YEAR-ROUND BRIDGE COLONY OF MEXICAN FREE-TAILED BATS (TADARIDA BRASILIENSIS MEXICANA) IN TRANS-PECOS TEXAS

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
Stephen Kasper ◽  
Franklin D. Yancey
Keyword(s):  
Late Summer ◽  
Adult Males ◽  
Tadarida Brasiliensis ◽  
Local Resources ◽  
Big Bend ◽  
In Trans ◽  
Novel Behavior ◽  
Maternity Roost ◽  
Tadarida Brasiliensis Mexicana

Abstract Mexican Free-tailed Bats (Tadarida brasiliensis mexicana) from a bridge colony in Big Bend Ranch State Park, Presidio County, Texas were followed over two natal seasons sand two winters. For the period of this study, the bridge was being utilized as a maternity roost with a number of the young of the summer overwintering in each of the two winters examined. The site also was used by nonreproductive adult males during spring and summer. Adult bats left the bridge roost by mid-to-late summer, leaving only young of the summer at the bridge to exploit roost and local resources through the fall and winter. Young of the summer being left at the maternity roost to overwinter is a novel behavior for T. b. mexicana. Sex-and age-specific segregation of bats is inferred within the bridge roost.

scholarly journals REPRODUCTIVE BIOLOGY OF MALE MEXICAN FREE-TAILED BATS (TADARIDA BRASILIENSIS MEXICANA)

2002 ◽  
Vol 83 (2) ◽  
pp. 489-500 ◽  
Author(s):  
Philip H. Krutzsch ◽  
Theodore H. Fleming ◽  
Elizabeth G. Crichton
Keyword(s):  
Reproductive Biology ◽  
Tadarida Brasiliensis ◽  
Tadarida Brasiliensis Mexicana

Reproduction affects flight activity in female and male Daubenton’s bats, Myotis daubentoni

2007 ◽  
Vol 85 (5) ◽  
pp. 653-664 ◽  
Author(s):  
M. Dietz ◽  
E.K.V. Kalko
Keyword(s):  
Energy Demand ◽  
Late Summer ◽  
Climatic Conditions ◽  
Flight Activity ◽  
Adult Males ◽  
Reproductive Condition ◽  
Small Individual ◽  
Pregnant Females ◽  
Pregnancy And Lactation ◽  
Lactating Females

Nearly all mammals in the temperate zone breed in spring and summer when climatic conditions are favourable and food is abundant. Similar to other mammals, food requirements of female bats are particularly high during pregnancy and lactation and of males during spermatogenesis. Seasonal changes in energy demand and reproductive condition should therefore result in different foraging activity within and between sexes. This assumption was tested on 16 adult females and 13 adult males of the Palaearctic Daubenton’s bat, Myotis daubentoni (Kuhl, 1817), that were radio-tracked during pregnancy, lactation, and post-lactation periods. Pregnant females, as hypothesized, flew significantly longer (mean: 358.9 min; 70% of the night length) than males (mean: 228.5 min; 42.4% of the night length) during spring. In contrast, nightly flight time of lactating females decreased and was significantly less than that of pregnant females, but was similar to that of males during the same period. The longest flight times of males were registered during late summer when spermatogenetic activity is high. However, there were distinct differences in the use of foraging areas between female and male Daubenton’s bats. Female bats used small, individual foraging areas during pregnancy and lactation. The pattern was reversed in females after the young had been weaned and in males after they entered spermatogenesis. Overall, the results confirmed our proposition that flight activity reflects the higher energy demand and nutrition requirements in the different reproductive periods.

Parasites of Tadarida brasiliensis mexicana (Chiroptera: Molossidae) from Arid Regions of Mexico

2003 ◽  
Vol 70 (1) ◽  
pp. 11-25 ◽  
Author(s):  
Carmen Guzmán-Cornejo ◽  
Luis García-Prieto ◽  
Gerardo Pérez-Ponce de León ◽  
Juan B. Morales-Malacara
Keyword(s):  
Arid Regions ◽  
Tadarida Brasiliensis ◽  
Tadarida Brasiliensis Mexicana

Genetic Structure in Migratory Populations of the Bat Tadarida brasiliensis mexicana

1994 ◽  
Vol 75 (2) ◽  
pp. 500-514 ◽  
Author(s):  
G. F. Mccracken ◽  
M. K. Mccracken ◽  
A. T. Vawter
Keyword(s):  
Genetic Structure ◽  
Tadarida Brasiliensis ◽  
Tadarida Brasiliensis Mexicana

scholarly journals Molt of the Gray Vireo

The Condor ◽  
2000 ◽  
Vol 102 (3) ◽  
pp. 610-618 ◽  
Author(s):  
Gary Voelker
Keyword(s):  
United States ◽  
Late Summer ◽  
Museum Specimens ◽  
Adult Males ◽  
Wintering Grounds ◽  
Dietary Shift ◽  
Breeding Grounds ◽  
Wintering Areas ◽  
Desert Regions ◽  
Northwestern Mexico

AbstractUsing museum specimens, I document the molt cycles and molting grounds of the Gray Vireo (Vireo vicinior). During prebasic molts, adult female Gray Vireos replace their primaries in 57 days, whereas adult males take 70 days; all body plumage is replaced during this molt. Prebasic molts occur almost exclusively on the breeding grounds; just 3 of 41 specimens replacing primaries were collected away from breeding grounds. No molting specimens were collected from wintering areas. Prealternate molt occurs on the wintering grounds, and appears limited to the replacement of innermost secondaries and a limited molt of body plumage. By performing prebasic molt on breeding grounds, the Gray Vireo differs from several other western breeding passerine species that use desert regions of the southwestern United States and northwestern Mexico to exploit late summer food resources. The areas of these southwestern desert regions used by other species form a small portion of the breeding grounds, and encompass the entire wintering grounds, of Gray Vireos. I hypothesize that this contrast in molting regions is not due to differences in the general timing of prebasic molts among these species; rather, the contrast may be due to constraints imposed on Gray Vireos by a dietary shift to fruit during winter and the need to defend winter territories.

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