Hõrak, P., Männiste, M. (2015) Viability selection affects black but not yellow plumage colour in greenfinches. – Oecologia (in press).
Hõrak, P., Valge, M. (2015). Why did children grow so well at hard times? The ultimate importance of pathogen control during puberty. – Evolution, Medicine, and Public Health, 167-178. (doi:10.1093/emph/eov017). PDF for download
Visse, M., Sild, E., Kesler, M., Saks, L., Hõrak, P. (2015) Do Atlantic salmon parr trade growth against immunity? – Marine and Freshwater Behaviour and Physiology (in press). /doi/full/10.1080/10236244.2015.1035536.
Rattiste, K.; Klandorf, H.; Urvik, J. ; Sepp, T.; Asghar, M.; Hasselquist, D.; Cooey, C.; Hõrak, P. (2015) Skin pentosidine and telomere length do not covary with age in a long-lived seabird. – Biogerontology (in press). DOI: 10.1007/s10522-015-9564-1
Moore, F.R.; Cīrule, D.; Kivleniece, I.; Vrublevska, J.; Rantala, M.J.; Sild, E.; Sepp, T.; Hõrak, P.; Krama, T.; Krams, I. (2015) Investment in a sexual signal results in reduced survival under extreme conditions in the male great tit (Parus major). – Behavioral Ecology and Sociobiology 69: 151-158. DOI: 10.1007/s00265-014-1828-2
Meitern, R., Andreson, R. & Hõrak, P. (2014) Profile of whole blood gene expression following immune stimulation in a wild passerine. BMC Genomics 15, 533. PDF for download
Sild, E., Meitern, R., Männiste, M., Karu, U. & Hõrak, P. (2014) High feather corticosterone indicates better coccidian infection resistance in greenfinches. General and Comparative Endocrinology 204: 203-210. http://dx.doi.org/10.1016/j.ygcen.2014.05.026
Kilk, K., Meitern,
R., Härmson, O., Soomets,
U. & Hõrak, P. (2014) Assessment of oxidative stress in serum by the d-ROMs
test. Free Radical
Research 48: 883-889.
DOI: 10.3109/10715762.2014.919390
Sepp, T., Männiste,
M., Kaasik, A., Hõrak, P. (2014) Multidimensionality
of fear in captive greenfinches (Carduelis
chloris). Behavioral Ecology and Sociobiology 68: 1173-1181 DOI: 10.1007/s00265-014-1728-5
Männiste, M., Hõrak, P. (2014) Emerging infectious disease selects for darker
plumage coloration in greenfinches. Frontiers in Ecology
and Evolution - Behavioral and Evolutionary Ecology 2: doi:
10.3389/fevo.2014.00004
Hõrak, P., Männiste, M., Meitern,
R., Sild, E., Saks, L., Sepp, T. (2013) Dexamethasone inhibits corticosterone
deposition in feathers of greenfinches. General
and Comparative Endocrinology 191:
210-214 http://dx.doi.org/10.1016/j.ygcen.2013.07.002
Meitern, R., Sild, E., Lind, M.-A., Männiste, M., Sepp, T., Karu, U., Hõrak, P. (2013). Effects of endotoxin and psychological stress on redox physiology, immunity and feather corticosterone in greenfinches. – PloS ONE 8 (6):e67545 PDF for download
Männiste M, Sepp T, Hõrak P (2013) Locomotor activity of captive greenfinches
involves two different behavioural traits. Ethology 119: 581-591 DOI: 10.1111/eth.12099
Meitern R, Sild E, Kilk K, Porosk
R, Hõrak P (2013) On the methodological limitations of
detecting oxidative stress: effects of paraquat on
measures of oxidative status in greenfinches. Journal of
Experimental Biology 216: 2713-2721 PDF for download
Krams I, Vrublevska J, Cīrule
D, Kivleniece I, Krama T, Rantala MJ, Kaasik A, Hõrak P,
Sepp T (2013) Stress, behaviour and immunity in
wild-caught wintering great tits (Parus
major). Ethology:119: 397–406.
