness measures may have applications for predicting effects of habitat management or development, such as adding wind turbines, in open habitat...
  18. ncbi request reprint Captive European starlings (Sturnus vulgaris) in breeding condition show an increased cardiovascular stress response to intruders
    Molly J Dickens
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Physiol Biochem Zool 79:937-43. 2006
    ..This seasonal shift in response suggests that a higher tolerance for intrusion (i.e., considering a nearby starling as less stressful) may facilitate flocking behavior, while a lower tolerance may aid in territoriality...
  19. ncbi request reprint A potential cardiovascular mechanism for the behavioral effects of central and peripheral arginine vasotocin
    Benjamin C Nephew
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 144:156-66. 2005
    ..However, both central and peripheral AVT attenuated heart rate independent of increased plasma corticosterone. These data suggest that AVT's behavioral effects may be modulated by a corticosterone-independent cardiovascular mechanism...
  20. doi request reprint Effects of predictable and unpredictable food restriction on the stress response in molting and non-molting European starlings (Sturnus vulgaris)
    Carolyn M Bauer
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 160:390-9. 2011
    ..In conclusion, starlings appear resistant to developing symptoms of chronic stress from repeated food restriction...
  21. doi request reprint Heart rate and heart-rate variability responses to acute and chronic stress in a wild-caught passerine bird
    Nicole E Cyr
    Department of Biology, Tufts University, Medford, Massachusetts 02155, USA
    Physiol Biochem Zool 82:332-44. 2009
    ..Overall, chronic stress in wild-caught starlings elicited profound changes in cardiac function that were primarily regulated by changes in the PNS...
  22. doi request reprint Adrenocortical responses to offspring-directed threats in two open-nesting birds
    Luke K Butler
    Department of Biology, 163 Packard Avenue, Tufts University, Medford, MA 02155 5818, USA
    Gen Comp Endocrinol 162:313-8. 2009
    ..We extend that paradigm by demonstrating that nest style may influence how adults perceive the correlation between offspring-directed and self-directed threats...
  23. ncbi request reprint Effect of tidal cycle and food intake on the baseline plasma corticosterone rhythm in intertidally foraging marine iguanas
    Sarah K Woodley
    Department of Biology, Arizona State University, Tempe, AZ 85281, USA
    Gen Comp Endocrinol 132:216-22. 2003
    ..Together, these data suggest that the baseline B rhythm in marine iguanas is influenced by the tidal cycle/food intake as well as the light:dark cycle...
  24. doi request reprint Artificial rain and cold wind act as stressors to captive molting and non-molting European starlings (Sturnus vulgaris)
    Robert de Bruijn
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 164:512-9. 2013
    ..These data suggest these stimuli induce increased allostatic load in starlings, and that animals may adjust their response depending on the life-history stage...
  25. ncbi request reprint Combined effects of molt and chronic stress on heart rate, heart rate variability, and glucocorticoid physiology in European starlings
    Sophia Kostelanetz
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 154:493-501. 2009
    ..Overall, the data suggest that molt requires a degree of physiological stability that must be protected, so that if a bird is exposed to chronic stress during this life-history stage, molt takes priority...
  26. doi request reprint Corticosterone stress response in tree swallows nesting near polychlorinated biphenyl- and dioxin-contaminated rivers
    Melinda D Franceschini
    Department of Biology, 163 Packard Avenue, Tufts University, Medford, Massachusetts 02155, USA
    Environ Toxicol Chem 27:2326-31. 2008
    ..Altogether these findings suggest that tree swallows chronically exposed to high PCB and TCDD levels exhibit altered baseline and stress-induced corticosterone responses, but the patterns of alteration might not be predictable...
  27. ncbi request reprint Behavioral, physiological, and endocrine responses of starlings to acute increases in density
    Benjamin C Nephew
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Horm Behav 44:222-32. 2003
    ....
  28. ncbi request reprint Repeatability of baseline corticosterone concentrations
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 156:27-33. 2008
    ..These data indicate that it is not always a good assumption that birds can be categorized as individuals with higher and lower titers, which will complicate analyses of the causes of interindividual variation...
  29. ncbi request reprint The effects of chronic psychological and physical stress on feather replacement in European starlings (Sturnus vulgaris)
    David E Strochlic
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 149:68-79. 2008
    ..Additionally, the purpose for downregulating CORT concentrations during molt appears to be more complicated than simply protecting feather production from CORT's catabolic effects...
