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Showing 1 to 20 of 199 for “"aggregations"”.
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Physical controls on copepod aggregations in the Gulf of Maine
… plays in determining the distribution of dense aggregations of copepods. These aggregations are an important part of the marine ecosystem, especially for endangered North Atlantic right whales. Certain ocean processes may generate dense copepod aggregations, while others may destroy them; this …
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The spatial distribution of Antarctic krill (Euphausia superba Dana) aggregations
In nature, many biota exhibit recognisable spatial groupings, commonly termed "clumps" or "patches" (Hutchinson 1953; Diggle 1983; Wilson 1978). Attempts to devise measures of such aggregation are usually based on statistically determining the frequency distributions of selected organism parameters …
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Physical controls on copepod aggregations in the Gulf of Maine
… plays in determining the distribution of dense aggregations of copepods. These aggregations are an important part of the marine ecosystem, especially for endangered North Atlantic right whales. Certain ocean processes may generate dense copepod aggregations, while others may destroy them; this …
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The structure and dynamics of spawning aggregations of coral reef fish
… of the structure and dynamics of spawning aggregations of coral reef fish The specific aims are to identify and characterise: (1) the species of coral reef fishes that formed spawning aggregations, (2) the locations where spawning aggregations were formed, (3) the periodicity with which …
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Collection-Level Subject Access in Aggregations of Digital Collections: Metadata Application and Use
… for successful subject exploration. While aggregations of digital collections built in the United States and abroad generate collection-level metadata of various levels of granularity and richness, no research has yet focused on the role of collection-level metadata in user interaction with …
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An empirical and theoretical investigation of kleptoparasitic foraging behaviour in mixed-species aggregations of gulls (Laridae)
… kleptoparasitism in mixed-species foraging aggregations of gulls (Laridae). Kleptoparasitism, or food stealing, is a strategy used frequently by gulls. Gull populations are increasing in urban areas despite declining overall. Understanding the role of kleptoparasitism in aiding gulls to …
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Two Layers of Selfish-Herds in Spawning Aggregations of Chub (Nocomis Sp.) and its Nest Associates
… behavior within the mixed-species spawning aggregations hosted by bluehead chub (Nocomis leptocephalus). I hypothesized that the host benefits more directly from the aggregation it supports than previous research suggests – specifically, by using nest associates to decrease its own risk of …
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Analysis of the key issues in the provision of bulk electric grid services by distributed energy resource aggregations
… provision of bulk electric grid services by DER aggregations (DERAs), and attempt to modify the treatment of ESRs in its wholesale markets. As an aftermath of these decisions, FERC also issued a notice of proposed rulemaking (NOPR) to extend these decisions to all the organized wholesale …
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Predation Risk and Colony Structure in the Pea Aphid, Acyrthosiphon Pisum
<p>Many organisms live in transient or permanent aggregations to reduce individual predation risk. Hamilton's "Selfish Herd" theory states that an individual should assume a central position within a group to decrease individual predation risk relative to that of its neighbors (i.e., individuals …
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Modelling the Thermodynamics of Maggot Masses during Decomposition
… heat generation varied in different sized aggregations and, if so, did it influence larval development and behaviour. Various sized aggregations (50-2500 larvae) composed solely of Lucilia sericata (Meigen, 1826)(Diptera: Calliphoridae) larvae were reared in the laboratory at a constant …
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Factors Influencing Behavior of Overwintering Brown Marmorated Stink Bugs (Halyomorpha halys) in Human Dwellings
… found not to respond to the presence of dead aggregations from the previous years unless touch was possible, in which case aggregations were joined. Dead aggregations from the same year had a repellent effect. Presence of a single dead bug from the same year did not provide any survivorship …
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Seasonal and Mesoscale Variability in the Distribution of Antarctic Krill, <i>Euphausia superba</i>, West of the Antarctic Peninsula
… krill biomass and the number of aggregations, characterize the depth distribution of krill, and provide a quantitative description of the size, shape, and biomass of individual krill aggregations. The acoustic observations were coupled in time and space to environmental conditions …
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Nesting aggregation as a Determinant of Brood Parasitism in Mason Bees (Osmia spp.)
… larger numbers of parasites to areas with aggregations of nests. I conducted a field study in subalpine meadows at the Rocky Mountain Biological Laboratory in Colorado, USA, to assess whether mason bees suffer increased brood parasitism as the size of nesting aggregations increases. Mason …
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Modelling migration and aggregation: Applications in fisheries, environmental change, and evolution
… to be undertaken, with population-scale breeding aggregations forming via simple rules governing individual behaviour. The model is used to analyse the response of aggregated breeders to range expansion following environmental change. Despite relatively rapid individual movement, breeding …
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Colouration evo-devo: the developmental basis of intra-specific variation in cichlid pigmentation
… under sexual selection, egg-spots are dense aggregations of xanthophores and iridophores on haplochromine cichlid anal fins, exhibiting remarkable inter- and intra-specific variation. In a population of the generalist species Astatotilapia calliptera from the Lake Malawi/Nyasa radiation, …
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Assessment and adaptive management of Orange Roughy off Southern Africa
… Zealand and Australia. Orange roughy form dense aggregations, especially during the spawning season, from which catch rates may reach 50 tonnes per minute of trawling with the net on the seabed. Orange roughy have many features of a K-selected species: extreme longevity(> 100 years), slow growth …
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Scientific Acoustic Data from Commercial Fishing Vessels: Eastern Bering Sea Walleye Pollock (Theragra chalcogramma)
… and temporal attributes of winter EBS pollock aggregations are not well understood due to the inaccessibility of the area to research vessels during harsh winter months. With their high resolution and wide spatial and temporal range OAD provided an excellent data source for investigating …
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Phytoplankton in flow
… thin phytoplankton layers and microscale cell aggregations. First, we consider 'thin phytoplankton layers', important hotspots of ecological activity that are found meters beneath the ocean surface and contain cell concentrations up to two orders of magnitude above ambient. While current …
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Interactive Procedural Design Exploration for Modular Structures
… evaluating structures that are constructed as aggregations of modular units. Using modular units as a building system can be more efficient for construction and potentially high performing structurally. Most of modular structures today are built in simple stacks which clearly advantages …
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