Biological conservation / British Ecological Society . vol. 212(A)Paru le : 01/08/2017 |
Exemplaires(0)
Disponibilité | ||
---|---|---|
aucun exemplaire |
Dépouillements
Ajouter le résultat dans votre panierEutrophication decreases salt marsh resilience through proliferation of algal mats / Kerstin Wasson in Biological conservation, vol. 212(A) (Août 2017)
[article]
Titre : Eutrophication decreases salt marsh resilience through proliferation of algal mats Type de document : texte imprimé Auteurs : Kerstin Wasson, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp. 1-11 Langues : Anglais (eng) Mots-clés : Eutrophication Nutrient loading Salt marsh Ulva Wrack Résumé : "Globally, many estuaries are affected by nutrient loading from human land uses in the surrounding watersheds. One consequence of increased nutrient levels is proliferation of opportunistic macroalgae. We sought to understand spatial and temporal dynamics of ephemeral macroalgal mats and to examine their effects on salt marsh in a eutrophic estuary in central California. A time series analysis spanning 80 years revealed that algal wrack has increased exponentially in frequency on the salt marsh, and was highly correlated with nutrient concentrations in the estuary, which have increased along with fertilizer use. Analysis of sediment δ¹⁵N showed a dramatic increase in nutrient loads attributable to agricultural fertilizer over the past 50 years. We monitored 15 salt marsh plots along the bank edge and detected a negative relationship between algal wrack cover and salt marsh cover, flowering, and canopy height. Moreover, algal wrack led to retreat of vegetation from the bank edge, and increased bank erosion. We also experimentally added algal wrack to salt marsh edge plots. Algal addition decreased salt marsh cover, flowering, and canopy height, and increased retreat rate. By integrating time series analyses, isotope data, algal and marsh monitoring and manipulative experiments, we have identified robust linkages between increased anthropogenic nutrient loading, increased algal wrack cover, reduction in marsh resilience and conversion of marsh habitat to mudflat through bank erosion. Decreasing nutrient inputs to eutrophic estuaries is thus essential for conservation and restoration of salt marshes and enhancing their resilience in the face of sea level rise." Type de publication : périodique Référence biblio : Wasson K., et al., 2017 - Eutrophication decreases salt marsh resilience through proliferation of algal mats. Biological conservation, 212(A) : 1-11. DOI : 10.1016/j.biocon.2017.05.019 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65900
in Biological conservation > vol. 212(A) (Août 2017) . - pp. 1-11[article]Exemplaires(0)
Disponibilité aucun exemplaire The epiphytic bryophyte community of Atlantic oak woodlands shows clear signs of recovery following the removal of invasive Rhododendron ponticum / Janet Maclean in Biological conservation, vol. 212(A) (Août 2017)
[article]
Titre : The epiphytic bryophyte community of Atlantic oak woodlands shows clear signs of recovery following the removal of invasive Rhododendron ponticum Type de document : texte imprimé Auteurs : Janet Maclean, Auteur ; Ruth Mitchell, Auteur ; David Burslem, Auteur ; Jeanette Hall, Auteur ; Robin Pakeman, Auteur ; David Genney, Auteur Année de publication : 2017 Article en page(s) : pp. 96-104 Langues : Anglais (eng) Résumé : "Increased awareness of the negative impacts of invasive non-native species has led to a rapid increase in clearance programs around the world. One of the main goals of clearance is the restoration of native communities that were present pre-invasion. Little monitoring is typically carried out, however, to verify that native communities return without further management intervention in the years following invasive species removal. We investigated whether the epiphytic plant community of Atlantic oak woodlands, which principally consists of bryophyte species, returned after up to thirty years of recovery following the removal of the invasive non-native shrub Rhododendron ponticum. This community is of international conservation value and is particularly threatened by invasive Rhododendron. We revealed that the epiphytic plant community was able to recover effectively in sites that had been clear from Rhododendron for over fifteen years. This recovery included several species of particular conservation interest with highly restricted European distributions (i.e. ‘Atlantic species’ such as Plagiochila heterophylla). Total cover and species richness both returned to similar or even higher levels to those found in uninvaded control plots by fifteen or more years following clearance, despite being highly reduced within dense Rhododendron thickets. Overall community composition also recovered to resemble uninvaded control plots in the years following Rhododendron removal. These findings present an encouraging message that at least some native communities can return naturally in the years following invasive species removal and may not require further management interventions to speed their return." Type de publication : périodique Référence biblio : Maclean J., Mitchell R., Burslem D., Hall J., Pakeman R., Genney D., 2017 - The epiphytic bryophyte community of Atlantic oak woodlands shows clear signs of recovery following the removal of invasive Rhododendron ponticum. Biological conservation, 212(A) : 96-104. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=65901
in Biological conservation > vol. 212(A) (Août 2017) . - pp. 96-104[article]Exemplaires(0)
Disponibilité aucun exemplaire