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Auteur Esperança Gacia i Passola |
Documents disponibles écrits par cet auteur (9)
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Effects of building up a dam in a shallow montain lake (Baciver, Central Pyrennees) / Enric Ballesteros (1998)
Titre : Effects of building up a dam in a shallow montain lake (Baciver, Central Pyrennees) Type de document : Tiré à part de revue Auteurs : Enric Ballesteros (1958-) ; Esperança Gacia i Passola Année de publication : 1998 Importance : 55-66 Langues : Anglais (eng) Catégories : [CBNPMP-Géographique] Baciver
[CBNPMP-Géographique] Pyrénées centrales
[CBNPMP-Géographique] Val d'Aran
[CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude
[CBNPMP-Thématique] Impact sur l'hydrologie fluviale et lacustre
[CBNPMP-Thématique] Lac d'altitudeMots-clés : Littorelletea Isoëtes Résumé : Efectos del represamiento de un lago somero de montaña (Baciver, Pirineos centrales). Se estudiaron los cambios en el agua, el sedimento y la estructura y dinámica de las poblaciones de macrófitos sumergidos después del represamiento de un lago de alta montaña de los Pirineos a finales del verano de 1990. Las variaciones más notables de las características físicas y químicas fueron: a) elevación de 5,5 m del nivel del litoral; b) disminución de la transmitancia de la luz en la columna de agua; c) depleción de oxígeno en las aguas profundas, junto a la reducción del pH y al aumento de la conductividad y de la concentración de cationes; d) aumento de la concentración de nitrógeno disuelto total (principalmente amonio) y de fósforo en la columna de agua, y e) aumento de los compuestos de N reducidos (nitrito y amonio) en el agua intersticial de la comunidad de Isoetes lacustris, ligada a una disminución del nitrato. Los cambios en las características químicas parecen estar relacionados con la descomposición de la materia orgánica aportada por los prados y matorrales subalpinos terrestres, así como por la vegetación sumergida del lago. Tanto el área ocupada por la vegetación sumergida como el número de especies de macrófitos experimentaron una importante reducción con el represamiento del lago Baciver. Todas las especies pequeñas, no dominantes (Eleocharis acicularis, Subularia aquatica e Isoetes setacea), desaparecieron a lo largo del verano de 1991. Sparganium angustifolium experimentó un proceso de degradación (baja densidad de pies, hojas cortas) en 1991 que condujo a su completa desaparición en la primavera de 1992. La fuerte atenuación del régimen de iluminación podría explicar dichas pérdidas. Los individuos de Isoetes lacustris que originalmente vivían por debajo de los 0,6 m de profundidad estaban completamente muertos en el verano de 1991, probablemente debido a la depleción invernal de oxígeno. Las únicas plantas de Isoetes que sobrevivieron (las que originalmente vivían por encima de los 0,6 m de profundidad y que después del represamiento se hallaban entre 5,8 y 6,1 m) aumentaron su longitud foliar como respuesta a la reducción de irradiancia disponible. Aunque el número de hojas producidas fue ligeramente menor en 1991 de lo que era antes del represamiento, la biomasa producida aumentó, pues las hojas eran más largas. Sin embargo, la pérdida de hojas fue muy grande, lo que produjo una reducción global de la población. A finales de la primavera de 1992, los Isoetes lacustris supervivientes tenían las hojas restantes muy dañadas, probablemente debido a la anoxia invernal, y no se produjo ninguna hoja nueva en el verano de 1992. Esto condujo a la desaparición total de la comunidad en el lago. Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=131057 Ballesteros, Enric (1958-), Gacia i Passola, Esperança 1998 Effects of building up a dam in a shallow montain lake (Baciver, Central Pyrennees). Oecologia aquatica, 11 : 55-66.Documents numériques
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Article (1998)Adobe Acrobat PDF Global assessment of aquatic Isoëtes species ecology / Mattia M. Azella in Freshwater Biology, 69 (10) (2024)
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Titre : Global assessment of aquatic Isoëtes species ecology Type de document : Imprimé Auteurs : Mattia M. Azella ; Alice Dalla Vecchia ; Thomas Abeli ; Janne Alahuhta ; Victor B. Amoroso ; Enric Ballesteros (1958-) ; Vincent Bertrin (1978-) ; Daniel F. Brunton ; Alexander A. Bobrov ; Cecilio Caldeira ; Simona Ceschin ; Elena V. Chemeris ; Martina Čtvrtlíková ; Mary de Winton ; Esperança Gacia i Passola ; Oleg G. Grishutkin ; Deborah Hofstra ; Daniella Ivanova ; Maria O. Ivanova ; Nikita K. Konotop ; Danelle M. Larson ; Sara Magrini ; Marit Mjelde ; Olga A. Mochalova ; Guilherme Oliveira ; Ole Pedersen ; Jovani B. de S. Pereira ; Cristina Ribaudo ; María Inmaculada Romero Buján ; Angelo Troía ; Yulia S. Vinogradova ; Polina A. Volvoska ; Daniel Basílio Zandonadi ; Nadezhda V. Zueva ; Rossano Bolpagni Année de publication : 2024 Article en page(s) : 1420-1437 Langues : Anglais (eng) Mots-clés : Isoetes echinospora Durieu, 1861 Isoetes lacustris L. Résumé : Isoëtes are iconic but understudied wetland plants, despite having suffered severe losses globally mainly because of alterations in their habitats. We therefore provide the first global ecological assessment of aquatic Isoëtes to identify their environmental requirements and to evaluate if taxonomically related species differ in their ecology.
