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Coprolites Reveal Ecological Interactions Lost with the Extinction

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Coprolites Reveal Ecological Interactions Lost with the Extinction Coprolites reveal ecological interactions lost with the FROM THE COVER extinction of New Zealand birds Alexander P. Boasta,b,c,1, Laura S. Weyricha, Jamie R. Woodc, Jessica L. Metcalfd, Rob Knighte,f,g, and Alan Coopera,1 aAustralian Centre for Ancient DNA, University of Adelaide, Adelaide, SA 5005, Australia; bSchool of Environment, The University of Auckland, Auckland 1142, New Zealand; cLandcare Research, Lincoln 7608, New Zealand; dDepartment of Animal Sciences, Colorado State University, Fort Collins, CO 80526; eDepartment of Pediatrics, University of California, San Diego, La Jolla, CA 92093; fDepartment of Computer Science and Engineering, University of California, San Diego, La Jolla, CA 92093; and gCenter for Microbiome Innovation, University of California, San Diego, La Jolla, CA 92093 Edited by James A. Estes, University of California, Santa Cruz, CA, and approved December 27, 2017 (received for review August 4, 2017) Over the past 50,000 y, biotic extinctions and declines have left a barcoding loci, such as the 16S (bacterial) or 18S (eukaryote) legacy of vacant niches and broken ecological interactions across ribosomal RNA (rRNA) genes, multiple taxonomic groups can global terrestrial ecosystems. Reconstructing the natural, unmod- be identified at depths of tens of thousands of sequences from ified ecosystems that preceded these events relies on high- many individual samples simultaneously (17). Despite these clear resolution analyses of paleoecological deposits. Coprolites are a advantages, however, thus far aDNA metabarcoding of copro- source of uniquely detailed information about trophic interactions lites has been used only to characterize ancient human gut and the behaviors, gut parasite communities, and microbiotas of bacteria (18, 19), dietary archaeological data from Polynesian prehistoric animal species. Such insights are critical for understanding domestic dogs (20), and seed plants consumed by Pleistocene the legacy effects of extinctions on ecosystems, and can help guide Arctic megafauna (21). Metabarcoding has been underutilized on coprolites to resolve the paleoecology of extinct species. contemporary conservation and ecosystem restoration efforts. Here Here we used HTS metabarcoding approaches on coprolites we use high-throughput sequencing (HTS) of ancient eukaryotic DNA to explore lost species interactions in the large (268,021 km2) from coprolites to reconstruct aspects of the biology and ecology of South Pacific archipelago of New Zealand (NZ). NZ is an ex- four species of extinct moa and the critically endangered kakapo cellent locality for aDNA studies, as it was the last large land- parrot from New Zealand (NZ). Importantly, we provide evidence mass to be colonized by humans (during the 13th century A.D.) ECOLOGY that moa and prehistoric kakapo consumed ectomycorrhizal fungi, (22), and the ecological record of its unique, prehuman ecosys- suggesting these birds played a role in dispersing fungi that are tems are exceptional (23). Due to NZ’s large size and long iso- key to NZ’s natural forest ecosystems. We also provide the first lation (ca. 55 Ma) from the supercontinent Gondwana (24), NZ’s DNA-based evidence that moa frequently supplemented their indigenous biota has older lineages, and greater phylogenetic broad diets with ferns and mosses. Finally, we also find parasite diversity and ecological complexity, than most oceanic islands taxa that provide insight into moa behavior, and present data (25). NZ’s recent indigenous fauna lacks terrestrial mammals supporting the hypothesis of coextinction between moa and sev- (except bats) and was dominated by birds - the largest of which eral parasite species. Our study demonstrates that HTS sequenc- were nine species of extinct herbivorous moa (Dinornithiformes) ing of coprolites provides a powerful tool for resolving key aspects (up to 250 kg in body mass and 3.6 m tall) (23, 26). NZ’s ter- of ancient ecosystems and may rapidly provide information not restrial ecosystems experienced dramatic and rapid changes obtainable by conventional paleoecological techniques, such as following human settlement, including the loss of 41% of in- fossil analyses. digenous bird species (including all moa species within 200 y of human arrival) (23, 26–28); however, NZ’s temperate climate, ancient DNA | metabarcoding | coprolites | moa | New Zealand widespread cave systems, and recent extinction ages have resul- ted in exceptional preservation of prehuman faunal remains. In- cluded in these are thousands of avian coprolites, up to >7,000 y he late Quaternary (last 50,000 y) has seen global declines Tand extinctions of terrestrial biota on an