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We tested for differential habitat use by Pacific sheath-tailed bats (Emballonura semicaudata) in three major vegetation types on Aguiguan, Mariana Islands. Acoustic surveys of bat activity were conducted on a 370-m grid with 50 stations that covered the entire island. We controlled for a variety of extraneous factors through sampling design and use of a generalized linear model. Bat activity was significantly higher in native and nonnative forests than in non-forest habitats. There was no significant difference between activity levels in the two forest types. However, our sample size in non-native forest was limited to seven stations, thus the conclusion that non-native forest is an important habitat for the species should be viewed with caution. Our finding that E. semicaudata may be reliant on forest is critical because forests on Aguiguan are threatened by feral goats
Pacific sheath-tailed bats (Emballonura semicaudata rotensis) in the Mariana Islands declined greatly in abundance and distribution during the 20th century. The small island of Aguiguan now supports the only persisting population. We studied abundance and natural history of this population from 1995-2008. There was a likely population increase during the study, with 359-466 (minimum and maximum) bats counted at caves in 2008. Bats roosted only in caves, primarily those of relatively larger size. Bats were detected in only seven of 95 caves; three caves were always occupied when surveyed. One cave consistently had the largest colony (x̅ ± SD = 333 ± 33.6 in 2008). Others held 1-64 bats. Cave environments showed no complexities in temperature or humidity. Preliminary observations indicate a litter size of one and the possibility of birthing timed to coincide with the transitional period leading into the rainy season (June-July). We review potential threats to E. s. rotensis on Aguiguan and make suggestions for conservation.
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