Fragment edge and isolation affect the food web: effects on the strength of interactions among trophic guilds

Melo, Michele Molina; Silva, Cristina Magalhães; Barbosa, Carina Santos; Morais, Maristela Calvente; D'Anunciação, Paula Eveline Ribeiro; Silva, Vinícius Xavier da; Hasui, Érica

doi:10.1590/1676-0611-bn-2015-0088

Cited by 7 publications

(10 citation statements)

References 51 publications

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“…), but edge effects may change species dynamics and create non‐linear community responses (Melo et al. ).…”

Section: Introductionmentioning

confidence: 99%

“…Also, it remains unclear whether the relative importance of these trophic or non-trophic pathways shifts with the patch size of foundation species (Angelini et al 2015). This may be important as larger patches can sustain similar species densities (Li et al 2017), but edge effects may change species dynamics and create non-linear community responses (Melo et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Food or furniture: Separating trophic and non‐trophic effects of Spanish moss to explain its high invertebrate diversity

et al. 2019

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Foundation species are typically suggested to enhance community diversity non‐trophically by increasing habitat structure and mitigating physical stress, while their trophic role is considered of minor importance. Yet, there is little experimental evidence on the relative importance of trophic and non‐trophic effects and the interaction with patch size. Here, we transplanted different festoon sizes of living Tillandsia usneoides (Spanish moss) and structural mimics assessing the trophic and non‐trophic roles of this habitat‐forming epiphyte in mediating the invertebrate community. Compared to bare branches, mimics enhanced species and feeding guild richness and abundances, but living festoons even more so, demonstrating that trophic and non‐trophic effects jointly stimulated the community. Specifically, our results show that, independent of patch size, 40% of the total species richness and 46% of total guild richness increase could be contributed to habitat structure alone, while Spanish moss trophically stimulated these metrics by another 60% and 54%. As detritivores were particularly enhanced in living festoons, our findings suggest that trophic stimulation occurred primarily through the provisioning of Spanish moss detritus. Our results highlight that foundation species can facilitate their associated communities through both trophic and non‐trophic pathways, calling for studies addressing their indirect trophic role via the brown food web.

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“…), but edge effects may change species dynamics and create non‐linear community responses (Melo et al. ).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Food or furniture: Separating trophic and non‐trophic effects of Spanish moss to explain its high invertebrate diversity

et al. 2019

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“…Habitat loss and fragmentation may affect mammalian communities, especially by modifications in landscape matrix, which act as a selective filter for fauna (Ceballos & Ehrlich, 2002). The size, structure and shape of small fragments may contribute to form a mosaic of qualitatively different habitats throughout the landscape, providing greater heterogeneity and structural complexity (Bernardo & Melo, 2013;Fleschutz et al, 2016;Melo et al, 2016). Species show many kinds of responses to habitat fragmentation: some are advantaged and increase in abundance, while others decline and become locally extinct (Bennett & Saunders, 2010).…”

Section: Resultsmentioning

confidence: 99%

<b>Medium-sized mammals in peri-urban environments in southern Brazil

Tedesco

Silva

Zanella

2018

Acta Sci. Biol. Sci.

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Anthropic effects on natural environments caused by urban expansion or agriculture have been identified as one of the causes for the decline in species richness. In southern Brazil, the urbanization process affects the local fauna and reduces the diversity of mammalian species. This study was conducted from 2012 to 2015 with the objective of gathering information on mammalian species in a peri-urban area. Data was collected four consecutive days each month for 42 months using sand plots and visual searches. Occasional encounters and camera traps complemented were used to complement the data. We recorded 15 mammal species belonging to 10 families. The species with the highest abundance, taking into account all the applied methods, were Didelphis albiventris, Mazama gouazoubira and Cerdocyon thous. Four species were listed as endangered (Puma yagouaroundi, Leopardus guttulus, Nasua nasua, and Dasyprocta azarae).

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“…Agricultural land is inhospitable to most forest species [ 9 , 11 ] and such matrices exert pressure on forest fragments [ 20 , 21 ], working as a biodiversity filter, which affects the movement of species between and within fragments [ 9 ]. They may also exert negative influences by altering components of the food web [ 22 ], homogenizing the community [ 23 ], and facilitating the spread of exotic and invasive species [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Agricultural matrices affect ground ant assemblage composition inside forest fragments

et al. 2018

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The establishment of agricultural matrices generally involves deforestation, which leads to fragmentation of the remaining forest. This fragmentation can affect forest dynamics both positively and negatively. Since most animal species are affected, certain groups can be used to measure the impact of such fragmentation. This study aimed to measure the impacts of agricultural crops (matrices) on ant communities of adjacent lower montane Atlantic rainforest fragments. We sampled nine forest fragments at locations surrounded by different agricultural matrices, namely: coffee (3 replicates); sugarcane (3); and pasture (3). At each site we installed pitfall traps along a 500 m transect from the interior of the matrix to the interior of the fragment (20 pitfall traps ~25 m apart). Each transect was partitioned into four categories: interior of the matrix; edge of the matrix; edge of the fragment; and interior of the fragment. For each sample site, we measured ant species richness and ant community composition within each transect category. Ant richness and composition differed between fragments and matrices. Each sample location had a specific composition of ants, probably because of the influence of the nature and management of the agricultural matrices. Species composition in the coffee matrix had the highest similarity to its corresponding fragment. The variability in species composition within forest fragments surrounded by pasture was greatest when compared with forest fragments surrounded by sugarcane or, to a lesser extent, coffee. Functional guild composition differed between locations, but the most representative guild was ‘generalist’ both in the agricultural matrices and forest fragments. Our results are important for understanding how agricultural matrices act on ant communities, and also, how these isolated forest fragments could act as an island of biodiversity in an ‘ocean of crops’.

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Fragment edge and isolation affect the food web: effects on the strength of interactions among trophic guilds

Cited by 7 publications

References 51 publications

Food or furniture: Separating trophic and non‐trophic effects of Spanish moss to explain its high invertebrate diversity

Food or furniture: Separating trophic and non‐trophic effects of Spanish moss to explain its high invertebrate diversity

<b>Medium-sized mammals in peri-urban environments in southern Brazil

Agricultural matrices affect ground ant assemblage composition inside forest fragments

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