title: Home range use and movement patterns of non-native feral goats in a tropical island montane dry landscape.
abstract: Advances in wildlife telemetry and remote sensing technology facilitate studies of broad-scale movements of ungulates in relation to phenological shifts in vegetation. In tropical island dry landscapes, home range use and movements of non-native feral goats (Capra hircus) are largely unknown, yet this information is important to help guide the conservation and restoration of some of the world's most critically endangered ecosystems. We hypothesized that feral goats would respond to resource pulses in vegetation by traveling to areas of recent green-up. To address this hypothesis, we fitted six male and seven female feral goats with Global Positioning System (GPS) collars equipped with an Argos satellite upload link to examine goat movements in relation to the plant phenology using the Normalized Difference Vegetation Index (NDVI). Movement patterns of 50% of males and 40% of females suggested conditional movement between non-overlapping home ranges throughout the year. A shift in NDVI values corresponded with movement between primary and secondary ranges of goats that exhibited long-distance movement, suggesting that vegetation phenology as captured by NDVI is a good indicator of the habitat and movement patterns of feral goats in tropical island dry landscapes. In the context of conservation and restoration of tropical island landscapes, the results of our study identify how non-native feral goats use resources across a broad landscape to sustain their populations and facilitate invasion of native plant communities.
authors: Department of Natural Resources and Environmental Management, University of Hawai'i at Mānoa, Honolulu, Hawai'i, United States of America.
authors: Mark W
authors: MW
authors: Chynoweth
authors: Department of Natural Resources and Environmental Management, University of Hawai'i at Mānoa, Honolulu, Hawai'i, United States of America.
authors: Christopher A
authors: CA
authors: Lepczyk
authors: Department of Natural Resources and Environmental Management, University of Hawai'i at Mānoa, Honolulu, Hawai'i, United States of America.
authors: Creighton M
authors: CM
authors: Litton
authors: U.S. Geological Survey Pacific Island Ecosystems Research Center, Hawai'i National Park, Hawai'i, United States of America.
authors: Steven C
authors: SC
authors: Hess
authors: Department of Ecology and Evolutionary Biology, Brown University, Providence, Rhode Island, United States of America.
authors: James R
authors: JR
authors: Kellner
authors: U.S. Department of Agriculture Forest Service, Institute of Pacific Islands Forestry, Hilo, Hawai'i, United States of America.
authors: Susan
authors: S
authors: Cordell
mesh_terms: D063147:Animal Distribution; D000818:Animals; D017753:Ecosystem; D005260:Female; D006041:Goats; D006254:Hawaii; D062312:Islands; D008297:Male; D009068:Movement; D058998:Remote Sensing Technology