Comparative social network analysis in a leaf-roosting bat

Chaverri, Gloriana

doi:10.1007/s00265-010-0975-3

Cited by 68 publications

(53 citation statements)

References 59 publications

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“…Preferred roost trees may not always be bald cypress, because greater reliance on water túpelo by Rafinesque's big-eared bats has been reported in other studies (Carver and Ashley 2008;Gooding and Langford 2004;Rice 2009). Roost availability also was found to influence social networks of Spix's disc-winged bat {Thyrop-tera tricolor-) in Costa Rica (Chaverri 2010). Chaverri (2010) concluded that several aspects of network stmcture, including clustering coefficient, betweenness, and path length, varied among social networks in an "almost linear fashion" with roost availability.…”

Section: Resultsmentioning

confidence: 96%

“…Roost availability also was found to influence social networks of Spix's disc-winged bat {Thyrop-tera tricolor-) in Costa Rica (Chaverri 2010). Chaverri (2010) concluded that several aspects of network stmcture, including clustering coefficient, betweenness, and path length, varied among social networks in an "almost linear fashion" with roost availability.…”

Section: Resultsmentioning

confidence: 96%

“…The number, nature, and density of ties among individuals in a social group are just a few measures of social networks that can be applied to better understand social structure and dynamics of bat colonies (Krause et al 2007(Krause et al , 2009Wey et al 2008). Social network analysis provides a well-established theoretical framework and methodologies for understanding sociality by examining linkages among individuals, and has recently been applied in studies of sociality in bats (Chaverri 2010;Fortuna et al 2009;Kerth et al 2011;Patriquin et al 2010;Scott 2000). Social network analysis encompasses numerous research methods, many of which can be classified as nodal or network measures.…”

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confidence: 98%

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Social networks of Rafinesque's big-eared bats (Corynorhinus rafinesquii) in bottomland hardwood forests

Johnson¹,

Kropczynski²,

Lacki³

et al. 2012

J Mammal

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Understanding social relationships and organization in colonial bat species can provide valuable insight into species ecology and potentially aid in conservation efforts of rare bat species. We applied social network analysis to describe social relationships and organization in 3 colonies of Rafinesque's big-eared bats {Corynorhinus rafinesquU) roosting in bottomland hardwood forests in Kentucky. We radiotracked 48 adult big-eared bats to 64 day-roosts over 549 bat-days during the summers of 2009-2011. We measured homophily, network centralization, density, transitivity, and core-periphery structure of networks of bats sharing common roosts, and we measured degree centrality of nodes (bats or roosts) within networks. Pattems of ties within each colony were homophilous by sex (E-I index = -0.87). Males were consistently the least central nodes in bat networks. Bat network centralization ranged from 1.2% to 40% among colonies, and roost network centralization ranged from 17% to 40%. The colony exhibiting the least centralized and most dense bat network also occupied habitat with low roost availability. This roost network was highly centralized, with bats frequently aggregating at a single roost. The colony with the most centralized and least dense bat network occupied habitat with a greater availability of roosts, resulting in diffuse networks of bats and roosts. Transitivity decreased after young became volant in the colony with highest roost availability. Our findings suggest that social structure in colonies of Rafinesque's big-eared bats is affected by the sex of individuals in colonies, reproductive season, and tbe preponderance of available day-roosting habitat.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 96%

mentioning

confidence: 98%

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Social networks of Rafinesque's big-eared bats (Corynorhinus rafinesquii) in bottomland hardwood forests

Johnson¹,

Kropczynski²,

Lacki³

et al. 2012

J Mammal

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“…Developing leaves remain furled for up to 60 h, forcing bats to switch roosts daily (Vonhof & Fenton, 2004). Despite the reliance of T. tricolor on such an ephemeral roosting resource, bats form long-lasting stable social groups composed primarily of close kin (Buchalski, Chaverri, & Vonhof, 2014;Chaverri, 2010). The specialized roosting ecology of T. tricolor, coupled with the cohesive social structure observed in roosting groups, suggest the presence of behavioural strategies that enable individuals to regroup after periods of separation.…”

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confidence: 98%

Behavioural strategies associated with using an ephemeral roosting resource in Spix's disc-winged bat

Montero

Gillam

2015

Animal Behaviour

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The limited availability of refuges may represent an important factor promoting the evolution of sociality, particularly in bats. Spix's disc-winged bats (Thyroptera tricolor) show highly specialized morphological adaptations that enable individuals to roost inside furled musoid leaves. This roosting ecology presents major challenges, as leaves rapidly unfurl, forcing bats to locate new roosts on a daily basis. Despite the reliance of T. tricolor on such ephemeral roosting resources, bats form stable group associations. This social stability has been attributed to the potential benefits that group members gain from searching for new roosts together versus alone. The purpose of our study was to characterize the behavioural patterns associated with assessing roosts and any accompanying communication strategies of Spix's disc-winged bat. We determined that bats regularly monitor furled leaves within their roosting range, during which they emit a number of distinct social calls. Roost assessment involved close inspection of leaf dimensions and surroundings, and was mostly performed by single individuals. Thyroptera tricolor's call repertoire during flight indicates that group contact involves a combination of acoustic signals. Our approach in a natural setting provides valuable insight into the role of shelter stability in the evolution of the T. tricolor social system.

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“…Yet, the fact that leaves suitable for roosting unfurl in approximately 1 day means that individuals must locate a new structure every day while remaining in a cohesive group. Thyroptera tricolor is quite capable of accomplishing these tasks, and is actually rare among bats for its unusually high levels of group stability [38,43]. Previous studies suggest that group cohesion despite daily roost changes is possible owing to the use of small roosting territories [38,42], by selectively flying near group members, and by being able to discriminate among the response calls of group and nongroup members [29].…”

Section: Discussionmentioning

confidence: 99%

Sound amplification by means of a horn-like roosting structure in Spix's disc-winged bat

Chaverri

Gillam

2013

Proc. R. Soc. B.

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While sound is a signal modality widely used by many animals, it is very susceptible to attenuation, hampering effective long-distance communication. A strategy to minimize sound attenuation that has been historically used by humans is to use acoustic horns; to date, no other animal is known to use a similar structure to increase sound intensity. Here, we describe how the use of a roosting structure that resembles an acoustic horn (the tapered tubes that form when new leaves of plants such as Heliconia or Calathea species start to unfurl) increases sound amplification of the incoming and outgoing social calls used by Spix's disc-winged bat (Thyroptera tricolor) to locate roosts and group members. Our results indicate that incoming calls are significantly amplified as a result of sound waves being increasingly compressed as they move into the narrow end of the leaf. Outgoing calls were faintly amplified, probably as a result of increased sound directionality. Both types of call, however, experienced significant sound distortion, which might explain the patterns of signal recognition previously observed in behavioural experiments. Our study provides the first evidence of the potential role that a roost can play in facilitating acoustic communication in bats.

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Comparative social network analysis in a leaf-roosting bat

Cited by 68 publications

References 59 publications

Social networks of Rafinesque's big-eared bats (Corynorhinus rafinesquii) in bottomland hardwood forests

Social networks of Rafinesque's big-eared bats (Corynorhinus rafinesquii) in bottomland hardwood forests

Behavioural strategies associated with using an ephemeral roosting resource in Spix's disc-winged bat

Sound amplification by means of a horn-like roosting structure in Spix's disc-winged bat

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