unprecedented Significance scale, characterized by the widespread extinction of charismatic megafauna, such as the woolly mammoth (Mammuthus pri- migenius) (1). Advances in ecological network theory have high- Ancient DNA metabarcoding of coprolites (ancient dung) has lighted the extent to which the effects of extinction can reverberate greatly improved our ability to investigate the behavior and ecology of extinct species. We use coprolites from extinct New throughout an ecosystem due to loss of interactions (e.g., propa- Zealand birds to show how this approach can reveal aspects of gule dispersal, pollination, parasitism) and processes (e.g., nutrient dietary behavior, such as the consumption of ectomycorrhizal cycling) (2–5). Thus, assessing the real-world effects of late Qua- fungi, and both the distribution and coextinction of parasites. ternary extinctions and declines on terrestrial ecosystems re- We show how this approach can identify lost ecological inter- quires detailed information about the ecological interactions actions, which have key implications for understanding, con- and ecosystem processes that were provided by the lost species. serving, and restoring currently threatened ecosystems. While such details are seldom preserved in the fossil record, coprolites (ancient dung) provide a key resource for obtaining Author contributions: A.P.B., L.S.W., J.R.W., J.L.M., R.K., and A.C. designed research; these data (6–16). A.P.B., L.S.W., J.R.W., and J.L.M. performed research; A.P.B., L.S.W., J.R.W., and J.L.M. Most of the work performed on late Quaternary coprolites to analyzed data; and A.P.B., L.S.W., J.R.W., J.L.M., R.K., and A.C. wrote the paper. date has focused on microscopic analyses and morphological The authors declare no conflict of interest. identification of visible remains. While such analyses are valu- This article is a PNAS Direct Submission. able, they lack the ability to confirm the identity of the depositing Published under the PNAS license. species or to resolve well-digested remains. Ancient DNA Data deposition: Raw data and supporting metadata from this study are available on (aDNA) techniques offer a tool for addressing these issues. both Qiita, https://qiita.ucsd.edu (study ID 11507) and EBI, https://www.ebi.ac.uk (acces- While several studies have sequenced aDNA from coprolites, the sion no. ERP106282). majority have used cloning and Sanger sequencing methods to 1To whom correspondence may be addressed. Email: [email protected] or alan. assess the diversity of dietary or parasitic taxa (6–14). [email protected]. High-throughput sequencing (HTS) offers clear advantages This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10. over these methods. By indexing and pooling amplicons of key 1073/pnas.1712337115/-/DCSupplemental. www.pnas.org/cgi/doi/10.1073/pnas.1712337115 PNAS Latest Articles | 1of6 Downloaded by guest on September 30, 2021 old (14), of which nearly 100 have been assigned (using aDNA) to different moa taxa clearly demonstrate interspecific niche par- five moa species (7–11, 13) and the critically endangered kakapo titioning, allowing several large herbivores to exploit a broad parrot (Strigops habroptilus) (12). The plant and parasite contents range of habitats and food sources (7, 9–11, 13, 23, 34–36). Based of these coprolites have been identified using microfossil and on this evidence, the current research supports the idea that little Sanger sequencing methods (7–13, 15, 16), but these approaches bush moa browsed nearly exclusively on fibrous, forest vegeta- are labor-intensive and have not addressed the full diversity of tion, whereas heavy-footed moa browsed and grazed on vegeta- potential lost ecological interactions. For example, fossil analyses tion characteristic of open habitats. Upland moa and giant moa are unable to elucidate the full diversity of gastrointestinal para- appear to have been widespread dietary generalists, with upland sites or microbes, or foods in the diet that are unlikely to be moa populating higher altitudes. Due to the differing ecological preserved, such as nonfibrous plant tissues or fungi. Thus, there is and geographic ranges of different moa species, most coprolite little information on foods that were regularly exploited by moa, localities contain coprolites of single moa species, but one site other than flowering or coniferous plants. It has also been hy- near a forest margin (Dart River Valley) contains coprolites pothesized that the many NZ fungi with bright-colored fruiting from all four moa species, allowing for examination of niche bodies are adapted for dispersal by native ground-dwelling birds partitioning (Fig. 1 and SI Appendix, Tables S1 and S2). (29, 30), but this hypothesis has not been tested, as most of the relevant birds are now extinct. Results In this study, we examined whether an HTS
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