Prey of the Scavenger

Was Tyrannosaurus rex a predator or a scavenger?

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    • Freshwater Science 32 4: November 8, ; Accepted: Commonly referred to as keystone species, crayfish are ecologically important for their ability to transfer energy efficiently to higher trophic levels in aquatic food webs. They also are ecosystem engineers, modifying substrate and influencing distribution of other benthic invertebrates.

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    However, crayfish have yet to be examined as potential predators of benthic fish in lotic systems. Data obtained by sampling Illinois streams showed that increased crayfish density was correlated with decreased fish density, and this relationship was not influenced by habitat variables. The highest overall fish mortality occurred in the low-density crayfish treatment. We ran controlled tank experiments to seek formal evidence that crayfish are capable of killing and consuming benthic fish.

    Was Tyrannosaurus rex a predator or a scavenger? | HowStuffWorks

    Our study provides evidence that crayfish predation on benthic fish may have an influence on benthic fish populations, and this interaction could be of particular importance in streams with the invasive crayfish Orconectes rusticus. Sign Up for E-alerts. Alert me when this article is cited: Biotic interactions in freshwater benthic habitats.

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    Twenty-six key research questions in urban stream ecology: Chironomids as bioindicators of environmental quality in mountain springs. The urban stream syndrome: Functional trait niches of North American lotic insects: Stream restoration in urban catchments through redesigning stormwater systems: Stream ecosystem function in urbanizing landscapes.

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    In the prehistoric eras, the species Tyrannosaurus rex may have been an apex predator , preying upon hadrosaurs , ceratopsians , and possibly juvenile sauropods, [6] although some experts have suggested the dinosaur was primarily a scavenger. Recent distribution, population densities, and ecological requirements of the stone crayfish Austropotamobius torrentium in the Czech Republic. Was Tyrannosaurus rex a predator or a scavenger? Some species, however, are better suited for scavenging than others. Almost all scavengers above insect size are predators and will hunt if not enough carrion is available, as few ecosystems provide enough dead animals year-round to keep its scavengers fed on that alone. Flocks, Schools, and Prides.

    Examining a potential predator—prey relationship between crayfish and benthic fish in stream food webs. The Society for Freshwater Science Received: August 13, ; Published: Literature Cited Abrahamsson, S. Dynamics of an isolated population of the crayfish Astacus astacus Linne.

    Life history aspects of the Cherokee Darter, Etheostoma scotti Actinopterygii: Percidae as imperiled species in Northern Georgia. The fishes of Wisconsin. University of Wisconsin Press , Madison, Wisconsin.

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    *A scavenge is not predator nor prey. They eat the remains of dead animals. * The dissapearance of all members of a species. In everything from blockbuster movies to the imaginations of children, Tyrannosaurus rex is a bloodthirsty predator. It's fast and agile, able to chase down a Jeep.

    Habitat heterogeneity and activity of an omnivorous ecosystem engineer control stream community dynamics. Invading crayfish in a Michigan stream: Journal of the North American Benthological Society Feeding chronology and diet composition of two darters Percidae in the Iroquois River system, Illinois.

    Bird of Prey - Scavenger Scump

    American Midland Naturalist Direct and indirect effects of crayfish grazing in a stream community. Ecosystem engineering by crayfish in a headwater stream community. Evaluating the effects of trophic complexity on a keystone predator by disassembling a partial intraguild predation food web. Journal of Animal Ecology Are fish populations in temperate streams affected by crayfish? A field survey and prospects. Environmental Biology of Fishes Effects of a native crayfish Orconectes virilis on the reproductive success and nesting behavior of sunfish Lepomis spp.

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    Canadian Journal of Fisheries and Aquatic Sciences The role of omnivorous crayfish in littoral communities. Ecological role of predators.

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    From the side, a tyrannosaurid's jaws look like saw blades made from long, daggerlike teeth. The teeth themselves are serrated, too, ideal for cutting their way through meat. According to analysis of skull fossils, Tyrannosaurus could bite down with a force of , to , newtons 3, to 6, pounds per square foot [source: Other researchers used the damage from a T.

    Freshwater Science

    Its thigh bones were relatively long, a trait common in animals with good running endurance. Not all of the evidence for a predatory nature in T. Many of the prey species that lived at the time have elaborate body parts that can be interpreted as defense mechanisms. Triceratops , for example, has a bony frill protecting its neck in addition to the three horns for which it is named.

    Though there were other predators against which the frill would be useful as defense, T. But how does this evidence stack up to the other side of the coin -- the idea that T. Would those powerful legs really allow a massive dinosaur to move quickly enough to capture prey? And is there any evidence that tyrannosaurids hunted?