Search results for: Audrey A. Grez

Items from 1 to 20 out of 26 results

article

A roadmap for ladybird conservation and recovery

António O. Soares, Danny Haelewaters, Olga M. C. C. Ameixa, Isabel Borges, more

Conservation Biology > 37 > 1 > n/a - n/a

Ladybirds (Coleoptera: Coccinellidae) provide services that are critical to food production, and they fulfill an ecological role as a food source for predators. The richness, abundance, and distribution of ladybirds, however, are compromised by many anthropogenic threats. Meanwhile, a lack of knowledge of the conservation status of most species and the factors driving their population dynamics hinders...

article

Forestry clear‐cuts increase environmental temperatures, affecting the ecophysiological responses of specialized beetles in fragmented landscapes

Rodrigo M. Barahona‐Segovia, Audrey A. Grez, Claudio Veloso

Journal of Applied Entomology > 146 > 5 > 557 - 569

The forestry practice of clear‐cutting (the removal of all woody vegetation) results in a range of negative impacts on ectotherm physiology and behaviour. Organisms in these habitats can experience elevated body temperature due to increases in air and soil temperature, affecting their performance. In this study, we evaluated the effect of ambient temperature (air and soil), habitat type (clear‐cut,...

article

The positive association between natural vegetation, native coccinellids and functional diversity of aphidophagous coccinellid communities in alfalfa

Audrey A. Grez, Tania Zaviezo, Fernando Casanoves, Romina Oberti, more

Insect Conservation and Diversity > 14 > 4 > 464 - 475

A greater taxonomic and functional diversity of natural enemies in agroecosystems is frequently positively associated with more effective pest control, due to the complementarity of species or traits. But this diversity has declined with landscape homogenisation and loss of natural covers, particularly losing native species, which play an important role in pest suppression within crops. We evaluated...

article

The failed invasion of Harmonia axyridis in the Azores, Portugal: Climatic restriction or wrong population origin?

Alberto J. Alaniz, António O. Soares, Pablo M. Vergara, Eduardo Brito Azevedo, more

Insect Science > 28 > 1 > 238 - 250

We tested two questions: (i) whether the climatic conditions of the Azorean Islands in Portugal may have restricted the invasion of Harmonia axyridis across this archipelago and (ii) determine what population of this species could have a higher probability of invading the islands. We used MaxEnt to project the climate requirements of different H. axyridis populations from three regions of the world,...

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Exotic ladybirds for biological control of herbivorous insects – a review

Gabriele Rondoni, Isabel Borges, Jana Collatz, Eric Conti, more

Entomologia Experimentalis et Applicata > 169 > 1 > 6 - 27

Since the late 19th century, exotic ladybirds (Coleoptera: Coccinellidae) have been used extensively for suppressing herbivorous insects of economic importance. In recent decades, the introduction of non‐native biological control (BC) agents has been greatly limited due to the awareness of the potential non‐target effects of introductions. Nonetheless, recent episodes of biological invasions of economically...

article

Field margin floral enhancements increase pollinator diversity at the field edge but show no consistent spillover into the crop field: a meta‐analysis

Jorge Zamorano, Ignasi Bartomeus, Audrey A. Grez, Lucas Alejandro Garibaldi

Insect Conservation and Diversity > 13 > 6 > 519 - 531

Conventional intensification of agriculture has reduced the availability of resources for pollinators, reducing their diversity and affecting plant pollination, both in natural habitats and croplands. Field margin floral enhancements such as flower strips or restored field margins could counteract these negative effects. The approaches to assess the success of these management measures generally...

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How does the replacement of native forest by exotic forest plantations affect the diversity, abundance and trophic structure of saproxylic beetle assemblages?

Andrés Fierro, Audrey A. Grez, Pablo M. Vergara, Alfredo Ramírez-Hernández, more

Forest Ecology and Management > 2017 > 405 > C > 246-256

Native forest in central Chile has been increasingly replaced by exotic forest plantations. In particular, saproxylic beetles could be highly sensitive to exotic forest plantations due to the clear-cutting management decreases deadwood accumulation while promoting the incompleteness of the decay cycle. We assessed the diversity and density of saproxylic beetle species at two spatial levels (habitat...

article

Accompanying vegetation in young Pinus radiata plantations enhances recolonization by Ceroglossus chilensis (Coleoptera: Carabidae) after clearcutting

Lia A. Russek, Carolina L. Mansilla, Silvio J. Crespin, Javier A. Simonetti, more

Journal of Insect Conservation > 2017 > 21 > 5-6 > 943-950

The replacement of native forests by Pinus radiata plantations modifies habitat availability and quality for wildlife, constituting a threat to species survival. However, the presence of understory in mature pine plantations minimizes the negative impacts of native forest replacement, rendering a secondary habitat for wildlife. Whether forest-dwelling species recolonize clear-felled areas pending...

