Canopy Openness Enhances Diversity of Ant–Plant Interactions in the Brazilian Amazon Rain Forest

In closed‐canopy tropical forest understory, light availability is a significant determinant of habitat diversity because canopy structure is highly variable in most tropical forests. Consequently, variation in canopy cover affects the composition and distribution of plant species via creating varia...

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Published inBiotropica Vol. 46; no. 6; pp. 712 - 719
Main Authors Dáttilo, Wesley, Dyer, Lee
Format Journal Article
LanguageEnglish
Published Hoboken Association for Tropical Biology 01.11.2014
Blackwell Publishing Ltd
Wiley Periodicals Inc
Wiley Subscription Services, Inc
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Abstract In closed‐canopy tropical forest understory, light availability is a significant determinant of habitat diversity because canopy structure is highly variable in most tropical forests. Consequently, variation in canopy cover affects the composition and distribution of plant species via creating variable light environments. Nevertheless, little is known about how variation in canopy openness structures patterns of plant–animal interactions. Because of the great diversity and dominance of ants in tropical environments, we used ant–plant interactions as a focal network to evaluate how variation in canopy cover influences patterns of plant–insect interactions in the Brazilian Amazon rain forest. We observed that small increases in canopy openness are associated with increased diversity of ant–plant interactions in our study area, and this change is independent of plant or ant species richness. Additionally, we found smaller niche overlap for both ants and plants associated with greater canopy openness. We hypothesize that enhanced light availability increases the breadth of ant foraging sources because variation in light availability gives rise to plant resources of different quality and amounts. Moreover, greater light availability promotes vegetative growth in plants, creating ant foraging ‘bridges’ between plants. In sum, our results highlight the importance of environmental heterogeneity as a determinant of ant–plant interaction diversity in tropical environments.
AbstractList In closed-canopy tropical forest understory, light availability is a significant determinant of habitat diversity because canopy structure is highly variable in most tropical forests. Consequently, variation in canopy cover affects the composition and distribution of plant species via creating variable light environments. Nevertheless, little is known about how variation in canopy openness structures patterns of plant-animal interactions. Because of the great diversity and dominance of ants in tropical environments, we used ant-plant interactions as a focal network to evaluate how variation in canopy cover influences patterns of plant-insect interactions in the Brazilian Amazon rain forest. We observed that small increases in canopy openness are associated with increased diversity of ant-plant interactions in our study area, and this change is independent of plant or ant species richness. Additionally, we found smaller niche overlap for both ants and plants associated with greater canopy openness. We hypothesize that enhanced light availability increases the breadth of ant foraging sources because variation in light availability gives rise to plant resources of different quality and amounts. Moreover, greater light availability promotes vegetative growth in plants, creating ant foraging 'bridges' between plants. In sum, our results highlight the importance of environmental heterogeneity as a determinant of ant-plant interaction diversity in tropical environments.
In closed‐canopy tropical forest understory, light availability is a significant determinant of habitat diversity because canopy structure is highly variable in most tropical forests. Consequently, variation in canopy cover affects the composition and distribution of plant species via creating variable light environments. Nevertheless, little is known about how variation in canopy openness structures patterns of plant–animal interactions. Because of the great diversity and dominance of ants in tropical environments, we used ant–plant interactions as a focal network to evaluate how variation in canopy cover influences patterns of plant–insect interactions in the Brazilian Amazon rain forest. We observed that small increases in canopy openness are associated with increased diversity of ant–plant interactions in our study area, and this change is independent of plant or ant species richness. Additionally, we found smaller niche overlap for both ants and plants associated with greater canopy openness. We hypothesize that enhanced light availability increases the breadth of ant foraging sources because variation in light availability gives rise to plant resources of different quality and amounts. Moreover, greater light availability promotes vegetative growth in plants, creating ant foraging ‘bridges’ between plants. In sum, our results highlight the importance of environmental heterogeneity as a determinant of ant–plant interaction diversity in tropical environments. Resumo No interior do sub–bosque de densas florestas tropicais, a disponibilidade de luz é um fator que determina a diversidade de habitats, principalmente porque a estrutura do dossel é altamente variável na maioria das florestas tropicais. Consequentemente, a variação na cobertura do dossel afeta a composição e distribuição das espécies de plantas, criando ambientes com diferentes níveis de luz. No entanto, pouco é o conhecimento de como a variação na abertura do dossel estrutura os padrões de interações planta–animal. Devido a grande diversidade e dominância de formigas nos ambientes tropicais, nós usamos como modelo de estudo as interações formiga–planta em uma floresta tropical na Amazônia brasileira. Nós observamos que pequenas mudanças na abertura do dossel está associada com o aumento da diversidade das interações formiga–planta na nossa área de estudo, e essa mudança é independente da riqueza de formigas ou de plantas. Adicionalmente, nós encontramos baixa sobreposição de nicho tanto para formigas quanto de plantas em ambientes com maior abertura do dossel. Nós hipotetizamos que a disponibilidade de luz aumenta a possibilidade de forrageamento das formigas, uma vez que, a variação na disponibilidade de luz fornece diferentes quantidades e qualidades de recurso disponível nas plantas. Além disso, a maior disponibilidade de luz promove o crescimento vegetativo das plantas, criando “pontes” entre as plantas para o forrageamento das formigas. Em resumo, nossos resultados destacam a importância da heterogeneidade ambiental como um fator que determina a diversidade das interações formiga–planta em ambientes tropicais.
