Josep Antoni Conesa

• PhD on Biological Sciencies
• Managing Director at Universitat de Lleida Lleida Arboretum and Botanic Garden

The aim of the present study consists on the establishment of any relationship or interaction between geomorphological processes and vegetation/habitat distribution in an area with strong environmental gradients: an active saline lake in NE Spain. The resulting maps of the major geoforms and CORINE habitats within the lacustrine area were overlain...

Agricultural intensification in Europe during the past 30 years has led to changes in compositional and functional weed structure in agroecosystems as well as increases in the prominence of alien weeds. Irrigation is a major driver of agricultural intensification, particularly in semi-arid zones of the Mediter- ranean. In the past few decades, irri...

Abstract Agricultural landscapes represent mosaics of different habitats that can harbour high plant diversity where plant traits and trait syndromes can be used for predicting either plant responses to agricultural intensification or plant functional effects on other organisms. Understanding the spatial components of diversity within an agricultur...

Weed communities in irrigated orchards form spontaneous vegetative cover containing a remarkable presence of alien species. This plant cover can negatively affect the growth and productivity of orchards by reducing yield, but can also play a positive role by preventing soil erosion, increasing biodiversity and providing pollination services. Compos...

Agricultural intensification structures arable plant communities, including shifts in species assemblages and trait distributions, which affect the provision of ecosystem services. We used a response-effect trait framework to characterize the impact of agricultural intensification on two ecosystem services delivered by arable plants to pollinator a...

ABSTRACT. A checklist of the habitats of Community Interest under the Habitats directive 92/43/ CEE within Utxesa-Secà is presented. The description of each habitat includes a list of the most outstanding species and a list of the syntaxa that can be found in them. RESUM. Es presenta una llista detallada del conjunt d'hàbitats d'interès comunitari...

Desde la publicación en el año 2008 de la Check-list i Llista vermella de la flora d’Andorra, el Centre d’Estudis de la Neu i de la Muntanya d’Andorra (CENMA) ha ido realizando un seguimiento anual por ambientes de algunos de los taxones más amenazados a nivel nacional. Durante este estudio también se han recogido datos poblacionales y su estado de...

Floodplains and crops are particularly susceptible to alien plant invasion, often leading to negative ecologic and economic impacts. As irrigated crops and riparian habitats are interconnected at the landscape scale, plant species of each habitat may be susceptible to colonizing the other. In order to avoid alien plant invasions of natural habitats...

RESUMEN: Se actualiza el listado de la flora vascular de Andorra. Con la in-formación de publicaciones externas y trabajos propios del CENMA, se añaden 57 nue-vos taxones para el Principado a la checklist vigente desde 2008, siendo el total actual de 1.594 taxones. ABSTRACT: New taxa for the checklist of vascular plants of Andorra. We update the ch...

We update the checklist of vascular plants of Andorra. With external publications or own CENMA's studies, 57 new taxon have been added for the Principality of Andorra to the current checklist, published in 2008, being 1.594 taxon at present.

Due to the negative impact of the invasive alien plants on the ecosystems, and the higher susceptibility of riparian habitats to be invaded, it is important to know the current extent of the alien plant establishment in the local riparian habitats. Our study is focused on the oristic and functional description of the exotic ora present at the Segre...

Snowbed habitats are home to plant species that have adapted to particular environmental conditions (i.e. long-lasting snow cover and short growing seasons). The presence of most of these species is dependent on a long period of snow cover and so their conservation may well depend in the future on their ability to adapt to the effects of climate ch...

Es comenten les dades corològiques i ecològiques de quatre plantes presents al territori sicòric (Diplotaxis ilorcitana, Lappula patula, Trinia dufourii, Mantisalca duriaei) que són noves per a la flora catalana. Aquestes localitats representen l'extrem oriental de la seva àrea de distribució a la vall de l'Ebre. També es dóna notícia de la presènc...

Although the timing of snowmelt and growth temperatures appear to be the main factors that influence the species richness and phenology of snowbed plants, site-specific characteristics may also play a role in modifying the effects of the timing of snowmelt and temperature. In this study, the effects of site-specific factors (microtopography and sno...

Landscape complexity is thought to increase plant diversity in Mediterranean dryland cereal fields, although this assumption has not been tested specifically for rare arable plants (RAP). Standardized landscape metrics may help elucidate efforts to enhance RAP conservation. Our paper evaluates the impact of the surrounding landscape on the plant di...

Wetlands in semiarid regions have received less attention than wetlands in humid-temperate areas, and the limited amount of information has resulted in little regulatory recognition. A comprehensive map of the saline wetlands that occur in karstic depressions in the semiarid region of Monegros, NE Spain, was developed from historical data, topograp...

Un conjunt d' espècies de l' est d'Europa i Àsia van colonitzar la Península Ibèrica durant el miocè. Aquestes espècies són conegudes com plantes estèpiques. El nostre estudi mostra l' edat actual de les poblacions d'aquestes espècies estèpiques al Segrià (Lleida, Catalunya). També hem analitzat la presencia d'aquestes espècies al llarg de quatre e...

In addition to their impact on natural habitats, invasive alien plants can have a significant negative effect on agricultural systems and cause economic losses. Flood-irrigated orchards in the Mediterranean Basin are vulnerable to the invasion of alien weeds, primarily because of the traditional management practices used in the orchards, which are...

