搜索结果: 1-10 共查到“海洋科学 Top-down”相关记录10条 . 查询时间(0.078 秒)
Top-down and bottom-up influences of jellyfish on primary productivity and planktonic assemblages
Top-down and bottom-up jellyfish on primary productivity planktonic assemblages
2014/4/17
A manipulative mesocosm experiment was done in a saline coastal lake in Australia to compare the top-down and bottom-up influences of jellyfish on primary production and planktonic assemblages. We hyp...
A century of bottom-up- and top-down-driven changes on a lake planktonic food web: A paleoecological and paleoisotopic study of Lake Annecy, France
Annecy France bottom-up- and top-down-driven changes
2014/4/16
We reconstructed the changes in the planktonic food web of an oligotrophic subalpine lake over the past
century, combining paleoecological methods and historical monitoring data. Analyses of organic ...
No empirical evidence for community-wide top-down control of prey fish density and size by fish predators in lakes
No empirical evidence community-wide top-down control prey fish density size by fish predators in lakes
2014/4/16
I tested relationships between fish predator and prey densities or size across 66 lakes of the European temperate zone, covering mean depths between 1 and 22 m and a phytoplankton biomass range betwee...
Microzooplankton grazing in the coastal Gulf of Alaska: Variations in top-down control of phytoplankton
Microzooplankton grazing coastal Gulf of Alaska Variations top-down contro phytoplankton
2014/4/22
Microzooplankton grazing rates on three phytoplankton size fractions (<5, 5-20, and >20 μm) were measured during spring and summer 2001 in the northern coastal Gulf of Alaska (CGOA). To a first approx...
Top-down and bottom-up controls on sediment organic matter composition in an experimental seagrass ecosystem
Top-down bottom-up controls sediment organic matter composition an experimental seagrass ecosystem
2014/4/21
We tested the singular and interactive effects of resource availability (light) and community composition (food chain length and herbivore species richness) on eelgrass (Zostera marina) ecosystem prop...
Top-down and bottom-up controls on periphyton biomass and productivity in Lake Tanganyika
Top-down and bottom-up controls periphyton biomass and productivity Lake Tanganyika
2014/5/4
We studied the effects of nutrient availability and grazers on periphyton in the littoral zone of Lake Tanganyika. Using a combination of dissolved nutrient ratios, nutrient diffusing substrates, and ...
Top-down control from the bottom: Regulation of eutrophication in a large river by benthic grazing
Regulation of eutrophication benthic grazing
2014/4/30
We use a 15-yr record from a 100-km stretch of the tidal, freshwater Hudson River to examine the controls of
phytoplankton biomass. Across years, seasonal mean chlorophyll a (Chl a) and maximum Chl a...
Selective predators and their parasitized prey: Are epidemics in zooplankton under top-down control?
Selective predators parasitized prey epidemics in zooplankton top-down control
2014/5/9
Seasonal change in the intensity of fish predation affects succession in lake zooplankton communities. Predation affects not only the zooplankton prey, but also their parasites. Because the ability of...
Top-down control of phytoplankton biomass and community structure in the monsoonal Arabian Sea
Top-down control phytoplankton biomass community structure monsoonal Arabian Sea
2014/5/26
During the 1995 monsoons, phytoplankton biomass was low over large areas of the Arabian Sea in spite of often high concentrations of inorganic nutrients, characteristics typical of high-nutrient, lowc...
Strong bottom-up and top-down control of early life stages of macroalgae
Strong bottom-up top-down control early life stages macroalgae
2014/6/9
In contrast to most pelagic primary producers, benthic macrophytes pass through morphologically distinct life stages, which can be subject to different ecological controls. Using factorial field exper...