The assessment resulted in an extensive new database on aquatic Isoëtes, ecological niche analyses, and descriptive species accounts. We compiled a global database that includes all known environmental data collected from 1935 to 2023 regarding aquatic Isoëtes. We then evaluated the environmental drivers of 16 species using 2,179 global records. Additionally, we used hypervolume analysis to quantify the ecological niches of the two species with the greatest number of records, finding significant differences and evidence that Isoëtes echinospora occupies a wider ecological niche than Isoëtes lacustris.
Fifty-nine species (30% of the c. 200 Isoëtes species known today) were categorised as aquatic and were mainly reported in the Americas and northern Europe. About 38% of the aquatic species are threatened with extinction or are endemic to a small region, according to the International Union for Conservation of Nature's Red List in 2023. Many species were determined to be sensitive to certain water physical and chemical factors, generally preferring oligotrophic conditions such as low total phosphorus, moderate total nitrogen, moderate to low pH, and low conductivity.
This analysis includes ecological data in the assessment of rare/threatened aquatic plants globally. This new database and the ecological analyses completed defined the ecological requirements of several species and identified knowledge gaps, which can aid management actions and future research.
This paper highlights ecological significance and environmental sensitivities of aquatic Isoëtes. The current level of knowledge is inadequate for a large proportion of known taxa. We affirm the extreme need to support global, collaborative initiatives on which to build future conservation strategies.
Lien pérenne : DOI : 10.1111/fwb.14316 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=153664
in Freshwater Biology > 69 (10) (2024) . - 1420-1437Azella, Mattia M., Dalla Vecchia, Alice, Abeli, Thomas, Alahuhta, Janne, Amoroso, Victor B., Ballesteros, Enric (1958-), Bertrin, Vincent (1978-), Brunton, Daniel F., Bobrov, Alexander A., Caldeira, Cecilio, Ceschin, Simona, Chemeris, Elena V., Čtvrtlíková, Martina, Winton, Mary de, Gacia i Passola, Esperança, Grishutkin, Oleg G., Hofstra, Deborah, Ivanova, Daniella, Ivanova, Maria O., Konotop, Nikita K., Larson, Danelle M., Magrini, Sara, Mjelde, Marit, Mochalova, Olga A., Oliveira, Guilherme, Pedersen, Ole, Pereira, Jovani B. de S., Ribaudo, Cristina, Romero Buján, María Inmaculada, Troía, Angelo, Vinogradova, Yulia S., Volvoska, Polina A., Zandonadi, Daniel Basílio, Zueva, Nadezhda V., Bolpagni, Rossano 2024 Global assessment of aquatic Isoëtes species ecology. Freshwater Biology, 69(10): 1420-1437.Documents numériques
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article (2024)URL
Titre : Limnology in the pyrenean lakes Type de document : Tiré à part de revue Auteurs : Jordi Catalán ; Enric Ballesteros (1958-) ; Lluis Camarero ; Marisol Felip ; Esperança Gacia i Passola Année de publication : 1992 Importance : 27-38 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Eaux douces Mots-clés : Isoëtes Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=134195 Catalán, Jordi, Ballesteros, Enric (1958-), Camarero, Lluis, Felip, Marisol, Gacia i Passola, Esperança 1992 Limnology in the pyrenean lakes. Limnética, 8 : 27-38.Documents numériques
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Article (1992)URL Non-native minnows threaten quillwort populations in high mountain shallow lakes / Esperança Gacia i Passola in Frontiers in plant sience, 9 (2018)
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Titre : Non-native minnows threaten quillwort populations in high mountain shallow lakes Type de document : Imprimé Auteurs : Esperança Gacia i Passola ; Teresa Buchaca ; Nayeli Bernal-Mendoza ; Ibor Sabás ; Enric Ballesteros (1958-) ; Marc Ventura Année de publication : 2018 Article en page(s) : 329 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude Résumé : Submersed aquatic plants are a key component of shallow, clear water lakes contributing to primary production and water quality. High mountain lakes are naturally fishless although invasive trout and most recently minnows have been introduced