L M Romero

Summary

Affiliation: Tufts University
Country: USA

Publications

  1. 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
  2. ncbi request reprint Season and migration alters the corticosterone response to capture and handling in an Arctic migrant, the white-crowned sparrow (Zonotrichia leucophrys gambelii)
    L M Romero
    Department of Zoology, University of Washington, Seattle 98195, USA
    Comp Biochem Physiol C Pharmacol Toxicol Endocrinol 116:171-7. 1997
  3. 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
  4. 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
  5. pmc Corticosterone levels predict survival probabilities of Galapagos marine iguanas during El Nino events
    L M Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Proc Natl Acad Sci U S A 98:7366-70. 2001
  6. ncbi request reprint Regulation of the hypothalamic-pituitary-adrenal axis in free-living pigeons
    L M Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    J Comp Physiol B 171:231-5. 2001
  7. ncbi request reprint Effects of weather on corticosterone responses in wild free-living passerine birds
    L M Romero
    Department of Biology, Tufts University, Medford, Massachusetts, 02155, USA
    Gen Comp Endocrinol 118:113-22. 2000
  8. ncbi request reprint Alterations in hypothalamic-pituitary-adrenal function associated with captivity in Gambel's white-crowned sparrows (Zonotrichia leucophrys gambelii)
    L M Romero
    Department of Zoology, University of Washington, Seattle 98195, USA
    Comp Biochem Physiol B Biochem Mol Biol 122:13-20. 1999
  9. ncbi request reprint Neurally active stress peptide inhibits territorial defense in wild birds
    L M Romero
    Department of Zoology, University of Washington, Seattle, Washington, 98195, USA
    Horm Behav 34:239-47. 1998
  10. ncbi request reprint Changes in pituitary and adrenal sensitivities allow the snow bunting (Plectrophenax nivalis), an Arctic-breeding song bird, to modulate corticosterone release seasonally
    L M Romero
    Department of Zoology, University of Washington, Seattle 98195, USA
    J Comp Physiol B 168:353-8. 1998

