Titre :	Plant response to multiple environmental stresses: implications for climatic change and biodiversity
Type de document :	texte imprimé
Auteurs :	Irwin N. Forseth, Auteur
Année de publication :	1996
Importance :	p 187-196
Langues :	Anglais (eng)
Catégories :	SCIENCES DE LA VIE
Mots-clés :	STRESS ENVIRONEMENTAL  BIODIVERSITE  CHANGEMENT CLIMATIQUE  REPONSE DE DEFENSE DES PLANTES
Résumé :	It is estimated that, about 25 000 of the 250 000 species of plants on earth are classified as extinct, endangered or vulnerable. Causes of part extinction and present endangerments encompass a variety of activities associated with the growing human population, including browsing and overgazing, land clearing for agriculture, deforestation, collection of aggressive species of plants. Documentation of the effects of deforestation or invasion of alien species has occurred, however the assessment of human-caused climatic changes on present and future plant biodiversity levels is a more difficult undertaking. Many of the projections about the future global climates come from general circulation models (GCMs). These models have variations and uncertainties in their projections and in their ability to model the Earth’s climate. However, they do provide plausible regional scenarios of climatic change that ecologists can use to examine community and ecosystem responses. All models show substantial changes in climate when CO2 is doubled. Most models project greater temperatur increases in midlatitude, temperate regions and in midcontinental regions, relative to overall global means. In addition, many of these models predict that changes in regional precipitation patterns occur, with decreases in midlatitude areas. These areas are currently major crop-producing regions of the world. A final prediction of many GCMs is that doubling CO2 concentrations in the atmosphere may lead to increased occurrences of extreme events, such as major storms, long droughts, severe cold spells or prolonged heat waves .Because of the vulnerability of small populations to extreme climatic events, these latter occurrences are of special concerns to ecologists who study biodiversity.
Numéro du document :	A/BIO
Niveau Bibliographique :	2
Bull1 (Theme principale) :	BIOLOGIE
Bull2 (Theme secondaire) :	BIOLOGIE GENERALE

Plant response to multiple environmental stresses: implications for climatic change and biodiversity [texte imprimé] / Irwin N. Forseth, Auteur . - 1996 . - p 187-196.
Langues : Anglais (eng)

Catégories :	SCIENCES DE LA VIE
Mots-clés :	STRESS ENVIRONEMENTAL  BIODIVERSITE  CHANGEMENT CLIMATIQUE  REPONSE DE DEFENSE DES PLANTES
Résumé :	It is estimated that, about 25 000 of the 250 000 species of plants on earth are classified as extinct, endangered or vulnerable. Causes of part extinction and present endangerments encompass a variety of activities associated with the growing human population, including browsing and overgazing, land clearing for agriculture, deforestation, collection of aggressive species of plants. Documentation of the effects of deforestation or invasion of alien species has occurred, however the assessment of human-caused climatic changes on present and future plant biodiversity levels is a more difficult undertaking. Many of the projections about the future global climates come from general circulation models (GCMs). These models have variations and uncertainties in their projections and in their ability to model the Earth’s climate. However, they do provide plausible regional scenarios of climatic change that ecologists can use to examine community and ecosystem responses. All models show substantial changes in climate when CO2 is doubled. Most models project greater temperatur increases in midlatitude, temperate regions and in midcontinental regions, relative to overall global means. In addition, many of these models predict that changes in regional precipitation patterns occur, with decreases in midlatitude areas. These areas are currently major crop-producing regions of the world. A final prediction of many GCMs is that doubling CO2 concentrations in the atmosphere may lead to increased occurrences of extreme events, such as major storms, long droughts, severe cold spells or prolonged heat waves .Because of the vulnerability of small populations to extreme climatic events, these latter occurrences are of special concerns to ecologists who study biodiversity.
Numéro du document :	A/BIO
Niveau Bibliographique :	2
Bull1 (Theme principale) :	BIOLOGIE
Bull2 (Theme secondaire) :	BIOLOGIE GENERALE