SCIENCE

Under : SCIENCE    Posted On :  08.08.2017 12:00 am    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Biodiversity loss is a symptom of environmental deterioration on a global scale. A growing number of scientists, traditionally occupied with the descr....

Under : SCIENCE    Posted On :  07.08.2017 07:15 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Since the industrial revolution of the late 1800s, atmospheric concentrations of “greenhouse gases” – mostly carbon dioxide, methane, chlorofl o....

Under : SCIENCE    Posted On :  07.08.2017 07:15 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Direct exploitation of fishes by humans is an obvious cause of fish population declines.....

Under : SCIENCE    Posted On :  07.08.2017 07:14 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Pollution enters aquatic systems as sediments or in the form of dissolved or suspended substances in runoff or precipitation, while attached to sedime....

Under : SCIENCE    Posted On :  07.08.2017 07:14 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Movement of species into new areas is a natural zoogeographic phenomenon. When such range extension occurs as a result of human actions, it is conside....

Under : SCIENCE    Posted On :  07.08.2017 07:13 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Human alteration of aquatic habitats is the most commonly cited cause of declines in fish populations. Habitats are altered via modification of bottom....

Under : SCIENCE    Posted On :  07.08.2017 07:07 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

The close of the 20th century witnessed a number of wellpublicized environmental problems of regional and international scale. ....

Under : SCIENCE    Posted On :  07.08.2017 07:05 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Designation of a fish species as threatened or endangered is a complicated process influenced by political as well as biological concerns.....

Under : SCIENCE    Posted On :  07.08.2017 07:04 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Population declines lead to species declines, local extirpation, and eventually to global extinction of a species. Extinction is a natural process, an....

Under : SCIENCE    Posted On :  07.08.2017 07:02 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Ecosystem ecology is concerned with biological interactions but also with the effects of physical and climatic factors on ecosystem components. ....

Under : SCIENCE    Posted On :  07.08.2017 07:01 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Fishes do not only move energy and nutrients around in aquatic ecosystems.....

Under : SCIENCE    Posted On :  07.08.2017 07:00 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Discussing top-down and bottom-up interactions can imply that linear food chains characterize many aquatic ecosystems.....

Under : SCIENCE    Posted On :  07.08.2017 07:00 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Fishes play an essential role in the processing, transformation, and movement of important nutrients in aquatic ecosystems (e.g., Vanni 2002). Phospho....

Under : SCIENCE    Posted On :  07.08.2017 06:59 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

The impact of fish predation on both plants and animals extends beyond the direct effects of reduction in biomass and shifts in species and size compo....

Under : SCIENCE    Posted On :  07.08.2017 06:58 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

The preceding discussions have focused on the effects that fishes as predators have on trophic levels lower in the food web of the community. ....

Under : SCIENCE    Posted On :  07.08.2017 06:58 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

The biomass (mass per unit area) of fishes or other animals in a habitat indicates something about the nature of the community.....

Under : SCIENCE    Posted On :  07.08.2017 06:57 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

Populations of benthic invertebrates in streams appear to be minimally influenced by predatory fishes, although results vary in different habitats .....

Under : SCIENCE    Posted On :  07.08.2017 06:56 pm    Author :  Gene S. Helfman, Bruce B. Collette, Douglas E. Facey, Brian W. Bowen

The influence that fishes have on invertebrate prey populations in fresh water differs according to habitat .....

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