article

In the shadow of the condor: invasive Harmonia axyridis found at very high altitude in the Chilean Andes

Audrey A. Grez, Tania Zaviezo, Helen E. Roy, Peter M. J. Brown, more

Insect Conservation and Diversity > 10 > 6 > 483 - 487

Harmonia axyridis has invaded many regions of the world, with negative effects on local biodiversity, and thus it is of global concern for biological conservation. Recently it has invaded central Chile, one of the world's biodiversity hotspots, where the abundance and richness of ladybird species, particularly native species in agroecosystems, have declined following its arrival. Harmonia axyridis...

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Predators and parasitoids of the harlequin ladybird, Harmonia axyridis, in its native range and invaded areas

Piotr Ceryngier, Oldřich Nedvěd, Audrey A. Grez, Eric W. Riddick, more

Biological Invasions > 2018 > 20 > 4 > 1009-1031

The harlequin ladybird Harmonia axyridis (Coleoptera: Coccinellidae) has rapidly spread in several continents over the past 30 years and is considered an invasive alien species. The success of H. axyridis as an invader is often attributed to weak control by natural enemies. In this paper, we provide an overview of current knowledge on predators and parasitoids of H. axyridis. The common feature of...

article

Occupancy pattern of a long-horned beetle in a variegated forest landscape: linkages between tree quality and forest cover across spatial scales

Pablo M. Vergara, Luis O. Meneses, Audrey A. Grez, Madelaine S. Quiroz, more

Landscape Ecology > 2017 > 32 > 2 > 279-293

Context Interactions between landscape-scale processes and fine-grained habitat heterogeneity are usually invoked to explain species occupancy in fragmented landscapes. In variegated landscapes, however, organisms face continuous variation in micro-habitat features, which makes necessary to consider ecologically meaningful estimates of habitat quality at different spatial scales. Objectives We evaluated...

article

Rapid spread of Harmonia axyridis in Chile and its effects on local coccinellid biodiversity

Audrey A. Grez, Tania Zaviezo, Helen E. Roy, Peter M. J. Brown, more

Diversity and Distributions > 22 > 9 > 982 - 994

Aim Biological invasions are one of the major threats to biodiversity. Usually highly disturbed anthropogenic habitats favour invasion by alien species such as the coccinellid Harmonia axyridis. The spread and impact of this species has been documented in Europe and North America, but no information exists for South America. The aims of this study were to: (1) document the process of invasion of...

article

Testing the hypothesis of greater eurythermality in invasive than in native ladybird species: from physiological performance to life‐history strategies

RODRIGO M. BARAHONA‐SEGOVIA, AUDREY A. GREZ, FRANCISCO BOZINOVIC

Ecological Entomology > 41 > 2 > 182 - 191

1. Global warming and biological invasions are important threats to biodiversity. Nonetheless, there is little information on how these factors influence performance or life‐history traits of invasive and native species. 2. The effects of temperature on physiological and fitness traits of two invasive alien species (Harmonia axyridis and Hippodamia variegata) and one native species (Eriopis chilensis...

article

Diversity distribution of saproxylic beetles in Chilean Mediterranean forests: influence of spatiotemporal heterogeneity and perturbation

Alejandra García-López, Ana Paola Martínez-Falcón, Estefanía Micó, Patricia Estrada, more

Journal of Insect Conservation > 2016 > 20 > 4 > 723-736

Mediterranean ecosystems have been recognized as a priority for biodiversity conservation due to their high levels of species richness and endemism. In South America, these environments are restricted to central Chile and represent a biodiversity hotspot. The study of saproxylic beetles in this area is an unexplored topic, despite the ecological role they play in these ecosystems and their potential...

article

The harlequin ladybird, Harmonia axyridis: global perspectives on invasion history and ecology

Helen E. Roy, Peter M. J. Brown, Tim Adriaens, Nick Berkvens, more

Biological Invasions > 2016 > 18 > 4 > 997-1044

The harlequin ladybird, Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), is native to Asia but has been intentionally introduced to many countries as a biological control agent of pest insects. In numerous countries, however, it has been introduced unintentionally. The dramatic spread of H. axyridis within many countries has been met with considerable trepidation. It is a generalist top predator,...

article

The role of the understory on the abundance, movement and survival of Ceroglossus chilensis in pine plantations: an experimental test

