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Showing 1 to 20 of 977 for “"predation"”.
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Active Vision Strategies in Predation
Visual predation requires precise and accurate behaviour, for which many predators have evolved excellent visual skills. However, an animal's visual abilities are greatly affected by how it moves its eyes, known as active vision. Insects have immobile eyes but can direct their gaze by moving their …
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Flatworm Predation on Juvenile Freshwater Mussels
… experiments were performed to assess the predation rate of M. tuba on newly transformed juveniles of plain pocketbook mussel, Lampsilis cardium. Predation rate at 20°C in dishes without substrate was 0.26 mussels worm -¹·h-¹. Predation rate increased to 0.43 mussels worm -¹·h-¹ when a …
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Pandemonium: An essay on predation and modernity
Our modern world is driven by processes of abstraction. These processes have recently begun to generate criteria of industrial and organizational formation radically different from those to which we became accustomed to during the modernist era. And as we are not held in thrall so much anymore to …
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Predation of Ringed Salamander Larvae, Ambystoma Annulatum
Predation on larval Ambystoma annulatum was studied in 1991-1993. The following predators, which are normally present in the breeding ponds of A. annulatum during larval development, were studied : dragonfly nymphs (Anax and Tramea), waterbugs (Belostoma), backswimmers (Notonecta), and newts …
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Trollope's Palliser Novels: The Motif of Predation
Made available in DSpace on 2014-12-12T21:09:17Z (GMT). No. of bitstreams: 1 7524309.pdf: 11194738 bytes, checksum: 2c7cfb7fe188d1431cdf75cb529fc5d9 (MD5) Previous issue date: 1975
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Nest Predation by brown-headed cowbirds (Molothrus ater)
The reproductive success of parasites is entirely dependent on their ability to encounter suitable hosts. Obligate brood parasitic birds may increase host encounter rate, and consequently their reproductive output, if they cause unsuitable late-stage host nests to fail thereby stimulating the host …
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Aquatic insects versus fish: adaptations to fish predation
v češtině Tato bakalářská práce je rešerší dostupných zdrojů o adaptacích vodního hmyzu vůči rybí predaci během všech fází jejich vývoje. Vzhledem k tomu, že je vodní hmyz velká skupina často si nepodobných druhů, je vodní hmyz jako takový na úvod této práce představen, včetně prostředí, ve kterém …
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Crayfish Predation on Juvenile Freshwater Mussels (Bivalvia: Unionidae)
… including crayfish. This study examines predation by a native crayfish, Orconectes neglectus on juvenile mussels, Lampsilis siliquoidea. Crayfish preyed on mussels and preferred mussels to snails of similar size. Juvenile mussels buried in substrate were preyed upon and the presence or …
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Cape Town's cats: reassessing predation through kitty-cams
… but these studies may have underestimated predation because they failed to account for the proportion of prey not returned to participants’ homes. In this study I used kitty-cams in an attempt to provide a prey correction factor for urban cats in Cape Town, South Africa. I investigated …
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Investigating Predation in the Fossil Record: Modern Analogs
Predation is considered a powerful ecological force influencing community structure, diversity, and abundance. Paleoecology offers a unique perspective, allowing us to examine ecological processes such as predation over evolutionary timescales. The three studies summarized below include two case …
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Trophic Level Changes and Alewife Predation on Conesus Lake
Conesus Lake has gone through a series of changes within its trophic levels. Walleye have been declining in numbers since the early 1970's. The introduction of an obligate planktivore, the alewife, in the late 1970's resulted in a rapidly expanding planktivore population and poorer water quality. …
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Factors Influencing Predation on Ruffed Grouse in the Appalachians
Predation accounts for the majority of ruffed grouse mortality beyond the brooding period throughout grouse range. Most studies of ruffed grouse ecology have taken place in the central portion of the species range including the Great Lakes states and southern Canada where aspen (Populus …
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HUMAN PREDATION RISK AND ELK BEHAVIOR IN HETEROGENEOUS LANDSCAPES
… were to reduce population growth rate, crop depredation, and habituation to humans. However, little was known about the indirect effect hunting has on anti-predator behavior, movement, resource selection, and human-elk conflicts. We first investigated the indirect effects of hunting on elk …
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HUMAN PREDATION RISK AND ELK BEHAVIOR IN HETEROGENEOUS LANDSCAPES
… were to reduce population growth rate, crop depredation, and habituation to humans. However, little was known about the indirect effect hunting has on anti-predator behavior, movement, resource selection, and human-elk conflicts. We first investigated the indirect effects of hunting on elk …
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Size-structured competition and predation in red-eyed treefrog tadpoles
… A. callidryas tadpoles and then explore how predation affects these interactions. To determine the strength of inter-cohort competition, we manipulated the density and relative proportion of large and hatchling tadpoles in a response surface design and quantified growth. We then observed the …
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Predation Vulnerability and Trophic Interactions of Pallid Sturgeon Scaphirhynchus albus
… for recruitment dynamics of a species. Predation and starvation are the two primary mechanisms of mortality among age-0 fishes, and can play an important role in the recruitment dynamics of fishes with intensity regulated by behavioral (i.e., prey selectivity) and/or environmental …
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