Marine and terrestrial food sources in the diet of the fish-eating myotis (Myotis vivesi)

Winter and Summer Torpor in a Free-Ranging Subtropical Desert Bat: The Fishing Myotis (Myotis vivesi)

“…In support of our interpretation, captive M. vivesi with free access to food did not enter torpor at night even when T a was 5°C (Carpenter, 1968). We consider that the use of torpor by M. vivesi is likely as sociated with foraging success on predominantly marine items (fish and crustaceans - Otálora et al, 2013). Partida Norte Island is located in the midriff region of the Gulf of California where marine primary productivity is higher in winter (Douglas et al, 2007), suggesting that limited food resources was not a trig ger for bats going into torpor.…”

“…These winds can produce a strong mixing of the water column, most likely affecting the foraging success of the fishing myotis on sea waters. This bat also feeds on terrestrial arthropods in winter but they are a small part of its diet (Otálora et al, 2013) and they might not be a viable option during sea foraging. Our first winter data supports the hypothesis that bats remain torpid in their roosts during windy nights.…”

“…The fishing myotis (Myotis vivesi Menegaux 1901, family Vespertilionidae) is a bat species endemic to several islands in the Gulf of California in North eastern Mexico that feeds primarily on marine fish and crustaceans (Herrera and Flores, 2001;Otálora et al, 2013). Similarly to other desert areas in North ern Mexico, the climate in the islands throughout this species' range fluctuates during the year, with clearly defined hot-wet and cold-dry seasons (Cody et al, 2002).…”

The cost of digestion in the fish-eating myotis (Myotis vivesi)

“…The diet of fish-eating myotis varies seasonally, with nearcomplete reliance on fish occurring in the autumn (September) and near-complete reliance on crustaceans in the winter (December; Otálora- Ardila et al, 2013). Additional studies are needed to confirm that prey type influences the magnitude of SDA and coefficient values in fish-eating myotis.…”

Demographic history of Heermann's Gull (Larus heermanni) from late Quaternary to present: Effects of past climate change in the Gulf of California

“…Some studies have set the time of population expansion at 190,000-130,000 yr BP (Pfeiler et al 2008, Liu et al 2011), others at 71,000-50,000 yr BP (Pfeiler et al 2005, Hurtado et al 2007, Díaz-Viloria et al 2012). These studies have focused almost exclusively on species that occur strictly in marine environments, such as fishes, mollusks, and crustaceans; one study considered a nonaquatic vertebrate (the fish-eating bat Myotis vivesi; Mejía et al 2011), which, though not inhabiting the ocean, lives on oceanic islands and feeds almost exclusively on marine fishes and crustaceans (Maya 1968, Otálora-Ardila et al 2013. Although studies of seabird genetics exist for other geographic regions (Milot et al 2007, Dantas et al 2012, Welch et al 2012, little is known about the effects of regional climate change on seabird demographic history in the Gulf of California.…”