Sepp, T., Karu, U., Blount, J., Sild, E., Männiste, M., Hõrak, P. (2012) Coccidian infection causes
oxidative damage in greenfinches. PLoS ONE 7 (5):e36495. PDF for download
Sepp, T., Sild, E., Blount, J., Männiste, M., Karu, U. &
Hõrak, P. (2012) Individual
consistency and covariation of measures of oxidative status in greenfinches. – Physiological and
Biochemical Zoology 85:299-307
Krams, I., Vrublevska, J., Cirule,
D., Kivleniece, I., Krama,
T., Rantala, M.J., Sild, E., Hõrak, P. (2012) Heterophil/lymphocyte ratios predict the magnitude of
humoral immune response to a novel antigen in great tits (Parus
major). – Comparative Biochemistry and Physiology A 161:422-428. DOI: 10.1016/j.cbpa.2011.12.018
Sild, E, Sepp, T, Männiste, M & Hõrak, P (2011) Carotenoid intake does not affect
immune-stimulated oxidative burst in greenfinches. Journal Of
Experimental Biology 214:3467-3473
Männiste, M. & Hõrak, P. (2011) Effects of
immune activation and glucocorticoid administration on feather growth in
greenfinches Journal of
Experimental Zoology Part A: Ecological Genetics and Physiology 315A: 527-535 DOI: 10.1002/jez.701
Sild, E., Sepp, T.
& Hõrak, P. (2011) Behavioural trait covaries
with immune responsiveness in a wild passerine. Brain
Behavior and Immunity 25, 1349-1354 doi:10.1016/j.bbi.2011.03.020
Lõhmus,
M., Sild, E., Hõrak, P. & Björklund, M. (2011) Effects of chronic leptin
administration on nitric oxide production and immune responsiveness of
greenfinches. Comparative Biochemistry
and Physiology - A Molecular and Integrative Physiology, 158, 560-565. doi:10.1016/j.cbpa.2011.01.002
Sepp,
T., Karu, U., Sild, E., Männiste, M. & Hõrak, P. (2011) Effects of
carotenoids, immune activation and immune suppression on the intensity of
chronic coccidiosis in greenfinches. Experimental
Parasitology, 127, 651-657. doi:10.1016/j.exppara.2010.12.004
Sild, E. & Hõrak,
P. (2010) Assessment of oxidative burst in
avian whole blood samples: validation and application of a chemiluminescence
method based on Pholasin. Behavioral Ecology and Sociobiology 64,
2065-2076
Kilgas, P., Tilgar, V., Külavee,
R., Saks, L., Hõrak, P. & Mänd, R. (2010)
Antioxidant protection, immune function and growth of nestling great tits Parus major in relation to within-brood hierarchy. Comparative
Biochemistry and Physiology Part B: Biochemistry and Molecular Biology 157, 288-293.
McGraw, K.J., Cohen,
A.A., Costantini, D. & Hõrak, P. (2010) The ecological significance of antioxidants and oxidative
stress: a marriage between mechanistic and functional perspectives. Functional
Ecology 24, 947-949.
Hõrak, P. & Cohen A. (2010) How to measure oxidative stress in an
ecological context: methodological and statistical issues. – Functional
Ecology 24, 960-970.
Hõrak, P., Sild, E., Soomets,
U., Sepp, T. & Kilk, K. (2010) Oxidative stress and
information content of black and yellow plumage coloration: an experiment with
greenfinches. – Journal of
Experimental Biology 213: 2225-2233 © The
Company of Biologists PDF for download
Sepp, T., Sild, E. & Hõrak, P.(2010) Hematological condition indices in greenfinches: effects
of captivity and diurnal variation. – Physiological
and Biochemical Zoology 83: 276-282
Sarv, T. & Hõrak, P. (2009) Phytohaemagglutinin injection has a long-lasting
effect on immune cells. Journal of Avian Biology 40:
569-571 PDF for download
Sild, E. & Hõrak,
P. (2009) Nitric oxide production: an easily measurable condition index for
vertebrates. Behavioral
Ecology and Sociobiology 63:
959-966.