Yendery Cerda, Audrey A. Grez, Javier A. Simonetti

Journal of Insect Conservation > 2015 > 19 > 1 > 119-127

Tree plantations may play a role in the conservation of global forest biodiversity. At the landscape scale, plantations with a complex understory may provide surrogate habitats for forest-dwelling organisms. This was tested using a manipulative experiment in which the abundance, movement and survivorship of Ceroglossus chilensis (an endemic and flightless ground beetle) was examined...

article

The heterogeneity and composition of agricultural landscapes influence native and exotic coccinellids in alfalfa fields

Audrey A. Grez, Tania Zaviezo, Jaime Hernández, Annia Rodríguez‐San Pedro, more

Agricultural and Forest Entomology > 16 > 4 > 382 - 390

The current trend toward simplification of agricultural landscapes, as well as the associated loss of perennial cover types, can decrease landscape heterogeneity and also natural enemy abundance and diversity, favouring exotic species.We evaluated the effects of agricultural landscape composition and heterogeneity at two different spatial scales (radii of 250 and 1000 m), on the diversity and abundance...

article

Local predator composition and landscape affects biological control of aphids in alfalfa fields

Audrey A. Grez, Tania Zaviezo, Mary M. Gardiner

Biological Control > 2014 > 76 > Complete > 1-9

The biological control service supplied to croplands is a result of the predator community present within a focal crop, which is likely influenced by surrounding landscape composition and configuration. In this study, using cage experiments in two regions near Santiago, we determined if predator communities supplied a significant biological control service in alfalfa fields, examined how the abundance...

article

Providing Habitat for Native Mammals through Understory Enhancement in Forestry Plantations

JAVIER A. SIMONETTI, AUDREY A. GREZ, CRISTIÁN F. ESTADES

Conservation Biology > 27 > 5 > 1117 - 1121

The Convention on Biological Diversity (CBD) expects forestry plantations to contribute to biodiversity conservation. A well‐developed understory in forestry plantations might serve as a surrogate habitat for native species and mitigate the negative effect of plantations on species richness. We experimentally tested this hypothesis by removing the understory in Monterey pine (Pinus radiata) plantations...

article

Land use intensification differentially benefits alien over native predators in agricultural landscape mosaics

Audrey A. Grez, Tatyana A. Rand, Tania Zaviezo, Francisca Castillo‐Serey, more

Diversity and Distributions > 19 > 7 > 749 - 759

AimBoth anthropogenic habitat disturbance and the breadth of habitat use by alien species have been found to facilitate invasion into novel environments, and these factors have been hypothesized to be important within coccinellid communities specifically. In this study, we address two questions: (1) Do alien species benefit more than native species from human‐disturbed habitats? (2) Are alien species...

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INFONA - science communication portal

Search results for: Audrey A. Grez

A roadmap for ladybird conservation and recovery

Forestry clear‐cuts increase environmental temperatures, affecting the ecophysiological responses of specialized beetles in fragmented landscapes

The positive association between natural vegetation, native coccinellids and functional diversity of aphidophagous coccinellid communities in alfalfa

The failed invasion of Harmonia axyridis in the Azores, Portugal: Climatic restriction or wrong population origin?

Exotic ladybirds for biological control of herbivorous insects – a review

Field margin floral enhancements increase pollinator diversity at the field edge but show no consistent spillover into the crop field: a meta‐analysis

How does the replacement of native forest by exotic forest plantations affect the diversity, abundance and trophic structure of saproxylic beetle assemblages?

Accompanying vegetation in young Pinus radiata plantations enhances recolonization by Ceroglossus chilensis (Coleoptera: Carabidae) after clearcutting

In the shadow of the condor: invasive Harmonia axyridis found at very high altitude in the Chilean Andes

Predators and parasitoids of the harlequin ladybird, Harmonia axyridis, in its native range and invaded areas

Occupancy pattern of a long-horned beetle in a variegated forest landscape: linkages between tree quality and forest cover across spatial scales

Rapid spread of Harmonia axyridis in Chile and its effects on local coccinellid biodiversity

Testing the hypothesis of greater eurythermality in invasive than in native ladybird species: from physiological performance to life‐history strategies

Diversity distribution of saproxylic beetles in Chilean Mediterranean forests: influence of spatiotemporal heterogeneity and perturbation

The harlequin ladybird, Harmonia axyridis: global perspectives on invasion history and ecology

The role of the understory on the abundance, movement and survival of Ceroglossus chilensis in pine plantations: an experimental test

The heterogeneity and composition of agricultural landscapes influence native and exotic coccinellids in alfalfa fields

Local predator composition and landscape affects biological control of aphids in alfalfa fields

Providing Habitat for Native Mammals through Understory Enhancement in Forestry Plantations

Land use intensification differentially benefits alien over native predators in agricultural landscape mosaics

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