Vocalisation and its association with androgens and corticosterone in a night frog (<i>Nyctibatrachus humayuni</i>) with unique breeding behaviour

Joshi, Amruta M.; Narayan, Edward; Gramapurohit, Narahari P.

doi:10.1111/eth.12931

Cited by 6 publications

(5 citation statements)

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“…By using uGMs, valuable information can also be obtained regarding the influence of the stress endocrine system on amphibian reproduction (Joshi et al, 2019a). For example, research in both captive and free-living amphibian species have successfully applied uGMs to study the interactions between corticosterone and reproductive hormones, body condition, and breeding behavior (e.g., vocalization in males and vitellogenesis in females; Joshi et al, 2019b).…”

Section: Validation Of Urinary Corticosterone Profilingmentioning

confidence: 99%

Non-invasive Methods for Measuring and Monitoring Stress Physiology in Imperiled Amphibians

et al. 2019

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Global climate change is negatively impacting global biodiversity and ectothermic vertebrates, with amphibians being the most imperiled vertebrate taxa. Increased mean global atmospheric temperatures, high rates of habitat degradation, and exposure to infectious diseases, such as chytridiomycosis, have contributed to population declines and extinctions of rare and endangered amphibian species. Field-based monitoring of physiological endocrine traits can help determine the sub-lethal effects of environmental stressors and provide early alerts when populations are chronically stressed. Recent advances in amphibian stress endocrinology include the development and use of non-invasive methods to quantify the glucocorticoid, or stress biomarker, corticosterone. Non-invasive methods, such as urinary, skin and buccal swabs, and water-borne hormone monitoring methods (suited for terrestrial and aquatic dwelling species), are available to quantify baseline and short-term physiological stress responses of amphibians under field settings. In this review, we illustrate, by using two case studies of aquatic and terrestrial amphibian species, the applications of non-invasive corticosterone monitoring methods to advance the ecological knowledge and conservation of imperiled amphibian species, discuss the limitations of these methods, and provide future directions for the use of non-invasive hormone monitoring methods. We highlight the use of non-invasive field endocrinology methods to monitor the impacts of environmental stressors on the physiology of amphibians, which can be applied to advance ecological research, conservation, and management of imperiled species.

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Section: Validation Of Urinary Corticosterone Profilingmentioning

confidence: 99%

Non-invasive Methods for Measuring and Monitoring Stress Physiology in Imperiled Amphibians

et al. 2019

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“…Insights from animal behaviour are currently under-utilised in conservation research despite having many promising applications (Angeloni et al 2008;Berger-Tal et al 2016). Vocalising is a highly important behaviour for many species, with a variety of uses including territory defence (Krebs et al 1978;Harrington and Mech 1979;Amorim and Neves 2008) and mate acquisition (Harrington and Asa 2003;Joshi et al 2019). Integrating the protection of habitats that permit vocalisation into landscape management is, therefore, vital to the conservation of many vocalising species.…”

Section: Discussionmentioning

confidence: 99%

“…Vocalising is a highly important behaviour for many species, with a variety of uses including territory defence (Krebs et al . 1978; Harrington and Mech 1979; Amorim and Neves 2008) and mate acquisition (Harrington and Asa 2003; Joshi et al . 2019).…”

Section: Discussionmentioning

confidence: 99%

Combining acoustic localisation and high-resolution land cover classification to study predator vocalisation behaviour

