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Hawaiian hoary bats ('ōpe'ape'a; Lasiurus semotus) were surveyed at 23 sites on Hawaiʻi Island from 33 to 2,341 m elevation from May 2018 to August 2021. Of the 23 sites, 8 were established as fixed survey sites for sampling at repeated intervals from January 2019 through January 2021. We surveyed each fixed site at least once per four month period (January–April, May–August, September–December), with a survey comprising one to three netting events. Additional opportunistic surveys were conducted at alternate locations or on alternate dates. We captured 138 unique bats (37 female, 101 male) and recaptured 10 bats over 224 mist-netting events. This data file includes data pertaining to mist netting effort locations,...
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‘Ōpe‘ape‘a (Hawaiian hoary bats; Lasiurus semotus) were surveyed at 23 sites on Hawaiʻi Island from 33 to 2,341 m elevation from May 2018 to August 2021. Bats were captured using mist nets; once detangled from mist nets, bats were secured in cloth holding bags for up to 10 min before collecting age, sex, reproductive condition, mass, forearm length, and biological samples and marking individuals with split ring bands and attaching very high frequency (VHF) radio transmitters. We captured 138 uniquely identified individuals (37 female, 101 male), of which 10 were recaptured (4 female, 6 male) and an additional 10 were ensnared in nets and escaped, for a total of 158. This data file includes data related to individual...
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Three albatross species breed at Midway Atoll: black-footed (Phoebastria nigripes), Laysan (P. immutabilis), and short-tailed (P. albatrus). This dataset contains the boundaries of survey area sectors used during the USFWS albatross censuses at Midway Atoll National Wildlife Refuge. The entire area of the atoll is divided into 61 unequal-area sectors. Sector boundaries were established by the USFWS. USGS digitzed the sector boundaries using satellite imagery and data points collected during the 2011-2012 albatross breeding season (hatch year 2012).
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Approximately one-third of the global population of black-footed albatrosses (Phoebastria nigripes) nest at Midway Atoll in the Northwestern Hawaiian Islands. As part of an effort to monitor albatross at this globally important site, USFWS personnel and volunteers conduct an annual, spatially-explicit, atoll-wide albatross census during the peak nesting when albatrosses are attending an egg (December-January). During the 2011-2012 breeding season (hatch year 2012) the census was conducted December 16, 2011–January 8, 2012. Albatross nest counts during the census were divided into 61 historically established, spatially-explicit sectors of unequal area. Within a sector, surveyors walked parallel transects approximately...
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Approximately one-third of the global population of black-footed albatrosses (Phoebastria nigripes) nest at Midway Atoll in the Northwestern Hawaiian Islands. As part of an effort to monitor albatross at this globally important site, USFWS personnel and volunteers conduct an annual, spatially-explicit, atoll-wide albatross census during peak nesting when albatrosses are attending an egg (December-January). During the 2011-2012 breeding season (hatch year 2012) the census was conducted December 16, 2011–January 8, 2012. Albatross nest counts during the census were divided into 61 historically established, spatially-explicit sectors of unequal area. Within a sector, surveyors walked parallel transects approximately...
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Hawaiian hoary bats ('ōpe'ape'a; Lasiurus semotus) were captured at 23 sites on Hawaiʻi Island from May 2018 through August 2021. Radio transmitters were affixed to captured bats and, when possible, radio telemetry was used to locate bats in trees or forest stands used for day-roosts. Repeated visits to confirm bat presence were conducted until radio-tagged bats were no longer detected. Of the total 148 captured bats we affixed 131 with radio transmitters and attempted to relocate 127 (38 female; 89 male; 120 adult; 7 juvenile) on subsequent days of tracking. Radio signals were not detected for 36 bats (6 female; 30 male). Of the 91 bats (32 female; 59 male) relocated, males retained transmitters longer than females...


    map background search result map search result map Hawai‘i Island ʻōpeʻapeʻa captures, 2018–2021 Hawaiʻi Island ʻōpeʻapeʻa mist netting effort, 2018–2021 Hawaiʻi Island ʻōpeʻapeʻa transmitter retention, 2018-2021 Hawai‘i Island ʻōpeʻapeʻa captures, 2018–2021 Hawaiʻi Island ʻōpeʻapeʻa mist netting effort, 2018–2021 Hawaiʻi Island ʻōpeʻapeʻa transmitter retention, 2018-2021