Seasonality of vocal activity of a bird community in an Afrotropical lowland rain forest

Vokurková, Jana; Motombi, Francis Njie; Ferenc, Michal; Hořák, David; Sedláček, Ondřej

doi:10.1017/s0266467418000056

Cited by 23 publications

(18 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…surveys between pre‐Isaac and the third day after it landed, between the third and 14th day after the hurricane, and so on). We used a Bray–Curtis distance measure to calculate a dissimilarity index for each site (Corte et al , Vokurkova et al ), and ternary plots to visualize the relative contribution of the three components of β diversity to overall differences between consecutive time periods. In the ternary plots, values of replacement, abundance difference, and similarity decide the position of each dot (representing the difference in community structure measured between consecutive time periods) in the plot.…”

Section: Methodsmentioning

confidence: 99%

Effects of a tropical cyclone on salt marsh insect communities and post‐cyclone reassembly processes

et al. 2020

View full text Add to dashboard Cite

Concepts regarding effects of recurrent natural disturbances and subsequent responses of communities are central to ecology and conservation biology. Tropical cyclones constitute major disturbances producing direct effects (damage, mortality) in many coastal communities worldwide. Subsequent reassembly involves changes in composition and abundance for which the underlying mechanisms (deterministic and stochastic processes) are still not clear, especially for mobile organisms. We examined tropical cyclone-induced changes in composition and reassembly of entire insect communities in 16 Louisiana coastal salt marshes before and after Hurricane Isaac in 2012 and 2013. We used the Shannon index and multivariate permutational ANOVA to study insect resistance and resilience, β diversity partitioning to evaluate the importance of species replacement, and null models to disentangle the relative roles of different assembly processes over time after the tropical cyclone. The α diversity and species composition, overall and for different trophic levels, decreased immediately after the tropical cyclone; nonetheless, both then increased rapidly and returned to pre-cyclone states within one year. Changes in species abundance, rather than species replacement, was the primary driver, accounting for most temporal dissimilarity among insect communities. Stochastic processes, which drove community composition immediately after the tropical cyclone, decreased in importance over time. Our study indicates that rapid reformation of insect communities involved sequential landscape-level dynamics. Cyclone-resistant life cycle stages apparently survived in some, perhaps random locations within the overall salt marsh landscape. Subsequently, stochastic patterns of immigration of mobile life cycle stages resulted in rapid reformation of local communities. Post-cyclone direct regeneration of salt marsh insect communities resulted from low resistance, coupled with high landscape-level resilience via re-immigration. Our study suggests that the extent of direct regeneration of local salt marsh insect communities might change with the size of larger marsh landscapes within which they are imbedded.

show abstract

Section: Methodsmentioning

confidence: 99%

Effects of a tropical cyclone on salt marsh insect communities and post‐cyclone reassembly processes

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Increasing application of deep learning to such problems will likely help provide a solution (e.g., Sethi et al, 2020b) as will continued efforts to build labelled sound libraries from which automated species detection algorithms can be trained (Deichmann et al, 2018). Moreover, soundscape dynamics are frequently characterised by strong seasonal cycles (e.g., Vokurková et al, 2018), presenting a challenge when attempting to disentangle disturbance responses from seasonal soundscape change (Ross et al, 2023). For example, our focal species differ in their seasonality and phenology, meaning that natural phenological differences may in part be responsible for the differences in species' typhoon responses we observed here.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, soundscape dynamics are frequently characterised by strong seasonal cycles ( e . g ., Vokurková et al, 2018), presenting a challenge when attempting to disentangle disturbance responses from seasonal soundscape change (Ross et al, 2023). For example, our focal species differ in their seasonality and phenology, meaning that natural phenological differences may in part be responsible for the differences in species’ typhoon responses we observed here.…”

Section: Discussionmentioning

confidence: 99%

Divergent ecological responses to typhoon disturbance revealed via landscape-scale acoustic monitoring

