Wyniki wyszukiwania

1

Evaluation of morphological indices and total body electrical conductivity to assess body composition in big brown bats

100%

Pearce R. D., O'Shea T. J., Wunder B. A.

Acta Chiropterologica

|

2008

|

tom 10

|

nr 1

Bat researchers have used both morphological indices and total body electric conductivity (TOBEC) as proxies for body condition in a variety of studies, but have typically not validated these indices against direct measurement of body composition. We quantified body composition (total carcass lipids) to determine if morphological indices were useful predictors of body condition in big brown bats (Eptesicus fuscus). We also evaluated body composition indirectly by TOBEC using EM-SCAN® technology. The most important predictors of body composition in multiple regression analysis were body mass-to-forearm ratio (partial r2 = 0.82, P < 0.001) followed by TOBEC measurement (partial r2 = 0.08, P < 0.001) and to a minor extent head length (partial r2 = 0.02, P < 0.05). Morphological condition indices alone may be adequate for some studies because of lower cost and effort. Marking bats with passive integrated transponder (PIT) tags affected TOBEC measurements.

2

Status and natural history of Emballonura semicaudata rotensis on Aguiguan, Mariana Islands

88%

Wiles G. J., O'Shea T. J., Worthington D. J., Esselstyn J. A., Valdez E. W.

Acta Chiropterologica

|

2011

|

tom 13

|

nr 2

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.

3

Manaty

44%

O'Shea T. J.

Świat Nauki

|

1994

|

nr 09

46-53

Ograniczanie wyników

2 Acta Chiropterologica

1 Świat Nauki

3 O'Shea T. J.

1 Esselstyn J. A.

1 Pearce R. D.

1 Valdez E. W.

1 Wiles G. J.

1 Worthington D. J.

1 Wunder B. A.

1 2011

1 2008

1 1994

Evaluation of morphological indices and total body electrical conductivity to assess body composition in big brown bats

Status and natural history of Emballonura semicaudata rotensis on Aguiguan, Mariana Islands

Manaty