  30. ncbi request reprint The effect of chronic psychological stress on corticosterone, plasma metabolites, and immune responsiveness in European starlings
    Nicole E Cyr
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 154:59-66. 2007
    ....
  31. pmc Intracellular glucocorticoid receptors in spleen, but not skin, vary seasonally in wild house sparrows (Passer domesticus)
    Christine R Lattin
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Proc Biol Sci 280:20123033. 2013
    ..We saw no seasonal patterns in GR or MR in skin, suggesting skin's response to CORT is modulated primarily via changes in circulating CORT titres and/or via local production of CORT in response to wounding and other noxious stimuli...
  32. pmc The size of a melanin-based plumage ornament correlates with glucocorticoid receptor concentrations in the skin of that ornament
    Christine R Lattin
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Biol Lett 9:20130440. 2013
    ..These results suggest a connection between the size of a melanin-based ornament and the underlying tissue's responsiveness to CORT. ..
  33. pmc Stress and translocation: alterations in the stress physiology of translocated birds
    Molly J Dickens
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Proc Biol Sci 276:2051-6. 2009
    ..This conclusion emphasizes the need for understanding and alleviating translocation-induced chronic stress in order to use most effectively this important conservation tool...
  34. doi request reprint Identifying hormonal habituation in field studies of stress
    Nicole E Cyr
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 161:295-303. 2009
    ..These tests will help identify hormonal habituation in free-living animals and prevent potential problems of falsely describing an individual or population of individuals as habituated...
  35. ncbi request reprint Corticosterone concentrations in free-living spotted salamanders (Ambystoma maculatum)
    Rebecca Newcomb Homan
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 130:165-71. 2003
    ..The ability to sample blood from spotted salamanders using a non-lethal technique offers an opportunity to better understand both amphibian physiology and ecology...
  36. doi request reprint Exogenous and endogenous corticosterone alter feather quality
    David W DesRochers
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 152:46-52. 2009
    ....
  37. ncbi request reprint Seasonal variation in the degu (Octodon degus) endocrine stress response
    Carolyn M Bauer
    Department of Biology, Tufts University, Medford, MA, USA Electronic address
    Gen Comp Endocrinol 197:26-32. 2014
    ..Consequently, CORT responses to stress appear to be regulated according to different life history needs. ..
  38. doi request reprint Habitat type influences endocrine stress response in the degu (Octodon degus)
    Carolyn M Bauer
    Department of Biology, Tufts University, Medford, MA, USA
    Gen Comp Endocrinol 186:136-44. 2013
    ..Results suggest that degus in habitats with good cover quality, low ectoparasite loads, and increased food availability have decreased endocrine stress responses...
  39. doi request reprint Behavioral and physiological responses of wild-caught European starlings (Sturnus vulgaris) to a minor, rapid change in ambient temperature
    Robert de Bruijn
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 160:260-6. 2011
    ..We conclude that minor changes in temperature can elicit a stress response in European starlings, which suggests that this may be an important mechanism by which animals cope with minor rapid environmental changes...
  40. doi request reprint The corticosterone stress response and mercury contamination in free-living tree swallows, Tachycineta bicolor
    Melinda D Franceschini
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Ecotoxicology 18:514-21. 2009
    ..Further, mercury contamination may not alter stress-induced corticosterone concentrations in tree swallows but appears to have a significant impact on baseline circulating corticosterone...
  41. ncbi request reprint Heart rate and behavior are regulated independently of corticosterone following diverse acute stressors
    Benjamin C Nephew
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 133:173-80. 2003
    ..The data indicate that starlings modulate HR, CORT, and behavioral responses depending upon the stressor, but that these three pathways are regulated independently...
  42. ncbi request reprint Corticosterone is not correlated with nest departure in snowy owl chicks (Nyctea scandiaca)
    L Michael Romero
    Department of Biology, Tufts University of Medford, MA 02155, USA
    Gen Comp Endocrinol 149:119-23. 2006
    ..Brood size was not correlated with age of nest departure or individual corticosterone concentrations. These data indicate that it is unlikely that corticosterone plays a role in triggering nest departure in snowy owl chicks...
  43. ncbi request reprint There is no correlation between glucocorticoid receptor mRNA expression and protein binding in the brains of house sparrows (Passer domesticus)
    Carlos O Medina
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 193:27-36. 2013
    ..The overall conclusion is that mRNA expression cannot be used as a proxy for GR or MR binding in house sparrows. ..
