Nestedness of bee assemblages in an endemic South American forest: the role of pine matrix and small fragments

Valdovinos, Fernanda S.; Chiappa, Elizabeth; Simonetti, Javier A.

doi:10.1007/s10841-008-9182-1

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…Since the pioneering studies on habitat networks (Patterson and Atmar, 1986) and its later applications in conservation science (e.g. Patterson, 1987; Lomolino, 1996; Valdovinos et al ., 2009), we could bring back this conceptual framework by applying recent advances in network ecology to elucidate the effect of landscape alterations on habitat specialisation (Marini et al ., 2019). Our species–habitat network approach revealed a complex architecture of associations between multiple landscape elements and entire communities of natural enemies and pollinators.…”

Section: Discussionmentioning

confidence: 99%

Species–habitat networks elucidate landscape effects on habitat specialisation of natural enemies and pollinators

et al. 2020

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Measuring habitat specialisation is pivotal for predicting species extinctions and for understanding consequences on ecosystem functioning. Here, we sampled pollinator and natural enemy communities in all major habitat types occurring across multiple agricultural landscapes and used species–habitat networks to determine how habitat specialisation changed along gradients in landscape composition and configuration. Although it is well known that landscape simplification often causes the replacement of specialists with generalists, our study provided evidence for intraspecific variation in habitat specialisation, highlighting how a large number of arthropod species adapted their way of selecting habitat resources depending on the landscape structure. Groups with higher diet specialisation and limited foraging flexibility appeared to have a reduced ability to respond to landscape changes, indicating that some arthropod taxa are better able than others to adapt to an increasingly broad set of resources and persist in highly impacted landscapes.

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Section: Discussionmentioning

confidence: 99%

Species–habitat networks elucidate landscape effects on habitat specialisation of natural enemies and pollinators

et al. 2020

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“…This difference is a result of lower habitat quality (Henríquez et al, 2009). Therefore, more detailed studies related to morphological changes associated with flight function are needed because they may offer important insights on the colonization and extinction tendencies of the populations (e.g., Colas et al, 2004, Henríquez et al, 2009, Valdovinos et al, 2009) and thus provide valuable information for the conservation and restoration of populations living in fragmented landscapes. As indicated by the findings cited above for B. dahlbomii and C. chilensis, habitat fragmentation can impact not only the size of the remaining populations but also the morphological features of the surviving individuals.…”

Section: Discussionmentioning

confidence: 99%

Changes in wing length in the pollinator Bombus dahlbomii occurring with the fragmentation of the Maulino forest, Chile

2011

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The purpose of this research is to test this prediction in Bombus dahlbomii (Guérin), a native Chilean pollinator associated with the fragmented Maulino forest. We used hanging traps to collect individuals in the continuous native forest, in four small forest remnants and in two Pinus radiata plantations (matrix). We measured the body size (mm) and the length of the first and the second pairs of wings (mm) of each individual collected. In all, 280 individuals were captured. The body size and the length of both the first and the second pairs of wings were higher in the forest fragments and the matrix than in the continuous forest. A significant positive relationship between wing length and body size was observed for all habitats, but the percentage of variance explained was lower in the continuous forest than in the fragments and the matrix. These results suggest that the fragmentation of the Maulino forest would favor phenotypes with larger wings. It is probable that these phenotypes would be best at flying and obtaining scarce resources during foraging.

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“…The effects of fragmentation can be further influenced by the matrix habitat surrounding them. For instance, pine plantations increase connectivity for most bee species between isolated patches of South American forest, but they seem to act as a barrier for at least one bee species (115).…”

Section: Landscape Contextmentioning

confidence: 99%

The Role of Resources and Risks in Regulating Wild Bee Populations

Roulston

Goodell

2011

Annu. Rev. Entomol.

553

439

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Recent declines of bee species have led to great interest in preserving and promoting bee populations for agricultural and wild plant pollination. Many correlational studies have examined the indirect effects of factors such as landscape context and land management practices and found great variation in bee response. We focus here on the evidence for effects of direct factors (i.e., food resources, nesting resources, and incidental risks) regulating bee populations and then interpret varied responses to indirect factors through their species-specific and habitat-specific effects on direct factors. We find strong evidence for food resource availability regulating bee populations, but little clear evidence that other direct factors are commonly limiting. We recommend manipulative experiments to illuminate the effects of these different factors. We contend that much of the variation in impact from indirect factors, such as grazing, can be explained by the relationships between indirect factors and floral resource availability based on environmental circumstances.

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Nestedness of bee assemblages in an endemic South American forest: the role of pine matrix and small fragments

Cited by 8 publications

References 14 publications

Species–habitat networks elucidate landscape effects on habitat specialisation of natural enemies and pollinators

Species–habitat networks elucidate landscape effects on habitat specialisation of natural enemies and pollinators

Changes in wing length in the pollinator Bombus dahlbomii occurring with the fragmentation of the Maulino forest, Chile

The Role of Resources and Risks in Regulating Wild Bee Populations

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