causing a major impact on fauna richness. The Pyrenean high mountain range has preserved soft-water oligotrophic boreal isoetids in their southern limit of distribution but the recent fish introduction is a potential factor of stress that needs to be addressed. We here work under the hypothesis that due to contrasting ecological features, trout will not be heavily affecting quillwort populations while minnows will have a stronger effect on zooplankton and zoobenthos that will promote algal growth and reduce light availability for the underwater meadows. Ten Pyrenean shallow lakes representative of three scenarios -fishless, with trout and with minnows-, were sampled for meadow structure, water column and benthic environment characterization in mid-summer 2015 and 2016. Quillwort biomass allocation (above vs. belowground), epiphytic load, and composition of the algal community (abundant cyanobacteria) differed in the presence of minnows. In trout lakes biomass allocation and epiphytic load were average and the algal community composed by chlorophytes and diatoms as in fishless lakes. Biomass ratio was close to thresholds of negative buoyancy in minnow lakes indicating that meadows were at risk of uprooting and consequent de-vegetation. Total and soluble carbohydrates were lower and the sporangia contained significantly less reserves to constrain growth and expansion in the presence of minnows. Lake scenarios were coupled to physicochemical differences with low light, high phosphorus and Chl-a (mesotrophia) in minnow lakes, while trout and fishless lakes remained oligotrophic. This is the first study assessing the impact of non-native fish on soft-water isoetids from mountain lakes and shows that minnows are a major threat to quillworts. The impaired light environment (from epiphytic algal overgrow and water column Chl-a) entails consequent regression (i.e., no recruitment) and de-vegetation (uprooting) of the meadows. Since soft-water oligotrophic mountain lakes are protected under the Habitats Directive, some action needs to be urgently implemented not only to preserve quillworts but to the overall ecological integrity of the lakes. Lien pérenne : DOI : 10.3389/fpls.2018.00329 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150972
in Frontiers in plant sience > 9 (2018) . - 329Gacia i Passola, Esperança, Buchaca, Teresa, Bernal-Mendoza, Nayeli, Sabás, Ibor, Ballesteros, Enric (1958-), Ventura, Marc 2018 Non-native minnows threaten quillwort populations in high mountain shallow lakes. Frontiers in plant sience, 9: 329.Documents numériques
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Article (2018)URL Paisatgistica i el functionament de les comunitats de macròfits dels estanys del Parc nacional d'Aigüestortes y estany de Sant Maurici / Esperança Gacia i Passola (2008)
Titre : Paisatgistica i el functionament de les comunitats de macròfits dels estanys del Parc nacional d'Aigüestortes y estany de Sant Maurici Type de document : Extrait d'ouvrage Auteurs : Esperança Gacia i Passola ; Ana Lumbreras ; Eglantine Chappuis ; Joan Riera ; Enric Ballesteros (1958-) Année de publication : 2008 Importance : p. 49-65 Langues : Catalan (cat) Catégories : [CBNPMP-Thématique] Eaux douces Mots-clés : Isoëtes Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=85680 Gacia i Passola, Esperança, Lumbreras, Ana, Chappuis, Eglantine, Riera, Joan, Ballesteros, Enric (1958-) 2008 Paisatgistica i el functionament de les comunitats de macròfits dels estanys del Parc nacional d'Aigüestortes y estany de Sant Maurici. In: La investigació al parc nacional d'Aigüestortes i estany de Saint Maurici : setenes jordanes sobre recerca al parc nacional d'Aigüestortes i estany de Saint Mauric, ajuntamente de la vall de Boí, Barruera, 26,26 i 27 d'octubre de 2006. : 49-65.PermalinkThe effect of increased water level on Isoetes lacustris L. in lake Baciver, Spain / Esperança Gacia i Passola (1996)
PermalinkThe effect of increased water level on Isoëtes lacustris L. in Lake Baciver, Spain / Esperança Gacia i Passola in Journal of Aquatic Plant Management, 34 (1996)
PermalinkUna nova associació de plantes aquàtiques als pirineus : el ranunculo eradicati-potametum alpini / Enric Ballesteros (1991)
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