Abstract
Biodiversity is not distributed homogeneously in space, and it often covaries with productivity. The shape of the relationship between diversity and productivity, however, varies from a monotonic linear increase to a hump-shaped curve with maximum diversity values corresponding to intermediate productivity. The system studied and the spatial scale of study may affect this relationship. Parasite communities are useful models to test the productivity-diversity relationship because they consist of species belonging to a restricted set of higher taxa common to all host species. Using total parasite biovolume per host individual as a surrogate for community productivity, we tested the relationship between productivity and species richness among assemblages of metazoan parasites in 131 vertebrate host species. Across all host species, we found a linear relationship between total parasite biovolume and parasite species richness, with no trace of a hump-shaped curve. This result remained after corrections for the potential confounding effect of the number of host individuals examined per host species, host body mass, and phylogenetic relationships among host species. Although weaker, the linear relationship remained when the analyses were performed within the five vertebrate groups (fish, amphibians, reptiles, mammals and birds) instead of across all host species. These findings agree with the classic isolationist-interactive continuum of parasite communities that has become widely accepted in parasite ecology. They also suggest that parasite communities are not saturated with species, and that the addition of new species will result in increased total parasite biovolume per host. If the number of parasite species exploiting a host population is not regulated by processes arising from within the parasite community, external factors such as host characteristics may be the main determinants of parasite diversity.
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Acknowledgement
R. Poulin is supported by a James Cook Research Fellowship from the Royal Society of New Zealand. This study was supported by grant FONDECYT 1980442 to M. George-Nascimento.
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Appendix 1
Appendix 1
Summary of the data set used in the analyses
Host species | No. hosts examined | Host mass (g) | Parasite richness | Log parasite biovolume/host |
---|---|---|---|---|
Genypterus maculatus | 60 | 2,236 | 9 | 3.177 |
Genypterus chilensis | 60 | 3,538 | 10 | 2.743 |
Genypterus blacodes | 60 | 2,757 | 11 | 3.07 |
Hippoglossina macrops | 25 | 810 | 7 | 1.017 |
Paralichthys adspersus | 35 | 817 | 9 | 1.633 |
Paralichthys microps | 35 | 568 | 9 | 1.55 |
Macruronus magellanicus | 147 | 1,700 | 8 | 2.166 |
Merluccius australis | 807 | 2,057 | 13 | 2.653 |
Merluccius gayi | 578 | 890 | 13 | 2.322 |
Trachurus symmetricus | 600 | 601 | 11 | 0.544 |
