An extended patch-dynamic framework for food chains in fragmented landscapes

Liao, Jinbao; Chen, Jiehong; Zhao, Ying; Hiebeler, David E.; Nijs, Ivan

doi:10.1038/srep33100

Cited by 36 publications

(43 citation statements)

References 70 publications

(133 reference statements)

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“…To represent this, we restrict the colonization rate of such species by a factor of q s/s , which is proportional to habitat fragment size (Liao et al. ).…”

Section: Methodsmentioning

confidence: 99%

“…A particular colony of a species that disperses in this way can only colonize a subset of the suitable patches within the landscape, i.e., those in the same habitat fragment. To represent this, we restrict the colonization rate of such species by a factor of q s/s , which is proportional to habitat fragment size (Liao et al 2016a).…”

Section: Incorporating Habitat Fragmentation In Patch Occupancy Modelsmentioning

confidence: 99%

“…1e). Thus the number of colonizable patches for such a species is given by the clustering degree of its colonies with unoccupied suitable patches, which can be found using a pair approximation (Appendix S1; Matsuda et al 1992, Harada and Iwasa 1994, Boots and Sasaki 2000, Liao et al 2013b, Ying et al 2014, Liao et al 2015, 2016a.…”

Section: Incorporating Habitat Fragmentation In Patch Occupancy Modelsmentioning

confidence: 99%

“…Using numerical solutions of this system, we investigate how habitat loss, fragmentation and the combination of both affect species persistence. Additionally we consider how the robustness of the whole community to habitat destruction is affected by the presence of an omnivorous top predator, rather than one that feeds only on species 2 (i.e., a simple food chain; Liao et al 2016a). A broad range of biologically reasonable parameter combinations were investigated (Appendix S2: Figs.…”

Section: Model System and Analytical Approachmentioning

confidence: 99%

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Robustness of metacommunities with omnivory to habitat destruction: disentangling patch fragmentation from patch loss

Liao

Bearup

Wang

et al. 2017

Ecology

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Habitat destruction, characterized by patch loss and fragmentation, is a major driving force of species extinction, and understanding its mechanisms has become a central issue in biodiversity conservation. Numerous studies have explored the effect of patch loss on food web dynamics, but ignored the critical role of patch fragmentation. Here we develop an extended patch-dynamic model for a tri-trophic omnivory system with trophic-dependent dispersal in fragmented landscapes. We found that species display different vulnerabilities to both patch loss and fragmentation, depending on their dispersal range and trophic position. The resulting trophic structure varies depending on the degree of habitat loss and fragmentation, due to a tradeoff between bottom-up control on omnivores (dominated by patch loss) and dispersal limitation on intermediate consumers (dominated by patch fragmentation). Overall, we find that omnivory increases system robustness to habitat destruction relative to a simple food chain.

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“…To represent this, we restrict the colonization rate of such species by a factor of q s/s , which is proportional to habitat fragment size (Liao et al. ).…”

Section: Methodsmentioning

confidence: 99%

Section: Incorporating Habitat Fragmentation In Patch Occupancy Modelsmentioning

confidence: 99%

Section: Incorporating Habitat Fragmentation In Patch Occupancy Modelsmentioning

confidence: 99%

Section: Model System and Analytical Approachmentioning

confidence: 99%

See 2 more Smart Citations

Robustness of metacommunities with omnivory to habitat destruction: disentangling patch fragmentation from patch loss

Liao

Bearup

Wang

et al. 2017

Ecology

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“…Much work has explored the separate effects of habitat area loss and habitat fragmentation on species persistence (Liao et al 2016). However, when defining guidelines for conservation, it is important to recognize that habitat should be both abundant and well connected, in order to be easily available for a population (Saura & Pascual-Hortal 2007).…”

Section: T H E P R O B a B I L I T Y O F C O N N E C T I V I T Y I N mentioning

confidence: 99%

Single‐node vs. multi‐node centrality in landscape graph analysis: key habitat patches and their protection for 20 bird species in NE Spain

2017

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Summary Habitat connectivity is a major concern in biodiversity conservation. Network analysis provides efficient tools for assessing landscape connectivity and identifying priority areas for protection. Widespread approaches consist of ranking individual habitat patches by their importance for connectivity. However, depending on the spatial arrangement of patches, and on the complementarity or redundancies between different patches in the network, the group of patches that together best contribute to connectivity may differ from the top individual patches. Here we apply individual ranking (single‐node) and group prioritization (multi‐node) methods to identify key patches in the habitat network of 20 bird species in Catalonia, Spain. We compare single‐node evaluation using the landscape index probability of connectivity (PC) and two multi‐node evaluations that focus on two different aspects of connectivity: reachability and fragmentation. We quantify how well the species’ habitats and key patches are covered by the Natura 2000 network of protected areas, as given by all three methods. We discuss some species‐specific differences between results, and general, multi‐species solutions. The key patches for reachability were widely scattered, while patches that best prevented fragmentation were concentrated in core areas. Key patches according to single‐node PC were in intermediate position, although more similar to the fragmentation patches. The patches that minimized fragmentation were highlighted as more crucial for low‐mobility species, while reachability patches scored higher for long‐distance dispersers. For most species, the key patches were not better protected than total habitat. We identify two main areas that concentrate priority patches for all the studied species (including the endangered Neophron percnopterus) and offer suggestions for the potential improvement of the Natura 2000 network. Our work provides a significant step towards the inclusion of multi‐node prioritization in landscape network analysis. The concept of multi‐node reachability, especially, provides an additional viewpoint to the assessment of connectivity. The multi‐patch algorithm we applied optimizes efficiency, overcoming computational limits associated with the high number of combinations that potentially arise in multi‐node analysis. We believe that a combination of multi‐node evaluations and PC has the potential to increase the realism and applicability of landscape network analysis for biodiversity conservation.

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The role of omnivory in mediating metacommunity robustness to habitat destruction

Liao

Bearup

Fagan

2020

Ecology

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Citation: Liao, J., D. Bearup, and W. F. Fagan. 2020. The role of omnivory in mediating metacommunity robustness to habitat destruction. Ecology 101(6):Abstract. Omnivores have long been known to play an important role in determining the stability of ecological communities. Recent theoretical studies have suggested that they may also increase the resilience of their communities to habitat destruction, one of the major drivers of species extinctions globally. However, these outcomes were obtained for minimal food webs consisting of only a single omnivore and its prey species, while much more complex communities can be anticipated in nature. In this study, we undertake a systematic comparative analysis of the robustness of metacommunities containing various omnivory structures to habitat loss and fragmentation using a mathematical model. We observe that, in general, omnivores are better able to survive facing habitat destruction than specialist predators of similar trophic level. However, the community as a whole does not always benefit from the presence of omnivores, as they may drive their intraguild prey to extinction. We also analyze the frequency with which these modules occur in a set of empirical food webs, and demonstrate that variation in their rate of occurrence is consistent with our model predictions. Our findings demonstrate the importance of considering the complete food web in which an omnivore is embedded, suggesting that future study should focus on more holistic community analysis.

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An extended patch-dynamic framework for food chains in fragmented landscapes

Cited by 36 publications

References 70 publications

Robustness of metacommunities with omnivory to habitat destruction: disentangling patch fragmentation from patch loss

Robustness of metacommunities with omnivory to habitat destruction: disentangling patch fragmentation from patch loss

Single‐node vs. multi‐node centrality in landscape graph analysis: key habitat patches and their protection for 20 bird species in NE Spain

The role of omnivory in mediating metacommunity robustness to habitat destruction

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