Global amphibian declines: a problem in applied ecology

Article Abstract:

Global amphibian declines represent a problem in applied ecology. Causes are comples and local and include such things as ultraviolet radiation, habitat modification, disease, climate change, and interactions thereof. Hypotheses about population behavior mjust be evaluated opposite the right null hypotheses. Null hypotheses have been generated for behavior of amphibian populations using a model and used to test hypotheses about the behavior of 85 time series from the literature. It appears most amphibian populations should go down more often than up in numbers. Recruitment is very variable and adult mortality less so. More amphibian populations decreased than would be expected from the model.

Australia, World, Statistics, Habitat (Ecology), Ultraviolet radiation, Habitats, Salamanders, Amphibians, Animal populations, Conservation of natural resources, Natural resource conservation, Population genetics, Ecology

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Invasion of coastal marine communities in North America: apparent patterns, processes, and biases

Article Abstract:

Research on biological invasions within North American marine habitats reveals that the encroachment of non-indigenous species within coastal ecosystems has risen exponentially since the early 1800s. Other findings show that these invasions are primarily the result of shipping, and are typically composed of mollusks and crustaceans; invasions were also discovered to be more prevalent on the coast of the Pacific Ocean rather than the Atlantic, and the origins of invasive species correspond to trade patterns.

Biological invasions, Coastal ecology

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Shrub invasions of North American semiarid grasslands

Article Abstract:

An analysis is presented on factors encouraging the encroachment of woody and brushy plants on grassland areas in North America's semiarid regions. These factors include climatic changes due to global warming, and continuous, high-level grazing by livestock and other domestic animals.

Causes of, Grasslands, Grazing, Desertification, Arid regions

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