13 research outputs found
Foraging of Psilocybe basidiocarps by the leaf-cutting ant Acromyrmex lobicornis in Santa FĂ©, Argentina
The influence of hydrological regimes on sex ratios and spatial segregation of the sexes in two dioecious riparian shrub species in northern Sweden
River management practices have altered the hydrological regimes of many rivers and also altered the availability of regeneration niches for riparian species. We investigated the impact of changed hydrological regimes on the sex ratios and the Spatial Segregation of the Sexes (SSS) in the dioecious species Salix myrsinifolia Salisb.–phylicifolia L. and S. lapponum L. by studying the free-flowing Vindel River and the regulated Ume River in northern Sweden. We surveyed sex ratios of these species in 12 river reaches on the Vindel River and in 17 reaches on the Ume River. In addition, we surveyed the sex and location above mean river stage of 1,002 individuals across both river systems to investigate the SSS of both species. Cuttings were collected from male and female individuals of S. myrsinifolia–phylicifolia from both rivers and subjected to four different water table regimes in a greenhouse experiment to investigate growth response between the sexes. We found an M/F sex ratio in both river systems similar to the regional norm of 0.62 for S. myrsinifolia–phylicifolia and of 0.42 for S. lapponum. We found no evidence of SSS in either the free-flowing Vindel River or the regulated Ume River. In the greenhouse experiment, hydrological regime had a significant effect on shoot and root dry weight and on root length. Significantly higher shoot dry weights were found in females than in males and significantly different shoot and root dry weights were found between cuttings taken from the two rivers. We concluded that changed hydrological regimes are likely to alter dimensions of the regeneration niche and therefore to influence sex ratios and SSS at an early successional stage, making it difficult to find clear spatial patterns once these species reach maturity and can be sexed
How do soil nutrients affect within-plant patterns of herbivory in seedlings of Eucalyptus nitens?
Effect of Light Conditions on the Resistance of Current-year Fagus Crenata Seedlings Against Fungal Pathogens Causing Damping-off in a Natural Beech Forest: Fungus Isolation and Histological and Chemical Resistance
Behavioral plasticity of a grass-feeding caterpillar in response to spiny- or smooth-edged leaf blades
Genotypical and multiple phenotypical traits discriminate Salix × rubens Schrank clearly from its parent species
Quality control by leaf-cutting ants: evidence from communities of endophytic fungi in foraged and rejected vegetation
Individual and collective problem-solving in a foraging context in the leaf-cutting ant Atta colombica
SCOPUS: ar.jinfo:eu-repo/semantics/publishe