Effect of patch size on seed removal by harvester ants
Blanco Moreno, J.
Westerman, Paula Renate
MetadataShow full item record
The harvester ant Messor barbarus can be responsible for high weed seed losses in dryland cereals in Spain. Because weeds occur in patches, harvester ants have to be able to find and exploit patches. However, seed patches can differ in size and may, therefore, differ in the probability of being discovered and exploited. Here, 90 patches varying in size from 0.25 to 9 m2 were created in three 50 x 50 m subareas in a cereal field. Oat seeds were sown, as weed seed surrogates, in the patches at 2000 seeds m-2. After 24 h, those remaining were collected and the exploitation rate (the percentage of seeds removed per patch discovered by ants) was estimated. Harvester ant nests and the location of the seed patches were georeferenced and used to estimate distances between them. The patch encounter rate (the proportion of patches discovered by the ants) decreased slightly, but significantly, with decreasing patch size, though not the exploitation rate, which was lowest in the smallest patches (78-94%) and highest in the largest (99-100%). Seed patches that were not found or partially exploited were mostly located in subareas with a lower ant nest density or a longer distance away from the nearest nest than seed patches that were fully exploited. The results of this study indicate that the interaction between the spatial distribution of ant nests and the patchy distribution of seeds can create opportunities for seeds to be subjected to lower levels of predation.
Is part ofWeed Research, 2016, vol. 56, núm. 1, p. 14-21
European research projects
Showing items related by title, author, creator and subject.
Baraibar Padró, Bàrbara; Ledesma, Raquel; Royo-Esnal, Aritz; Westerman, Paula Renate (Elsevier, 2011)Harvester ants from the species Messor barbarus (L.) are important seed predators in semi-arid cereal fields of NE Spain, and can contribute substantially to weed control. However, occasionally they harvest newly sown crop ...
Spatial and temporal stability of weed patches in cereal fields under direct drilling and harrow tillage Izquierdo i Figarola, Jordi; Milne, Alice; Recasens i Guinjuan, Jordi; Royo-Esnal, Aritz; Torra Farré, Joel; Webster, R. (Richard); Baraibar Padró, Bàrbara (MDPI, 2020-03-25)The adoption of conservation agriculture (CA) techniques by farmers is changing the dynamics of weed communities in cereal fields and so potentially their spatial distribution. These changes can challenge the use of ...
Comas Rodríguez, Carles; Royo-Esnal, Aritz; Recasens i Guinjuan, Jordi; Torra Farré, Joel (Springer Verlag, 2016)The interaction between the spatial distribution of weed richness and weed cover and the spatial location of harvester ant nets was investigated in cereal fields. The understanding of such interdependencies can be relevant ...