La estacionalidad climática no afecta la fenología de murciélagos cavernícolas con dieta omnívora

Ferreyra-García, Daniel; Saldaña‐Vázquez, Romeo A.; Schondube, Jorge E.

doi:10.22201/ib.20078706e.2018.2.2016

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…This synchrony has been recorded in both Pipistrellus nathusii and Nictalus noctule, where an increase in abundance co-occurs with pup independence not only in forested areas in the Americas, but also in farmlands in Europe (Racey and Entwistle 2000;Klingbeil and Willig 2010;Heim et al 2016). We do not have information on the timing of breeding bats in our study site; however, pregnant females of Myotis velifer have been reported at the end of the dry season in temperate forests close to Morelia (Ferreyra-García et al 2018). Nursing and pregnant females of frugivorous Dermanura azteca and Artibeus lituratus have also been captured in Morelia city in the mid-dry season (Chavez-Estrada Pers.…”

Section: Discussionsupporting

confidence: 51%

Picky City Bats: Variation in Urban Conditions Generates a Suitability Gradient that Structures the Bat Community.

Rodríguez-Ramírez

Salinas-Melgoza²,

Salinas-Melgoza

et al. 2021

Preprint

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The transformation of natural systems into urban cities represents a radical habitat modification and one that generates species-specific effects on bat communities. Cities present heterogeneous mosaics of urban conditions, which the bats can inhabit differentially by utilizing their intrinsic characteristics. We expected bat species richness, number of abundant species and feeding guilds to be positively impacted by an increased degree of suitability for bats in certain areas interspersed in the city. We also expected that the number of dominant species would follow an inverse pattern, with some species being fostered in less suitable areas for bats. We determined the levels of suitability for the presence of bats in urban-based basic geostatistical units (BGUs) in the Neotropical city of Morelia, in Michoacán state, Mexico. We identified three levels of suitability for bats, low, medium and high, using the percentage of arboreal vegetation and constructed and open areas in the BGUs. We monitored the bat assemblage monthly over an annual cycle using autonomous ultrasonic recorders to assess the abundance of each species at each suitability level. Across all three suitability levels throughout the year, we found a high dominance of three insectivorous bat species that forage in open areas. Diversity measures supported our predictions, agreeing with bat flight and foraging functional traits. These results highlight the importance of city features in driving bat diversity and how urban planning that fails to consider key city features, such as arboreal areas in the city, may reduce suitability for bats, leading changes in diversity.

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Section: Discussionsupporting

confidence: 51%

Picky City Bats: Variation in Urban Conditions Generates a Suitability Gradient that Structures the Bat Community.

Rodríguez-Ramírez

Salinas-Melgoza²,

Salinas-Melgoza

et al. 2021

Preprint

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Ambient temperature drives sex ratio and presence of pregnant females of Anoura geoffroyi (Phyllostomidae) bats living in temperate forests

Saldaña‐Vázquez

Ortega²,

Guerrero

et al. 2019

Journal of Mammalogy

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Phenology in animals is strongly influenced by seasonality that promotes changes in abundance of food resources and temperature. These changes may impose energetic constraints to organisms in certain seasons during the year, especially on those animals facing high energetic demands, such as nectarivorous bats. Seasonality in temperate forests could, therefore, promote migration of female nectarivorous bat to find warmer sites, thus enhancing breeding success. To test this hypothesis, we compared the proportion of females and the proportion of pregnant females of the nectarivorous bat Anoura geoffroyi, between months, in six different populations across temperate forests of Mexico. Bats were captured over a complete season cycle either with sweep or mist nets at the entrance or near their roosting caves, and their age, sex, and reproductive condition were recorded. We found that over 50% of bats present in the cave roosts across different populations in temperate forests of the Trans-Mexican Neovolcanic Belt of Mexico during the warmer and wetter months (April–September) were females, both pregnant and nonpregnant. In contrast, fewer than 30% of bats present in the roosting caves sampled in the colder and drier months (October–March) were females. In addition, we found that the temperature that favors the proportion of females at the studied sites was greater than 8°C. We concluded that seasonality affects sex ratio and phenology of A. geoffroyi in Mexican temperate forests. Our findings suggest females’ migrations to lowland warmer sites to improve prenatal development.

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The big brown bat (Eptesicus fuscus) reduces its body mass during winter in a tropical montane ecosystem of central Mexico

2022

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Most animals face changes in the availability of food and the environmental conditions in the places where they live. In response, they need to adjust their behavioral, physiological, and morphological traits. In temperate zones and high latitudes, bats increase their body mass (M b ) in autumn to store fat reserves and use them during hibernation. However, other small mammals decrease their M b prior to winter to reduce the energetic requirements of individuals. These changes are unknown for bats inhabiting other highly energetic demanding environments. We measured changes in M b of 84 non-reproductive males of Eptesicus fuscus inhabiting a tropical montane ecosystem in central Mexico over seasons. We also examined the relationship of bats’ M b with the minimum ambient temperature (T a , °C) and mean precipitation (mm). Bats presented an increase in M b from March to June, followed by a decrease from September to November and presented the lowest M b from November to March, in the dry-cold season. The results suggest that the pattern of changes in M b could be the result of two non-exclusive components related to the bats’ energy budget, the energetic demands experienced by the bats throughout the year and the morphological adaptations animals could display to reduce their energy requirements during the winter.

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La estacionalidad climática no afecta la fenología de murciélagos cavernícolas con dieta omnívora

Cited by 3 publications

References 32 publications

Picky City Bats: Variation in Urban Conditions Generates a Suitability Gradient that Structures the Bat Community.

Picky City Bats: Variation in Urban Conditions Generates a Suitability Gradient that Structures the Bat Community.

Ambient temperature drives sex ratio and presence of pregnant females of Anoura geoffroyi (Phyllostomidae) bats living in temperate forests

The big brown bat (Eptesicus fuscus) reduces its body mass during winter in a tropical montane ecosystem of central Mexico

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