Ecological implications of xylem cavitation for several Pinaceae in the Pacific Northern USA

Piñol J., Sala A. (2000) Ecological implications of xylem cavitation for several Pinaceae in the Pacific Northern USA. Functional Ecology. 14: 538-545.
Enllaç
Doi: 10.1046/j.1365-2435.2000.00451.x

Resum:

1. Xylem hydraulic properties and vulnerability to cavitation (determined using the air-injection method) were studied in six Pinaceae of the northern Rocky Mountains: Pinus ponderosa, Pseudotsuga menziesii, Larix occidentalis, Pinus contorta, Pinus albicaulis and Abies lasiocarpa. We tested whether species extending into drier habitats exhibited increased resistance to water stress-induced cavitation, and whether there is a trade-off between xylem transport capacity and resistance to cavitation. 2. At lower elevations the more drought-tolerant P. ponderosa was much less resistant to cavitation than the codominant P. menziesii. Greater vulnerability to cavitation in P. ponderosa was compensated for, at least in part, by increased stomatal control of water loss (inferred from carbon isotope discrimination) and by increased sapwood to leaf area ratios. Similar differences, but less pronounced, were found in codominant species at higher elevations. 3. Leaf specific hydraulic conductivity was negatively correlated with mean cavitation pressure. When species were separated into pines and non-pines, sapwood specific conductivity and mean cavitation pressure were also negatively correlated within each of the two groups. 4. Our results indicate that within the evergreen conifers examined, greater resistance to water stress-induced cavitation is not required for survival in more xeric habitats, and that there is a trade-off between xylem conductance and resistance to cavitation.

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A semi-automatic methodology to detect fire scars in shrubs and evergreen forests with Landsat MSS time series

Salvador, R., Valeriano, J., Pons, X., Diaz-Delgado, R. (2000) A semi-automatic methodology to detect fire scars in shrubs and evergreen forests with Landsat MSS time series. International Journal of Remote Sensing. 21: 655-671.
Enllaç
Doi: 10.1080/014311600210498

Resum:

Modelling long-term effects of CO2 increase and climate change on European forests, with emphasis on ecosystem carbon budgets.

Mohren GMJ, Bartelink HH, Kramer K, Magnani F, Sabaté S, Loustau D (2000) Modelling long-term effects of CO2 increase and climate change on European forests, with emphasis on ecosystem carbon budgets. In Ceulemans RJM et al (eds) Forest ecosystem modelling, upscaling and remote sensing. SPB Academic Publishing, the Hague, pp. 179-192.

Transferred ants in the Iberian peninsula (Hymenoptera, Formicidae).

Espadaler X, Collingwood CA (2000) Transferred ants in the Iberian peninsula (Hymenoptera, Formicidae). Nouvelle Revue d'Entomologie 17:257-263.

Física i biologia en la dispersió de la lleteresa gran, Euphorbia characias L. (Euphorbiaceae).

Espadaler X, Gómez C (2000) Física i biologia en la dispersió de la lleteresa gran, Euphorbia characias L. (Euphorbiaceae). In Llimona F et al (eds) I Jornades sobre la recerca en els sistemes naturals de Collserola: aplicacions a la gestió del Parc. Parc de Collserola, Barcelona, pp. 65-69.

Les formigues del suro: cuavellats o rebaixins.

Espadaler X (2000) Les formigues del suro: cuavellats o rebaixins. Brots de Collserola 83:868-870.

Ant predation and the cost of egg carrying in the golden egg bug: experiments in the field.

Kaitala A, Espadaler X, Lehtonen R (2000) Ant predation and the cost of egg carrying in the golden egg bug: experiments in the field. Oikos 89:254-268.

Formica dusmeti Emery, 1909, an Iberian endemic ant species: description of the male and distribution (Hymenoptera: Formicidae).

Espadaler X, Gómez C (2000) Formica dusmeti Emery, 1909, an Iberian endemic ant species: description of the male and distribution (Hymenoptera: Formicidae). Annales Zoologici (Warszawa) 50:39-41.

Ants from the Montnegre-Corredor Natural Park (NE Spain) with description of the male Lasius cinereus Seifert (Hymenoptera, Formicidae).

Espadaler X, Roig X (2000) Ants from the Montnegre-Corredor Natural Park (NE Spain) with description of the male Lasius cinereus Seifert (Hymenoptera, Formicidae). Miscel·lània Zoològica 23:45-53.

Species body-size distribution and spatial scale in Iberian ants.

Gómez C, Espadaler X (2000) Species body-size distribution and spatial scale in Iberian ants. Vie et Milieu 50:289-295.

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