et al. 2023

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Context. The ecology of cryptic animals is difficult to study without invasive tagging approaches or labour-intensive field surveys. Acoustic localisation provides an effective way to locate vocalising animals using acoustic recorders. Combining this with land cover classification gives new insight into wild animal behaviour using non-invasive tools. Aims. This study aims to demonstrate how acoustic localisationcombined with high-resolution land cover classificationpermits the study of the ecology of vocalising animals in the wild. We illustrate this technique by investigating the effect of land cover and distances to anthropogenic features on coyote and wolf vocal behaviour. Methods. We collected recordings over 13 days in Wisconsin, USA, and triangulated vocalising animals' locations using acoustic localisation. We then mapped these locations onto land cover using a high-resolution land cover map we produced for the area. Key results. Neither coyotes nor wolves vocalised more in one habitat type over another. Coyotes vocalised significantly closer to all human features than expected by chance, whereas wolves vocalised significantly further away. When vocalising closer to human features, coyotes selected forests but wolves showed no habitat preference. Conclusions. This novel combination of two sophisticated, autonomous sensing-driven tools permits us to examine animal land use and behavioural ecology using passive sensors, with the aim of drawing ecologically important conclusions. Implications. We envisage that this method can be used at larger scales to aid monitoring of vocally active animals across landscapes. Firstly, it permits us to characterise habitat use while vocalising, which is an essential behaviour for many species. Furthermore, if combined with additional knowledge of how a species' habitat selection while vocalising relates to its general habitat use, this method could permit the derivation of future conclusions on prevailing landscape use. In summary, this study demonstrates the potential of integrating acoustic localisation with land cover classification in ecological research.

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“…We studied N. humayuni at two locations in Maharashtra (Adarwadi village, Pune district, 18° 25.838’N, 73° 24.085’ E, 634 metres above sea level, and Matheran, Raigad district, 19°00’N, 73°17’E, 800 metres above sea level) in June-July 2019. Matheran is a known locality for N. humayuni (Biju et al 2011; Gramapurohit et al 2011; Joshi et al 2019). These localities comprise mid-elevation wet evergreen forest, receiving about 4073 mm rainfall annually (Sawant et al 2020).…”

Section: Methodsmentioning

confidence: 99%

“…humayuni (Biju et al 2011;Gramapurohit et al 2011;Joshi et al 2019). These localities comprise mid-elevation wet evergreen forest, receiving about 4073 mm rainfall annually (Sawant et al 2020).…”

Section: Study Sitesmentioning

confidence: 99%

Behavioral context shapes vocal sequences in two anuran species with different repertoire sizes

Bhat

Saka

et al. 2021

Preprint

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Acoustic signals in animals serve to convey context-dependent information to receivers. Birds and mammals combine diverse sounds into complex sequences to communicate, but these sequences largely remain understudied in other taxa. Anuran vocalizations are a prominent feature of their life history, and function in defense of territories and to attract mates. However, despite the spectacular diversity of anurans in tropical regions of the world, vocal diversity and communication strategies remain relatively poorly studied. Specifically, studies of vocal sequences and context-dependent vocal patterns in frogs remain few. Here, we investigated the context-dependent vocal repertoire and the use of vocal sequences by two anuran species belonging to different lineages, both endemic to the hyper-diverse Western Ghats of India. By recording vocal sequences both when frogs were alone and in the presence of a territorial rival, we present evidence that both species modify their vocal repertoire according to context. Specifically, one species appends notes to generate more complex sequences, whereas the other shifts to different note types, resulting in different sequences for different contexts. Thus, despite differences in repertoire size, both frog species are capable of adjusting the temporal sequence of vocalizations to communicate in different contexts. This study highlights the need for further studies of insular frogs, to understand how diversification across these continental islands has influenced the evolution of vocal repertoires, vocal sequence patterns and communication systems.Lay SummaryAnimals employ complex sequences of acoustic signals to communicate in diverse behavioral contexts. Here, we demonstrate that two frog species with different vocal repertoires both modify the sequence of note emissions in the presence of a territorial rival. These patterns demonstrate that anurans are capable of complex shifts in the patterns of their vocalization, to communicate different messages to different receivers. Our findings demonstrate the value of studying behavioral diversity in tropical regions.

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Vocalisation and its association with androgens and corticosterone in a night frog (Nyctibatrachus humayuni) with unique breeding behaviour

Cited by 6 publications

References 53 publications

Non-invasive Methods for Measuring and Monitoring Stress Physiology in Imperiled Amphibians

Non-invasive Methods for Measuring and Monitoring Stress Physiology in Imperiled Amphibians

Combining acoustic localisation and high-resolution land cover classification to study predator vocalisation behaviour

Behavioral context shapes vocal sequences in two anuran species with different repertoire sizes

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