Do Collared Peccaries Negatively Impact Understory Insectivorous Rain Forest Birds Indirectly Via Lianas and Vines?

Michel, Nicole L.; Carson, Walter P.

doi:10.1111/btp.12261

Cited by 10 publications

(10 citation statements)

References 66 publications

(158 reference statements)

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“…Although beyond the scope of our present study, the evidence for geographic variation in the role of diet (Jiguet et al 2007;Van Turnhout et al 2010;Reif et al 2011) supports further investigation based on spatial variation in the underlying drivers, such as the extent and type of land-use change (Donald et al 2001). Beyond Europe, in the tropical forests of Central America, declines in insectivorous birds are associated with changes in habitat structure rather than reduced food availability (Sekercioglu et al 2002;Michel et al 2015).…”

Section: Discussionsupporting

confidence: 61%

“…; Michel et al. ) are declining. However, it remains to be determined whether insectivorous birds in Europe are declining more than other birds across different habitats.…”

Section: Introductionmentioning

confidence: 97%

“…Diet explains some interspecific variation in long-term trends for some European populations Reif et al 2011) but not others (Jiguet et al 2007). In North America, aerial insectivores are declining (Nebel et al 2010), whereas in Central America, understory tropical forest insectivores (Sekercioglu et al 2002;Sigel et al 2006;Michel et al 2015) are declining. However, it remains to be determined whether insectivorous birds in Europe are declining more than other birds across different habitats.…”

mentioning

confidence: 99%

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Long‐term declines of European insectivorous bird populations and potential causes

Bowler

Heldbjerg

Fox

et al. 2019

Conservation Biology

240

168

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Evidence of declines in insect populations has recently received considerable scientific and societal attention. However, the lack of long‐term insect monitoring makes it difficult to assess whether declines are geographically widespread. By contrast, bird populations are well monitored and often used as indicators of environmental change. We compared the population trends of European insectivorous birds with those of other birds to assess whether patterns in bird population trends were consistent with declines of insects. We further examined whether declines were evident for insectivores with different habitats, foraging strata, and other ecological preferences. Bird population trends were estimated for Europe (1990–2015) and Denmark (1990–2016). On average, insectivores declined over the study period (13% across Europe and 28% in Denmark), whereas omnivores had stable populations. Seedeaters also declined (28% across Europe; 34% in Denmark), but this assessment was based on fewer species than for other groups. The effects of insectivory were stronger for farmland species (especially grassland species), for ground feeders, and for cold‐adapted species. Insectivory was associated with long‐distance migration, which was also linked to population declines. However, many insectivores had stable populations, especially habitat generalists. Our findings suggest that the decline of insectivores is primarily associated with agricultural intensification and loss of grassland habitat. The loss of both seed and insect specialists indicates an overall trend toward bird communities dominated by diet generalists.

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Section: Discussionsupporting

confidence: 61%

“…; Michel et al. ) are declining. However, it remains to be determined whether insectivorous birds in Europe are declining more than other birds across different habitats.…”

Section: Introductionmentioning

confidence: 97%

mentioning

confidence: 99%

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Long‐term declines of European insectivorous bird populations and potential causes

Bowler

Heldbjerg

Fox

et al. 2019

Conservation Biology

240

168

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“…die (Box 1). Large lianas are also an indicator of healthy primary forest in tropical lowlands (Clark, 1996), where liana tangles can also be crucial for threatened understorey animals (Michel et al, 2015). Some liana-dominated habitats are even protected as threatened ecosystems (Webb, 1959).…”

