Effects of pollinator loss on endemic New Zealand mistletoes (Loranthaceae)

Article Abstract:

At two South Island New Zealand sites too few bird pollinators visit the flowers of two endemic mistletoes Peraxilla tetrapetala and P. colensoi (Loranthaceae) to get the fruit to fully set. At other sites pollination failure is suggested by data. Since 1840 the populations of the endemic mistletoes have declined considerably, a phenomenon thought to be the result of introduced herbivores. At the same time there has been a major decline in native bird densities and likely to conserve the mistletoe species will require maintaining native bird populations.

Environmental aspects, Birds, Biological diversity conservation, Biodiversity conservation, Plant conservation, Pollination, Mistletoe, Mistletoes

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Individual, population, community and ecosystem consequences of a fish invader in New Zealand streams

Article Abstract:

A series of coordinated studies in New Zealand streams describing the effect of an exotic fish on individual behavior, population, community, and ecosystem patterns is given. Invaders can have unexpected indirect effects in food webs. The trout invasion leads to strong top-down control of community structure and ecosystem functioning via its effects on individual behavior and population distribution.

Study and teaching, Population density, Ecosystems

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Evaluating genetic diversity associated with propagation-assisted restoration of American shad

Article Abstract:

Significant genetic differences between the American shad donor and recipient populations are revealed by microsatellite loci test. Data further indicate that high levels of genetic variance may result by their breeding behavior.

United States, Statistical Data Included, Analysis, Germplasm resources, American shad, Behavior genetics, Shad, Behavioral genetics, Fish migration

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