
Crofton, H. D. A quantitative approach to parasitism. Parasitology 62, 179–193 (1971).
Shaw, D. J. & Dobson, A. P. Patterns of macroparasites abundance and aggregation in wildlife populations: a quantitative review. Parasitology 111, S111–S133 (1995).
Wilson, K. et al. Heterogeneities in macroparasite infections: patterns and processes. In The Ecology of Wildlife Diseases (eds. Hudson, P. J., Rizzoli, A., Grenfell, B. T., Heesterbeek, H. & Dobson, A. P.) 6–44 (Oxford University Press, 2002).
Poulin, R. Are there general laws in parasite ecology? Parasitology 134, 763–776 (2007).
MacIntosh, A. J. J., Hernandez, A. D. & Huffman, M. A. Host age, sex, and reproductive seasonality affect nematode parasitism in wild Japanese macaques. Primates 51, 353–364 (2010).
Craig, B. H., Pilkington, J. G. & Pemberton, J. M. Gastrointestinal nematode species burdens and host mortality in a feral sheep population. Parasitology 133, 485–96 (2006).
Craig, B. H., Jones, O. R., Pilkington, J. G. & Pemberton, J. M. Re-establishment of nematode infra-community and host survivorship in wild Soay sheep following anthelmintic treatment. Vet. Parasitol. 161, 47–52 (2009).
Festa-Bianchet, M. Individual Differences, Parasites, and the Costs of Reproduction for Bighorn Ewes (Ovis canadensis). J. Anim. Ecol. 58, 785–795 (1989).
Ferrari, N., Cattadori, I., Rizzoli, A. & Hudson, P. J. Heligmosomoides polygrus reduces infestation of Ixodes ricinus in free-living yellow-necked mice, Apodemus flavicollis. Parasitology 136, 305–316 (2009).
Ferrari, N., Cattadori, I., Nespereira, J., Rizzoli, A. & Hudson, P. J. The role of host sex in parasite dynamics: field experiments on the yellow-necked mouse Apodemus flavicollis. Ecol. Lett 7, 88–94 (2004).
Grzybek, M., Bajer, A., Behnke-Borowczyk, J., Al-Sarraf, M. & Behnke, J. M. Female host sex-biased parasitism with the rodent stomach nematode Mastophorus muris in wild bank voles (Myodes glareolus). Parasitol. Res. 114, 523–533 (2014).
Hamilton, W. D. & Zuk, M. Heritable true fitness and bright birds: A role for parasites? Science (80). 218, 384–387 (1982).
Sol, D., Jovani, R. & Torres, J. Parasite mediated mortality and host immune response explain age-related differences in blood parasitism in birds. Oecologia 135, 542–547 (2003).
Hudson, P. J. & Dobson, A. P. Macroparasites: observed patterns. in Ecology of infectious Diseases in Natural Populations (eds. Grenfell, B. T. & Dobson, A. P.) 144–176 (Cambridge University Press, 1995).
Beck, M. A., Goater, C. P., Colwell, D. D. & van Paridon, B. J. Fluke abundance versus host age for an invasive trematode (Dicrocoelium dendriticum) of sympatric elk and beef cattle in southeastern Alberta, Canada. Int. J. Parasitol. Parasites Wildl. 3, 263–268 (2014).
Tinsley, R. et al. Acquired immunity protects against helminth infection in a natural host population: Long-term field and laboratory evidence. Int. J. Parasitol. 42, 931–938 (2012).
Simon, A. K., Hollander, G. A. & Mcmichael, A. Evolution of the immune system in humans from infancy to old age. Proc. R. Soc. B Biol. Sci. 282, 20143085 (2015).
MacIntosh, A. J. J. et al. Monkeys in the Middle: Parasite Transmission through the Social Network of a Wild Primate. PLoS One 7, 15–21 (2012).
Setchell, J. M. et al. Parasite Prevalence, Abundance, and Diversity in a Semi-free-ranging Colony of Mandrillus sphinx. Int. J. Primatol. 28, 1345–1362 (2007).
Norris, K. & Evans, M. R. Ecological immunology: life history trade-offs and immune defense in birds. Behav. Ecol 11, 19–26 (1999).
Trivers, R. Parental investment and sexual selection. in Sexual Selection and the Descent of Man 1871 – 1971 (ed. Campbell, B.) 136–179, https://doi.org/10.1002/ajpa.1330400226 (Aldine-Atherton, 1972).
Lahdenperä, M., Mar, K. U. & Lummaa, V. Nearby grandmother enhances calf survival and reproduction in Asian elephants. Sci. Rep. 6, 27213 (2016).
Zuk, M. & Stoehr, A. M. Immune Defense and Host Life History. Am. Nat. 160, S9–S22 (2002).
Zahavi, A. Mate selection-A selection for a handicap. J. Theor. Biol. 53, 205–214 (1975).
Foo, Y. Z., Nakagawa, S., Rhodes, G. & Simmons, L. W. The effects of sex hormones on immune function: a meta-analysis. Biol. Rev. 92, 551–57 (2017).