Detail Information

Publications45

  1. 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...
  2. ncbi request reprint Season and migration alters the corticosterone response to capture and handling in an Arctic migrant, the white-crowned sparrow (Zonotrichia leucophrys gambelii)
    L M Romero
    Department of Zoology, University of Washington, Seattle 98195, USA
    Comp Biochem Physiol C Pharmacol Toxicol Endocrinol 116:171-7. 1997
    ..Furthermore, birds caught in Washington state during spring migration had intermediate levels of both nonstressed and stress-induced corticosterone. Corticosterone release may function differently during spring and fall migrations...
  3. 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...
  4. 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...
  5. pmc Corticosterone levels predict survival probabilities of Galapagos marine iguanas during El Nino events
    L M Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Proc Natl Acad Sci U S A 98:7366-70. 2001
    ..Our results lend support to the use of corticosterone as a rapid quantitative predictor of survival in wild animal populations...
  6. ncbi request reprint Regulation of the hypothalamic-pituitary-adrenal axis in free-living pigeons
    L M Romero
    Department of Biology, Tufts University, Medford, MA 02155, USA
    J Comp Physiol B 171:231-5. 2001
    ..Overall, these data indicate that pigeons regulate their corticosterone release differently during molt than other avian species studied to date...
  7. ncbi request reprint Effects of weather on corticosterone responses in wild free-living passerine birds
    L M Romero
    Department of Biology, Tufts University, Medford, Massachusetts, 02155, USA
    Gen Comp Endocrinol 118:113-22. 2000
    ....
  8. ncbi request reprint Alterations in hypothalamic-pituitary-adrenal function associated with captivity in Gambel's white-crowned sparrows (Zonotrichia leucophrys gambelii)
    L M Romero
    Department of Zoology, University of Washington, Seattle 98195, USA
    Comp Biochem Physiol B Biochem Mol Biol 122:13-20. 1999
    ..Captivity thus appears to have a profound affect on the function of the HPA axis, and these results reiterate the caution that must be used to extrapolate laboratory data to field conditions...
  9. ncbi request reprint Neurally active stress peptide inhibits territorial defense in wild birds
    L M Romero
    Department of Zoology, University of Washington, Seattle, Washington, 98195, USA
    Horm Behav 34:239-47. 1998
    ..Centrally acting CRF, however, significantly reduced territorial defense whereas centrally acting AVT had no effect. These results indicate that the behavioral affects of peptides can be studied under natural conditions...
  10. ncbi request reprint Changes in pituitary and adrenal sensitivities allow the snow bunting (Plectrophenax nivalis), an Arctic-breeding song bird, to modulate corticosterone release seasonally
    L M Romero
    Department of Zoology, University of Washington, Seattle 98195, USA
    J Comp Physiol B 168:353-8. 1998
    ..Taken together, these results indicate that seasonal modulation of corticosterone release in this species is controlled at both the adrenal and pituitary glands...
  11. ncbi request reprint Seasonal changes in adrenal sensitivity alter corticosterone levels in Gambel's white-crowned sparrows (Zonotrichia leucophrys gambelii)
    L M Romero
    Department of Biology, Tufts University, Medford, Massachusetts 02155, USA
    Comp Biochem Physiol C Pharmacol Toxicol Endocrinol 119:31-6. 1998
    ..Taken together, these results suggest that seasonal modulation of corticosterone release in this species is controlled primarily at the adrenal...
  12. ncbi request reprint A novel stereotaxic-like method for injecting into the lateral ventricles of small passerine birds
    L M Romero
    Department of Zoology, University of Washington, Seattle 98195, USA
    Physiol Behav 62:1109-12. 1997
    ..Colchicine decreased the content of newly synthesized protein in the median eminence, thus suggesting that colchicine inhibited protein transport. The technique should prove useful in a number of neurobiologial applications...
  13. ncbi request reprint The hypothalamus and adrenal regulate modulation of corticosterone release in redpolls (Carduelis flammea--an arctic-breeding song bird)
    L M Romero
    Department of Zoology, University of Washington, Seattle, Washington 98195, USA
    Gen Comp Endocrinol 109:347-55. 1998
    ....
  14. ncbi request reprint Diel rhythms of basal and stress-induced corticosterone in a wild, seasonal vertebrate, Gambel's white-crowned sparrow
    C W Breuner
    Department of Zoology, University of Washington, Seattle, Washington 98195, USA
    J Exp Zool 284:334-42. 1999
    ..Patterns of CORT secretion were similar under both photoperiods. These patterns show interesting similarities and differences to classical mammalian rhythms...
  15. ncbi request reprint Corticosterone and insulin interact to regulate glucose and triglyceride levels during stress in a bird
    L Remage-Healey
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Am J Physiol Regul Integr Comp Physiol 281:R994-1003. 2001
    ..No response to either hormone showed photoperiodic differences. These data suggest that corticosterone's role in metabolism changes to meet varying energetic demands throughout the day...
  16. doi request reprint Chronic stress alters glucocorticoid receptor and mineralocorticoid receptor mRNA expression in the European starling (Sturnus vulgaris) brain
    M Dickens
    Department of Biology, Tufts University, Medford, MA 02155, USA
    J Neuroendocrinol 21:832-40. 2009
    ....
  17. ncbi request reprint Daily and photoperiod variations of basal and stress-induced corticosterone concentrations in house sparrows (Passer domesticus)
    E L Rich
    Department of Biology, Tufts University, Medford, MA 02155, USA
    J Comp Physiol B 171:543-7. 2001
    ..Therefore, these data indicate that captive house sparrows modulate corticosterone in daily cycles that change in response to photoperiod...
  18. doi request reprint Chronic psychological stress alters body weight and blood chemistry in European starlings (Sturnus vulgaris)
    J L Awerman
    Department of Biology, Tufts University, Medford, MA 02155, USA
    Comp Biochem Physiol A Mol Integr Physiol 156:136-42. 2010
    ..In summary, protein metabolism appeared to mediate weight loss during chronic stress, but over-gaining weight was not a good indicator of recovery...
  19. 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...
  20. 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...
  21. 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...
  22. 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...
  23. 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...
  24. 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
    ....
  25. 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...
  26. 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...
  27. 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...
  28. 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
    ....
  29. doi 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...
  30. doi 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...
  31. doi 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...
  32. 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...
  33. 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...
  34. 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...
  35. 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...
  36. 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...
  37. 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...
  38. 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
    ....
  39. 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
    ....
  40. 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...
  41. 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...
  42. 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...
  43. 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
    ....
  44. 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...
  45. 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...