Dissostichus eleginoides | 49 | 28,253 | 10 | 3.079 |
Stromateus stellatus | 35 | 595 | 5 | 1.061 |
Eleginops maclovinus | 75 | 1,136 | 12 | 1.496 |
Seriolella violacea | 26 | 778 | 6 | 3.485 |
Scomber japonicus | 77 | 1,372 | 8 | 1.009 |
Helicolenus lengerichi | 56 | 1,136 | 11 | 1.584 |
Sebastes capensis | 42 | 778 | 8 | 1.106 |
Brama australis | 26 | 1,505 | 13 | 2.691 |
Thyrsites atun | 17 | 1,161 | 8 | 1.27 |
Pinguipes chilensis | 29 | 800 | 6 | 0.994 |
Prolatilus jugularis | 35 | 400 | 9 | 1.29 |
Sicyases sanguineus | 21 | 538 | 1 | 1.688 |
Scartichthys viridis | 71 | 43 | 2 | −0.854 |
Girella laevifrons | 309 | 35 | 2 | −1.523 |
Auchenionchus microcirrhis | 22 | 46 | 2 | −2.222 |
Graus nigra | 73 | 33 | 2 | −1.222 |
Cilus gilberti | 57 | 5,447 | 15 | 2.623 |
Aplodactylus punctatus | 46 | 814 | 4 | 2.086 |
Mugil cephalus | 15 | 1,453 | 6 | 0.677 |
Gobiesox marmoratus | 55 | 6 | 4 | −1.523 |
Sindoscopus australis | 43 | 2 | 3 | −1.523 |
Calliclinus geniguttatus | 30 | 5 | 5 | −0.319 |
Myxodes cristatus | 17 | 3 | 2 | −0.538 |
Notothenia macrocephala | 38 | 33 | 9 | 0.718 |
Epigonus crassicaudus | 38 | 550 | 3 | 1.762 |
Auchenionchus variolosus | 14 | 24 | 6 | 0.588 |
Myxodes viridis | 15 | 4 | 6 | 0.602 |
Tripterygion chilensis | 17 | 4 | 2 | −0.538 |
Aphos porosus | 22 | 204 | 9 | 0.9 |
Cheilodactylus variegatus | 13 | 395 | 9 | 0.64 |
Bovichthys chilensis | 14 | 513 | 6 | 2.056 |
Patagonotothen curnicola | 58 | 10 | 10 | 1.015 |
Chamsocephalus gunnari | 39 | 769 | 8 | 1.491 |
Bufo retiformis | 49 | 12.5 | 6 | 1.583 |
Bufo cognatus | 36 | 18.5 | 4 | 1.675 |
Bufo debilis | 49 | 7 | 5 | 1.583 |
Bufo hemiophys | 40 | 23 | 4 | 1.672 |
Spea multiplicata | 31 | 26 | 4 | 0.795 |
Rana catesbiana | 16 | 26 | 2 | −0.027 |
Rana clamitans | 62 | 200 | 5 | 1.119 |
Rana palustris | 5 | 32 | 1 | −1.398 |
Plethodon cinereus | 60 | 25.5 | 4 | 0.358 |
Desmognathus brimleyorum | 41 | 28 | 7 | 0.199 |
Desmognathus fuscus | 52 | 9.5 | 3 | −0.62 |
Eurycea bislineata | 51 | 7 | 4 | 0.322 |
Rana pipiens | 43 | 10 | 9 | 1.671 |
Nerodia cyclopion | 48 | 208 | 12 | 4.126 |
Nerodia fasciata | 30 | 183 | 10 | 2.448 |
Nerodia rhombifera | 11 | 322 | 7 | 2.581 |
Agkistrodon piscivorus | 10 | 199 | 10 | 3.167 |
Anolis aeneus | 20 | 4 | 3 | 0.207 |
Anolis extremus | 10 | 9 | 3 | −0.523 |
Anolis gingivinus | 78 | 3 | 9 | 0.947 |
Anolis griseus | 10 | 13 | 3 | 0.258 |
Anolis luciae | 34 | 5 | 3 | 1.176 |
Anolis marmoratus | 25 | 4.5 | 3 | −0.31 |
Anolis oculatus | 20 | 6 | 8 | 0.863 |
Anolis richardi | 20 | 13 | 4 | 0.452 |
Anolis trinitalis | 17 | 3 | 1 | −1.699 |
Anolis wattsi | 20 | 2.5 | 4 | −.222 |
Anolis carolinensis | 30 | 7.5 | 2 | 0.322 |
Cnemidophorus dixoni | 58 | 11.3 | 6 | 1.813 |
Cnemidophorus exanguis | 37 | 13.5 | 3 | 1.525 |
Cnemidophorus gularis | 118 | 10.5 | 6 | 1.234 |
Cnemidophorus neomexi | 44 | 7.5 | 4 | 0.207 |