Stearns, S. The Evolution of Life Histories. (Oxford University Press, 1992).
Agnew, P. & Koella, J. C. Life history interactions with environmental conditions in a host-parasite relationship and the parasite’s mode of transmission. Evol. Ecol. 13, 67–89 (1999).
Ebert, D., Carius, H. J., Little, T. & Decaesteckerl, E. The Evolution of Virulence When Parasites Cause Host Castration and Gigantism. Am. Nat. 164, S19–S32 (2004).
Gittleman, J. L. Energy Allocation in Mammalian Reproduction. Integr. Comp. Biol. 28, 863–875 (1988).
Stien, A. et al. The impact of gastrointestinal nematodes on wild reindeer: Experimental and cross-sectional studies. J. Anim. Ecol. 71, 937–945 (2002).
Pelletier, F., Page, K. A., Ostiguy, T. & Festa-Bianchet, M. Fecal counts of lungworm larvae and reproductive effort in bighorn sheep, Ovis canadensis. Oikos 110, 473–480 (2005).
Barger, I. A. Influence of sex and reproductive status on susceptibility of ruminants to nematode parasitism. Int. J. Parasitol. 23, 463–469 (1993).
Catalano, S. et al. Helminths of grizzly bears (Ursus arctos) and American black bears (Ursus americanus) in Alberta and British Columbia, Canada. Can. J. Zool. 93, 765–772 (2015).
Cizauskas, C. A., Turner, W. C., Pitts, N. & Getz, W. M. Seasonal Patterns of Hormones, Macroparasites, and Microparasites in Wild African Ungulates: The Interplay among Stress, Reproduction, and Disease. PLoS One 10, 1–29 (2015).
Halvorsen, O. & Bye, K. Parasites, biodiversity, and populatoin dynamics in an ecosystem in the high arctic. Vet. Parasitol. 84, 205–227 (1999).
Labes, E. M. et al. Intestinal parasites of endangered orangutans (Pongo pygmaeus) in Central and East Kalimantan, Borneo, Indonesia. Parasitology 137, 123–135 (2010).
Cooper, N., Kamilar, J. M. & Nunn, C. L. Host longevity and parasite species richness in mammals. PloS One 7 (2012).
King, I. L. & Li, Y. Host-parasite interactions promote disease tolerance to intestinal helminth infection. Front. Immunol. 9, 2128 (2018).
Barthelemy, M., Gabrion, C. & Petit, G. Reduction in testosterone concentration and its effect on the reproductive output of chronic malaria-infected male mice. Parasitol. Res. 93, 475–481 (2004).
Albon, S. D. et al. The role of parasites in the dynamics of a reindeer population. Proc. R. Soc. B Biol. Sci. 269, 1625–1632 (2002).
Tompkins, D. M., Dunn, A. D., Smith, M. J. & Telfer, S. Wildlife diseases: from individuals to ecosystems. J. Anim. Ecol 80, 19–38 (2011).
Clubb, R. et al. Compromised survivorship, fecundity and population persistence in zoo elephants. Science 322, 1649–1649 (2008).
Toke Gale, U. Burmese Timber Elephant. (Trade Corporation, 1974).
Fowler, M. E. & Mikota, S. K. Biology, Medicine, and Surgery of Elephants. (Blackwell Publishing, 2006).
Lynsdale, C. L. et al. A standardised faecal collection protocol for intestinal helminth egg counts in Asian elephants, Elephas maximus. Int. J. Parasitol. Parasites Wildl. 4, 307–315 (2015).
Lynsdale, C. L., Mumby, H. S., Hayward, A. D., Mar, K. U. & Lummaa, V. Parasite-associated mortality in a long-lived mammal: Variation with host age, sex, and reproduction. Ecol. Evol. 7 (2017).
Nielsen, M. K. et al. American Association of Equine Practitioners: AAEP Parasite Control Guidelines. (2013). Available at, http://www.aaep.org/info/parasite-control-guidelines-231. (Accessed: 1st January 2017).
Galvani, A. P. Age-dependent epidemiological patterns and strain diversity in helminth parasites. J. Parasitol. 91, 24–30 (2005).
Cheynel, L. et al. Immunosenescence patterns differ between populations but not between sexes in a long-lived mammal. Sci. Rep. 7, 1–11 (2017).
Nussey, D. H., Watt, K., Pilkington, J. G., Zamoyska, R. & Mcneilly, T. N. Age-related variation in immunity in a wild mammal population. Aging Cell 11, 178–180 (2012).
Watve, M. G. & Sukumar, R. Parasite abundance and diversity in mammals – Correlates with host ecology. Proc. Natl. Acad. Sci. U. S. A. 92, 8945–8949 (1995).
Baines, L., Morgan, E. R., Ofthile, M. & Evans, K. Occurrence and seasonality of internal parasite infection in elephants, Loxodonta africana, in the Okavango Delta, Botswana. Int. J. Parasitol. Parasites Wildl. 4, 43–48 (2015).