Royo-Esnal A, Torra J, Conesa JA & Recasens J (2012). Emergence and early growth of Galium aparine and Galium spurium. Weed Research. 52, 458–466. With the aim of improving the control of Galium aparine and G. spurium, field experiments were conducted in a Mediterranean winter cereal field. Emergence and early growth (in number of whorls) of six po...

Field experiments were conducted in a Mediterranean winter cereal field to examine emergence and early growth (in number of whorls) of nine accessions of Galium aparine, G. spurium and G. tricornutum. Accessions were sown in November 2005 and 2006 with four randomized complete blocks in western Catalonia. Emergence was determined by regular assessm...

Índice Presentación 13 1. Introducción 15 1.1. Humedales salinos de interior 17 1.2. El descubrimiento de una flora singular 18 1.3. En los albores de la fitosociología española 19 1.4. La exaltación de los valores botánicos 20 2. Rasgos generales del medio físico 23 2.1. La plataforma endorreica 25 2.2. Vales y depresiones 26 2.3. Fisonomía de las...

The aim of this paper is to validate the use of additive partitioning diversity models (species richness & Shannon index) and the mosaic landscape factors used in landscape ecology on the plant diversity present in the low-middle stretch of the Segre river. This model would be useful to evaluate the weight of exotic species within regional landscap...

Irrigated fruit tree orchards are environments rich in associated weed flora. Presence of water favours installation of exotic plants because these systems do not exhibit the characteristic summer drought of Mediterranean areas. Two different irrigation systems can be distinguished: traditional flood irrigation and modern drip irrigation. Moreover,...

Royo-Esnal A, Torra J, Conesa JA & Recasens J (2010). Characterisation of emergence of autumn and spring cohorts of Galium spp. in winter cereals. Weed Research 50, 572–585. The emergence of three artificial cohorts of Galium aparine, G. spurium and G. tricornutum with different accessions was studied over two years under the climatic conditions of...

Multiyear field data from Spain were used to model seedling emergence for three bedstraw species (Galium) that can coexist in winter cereal fields. The relationships between cumulative emergence and both growing degree days (GDD) and hydrothermal time (HTT) in soil were analyzed as sigmoid growth functions (Weibull). Iterations of base temperature...

Manuscrit rebut el novembre de 2009 Resum Es dóna a conèixer una nova localitat de Teucrium campanulatum al Segrià, que represen-ta una novetat per a la flora de Catalunya. S'ha elaborat un mapa de la distribució de l'espè-cie, a partir de material d'herbari i bibliografia, i se'n comenta també l'ecologia. Es discuteix sobre les figures de protecci...

An experimental work was conducted in Lleida (Spain) aiming to characterise the phenology and to quantify the demographic processes regulating the populations of Abutilon theophrasti Medicus in maize fields. Seedling emergence started a few days after crop sowing in early May and continued during two more months. The vegetative phase was very long...

An experimental work was conducted in Lleida (Spain) aiming to characterise the phenology and to quantify the demographic processes regulating the populations of Abutilon theophrasti Medicus in maize fields. Seedling emergence started a few days after crop sowing in early May and continued during two more months. The vegetative phase was very long...

La flora arvense al•lòctona present en els cultius de Catalunya consta de 79 espècies, de les quals gairebé un 76% provenen del continent americà i un 34% de diferents regions tropicals del món. Una gran majoria (77%) han estat introduïdes al llarg del segle XX. Els atributs més ben representats en aquestes espècies son: el seu cicle anual –prefere...

En aquest article es fa una descripció dels valors naturals presents al paratge conegut amb el nom de Coladors de Boldú-Montsuar, ubicat a la plana urgellenca, així com una proposta de redacció d'un Pla especial de protecció del medi natural i del paisatge que a manca d'altres figures normatives permetria garantir la conservació i tutela d'aquest e...

Las instrucciones para publicar en esta sección pueden verse en Anales Jard. Bot. Madrid 42(1): 231-232.1985. Los signos convencionales empleados son los siguientes: * Antes del nombre del taxon, para indicar nueva cita nacional. * Antes del nombre de la provincia, para indicar nueva cita provincial. + Antes del nombre del taxon, para indicar que n...

Resumen CONESA, J.A. (1996). Elementos florísticos de las sierras marginales de los Prepirineos centra-les catalanes. Anales Jard. Bot. Madrid 54:462-471. Las sierras marginales de los Prepirineos centrales catalanes están formadas por un conjunto de alineaciones de dirección oeste-este que se extienden desde el sur del Montsec hasta la depre-sión...

'Phytosociological characterization of Moricandia moricandioides (Boiss.) Heywood in the central and estern area of the Ebro basin' A new association, included in alliance Gypsophilion, occurring in the central and western area of the Ebro basin is described in this paper. This new association is called Moricandio moricandioidis-Rosmarinetum offici...

En aquest treball s'analitza i caracteritza la relació existent entre la vegetació i les diferents condicions climàtiques d' Aragó i Catalunya. S'han escollit i cartografiat vuit comunitats amb valor climàtic pertanyents a l'aliança Rosmarino-Ericion i s'han analitzat les seves pautes d'afinitat amb els factors bioclimàtics del territori. Es propos...