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Responses of Soil Invertebrate and Bacterial Communities to the Removal of Nonnative Feral Pigs from a Hawaiian Tropical Montane Wet Forest

File Description Size Format  
Wehr - Unofficial Final Thesis - Feral Pigs and Soil Fauna.pdf Final Thesis 1.61 MB Adobe PDF View/Open
Functional Groups - Soil Chronosequence - PICRUSt.xlsx Functional Group Appendix 35 kB Microsoft Excel XML View/Open
Opperational Taxanomic Units - Soil Chronosequence - 16S rRNA.xlsx OTU Appendix 514.6 kB Microsoft Excel XML View/Open
Feral Pig Damage - Hawaii - Photo.jpg Feral Pig Damage Photo 472.1 kB JPEG View/Open
Parasitidae #2 Lateral.jpg Parasitidae Image 1.76 MB JPEG View/Open
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Talitridae #2 Dorsal.jpg Talitridae Image 1.7 MB JPEG View/Open
Talitridae #1 Lateral.jpg Talitridae Image 1.71 MB JPEG View/Open
Read Me - Macroinvertebrate Photos.docx Macroinvertebrate Photo Guide 11.96 kB Microsoft Word XML View/Open
Carabidae Dorsal.jpg Carabidae Image 1.6 MB JPEG View/Open
Geophilidae #1 Dorsal.jpg Geophilidae Image 1.52 MB JPEG View/Open
Geophilidae #2 Lateral.jpg Geophilidae Image 1.61 MB JPEG View/Open
Hemiptera #1 Ventral.jpg Hemiptera Image 1.66 MB JPEG View/Open
Lepidoptera #1 Dorsal.jpg Lepidoptera Image 1.64 MB JPEG View/Open
Lepidoptera #2 Lateral.jpg Lepidoptera Image 1.37 MB JPEG View/Open
Julidae #2 Dorsal.jpg Julidae Image 1.77 MB JPEG View/Open
Julidae #1 Lateral.jpg Julidae Image 1.58 MB JPEG View/Open
Lumbricidae #1 Saddle.jpg Lumbricidae Image 1.89 MB JPEG View/Open
Lumbricidae #2 Lateral.jpg Lumbricidae Image 1.93 MB JPEG View/Open
Hemiptera #3 Dorsal.jpg Hemiptera Image 2.06 MB JPEG View/Open
Hemiptera #2 Dorsal.jpg Hemiptera Image 1.64 MB JPEG View/Open
Oxychilidae Dorso-Lateral.jpg Oxychilidae Image 2.76 MB JPEG View/Open
Oniscidea Lateral.jpg Oniscidea Image 1.51 MB JPEG View/Open
Megascolicidae #2 Saddle.jpg Megascolicidae Image 2.08 MB JPEG View/Open
Megascolicidae #1 Collar.jpg Megascolicidae Image 1.92 MB JPEG View/Open
Parasitidae #1 Dorsal.jpg Parasitidae Image 1.84 MB JPEG View/Open
Macroinvertebrate Raw Data.xlsx 96.72 kB Microsoft Excel XML View/Open
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Item Summary

Title:Responses of Soil Invertebrate and Bacterial Communities to the Removal of Nonnative Feral Pigs from a Hawaiian Tropical Montane Wet Forest
Authors:Wehr, Nathaniel H.
Keywords:chronosequence, bacteria, earthworm, ecosystem engineer, eDNA, ground beetle, Illumina, invasive, management, next generation sequencing, ungulate
Date Issued:2018
Abstract:Feral pigs (Sus scrofa) are perhaps the most abundant, widespread, and economically significant large, introduced vertebrate across the Pacific Island region. This species has played a role in the degradation of native ecosystems and the extinction of multiple species of plants and animals on Pacific islands and has negative effects on both the ecotourism and agricultural industries. Despite numerous published studies on feral pigs in the Pacific Island region, some fundamental aspects of feral pig ecology remain poorly characterized, particularly belowground. To address these knowledge gaps, this thesis analyzed relationships between soil macroinvertebrates and microbes and feral pigs using nine sites located inside and outside of feral pig removal units representing a ~25-year environmentally-constrained chronosequence of removal in tropical montane wet forests in Hawai‘i. The results of these studies indicate that areas with active trampling by feral pigs correlate with lower abundance, biomass, and species richness of all soil macroinvertebrates. Comparatively, active rooting correlated with higher abundance and biomass of nonnative earthworms (Lumbricidae and Megascolicidae) and ground beetles (Carabidae). Further, my results indicate an overall increase in the net biodiversity of soil bacterial communities following feral pig removal, with biodiversity positively correlating to time since removal. Comparatively, environmental characteristics, including mean annual temperature and elevation, are better predictors of differences in functional and phylogenetic biodiversity among soil bacterial communities than feral pig removal. Collectively, these results indicate that the removal of feral pigs largely does not affect soil macroinvertebrates but does increase the diversity of bacterial communities, which could increase ecosystem stability.
Rights:This work was, in part, created by U.S. government employees and are in the public domain. Public domain information may be freely distributed and copied, but it is requested that any subsequent use be given appropriate acknowledgement. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. government.
CC0 1.0 Universal
Appears in Collections: CTAHR Student Works

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