The effect of nitrogen additions on oak foliage and herbivore communities at sites with high and low atmospheric pollution.
Environ Pollut
; 151(3): 434-42, 2008 Feb.
Article
en En
| MEDLINE
| ID: mdl-17574712
ABSTRACT
To evaluate plant and herbivore responses to nitrogen we conducted a fertilization study at a low and high pollution site in the mixed conifer forests surrounding Los Angeles, California. Contrary to expectations, discriminant function analysis of oak herbivore communities showed significant response to N fertilization when atmospheric deposition was high, but not when atmospheric deposition was low. We hypothesize that longer-term fertilization treatments are needed at the low pollution site before foliar N nutrition increases sufficiently to affect herbivore communities. At the high pollution site, fertilization was also associated with increased catkin production and higher densities of a byturid beetle that feeds on the catkins of oak. Leaf nitrogen and nitrate were significantly higher at the high pollution site compared to the low pollution site. Foliar nitrate concentrations were positively correlated with abundance of sucking insects, leafrollers and plutellids in all three years of the study.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Escarabajos
/
Ecosistema
/
Contaminantes Ambientales
/
Contaminación Ambiental
/
Fertilizantes
/
Nitrógeno
Aspecto:
Determinantes_sociais_saude
Límite:
Animals
País/Región como asunto:
America do norte
Idioma:
En
Revista:
Environ Pollut
Asunto de la revista:
SAUDE AMBIENTAL
Año:
2008
Tipo del documento:
Article
País de afiliación:
Estados Unidos