Section: Variation In Liana Ecology-parasites Parasitoids and Bandagesmentioning

confidence: 99%

Conceptualising the Global Forest Response to Liana Proliferation

Marshall

Platts

Chazdon

et al. 2020

Front. For. Glob. Change

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Lianas are woody vines, rooted in the soil, and supported physically by trees. Lianas contribute to forest ecosystem functioning globally, but especially in the tropics and subtropics. However, prolific liana growth following heavy disturbance frequently affects subsequent recovery of forest tree diversity, biomass, structure, and function. Understanding this forest liana dynamic, and its sensitivity to climate and anthropogenic forces, is essential for worldwide forest restoration and climate change mitigation. Here, we synthesise the evidence for both positive and negative effects of lianas on forests and propose a framework that outlines the expected global response of forests to disturbance-induced liana proliferation. Emerging evidence suggests that lianas play a major role in both facilitating and delaying forest recovery following disturbance. At low levels of disturbance and/or where environmental conditions favour tree growth, lianas can facilitate forest recovery by protecting trees from extreme weather, fire, weed invasion and herbivory. However, under conditions where lianas proliferate beyond critical thresholds, positive feedbacks are expected to induce and sustain liana-dominated forest states that can endure for decades or even longer. We conceptualise alternative classes of forest recovery response to disturbance and describe measurement and modelling of liana thresholds. We identify four essential challenges for global change science relating to lianas: (1) incorporation of lianas and sapling stems into forest monitoring and tree stand measurements worldwide; (2) long-term experiments to determine variation in liana-tree competition, and potential drivers across forest successional gradients; (3) identification and prediction of liana thresholds and other alternative forest recovery response classes; and (4) dynamic mechanistic modelling of forest recovery to determine regional and global variation within and among different recovery response classes, in relation to variation in potential drivers, liana feedbacks and their interactions. Addressing these challenges will determine the importance of lianas in shaping regional and global forest composition, recovery and dynamics.

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“…Lianas also support many arthropod species that are likely consumed by insectivorous birds (Odell et al 2019). Several species of rainforest understory birds, notably insectivorous antwrens and flycatchers, specialize on arthropods in dead leaf clusters caught in liana tangles (Gradwohl and Greenberg 1980), and densities of these specialist birds correlate with occurrence of liana tangles in the forest understory (Michel et al 2015 a ). Lianas provide perching, lekking, and breeding sites, as well as nest materials and nesting sites for many bird species (Michel et al 2015 b ).…”

Section: Introductionmentioning

confidence: 99%

Lianas maintain insectivorous bird abundance and diversity in a neotropical forest

Schnitzer

Michel

Powers

et al. 2020

Ecology

Self Cite

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The spatial habitat heterogeneity hypothesis posits that habitat complexity increases the abundance and diversity of species. In tropical forests, lianas add substantial habitat heterogeneity and complexity throughout the vertical forest profile, which may maintain animal abundance and diversity. The effects of lianas on tropical animal communities, however, remain poorly understood. We propose that lianas have a positive effect on animals by enhancing habitat complexity. Lianas may have a particularly strong influence on the forest bird community, providing nesting substrate, protection from predators, and nutrition (food). Understory insectivorous birds, which forage for insects that specialize on lianas, may particularly benefit. Alternatively, it is possible that lianas have a negative effect on forest birds by increasing predator abundances and providing arboreal predators with travel routes with easy access to bird nests. We tested the spatial habitat heterogeneity hypothesis on bird abundance and diversity by removing lianas, thus reducing forest complexity, using a large-scale experimental approach in a lowland tropical forest in the Republic of Panama. We found that removing lianas decreased total bird abundance by 78.4% and diversity by 77.4% after 8 months, and by 40.0% and 51.7%, respectively, after 20 months. Insectivorous bird abundance and diversity 8 months after liana removal were 91.8% and 89.5% lower, respectively, indicating that lianas positively influence insectivorous birds. The effects of liana removal persisted longer for insectivorous birds than other birds, with 77.3% lower abundance and 76.2% lower diversity after 20 months. Liana removal also altered bird community composition, creating two distinct communities in the control and removal plots, with disproportionate effects on insectivores. Our findings demonstrate that lianas have a strong positive influence on the bird community, particularly for insectivorous birds in the forest understory. Lianas may maintain bird abundance and diversity by increasing habitat complexity, habitat heterogeneity, and resource availability.

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Do Collared Peccaries Negatively Impact Understory Insectivorous Rain Forest Birds Indirectly Via Lianas and Vines?

Cited by 10 publications

References 66 publications

Long‐term declines of European insectivorous bird populations and potential causes

Long‐term declines of European insectivorous bird populations and potential causes

Conceptualising the Global Forest Response to Liana Proliferation

Lianas maintain insectivorous bird abundance and diversity in a neotropical forest

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