Ross

Friedman

Armitage

et al. 2023

Preprint

View full text Add to dashboard Cite

Climate change is increasing the frequency, intensity, and duration of extreme weather events across the globe. Understanding the capacity for ecological communities to withstand and recover from such events is critical. Typhoons are extreme weather events that are expected to broadly homogenise ecosystems through structural damage to vegetation and longer-term effects of salinization. Given their unpredictable nature, monitoring ecological responses to typhoons is challenging, particularly for mobile animals such as birds. Here, we report spatially variable ecological responses to typhoons across terrestrial landscapes. Using a high temporal resolution passive acoustic monitoring network across 24 sites on the subtropical island of Okinawa, Japan, we found that typhoons elicit divergent ecological responses among Okinawa's pristine forests, as indicated by increased spatial variability of biological sound production (biophony) among forested sites. However, no such post-typhoon shift in variability was observed among developed urban or agricultural sites. This indicates that natural forests have a diversity of pathways through which communities can respond to typhoons, whereas land use development produces communities more constrained in their disturbance responses. That is, spatial insurance effects among forest communities may provide resilience to typhoons at the landscape scale, but this spatial insurance was diminished by habitat degradation through land use development. Though site-level typhoon impacts on soundscapes and bird detections were not particularly strong, we nevertheless revealed spatial heterogeneity in typhoon responses, owing to the data resolution afforded to us by monitoring at scale (high temporal resolution, broad spatial extent). Our findings underscore the importance of natural forests in insuring ecosystems against disturbance, and demonstrate the potential of landscape-scale acoustic sensor networks for documenting the understudied ecological impacts of unpredictable extreme weather events.

show abstract

“…Acoustic data were collected during the breeding season ( temperate mainland : April 2017; temperate island : March 2017; tropical mainland : November 2016; tropical island : September 2016). Dates of fieldwork differ among the four communities but are equivalent in terms of timing of the breeding season (Christy & Clarke, 1998; Jones & Tye, 2006; Garcia‐del‐Rey, 2011; Serle, 1981; Vokurková et al, 2018; Billerman et al, 2020). The recording apparatus consisted of four unidirectional microphones ME66/K6 [Sennheiser] (flat frequency response between 40 Hz and 20 kHz) coupled with a FR2 recorder [Fostex] and three Song Meter SM3 recorders [Wildlife Acoustics] equipped with omnidirectional microphones.…”

Section: Methodsmentioning

confidence: 99%

Patterns of bird song evolution on islands support the character release hypothesis in tropical but not in temperate latitudes

Robert

Melo

Lengagne

et al. 2021

J of Evolutionary Biology

View full text Add to dashboard Cite

The character release hypothesis—which predicts that a decline in interspecific competition leads to the expansion of trait expression—remains to be tested for communication signals. Taking advantage of the fact that oceanic islands host fewer species than the mainland, we tested whether island birds show an increase in frequency bandwidth of acoustic signals compared with mainland birds. Given the higher animal diversity and more saturated acoustic space in the tropics, we expected acoustic character release, if any, to be stronger in the tropics than in the temperate zone. We field recorded 22 bird species (11 pairs consisting of an endemic island species and its closest mainland relative) breeding at similar latitudes and in similar habitats: six tropical pairs (São Tomé Island/Mount Cameroon) and five temperate pairs (Madeira Island/southern France). For each species, we measured the degree of acoustic interference experienced when vocalizing and the spectral characteristics of its song (minimum and maximum frequencies, bandwidth). As expected, island species spent more time vocalizing alone, and any overlap in vocalizations involved fewer species. The vocalizations of island species spanned broader frequency bandwidths than their mainland counterparts in the tropics (true for all six pairs), but this pattern was less evident in the temperate region (2/5 pairs with no marked differences and 1/5 with opposite pattern). Overall, the character release of communication signals only occurred where the differential in number of species was large (tropics). We discuss latitude differences and the potential factors driving the observed differences.

show abstract

Seasonality of vocal activity of a bird community in an Afrotropical lowland rain forest

Cited by 23 publications

References 47 publications

Effects of a tropical cyclone on salt marsh insect communities and post‐cyclone reassembly processes

Effects of a tropical cyclone on salt marsh insect communities and post‐cyclone reassembly processes

Divergent ecological responses to typhoon disturbance revealed via landscape-scale acoustic monitoring

Patterns of bird song evolution on islands support the character release hypothesis in tropical but not in temperate latitudes

Contact Info

Product

Resources

About