Karu, U., Saks, L. & Hõrak, P. (2008) Carotenoid-based plumage coloration
is not affected
by vitamin E supplementation in male greenfinches. Ecological Research 23: 931-935 © 2008 The Ecological Society of Japan PDF for download
Hõrak, P., Saks, L., Zilmer, M., Karu, U. & Zilmer,
K. (2007) Do dietary antioxidants alleviate the cost of immune
activation? An experiment with greenfinches. American Naturalist 170, 625-635 © 2007 by The University
of Chicago PDF for download
Karu, U., Saks, L. & Hõrak, P. (2007) Carotenoid coloration in greenfinches is individually consistent irrespective of foraging ability. Physiological & Biochemical Zoology 80, 663-670. © 2007 by The University
of Chicago PDF for download.
Please read also ERRATUM (PDF
for download) for
this paper – we are really sorry for this
mess!
Hõrak, P., Zilmer, M., Saks, L., Ots, I., Karu, U. & Zilmer, K. (2006) Antioxidant protection, carotenoids, and the costs of immune challenge in greenfinches.
Journal of Experimental Biology 209, 4329-4338 © The Company of Biologists PDF for download
Tummeleht, L., Mägi, M., Kilgas,
P., Mänd, R. & Hõrak, P. (2006) Antioxidant
protection and plasma carotenoids of incubating great tits (Parus major L.) in relation to health state and breeding conditions Comparative Biochemistry and Physiology, Part C 144,
166-172
Saks, L., Karu, U., Ots,
I. & Hõrak, P. (2006) Do standard measures of immunocompetence reflect parasite resistance? The case of greenfinch coccidiosis Functional Ecology 20,
75-82.
Hõrak, P., Tummeleht, L. & Talvik, H. (2006) Predictors
and markers of resistance to neurotropic nematode infection in rodent host Parasitology Research 98, 396-402 © Springer
PDF for download
Hõrak, P., Tummeleht, L. & Talvik, H. (2006) Predator
threat, copulation effort, and immunity in male rats (Rattus norvegicus) Journal of Zoology 268, 9-16
© The Zoological Society of London and Blackwell Publishing PDF for download
Hõrak P., Saks L., Karu
U. & Ots I. (2006) Host resistance and parasite virulence in greenfinch coccidiosis
Journal of Evolutionary Biology 19, 277-288 © 2005 European
Society for Evolutionary Biology PDF for download
Hõrak P., Saks L., Karu
U., Ots I., Surai P. F., & McGraw,
K. J. (2004) How coccidian parasites affect health and appearance of greenfinches. Journal of Animal Ecology 73, 935-937
Hõrak, P., Surai, P. F., Ots, I. & Møller,
A. P. (2004) Fat soluble antioxidants in brood-rearing great tits: relations to health
and appearance. Journal of Avian Biology 35, 63-70. PDF for download
Freitak, D., Ots, I., Vanatoa, A. & Hõrak, P. (2003) Immune
response is energetically costly in white cabbage
butterfly pupae. Proceedings of the Royal Society of London Series B Supplementum (Biology Letters) 270,
S220-222.
Hõrak, P. & Saks, L.
(2003) Animal allure and health linked by
plant pigments. BioEssays 25,
746-747.
Saks, L., McGraw, K. J. M. & Hõrak, P. (2003) How feather colour
reflects its carotenoid content. Functional Ecology 17,
555-561.
Hõrak, P. (2003) When to pay
the cost of reproduction? A brood size manipulation experiment in great
tits (Parus major). Behavioral Ecology and Sociobiology 54, 105-112.
Hõrak, P., Saks, L., Ots,
I., Kullisaar, T., Kollist, H. & Zilmer, M.
(2003) Physiological effects
of immune challenge in captive greenfinches
(Carduelis chloris). Canadian Journal of Zoology 81, 371-379.
Saks, L., Ots, I.,
Hõrak, P. (2003) Carotenoid-based plumage
coloration of male greenfinches
reflects health and immunocompetence. Oecologia 134, 301-307.
Hõrak, P., Surai, P. F. & Møller, A. P.