  44. ncbi request reprint Seasonal changes in plasma glucocorticoid concentrations in free-living vertebrates
    L Michael Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Gen Comp Endocrinol 128:1-24. 2002
    ..Consequently, understanding seasonal modulation of GC release has far-reaching importance for both the physiology of the stress response and the short-term survival of individual animals...
  45. ncbi request reprint Chronic stress alters concentrations of corticosterone receptors in a tissue-specific manner in wild house sparrows (Passer domesticus)
    Christine R Lattin
    Department of Biology, Tufts University, Medford, MA 02155, USA
    J Exp Biol 217:2601-8. 2014
    ..This difference may help explain previous reports of a greater effect of CORT on pectoralis than on other muscle types, and indicate that birds use this muscle as a protein reserve. ..
  46. ncbi request reprint Evaluating the Stress Response as a Bioindicator of Sub-Lethal Effects of Crude Oil Exposure in Wild House Sparrows (Passer domesticus)
    Christine R Lattin
    Department of Biology, Tufts University, Medford, Massachusetts, United States of America
    PLoS ONE 9:e102106. 2014
    ..Overall, this study suggests that the response of CORT to stressors, but not baseline HPA function, may be a particularly sensitive bioindicator of sub-lethal chronic effects of crude oil exposure. ..
  47. ncbi request reprint Postnatal salivary cortisol and sense of coherence (SOC) in Eritrean mothers
    Astier M Almedom
    Tufts University, Biology Department, 165 Packard Avenue, Medford, Massachusetts 02155, USA
    Am J Hum Biol 17:376-9. 2005
    ..017). No associations were found between cortisol and age or parity. The implications of these findings for maternity health service policy and practice in Eritrea are considered...
  48. ncbi request reprint Effect of exogenous corticosterone on respiration in a reptile
    Sarah E DuRant
    Wildlife Ecotoxicology and Physiological Ecology Program, Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
    Gen Comp Endocrinol 156:126-33. 2008
    ..Our results suggest that GC-induced changes in respiration may be important for understanding the overall energetic implications of stress...
  49. ncbi request reprint Behavioral and adrenocortical responses to mate separation and reunion in the zebra finch
    Luke Remage-Healey
    Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA
    Horm Behav 43:108-14. 2003
    ..This study presents evidence for adrenocortical involvement in avian pair bonding, and for hypothalamic-pituitary-adrenal activation in response to an ecologically relevant social stressor...
  50. ncbi request reprint Effect of polar day on plasma profiles of melatonin, testosterone, and estradiol in high-Arctic Lapland Longspurs
    Michaela Hau
    Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey 08544, USA
    Gen Comp Endocrinol 126:101-12. 2002
    ..The data suggest that even under polar day conditions diel rhythms can persist. The maintenance of hormone rhythms could provide a physiological basis to reports of rhythmic behavior in many birds during the Arctic summer...
  51. ncbi request reprint Steroid hormone interrelationships with territorial aggression in an Arctic-breeding songbird, Gambel's white-crowned sparrow, Zonotrichia leucophrys gambelii
    Simone L Meddle
    Department of Zoology, University of Washington, Seattle 98195, USA
    Horm Behav 42:212-21. 2002
    ..Z. l. gambelii retain sensitivity to corticosterone levels that may occur naturally in response to environmental perturbations resulting in suppression of territorial behavior...
  52. ncbi request reprint Behavioral and physiological adjustments to new predators in an endemic island species, the Galápagos marine iguana
    Silke Berger
    Institute of Experimental Ecology, University of Ulm, Albert Einstein Allee 11, 89069 Ulm, Germany
    Horm Behav 52:653-63. 2007
    ..However, the adjustments in FID are not sufficient to cope with the novel predators. We suggest that low behavioral plasticity in the face of introduced predators may drive many island species to extinction...
  53. pmc Tameness and stress physiology in a predator-naive island species confronted with novel predation threat
    Thomas Rödl
    Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA
    Proc Biol Sci 274:577-82. 2007
    ..In general, we predict that island endemics show flexible physiological stress responses but are restricted by narrow behavioural plasticity...
  54. ncbi request reprint Corticosterone suppresses immune activity in territorial Galápagos marine iguanas during reproduction
    Silke Berger
    Department of Experimental Ecology, University of Ulm, Albert Einstein Allee 11, 89069 Ulm, Germany
    Horm Behav 47:419-29. 2005
    ..Our data show that cort can induce immunosuppression, but they do not support the immunocompetence handicap hypothesis in its narrow sense because T concentrations were not related to immunosuppression...