Changes in the distribution of multispecies pest assemblages affect levels of crop damage in warming tropical Andes.
Glob Chang Biol
; 21(1): 82-96, 2015 Jan.
Article
em En
| MEDLINE
| ID: mdl-24920187
Climate induced species range shifts might create novel interactions among species that may outweigh direct climatic effects. In an agricultural context, climate change might alter the intensity of competition or facilitation interactions among pests with, potentially, negative consequences on the levels of damage to crop. This could threaten the productivity of agricultural systems and have negative impacts on food security, but has yet been poorly considered in studies. In this contribution, we constructed and evaluated process-based species distribution models for three invasive potato pests in the Tropical Andean Region. These three species have been found to co-occur and interact within the same potato tuber, causing different levels of damage to crop. Our models allowed us to predict the current and future distribution of the species and therefore, to assess how damage to crop might change in the future due to novel interactions. In general, our study revealed the main challenges related to distribution modeling of invasive pests in highly heterogeneous regions. It yielded different results for the three species, both in terms of accuracy and distribution, with one species surviving best at lower altitudes and the other two performing better at higher altitudes. As to future distributions our results suggested that the three species will show different responses to climate change, with one of them expanding to higher altitudes, another contracting its range and the other shifting its distribution to higher altitudes. These changes will result in novel areas of co-occurrence and hence, interactions of the pests, which will cause different levels of damage to crop. Combining population dynamics and species distribution models that incorporate interspecific trade-off relationships in different environments revealed a powerful approach to provide predictions about the response of an assemblage of interacting species to future environmental changes and their impact on process rates.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Mudança Climática
/
Solanum tuberosum
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Dinâmica Populacional
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Altitude
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Mariposas
Tipo de estudo:
Prognostic_studies
Limite:
Animals
País/Região como assunto:
America do sul
Idioma:
En
Revista:
Glob Chang Biol
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
França
País de publicação:
Reino Unido