The Influence of Adaptive Foraging Decisions on Spatial Heterogeneity of Parasitism and Parasitoid Population Efficiency

Oikos ◽  
1993 ◽  
Vol 67 (2) ◽  
pp. 209 ◽  
Author(s):  
Gerard Driessen ◽  
Marcel E. Visser
Keyword(s):  
Spatial Heterogeneity ◽  
Foraging Decisions ◽  
Parasitoid Population ◽  
Adaptive Foraging

scholarly journals Honeybees adjust colour preferences in response to concurrent social information from conspecifics and heterospecifics

2019 ◽  
Author(s):  
José E Romero-González ◽  
Cwyn Solvi ◽  
Lars Chittka
Keyword(s):  
Bombus Terrestris ◽  
Social Information ◽  
Flower Colour ◽  
Social Cues ◽  
Floral Resources ◽  
Foraging Decisions ◽  
Flower Type ◽  
Colour Preferences ◽  
Adaptive Foraging ◽  
Natural Preference

AbstractBees efficiently learn asocial and social cues to optimise foraging from fluctuating floral resources. However, it remains unclear how bees respond to divergent sources of social information, and whether such social cues might modify bees’ natural preferences for non-social cues (e.g. flower colour), hence affecting foraging decisions. Here, we investigated honeybees’ (Apis mellifera) inspection and choices of unfamiliar flowers based on both natural colour preferences and simultaneous foraging information from conspecifics and heterospecifics. Individual honeybees’ preferences for flowers were recorded when the reward levels of a learned flower type had declined and novel-coloured flowers were available where they would find either no social information or one conspecific and one heterospecific (Bombus terrestris), each foraging from a different coloured flower (magenta or yellow). Honeybees showed a natural preference for magenta flowers. Honeybees modified their inspection of both types of flowers in response to conspecific and heterospecific social information. The presence of either demonstrator on the less-preferred yellow flower increased honeybees’ inspection of yellow flowers. Conspecific social information influenced observers’ foraging choices of yellow flowers, thus outweighing their original preference for magenta flowers. This effect was not elicited by heterospecific social information. Our results indicate that flower colour preferences of honeybees are rapidly adjusted in response to conspecific social information, which in turn is preferred over heterospecific information, possibly favouring the transmission of adaptive foraging information within species.

Soil Spatial Heterogeneity and Systems of Agriculture

2015 ◽  
Vol 2 (1) ◽  
pp. 50-59
Author(s):  
V. Medvedev
Keyword(s):  
Spatial Heterogeneity ◽  
Soil Cover ◽  
Regular Grid ◽  
Resource Saving ◽  
The Third ◽  
Soil Spatial Heterogeneity ◽  
Agriculture Systems ◽  
Zonal Soils

Aim. To consider soil continuality and discreteness as features of heterogeneity manifestation in a soil cover, important for construction of agriculture systems. Methods. Geostatistical research of soil spatial heterogeneity, revealing the contours of a fi eld with various parameters of fertility. Results. The use of principles of precise agriculture and inspection of indicative properties of fi eld soils using a regular grid allowed to divide a fi eld into contours with three levels of fertility: the fi rst one is characterized by optimal or close to optimum properties which allows refusing from (or reducing substantially) tillage, introduction of fertilizers or chemical ameliorates; the second one has average parameters of fertility corresponding to zonal soils and demands the application of zonal technologies; the third one (with the worst parameters of fertility) presupposes regular use of the improved technologies. Conclusions. The introduction of precise agriculture will allow replacing a traditional zonal system with thenew which is soil-protecting and resource-saving one.

Temporo-spatial heterogeneity of dominant fish species in the Jiaozhou Bay community

2017 ◽  
Vol 24 (5) ◽  
pp. 1091
Author(s):  
Jia WO ◽  
Binduo XU ◽  
Ying XUE ◽  
Yiping REN ◽  
Chongliang ZHANG
Keyword(s):  
Spatial Heterogeneity ◽  
Fish Species ◽  
Jiaozhou Bay ◽  
Dominant Fish
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