In closed‐canopy tropical forest understory, light availability is a significant determinant of habitat diversity because canopy structure is highly variable in most tropical forests. Consequently, variation in canopy cover affects the composition and distribution of plant species via creating variable light environments. Nevertheless, little is known about how variation in canopy openness structures patterns of plant–animal interactions. Because of the great diversity and dominance of ants in tropical environments, we used ant–plant interactions as a focal network to evaluate how variation in canopy cover influences patterns of plant–insect interactions in the Brazilian Amazon rain forest. We observed that small increases in canopy openness are associated with increased diversity of ant–plant interactions in our study area, and this change is independent of plant or ant species richness. Additionally, we found smaller niche overlap for both ants and plants associated with greater canopy openness. We hypothesize that enhanced light availability increases the breadth of ant foraging sources because variation in light availability gives rise to plant resources of different quality and amounts. Moreover, greater light availability promotes vegetative growth in plants, creating ant foraging ‘bridges’ between plants. In sum, our results highlight the importance of environmental heterogeneity as a determinant of ant–plant interaction diversity in tropical environments. No interior do sub–bosque de densas florestas tropicais, a disponibilidade de luz é um fator que determina a diversidade de habitats, principalmente porque a estrutura do dossel é altamente variável na maioria das florestas tropicais. Consequentemente, a variação na cobertura do dossel afeta a composição e distribuição das espécies de plantas, criando ambientes com diferentes níveis de luz. No entanto, pouco é o conhecimento de como a variação na abertura do dossel estrutura os padrões de interações planta–animal. Devido a grande diversidade e dominância de formigas nos ambientes tropicais, nós usamos como modelo de estudo as interações formiga–planta em uma floresta tropical na Amazônia brasileira. Nós observamos que pequenas mudanças na abertura do dossel está associada com o aumento da diversidade das interações formiga–planta na nossa área de estudo, e essa mudança é independente da riqueza de formigas ou de plantas. Adicionalmente, nós encontramos baixa sobreposição de nicho tanto para formigas quanto de plantas em ambientes com maior abertura do dossel. Nós hipotetizamos que a disponibilidade de luz aumenta a possibilidade de forrageamento das formigas, uma vez que, a variação na disponibilidade de luz fornece diferentes quantidades e qualidades de recurso disponível nas plantas. Além disso, a maior disponibilidade de luz promove o crescimento vegetativo das plantas, criando “pontes” entre as plantas para o forrageamento das formigas. Em resumo, nossos resultados destacam a importância da heterogeneidade ambiental como um fator que determina a diversidade das interações formiga–planta em ambientes tropicais.
