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Freshwater Ecology and ConservationApproaches and Techniques$
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Jocelyne Hughes

Print publication date: 2018

Print ISBN-13: 9780198766384

Published to Oxford Scholarship Online: February 2019

DOI: 10.1093/oso/9780198766384.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2020. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 22 October 2020

Freshwater Populations, Interactions, and Networks

Freshwater Populations, Interactions, and Networks

(p.257) 12 Freshwater Populations, Interactions, and Networks
Freshwater Ecology and Conservation

David M. Harper

Nic Pacini

Oxford University Press

Freshwater ecosystems are never static and a species list alone hides that dynamism. Species come and go; populations wax and wane, so basic understanding of the numerical dynamics is necessary to separate ‘natural’ change from anthropogenic-induced change. Numerical changes in species or populations give clues, unravelling details of the changes. For example, quantifying life histories in changing populations or commonalities such as strategies in species changes is often necessary. Community characteristics, such as indices for vegetation or water quality, provide a different perspective on dynamics. Both population and community studies are now greatly assisted by environmental genetics, or eDNA. Ecosystems are made up of patches, as are landscapes, such that the patch dynamics often indicates much about the changing biological dynamics and networks. Energy to make ecosystems function is a small fraction of the solar energy that hits the earth; a far higher fraction is transformed by the vegetation of the ecosystem into latent heat of evaporation and is stored in water vapour. In its absence or reduction, that solar energy is transformed into heat, raising the temperature of the land and air.

Keywords:   species, populations, communities, ecosystems, landscapes, eDNA, energy flow, interactions, networks, solar energy dissipation

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