(2002) Fat-soluble antioxidants
in the eggs
of great tits Parus
major in relation to breeding habitat
and laying sequence. Avian
Science 2, 123-130 PDF
for download
Hõrak, P., Saks, L.,
Ots, I. & Kollist, H. (2002) Repeatability of condition indices in captive greenfinches
(Carduelis chloris). Canadian Journal of Zoology 80, 636-643.
Ots, I., Kerimov, A. B, Ivankina, E. V., Ilyina, T. A., Hõrak, P. (2001) Immune
challenge affects basal metabolic
activity in wintering great tits. Proceedings of the Royal Society of London Series B 268, 1475-1482.
Hõrak, P., Ots, I., Vellau, H., Spottiswoode, C.
& Møller, A. P. (2001) Carotenoid-based
plumage coloration reflects hemoparasite infection and local survival in breeding
great tits. Oecologia 123, 166-173.
Hõrak, P.,Vellau, H., Ots, I., & Møller,
A. P. (2000) Growth conditions
affect carotenoid-based plumage coloration of great tit nestlings
Naturwissenschaften 87, 460-464.
Hõrak, P., Ots, I., Tegelmann, L. & Møller, A.P.
(2000) Health impact of phytohaemagglutinin-induced immune
challenge on great tit nestlings. Canadian Journal of Zoology 78, 905-910.
Hõrak, P., Tegelmann, L., Ots, I., & Møller,
A.P. (1999) Immune function
and survival of great tit nestlings in
relation to growth conditions. Oecologia 121, 316-322.
Hõrak, P., Jenni-Eiermann, S., & Ots, I. (1999) Do great tits (Parus major) starve
to reproduce? Oecologia 119, 293-299.
Tammaru, T. & Hõrak,
P. (1999) Should one invest more in
large broods? Not necessarily. Oikos 85, 574-81.
Hõrak, P., Ots, I.,
& Murumägi, A. (1998) Hematological health state indices
of reproducing Great Tits:
a response to brood size manipulation.
Functional Ecology 12 , 750-756.
Hõrak, P. & Lebreton, J.-D. (1998) Survival
of adult Great Tits in relation to
sex and habitat: a comparison of urban and rural populations. Ibis140,
205-209.
Hõrak, P., Jenni-Eiermann, S., Ots, I., & Tegelmann,
L. (1998) Health and reproduction:
sex-specific clinical
profile of Great Tits (Parus
major) in relation to breeding. Canadian
Journal of Zoology 76,
2235-2244.
Hõrak, P. & Ots, I.
(1998) Health state and local survival in the Great
Tit. Biol. Cons. Fauna 102, 307-311.
Ots, I. & Hõrak, P.
(1998) Health impact of blood parasites in breeding great
tits. Oecologia 116, 441-448.
Ots, I., Murumägi, A.,
& Hõrak, P. (1998) Hematological health state indices
of reproducing Great Tits: methodology and sources of natural variation. Functional Ecology 12,
700-707.
Hõrak, P., Mänd, R.,
& Ots, I. (1997) Identifying targets
of selection: a multivariate
analysis of reproductive traits in the
Great Tit. Oikos 78, 592-600.
Hõrak, P. & Tammaru,
T. (1996) Between-year variation
in breeding conditions biases heritability estimates for body size
in birds. Ardea 84, 127-135.
Ots, I. & Hõrak, P.
(1996) Great Tits Parus
major trade health for reproduction. Proceedings of the Royal Society of London Series B 263,
1443-1447.
Hõrak, P., Mänd, R.,
Ots, I., & Leivits, A. (1995) Egg
size variation in the Great
Tit: individual, habitat and geographic differences. Ornis
Fennica 73,
97-114.
Hõrak, P. (1995) Brood reduction facilitates female but not offspring
survival in the great tit.
Oecologia 102,
515-519.
Hõrak, P. (1994) Effect of nestling history on adult size and reproduction in the Great
Tit. Ornis Fennica 71, 47-54. PDF for download
Hõrak, P. (1993) Low fledging success
of urban Great Tits. Ornis Fennica 70,
168-172.