In closed-canopy tropical forest understory, light availability is a significant determinant of habitat diversity because canopy structure is highly variable in most tropical forests. Consequently, variation in canopy cover affects the composition and distribution of plant species via creating variable light environments. Nevertheless, little is known about how variation in canopy openness structures patterns of plant-animal interactions. Because of the great diversity and dominance of ants in tropical environments, we used ant-plant interactions as a focal network to evaluate how variation in canopy cover influences patterns of plant-insect interactions in the Brazilian Amazon rain forest. We observed that small increases in canopy openness are associated with increased diversity of ant-plant interactions in our study area, and this change is independent of plant or ant species richness. Additionally, we found smaller niche overlap for both ants and plants associated with greater canopy openness. We hypothesize that enhanced light availability increases the breadth of ant foraging sources because variation in light availability gives rise to plant resources of different quality and amounts. Moreover, greater light availability promotes vegetative growth in plants, creating ant foraging 'bridges' between plants. In sum, our results highlight the importance of environmental heterogeneity as a determinant of ant-plant interaction diversity in tropical environments. Resumo No interior do sub-bosque de densas florestas tropicais, a disponibilidade de luz é um fator que determina a diversidade de habitats, principalmente porque a estrutura do dossel é altamente variável na maioria das florestas tropicais. Consequentemente, a variação na cobertura do dossel afeta a composição e distribuição das espécies de plantas, criando ambientes com diferentes níveis de luz. No entanto, pouco é o conhecimento de como a variação na abertura do dossel estrutura os padrões de interações planta-animal. Devido a grande diversidade e dominância de formigas nos ambientes tropicais, nós usamos como modelo de estudo as interações formiga-planta em uma floresta tropical na Amazônia brasileira. Nós observamos que pequenas mudanças na abertura do dossel está associada com o aumento da diversidade das interações formiga-planta na nossa área de estudo, e essa mudança é independente da riqueza de formigas ou de plantas. Adicionalmente, nós encontramos baixa sobreposição de nicho tanto para formigas quanto de plantas em ambientes com maior abertura do dossel. Nós hipotetizamos que a disponibilidade de luz aumenta a possibilidade de forrageamento das formigas, uma vez que, a variação na disponibilidade de luz fornece diferentes quantidades e qualidades de recurso disponível nas plantas. Além disso, a maior disponibilidade de luz promove o crescimento vegetativo das plantas, criando "pontes" entre as plantas para o forrageamento das formigas. Em resumo, nossos resultados destacam a importância da heterogeneidade ambiental como um fator que determina a diversidade das interações formiga-planta em ambientes tropicais.
Author Dáttilo, Wesley
Dyer, Lee
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Notes http://dx.doi.org/10.1111/btp.12157
Figure S1. Map showing the spatial arrangement of the 12 sampling plots.Table S1. All ant-plant interactions recorded in the 12 sampling plots.
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2010; 98
2006; 75
2009; 40
2010; 13
2010; 107
1990; 16
2004; 27
2010; 106
2004; 7
2010; 143
1997; 1
2008; 33
1998; 117
2011; 15
1988; 75
2007; 30
2007; 76
1999; 80
1993; 3
1950; 38
2004; 31
2010a; 42
2000
2000; 125
2002; 83
2004; 36
2000; 405
2012; 170
1949; 163
2005; 108
1943; 152
1961; 42
2000; 123
2001; 11
2010; 3
2012; 335
2010; 2
2003; 41
2005; 34
2007; 445
2004; 85
1997; 66
2012
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2011; 80
2013a; 38
2002; 130
1997; 131
1989; 133
1997
2010b; 91
2005; 86
2005
1994
2008; 203
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1992
2010; 40
1987; 18
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1984; 72
1957; 22
1990; 20
1966; 100
1980; 19
2001; 4
2006; 49
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2005; 95
2003; 24
2008; 89
2003; 28
1929; 16
1998; 70
2002; 71
1998; 30
2012; 6
2006; 148
2003; 300
2004; 118
2003; 100
2009; 38
1985; 230
2012; 42
2001; 30
2012; 85
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Snippet In closed‐canopy tropical forest understory, light availability is a significant determinant of habitat diversity because canopy structure is highly variable...
In closed-canopy tropical forest understory, light availability is a significant determinant of habitat diversity because canopy structure is highly variable...
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SubjectTerms abiotic factors
Amazonia
biodiversidade
biodiversity
canopy
diversidade de interações
ecological interactions
fatores abióticos
foraging
Formicidae
habitats
interaction diversity
interações ecológicas
interações planta-animal
light intensity
paisagens tropicais
plant-animal interactions
species diversity
Tropical Biology
tropical forests
tropical landscapes
understory
vegetative growth
Title Canopy Openness Enhances Diversity of Ant–Plant Interactions in the Brazilian Amazon Rain Forest
URI https://api.istex.fr/ark:/67375/WNG-SR2N46QW-2/fulltext.pdf
https://www.jstor.org/stable/44944796
https://onlinelibrary.wiley.com/doi/abs/10.1111%2Fbtp.12157
https://www.proquest.com/docview/1618201655
https://www.proquest.com/docview/1627984750
https://www.proquest.com/docview/1663628808
Volume 46
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