Data from: Contrasting ecological roles of non-native ungulates in a novel ecosystem
Data files
Oct 10, 2017 version files 451.59 KB
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guam veg_for dryad.xlsx
207.60 KB
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raw poop sprouts.csv
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seedling plots_gu.csv
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tidy_veg_gu.csv
230.08 KB
Oct 30, 2017 version files 44.23 KB
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pooportions.csv
3.54 KB
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scat germ vs forest.R
2.64 KB
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seedling plots_supp.R
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seedling plots.R
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seedlingplots_guam.csv
6.66 KB
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vegandscat_analysis_plot_SuppFig.R
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vegandscat.R
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vegandsign.csv
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Abstract
Conservation has long focused on preserving or restoring pristine ecosystems. However, understanding and managing novel ecosystems has grown in importance as they outnumber pristine ecosystems worldwide. While non-native species may be neutral or detrimental in pristine ecosystems, it is possible that even notorious invaders could play beneficial or mixed roles in novel ecosystems. We examined the effects of two long-established non-native species – Philippine deer (Rusa marianna) and feral pigs (Sus scrofa) – in Guam, Micronesia, where native vertebrate frugivores are functionally absent leaving forests devoid of seed dispersers. We compared the roles of deer and pigs on seedling survival, seed dispersal, and plant community structure in limestone karst forests. Deer, even at low abundances, had pronounced negative impacts on forest communities by decreasing seedling and vine abundance. In contrast, pigs showed no such relationship, and more seeds were found in pig scats than deer scats, suggesting that pigs provide an ecosystem function – seed dispersal – that has been lost from Guam. Our study presents a surprising discrepancy between the roles of two non-native species that are traditionally managed as a single entity, suggesting that ecological function, rather than identity as a non-native, may be more important to consider in managing novel systems.