Concrete
发表于 2025-3-28 15:18:24
https://doi.org/10.1007/978-3-663-07204-1pe waterfowl populations. Abundance and species richness are linear (abundance) and power functions (species richness) of lake area or shorelength, according to waterfowl guild. The remaining variation can partly be explained by variables related to the available food (coarse fish yield for piscivor
figurine
发表于 2025-3-28 22:02:15
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acrophobia
发表于 2025-3-28 23:12:00
https://doi.org/10.1007/978-3-663-07204-1digestibility of different food items within a diet, it was possible to calculate the energy consumption of the bird community in eutrophic Lake Esrom. As the production of food items and energy flow in Lake Esrom have been well studied, it was possible to relate the bird community to the trophic we
缩短
发表于 2025-3-29 06:35:05
https://doi.org/10.1007/978-3-663-07204-1 in contaminant levels. To understand more fully contaminant loading outside the breeding season, we analysed the contents of 1298 freshly regurgitated pellets and 179 fresh faeces, collected in March and early April 1978–83, and between late December and late February 1990–91, from the vicinity of
airborne
发表于 2025-3-29 07:29:11
https://doi.org/10.1007/978-3-663-07204-1Common Loon (.) and only lakes ≥40 ha produce their young. Broods of Common Merganser (.) occurred in lakes > 25 ha and loon and merganser broods together occurred only in lakes ≥ 80 ha. The fish production in the lakes was estimated from the total phosphorus vs fish yield relationship obtained in s
补助
发表于 2025-3-29 13:07:12
https://doi.org/10.1007/978-3-663-07204-1ophic. Species diversity was higher in the hypertrophic area, primarily due to a higher number of Anatid species. Contents of crops, gizzards, and intestines were analysed in 321 of the 361 birds collected. Diet was similar in certain species (.) despite differences in the trophic state of their hab
帐单
发表于 2025-3-29 16:31:21
https://doi.org/10.1007/978-3-663-07204-1that of two similar > 25-year-old reservoirs (1130-ha Par Pond and 87-ha Pond B) at the same site. L-Lake was constructed in 1984–1985 and filled in late 1985. Approximately 25% of the shoreline of L-Lake was planted with lacustrine vegetation in early 1987 in an attempt to speed the establishment o
miscreant
发表于 2025-3-29 23:10:46
https://doi.org/10.1007/978-3-663-07204-1an a decade of phytoplankton blooms and sparse submerged vegetation. During the expansion of submerged plants the number of resting and breeding waterfowl increased. The increase was significant for herbivorous birds such as coot (. L.) and mute swan (. (Gmelin)), but also for omnivorous dabbling du
实施生效
发表于 2025-3-30 03:50:40
https://doi.org/10.1007/978-3-7091-4521-0 in other habitats and at other times of the year are less certain. This study establishes the long term and regional patterns of abundance at breeding and feeding localities, which might in turn be related to diet.
狂热语言
发表于 2025-3-30 06:27:38
https://doi.org/10.1007/978-3-7091-4521-0bodies ranged from 102.5 to 847.5 ha. Salinity varied seasonally being the lowest in July during the rainy season (1.0%o) and highest in February (35.8%0). The waters are hypertrophic with total phosphorus concentrations as high 900 mg m..