Emballonura semicaudata occurs in the southwestern Pacific and populations on many islands have declined or disappeared. One subspecies (E. semicaudata rotensis) occurs in the Northern Mariana Islands, where it has been extirpated from all but 1 island (Aguiguan). We assessed genetic similarity between the last population of E. s. rotensis and 2 other subspecies, and examined genetic diversity on Aguiguan. We sampled 12 E. s. rotensis, sequenced them at 3 mitochondrial loci, and compared them with published sequences from 2 other subspecies. All 12 E. s. rotensis had identical sequences in each of the 3 regions. Using cytochrome-b (Cytb) data E. s. rotensis was sister to E. s. palauensis in a clade separate from E. s. semicaudata. 12S ribosomal RNA (12S) sequences grouped all E. s. semicaudata in 1 clade with E. s. rotensis in a clade by itself. Genetic distances among the 3 subspecies at Cytb were smallest between E. s. palauensis and E. s. rotensis. Distance between E. s. semicaudata and the other 2 subspecies was not different from the distance between E. s. semicaudata and the full species E. raffrayana. A similar relationship was found using the 12S data. These distances are larger than those typically reported for mammalian subspecies using Cytb sequence and within the range of sister species.
Abstract: The Pacific sheath-tailed bat (Emb(lllonura .,emicalldata rotC11sis) and Nlariana swiftlet (AeTodramus hartscbt) are two rarc insectivorous taxa restrined to the southern Mariana Islands in western Micronesia. It is believed that populations of both have dwindled because of impacts (() their food resources. However, there is little information on the food habits ofA. battsc!?i and none exists for E. s. rotemis. Tn an effort to better understand the feeding habits of both, we investigated their diets using guano analysis. Guano "vas collected from two roosts in caves during a 2-week period in June and July at the onset of the rainy scason. Important orders of insects consumed (perecn (age volume) by bats roosting" at one cave included hymenopterans (64%), coleopterans (10%), lepidopterans (8%), isopterans (R%), and psocopterans (5 %), whereas those at a second cave included Jepidopterans (45%), hymenopterans (41 %), coleopterans (10%), and isopterans (5 'Yo)...
Modelling detectability of kiore (Rattus exulans) on Aguiguan, Mariana Islands, to inform possible eradication and monitoring efforts
Yackel Adams, A.A., J.W. Stanford, A.S. Wiewel, and G.H. Rodda
Estimating the detection probability of introduced organisms during the pre-monitoring phase of an eradication effort can be extremely helpful in informing eradication and post-eradication monitoring efforts, but this step is rarely taken. We used data collected during 11 nights of mark-recapture sampling on Aguiguan, Mariana Islands, to estimate introduced kiore (Rattus exulans Peale) density and detection probability, and evaluated factors affecting detectability to help inform possible eradication efforts. Modelling of 62 captures of 48 individuals resulted in a model-averaged density estimate of 55 kiore/ha...
The land reptiles of Aguiguan (Aguijan) Island, a report to the U.S. Fish and Wildlife Service