GLOSSARY

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TAXONOMY (Taxonomie)

Science of classification of living beings.

(Translated from Dictionnaire universel francophone. Hachette/Edicef. 1997.)

TOXICITY (Toxicité)

Property of a substance to poison a living organism, generally expressed as the ratio between the minimum dose capable of killing an animal and its total weight.

(Translated from Manuila, A. et al. Dictionnaire français de médecine et de biologie, Masson, Paris, 1981.)

TRACER (Traceur)

Substance, matter or product which, introduced into a water mass or moving organism, makes possible the study of movement or evolution.

(Translated from Glossaire de l'Association européenne pour la promotion de la pêche.)

TRANSECT (Transect)

A cross section of an area used as a sample unit for recording, mapping or studying the vegetation and its use. May be a series of plots, a belt or strip, or merely a line, depending on the purpose.

(Translation Bureau. Termium. Department of Public Works and Government Services Canada, 1999.)

TRANSITION ZONE (Zone de transition)

A zone of intergradation between ecological communities; the conditions for each of the adjacent communities become more adverse and there is often an intermingling of species.

(Translation Bureau. Termium. Department of Public Works and Government Services Canada, 1999.)

TREMATODE (Trématodes)

Class of acoelomate invertebrate of the phylum Platyhelminthes. A parasitic flatworm whose complex life cycle generally entails two or even three hosts.

(Translated from Ramade, F. Dictionnaire encyclopédique de l'écologie et des sciences de l'environnement. Édiscience international, Paris, 1993.)

TRIAZINE (Triazines)

Group of herbicides commonly used on field crops; the relatively high solubility and slower degradation time of this pesticide compared to others of this type give rise to a variety of problems of environmental toxicity.

(Translated from Ramade, F. Dictionnaire encyclopédique de l'écologie et des sciences de l'environnement. Édiscience international, Paris, 1993.)

TROPHIC (Trophique)

Pertaining to or functioning in nutrition.

(McGraw-Hill Dictionary of Scientific and Technical Terms. McGraw-Hill Inc., 1978.)

TROPHIC LEVEL (Niveau trophique)

Stage in the circulation of energy and matter in the food chain.

(Translated from Dictionnaire usuel de l’environnement et de l’écologie, Guy Le Prat édition, Paris, 1981.)

TURBIDITY (Turbidité)

Opacity of natural waters caused by suspended particulate matter, generally resulting from inputs of earth due to runoff in the emergent parts of a watershed, but also from the erosion of banks in a water course. In addition to these natural causes, turbidity is often a consequence of the discharge of polluted effluents into surface waters.

(Translated from Ramade, F. Dictionnaire encyclopédique de l'écologie et des sciences de l'environnement. Édiscience international, Paris, 1993.)

VITELLIN (Vitelline)

Major egg yolk proteins from egg-laying animals such as non-mammalian vertebrates, arthropods, and others. They are high-density lipoglycoproteins derived from circulating precursors, vitellogenin.

(MeSH, PubMed, National Library of Medecine, National Center for Biotechnology Information.)

VITELLOGENIN (Vitellogénine)

A blood-borne protein from which the substance of the yolk is made.

(The New Shorter Oxford English Dictionary, L. Brown [ed.]. Clarendon Press, Oxford, 1993.)