Data from: Seasonal phenology of the little brown bat (Myotis lucifugus) at 60°N

# **Data from: Seasonal phenology of the little brown bat (*Myotis lucifugus*) at 60°N** Two simple comma separated (csv) files associated with the manuscript "Seasonal phenology of the little brown bat (*Myotis lucifugus*) at 60°N" by Jesika P. Reimer and Robert M. R. Barclay, accepted by Ecosphere. ## **Description of the data and file structure** **Dataset 1: NWTMyotisCaptureRecords.xls** Morphometric measurements and reproductive status for *Myotis lucifugus* and *Myotis septentrionalis* captured during summer surveys at maternity colonies, hibernacula, and foraging sites in the Northwest Territories, Canada during summer 2011 and 2012. These data were used to calculate maternity colony reproductive rates, the timing of parturition and juvenile fledging, and to assess changes in *Myotis lucifugus* mass throughout the season. Empty cells and NA: cells were left empty when data were not available/not recorded. Variables: Night_date: the date the survey was started and includes captures after midnight on the next calendar date (e.g. captures at 23:55 on 2 June and 01:00 on 3 June both have a night_date value of 2 June). Latitude: Latitude of capture survey location, truncated to 1-2 decimal places to preserve privacy of restricted locations. Longitude: Longitude of capture survey location, truncated to 1-2 decimal places to preserve privacy of restricted locations. Region: A one-word descriptor that groups survey sites into broader-scale regions. Site: A site-specific text descriptor that identifies each unique survey site. BandID: The unique ID code printed on the Porzana arm band affixed to the bat. Can be used as a unique identifier for individual bats. Species: Standardized species name (genus species) Sex: Sex of individual; ‘Female’ or ‘Male’ Ageclass: General age of individual group into ‘Adult’ – fused epiphesial joints, ‘Juvenile’ – young of the year identified by un-fused epiphesial joints, ‘UNK’ – unknown age class. Massg: Mass of individual measured in grams. Massinacuracy: Asterix indicates that the bat was captured post-foraging and was not held a sufficient amount of time to ensure an accurate weight. Do not use these data points for mass-related analysis. Forearmlengthmm: Individual forearm length measured in millimetres. Earlengthmm: Individual ear length measured in millimetres. Reproductivestatus: Individual reproductive status; ‘JUV’ – juvenile, ‘LAC’ – lactating, ‘NOP’ – not obviously pregnant (may indicate non-reproductive female, or a female captured early in the season before pregnancy is detectable with manual palpation), ‘POST’ – post-lactating, ‘PREG’ – pregnant. Comments: Comments regarding individual noted during capture. Capturetime: The time at which the bat was removed from the capture net. Releasetime: The time at which the bat was released after processing. **Dataset 2: NWTMyotisAcousticRecords.xls** Nightly summary of acoustic recordings for *Myotis* species during acoustic surveys at maternity colonies, hibernacula and foraging sites in the Northwest Territories, Canada during summer 2011 and 2012. These data were used to describe seasonal activity of *Myotis* in the area. Empty cells: cells were left empty when the acoustic detector was not active. Variables: Site: A site-specific text descriptor that identifies each unique survey site. Latitude: Latitude of capture survey location, truncated to 1-2 decimal places to preserve privacy of restricted locations. Longitude: Longitude of capture survey location, truncated to 1-2 decimal places to preserve privacy of restricted locations. Night_date: the date the survey was started and includes captures after midnight on the next calendar date (e.g. captures at 23:55 on 2 June and 01:00 on 3 June both have a night_date value of 2 June). Myotis: Total acoustic files identified as a *Myotis* species recorded on a given night; this classification is used at hibernacula and foraging sites where both *M. lucifugus* and *M. septentrionalis* have been observed. Detector Active: Indicator of whether a detector was functioning correctly during the survey period (derived from the detector log files); ‘Yes’ – detector was functioning, ‘No’ – detector was not functioning (e.g. dead batteries). Site type: Classification of site type; ‘Foraging site’, ‘Hibernaculum’, ‘Maternity colony’