Cnemidophorus tesselatus | 27 | 16.5 | 4 | 1.222 |
Sceloporus magister | 17 | 534 | 6 | 0.79 |
Sceloporus meriami | 39 | 79.5 | 3 | −0.26 |
Sceloporus marriami | 23 | 79.5 | 6 | 1.101 |
Sceloporus olivaceus | 61 | 392.5 | 5 | 2.336 |
Sceloporus poinsettii | 13 | 276 | 5 | 3.043 |
Sceloporus serrifer | 25 | 438 | 4 | 1.916 |
Sceloporus undulatus | 10 | 75.5 | 1 | 1.622 |
Urosouys ornatus | 86 | 6.5 | 4 | 1.622 |
Alligator mississippiensis | 50 | 750,000 | 11 | 2.435 |
Cnemidophorus burtistic | 57 | 10.5 | 5 | 0.386 |
Barisia imbricata | 14 | 9.5 | 4 | 1.498 |
Coerrhonotus ophiurus | 54 | 16.5 | 3 | 1.37 |
Liolaemus lemniscatus | 13 | 4 | 1 | 0.442 |
Liolaemus tenuis | 7 | 5 | 1 | 1.15 |
Caretta caretta | 54 | 10,700 | 5 | 2.506 |
Spermophylus townsendii | 117 | 570 | 4 | 2.656 |
Eptesiicus fuscus | 464 | 25 | 22 | 1.697 |
Lasionycteris noctivagans | 6 | 15 | 5 | 1.917 |
Lasiurus borealis | 90 | 13 | 5 | 1.979 |
Lasiurus cinereus | 18 | 26 | 1 | −0.143 |
Myotis keenii | 30 | 6 | 8 | 1.742 |
Myotis lucifurgus | 191 | 12 | 21 | 1.453 |
Myotis sodalis | 17 | 11 | 9 | 2.447 |
Pipistrellus subflavus | 71 | 5 | 8 | −0.066 |
Hydrochaeris hydrochaeris | 41 | 32,000 | 7 | 4.324 |
Clethrionomys glarealus | 193 | 40 | 8 | 2.63 |
Oryzomys palustris | 178 | 54 | 17 | 3.883 |
Rattus rattus | 612 | 485 | 7 | 3.293 |
Canis latrans | 177 | 23,000 | 20 | 2.029 |
Tadarida brasiliensis | 45 | 13 | 10 | 1.384 |
Phocoena phocoena | 80 | 60,000 | 7 | 3.589 |
Didelphis virginiana | 46 | 4,020 | 12 | 3.396 |
Mustela vison | 50 | 2,325 | 5 | 3.939 |
Ondatra zibethicus | 50 | 1,370 | 3 | 2.291 |
Otaria flavescens | 46 | 300,000 | 6 | 6.302 |
Aechmophorus occidentalis | 20 | 1,262 | 16 | 4.105 |
Podiceps grisegena | 33 | 1,124 | 20 | 4.609 |
Podiceps nigricollis | 31 | 366 | 27 | 5.553 |
Podiceps auritus | 7 | 393 | 14 | 3.583 |
Dendrocygna bicolor | 30 | 688 | 15 | 2.938 |
Corus frugilegus | 327 | 370 | 20 | .886 |
Egretta caerulea | 35 | 340 | 21 | 2.802 |
Ajaia ajaja | 128 | 1,814 | 24 | 2.957 |
Edocinus albus | 140 | 1,400 | 35 | 2.758 |
Accipiter striatus | 8 | 323 | 5 | 0.88 |
Buteo lagopus | 21 | 1,150 | 4 | 0.882 |
Buteo jamaicensis | 11 | 995 | 5 | 1.306 |
Buteo platypterus | 16 | 390 | 11 | 0.286 |
Falco sparverius | 9 | 350 | 3 | 0.779 |
Puffinus gravis | 15 | 4,080 | 8 | 2.601 |
Pandion haliaetus | 5 | 1,600 | 14 | 3.625 |
Ixoreus naevius | 46 | 110 | 21 | 1.808 |
Turdus migratorius | 17 | 110 | 10 | 2.457 |
Phalacrocorax auritus | 12 | 2,041 | 14 | 3.548 |
Phalacrocorax brasilianus | 12 | 2,495 | 14 | 3.632 |
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Poulin, R., Mouillot, D. & George-Nascimento, M. The relationship between species richness and productivity in metazoan parasite communities. Oecologia 137, 277–285 (2003). https://doi.org/10.1007/s00442-003-1343-z
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DOI: https://doi.org/10.1007/s00442-003-1343-z