Parker, J. M., Goldenberg, S. Z., Letitiya, D. & Wittemyer, G. Strongylid infection varies with age, sex, movement, and social factors in wild African elephants. Parasitology 147, 348–359 (2020).
Thurber, M. et al. Effects of rainfall, host demography, and musth on strongyle faecal egg counts in African elephants (Loxodonta africana) in Namibia. J. Wildl. Dis. 47, 172–181 (2011).
Zuk, M. & McKean, K. A. Sex Differences in Parasite Infections: Patterns and Processes. Int. J. Parasitol 26, 1009–1024 (1996).
Godfrey, S. S. Networks and the ecology of parasite transmission: A framework for wildlife parasitology. Int. J. Parasitol. Parasites Wildl. 2, 235–245 (2013).
Roberts, M. L., Buchanan, K. L. & Evans, M. R. Testing the immunocompetence handicap hypothesis: a review of the evidence. Anim. Behav. 68, 227–239 (2004).
Balenger, S. L. & Zuk, M. Testing the Hamilton-Zuk hypothesis: past, present, and future. Integr. Comp. Biol. 54, 601–613 (2014).
Warburton, E. M., Pearl, C. A. & Vonhof, M. J. Relationships between host body condition and immunocompetence, not host sex, best predict parasite burden in a bat-helminth system. Parasitol. Res. 115, 2155–2164 (2016).
Sukumar, R. The Living Elephants: Evolutionary Ecology, Behaviour, and Conservation. (Oxford University Press, 2003).
East, M. L. et al. Does lactation lead to resource allocation trade-offs in the spotted hyaena? Behav. Ecol. Sociobiol. 69, 805–814 (2015).
Hayward, A. D., Pilkington, J. G., Pemberton, J. M. & Kruuk, L. E. B. Maternal effects and early-life performance are associated with parasite resistance across life in free-living Soay sheep. Parasitology 137, 1261–1273 (2010).
Mpairwe, H., Tweyongyere, R. & Elliott, A. Pregnancy and helminth infections. Parasite Immunol. 36, 328–337 (2014).
Mar, K. U. The Demography and Life History Strategies of Timber Elephants in Myanmar. (PhD thesis, University College London, 2007).
Crawley, J. A. H. et al. Is bigger better? The relationship between size and reproduction in female Asian elephants. J. Evol. Biol. 30, 1836–1845 (2017).
Smith, M. J. et al. Disease effects on reproduction can cause population cycles in seasonal environments. J. Anim. Ecol. 77, 378–389 (2008).
Oo, Z. M. Health Issues of Captive Asian Elephants in Myanmar. Gajah 36, 21–22 (2012).
Oo, Z. M., Kyaw, W. O. M., Nyunt, T. & Khaing, A. T. The Occurrence of Micro laria and the Response of Microlaria and Gut Nematodes to Ivermectin Therapy in Myanmar Timber Elephants. Gajah 31, 40–45 (2009).
Wiese, R. J. & Willis, K. Calculation of longevity and life expectancy in captive elephants. Zoo Biol. 23, 365–373 (2004).
Arivazhagan, C. & Sukumar, R. Constructing age structures of Asian elephant populations: A comparison of two field methods of age estimation. Gajah 11–16 (2008).
MAFF. Manual of Veterinary Parasitological Laboratory Techniques. (Her Majesty’s Stationary Office (HMSO), 1986).
Taylor, M. A., Coop, R. L. & Wall, R. L. Veterinary Parasitology. (Blackwell Publishing, 2007).
Schindelin, J., Arganda-Carreras, I., Frise, E. & Al., E. Fiji: an open-source platform for biological-image analysis. Nat. Methods 9, 676–682 (2012).
Denwood, M. J. et al. Quantifying the sources of variability in equine faecal egg counts: Implications for improving the utility of the method. Veterinary Parasitology 188, 120–126 (2012).
Zajac, A. M. & Conboy, G. A. Veterinary Clinical Parasitology., https://doi.org/10.1073/pnas.0703993104 (Wiley-Blackwell, 2012).
R Core Development Team. R: A language and environment for statistical computing. Available at, http://www.r-project.org/ (2016).
Bates, D., Maechler, M., Bolker, B. & Walker, S. Fitting Linear Mixed-effects Models Using lme4. J. Stat. Softw. 67, 1–48 (2015).
Lahdenperä, M., Mar, K. U. & Lummaa, V. Reproductive cessation and post-reproductive lifespan in Asian elephants and pre-industrial humans. Front. Zool. 11, 54 (2014).
Stoffel, M. A., Nakagawa, S. & Schielzeth, H. rptR: repeatability estimation and variance decomposition by generalized linear mixed-effects models. Methods Ecol. Evol. 8, 1639–1644 (2017).
Knowles, J. E. & Frederick, C. merTools: Tools for Analyzing Mixed Effect Regression Models. (2015).
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