Biological significance of dead biomass retention trait in Mediterranean Basin species: an analysis between different successional niches and regeneration strategies as functional groups

Standing dead biomass retention is considered one of the most relevant fuel structural traits to affect plant flammability. However, very little is known about the biological significance of this trait and its distribution between different functional groups. Our aim was to analyse how the proportion of dead biomass produced in Mediterranean species is related to the successional niche of species (early-, mid- and late-successional stages) and the regeneration strategy of species (seeders and resprouters). We evaluated biomass distribution by size classes and standing dead biomass retention in nine dominant species from the Mediterranean Basin in different development stages (5, 9, 14 and 26 years since the last fire). The results revealed significant differences in the standing dead biomass retention of species that presented a distinct successional niche or regeneration strategy. These differences were restricted to the oldest ages studied (>9 years). Tree and small tree resprouters, typical in late-successional stages, presented slight variations with age and a less marked trend to retain dead biomass, while seeder shrubs and dwarf shrubs, characteristic of early-successional stages, showed high dead biomass loads. Our results suggest that the species that tend to retain more dead branches are colonising species that may promote fire in early-successional stages.This research has been partially financed by programme FORESTERRA ERA-Net (Medwildfirelab, PCIN-2013-140-C04-03), PROMETEO II (Desestrés/2014/038) and the Spanish Ministry of Education (Resilience CGL 2011-30515-C02-02). CEAM is supported by the Generalitat Valenciana (Regional Valencian Government)

Environmental and anthropogenic drivers of coniferous species distribution in Mediterranean drylands from North West Algeria

Understanding the influence of environmental and anthropogenic factors on the distribution of species is essential for developing management in endangered ecosystems. We studied the current abundance and distribution patterns of vegetation along environmental and anthropogenic gradients in North West Algeria. We focused on the four dominant coniferous species (Pinus halepensis, Tetraclinis articulata, Juniperus oxycedrus and Juniperus phoenicea). We compiled inventories of species composition, together with 12 environmental variables in 177 sampling plots throughout the study area. Multivariate (detrended correspondence analysis) and univariate (Huisman–Olf–Fresco models) analyses were applied to predict the presence of coniferous species and to explore species-environment relationships with ecological and anthropogenic variables. We found that species segregated along environmental gradients, mainly altitude and related climatic variables (temperatures). Anthropogenic variables, like fire frequency and overgrazing, were secondary, but also significant. Juniperus phoenicea was located exclusively in coastal areas. Tetraclinis articulata had a wide distribution and was linked to coastal and inland areas, but did not arrive at more continental areas (colder and drier), where it was replaced with J. oxycedrus. P. halepensis displayed the widest distribution and was practically present throughout the study area, but its maximum abundance was in continental areas. These results indicate a possible shift of species’ potential distribution in future climatic change. Species like J. oxycedrus would be seriously threatened by niche narrowing, while Pinus halepensis and T. articulata could expand to a certain extent. Our results provide important inputs for optimizing the management plans of coniferous species by considering environmental factors key modulators of vegetation distribution.This work has been conducted as part of the Research Integrated Action Programme TASSILI ‘History of woody vegetation and associated biodiversity conservation in north west Algeria’ (2007, No. 07MDU703). Faouzia Ayache was supported through a MAEC-AECID grant from the Spanish Agency for International Cooperation and Development. V.M. Santana was supported by a ‘Beatriu de Pinós’ grant (2014BP-2014BPB00056) Generalitat de Cataluña and M.J. Baeza was supported by the SURVIVE-2 (CGL2015-69773-C2-2-P) project

Allometric equations to calculate living and dead fuel loads in Mediterranean species

Determining the structure and fuel load is key to know the flammability of vegetation in the Mediterranean Basin where forest fires are frequent. Determine which plant structural variable is best related to living and dead fuel to develop allometric equations in nine species in the Western Mediterranean Basin. In the east of the Iberian Peninsula (Valencia Province), we measured four structural variables (basal stem diameter, height, maximum diameter and perpendicular diameter) that were related, by means of allometric equations, to the living and dead fuel separated into different size classes. We also analyze fuel changes across developmental states of the studied species, and the vertical distribution of dead fuel. General equations that consider all development states can be used to determine living fuel. However to obtain dead fuel, we recommend using specific equations for each development state and fuel fraction for better accuracy. The basal stem diameter was the best structural variable in almost all cases for estimating fuel in the studied species. Dead fuel load throughout species’ ontological development is a key factor to manage Mediterranean plant communities.Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This research was funded by the HYDROMED project funded by the Spanish Ministry of Science and Innovation (Subprojects BLUEWATER PID2019-111332RB-C21 and INERTIA PID2019-111332RB-C22), IMAGINA (PROMETEO/2019/110) and the FIRE-SCENARIO (GV-2020-160) projects funded by the Generalitat Valenciana

Thinning and plantation of resprouting species redirect overstocked pine stands towards more functional communities in the Mediterranean basin

Post-fire regeneration in Pinus halepensis' forests, one of the most abundant vegetation types in the Mediterranean basin, often generates overstocked and vulnerable stands. They accumulate a high fuel load, increasing the risk of further fires, and present high levels of vulnerability due to their reduced seed production. In addition, these dense stands substantially reduce the availability of light and nutrients, which may hinder the recruitment of other species, often generating mono-specific and homogeneous stands, which potentially supply fewer ecosystem services than mixed forests with more heterogeneous structures. In these dense pine stands, management is of high priority to reduce fire hazards and promote their functionality. In overstocked pine stands (>75,000 trees·ha−1), we assessed the long-term effects (10 years) of two thinning levels (600 and 1200 trees·ha−1), in combination with the plantation of Quercus faginea (a resprouter species typical of advanced successional stages in our study area) on 28 above and belowground ecosystem attributes, including fire hazard. After ten years, thinning and plantation interacted to enhance ecosystem attributes associated with disturbance regulation and biodiversity conservation (up to 200%) and food production (up to 90%), while no effects were observed on those attributes related to carbon sequestration and supporting services. These effects were mainly driven by aboveground attributes, as they responded more strongly to our treatments than those belowground. Our results are relevant for the restoration of Mediterranean degraded ecosystems, and show that tree thinning in overstocked pine stands, combined with the plantation of resprouter species, may not only reduce fire risks and accelerate post-fire succession but also enhance the supply of multiple ecosystem services in the long run.This research was funded by the FUME project funded by the European Seventh Programme Framework (Grant number 24388), HYDROMED project funded by the Spanish Ministry of Science and Innovation (Subprojects BLUEWATER PID2019-111332RB-C21 and INERTIA PID2019-111332RB-C22), IMAGINA (PROMETEO/2019/110), and the FIRE-SCENARIO (GV-2020-160) projects funded by the Generalitat Valenciana. A.M. is supported by the scholarship of Generalitat Valenciana-European Social Fund (ACIF-2018-194). S.S. was supported by the Spanish Government under a Ramón y Cajal contract (RYC-2016-20604)

Disturbance as a factor in breaking dormancy and enhancing invasiveness of African grasses in a Neotropical Savanna

The Cerrado is threatened by wildfires and invasive species. We aimed to evaluate in laboratory conditions whether temperature fluctuation at the soil surface, resulting from the absence of vegetation due to fire, can affect the germination of Urochloa decumbens and U. brizantha, two invasive African grasses. Seeds of both species were submitted to simulations: 1) temperature during fire at 1cm belowground (F); 2) temperature fluctuation at 1cm belowground without vegetation cover for a month (TF); 3) (F) + (TF); 4) control at 25ºC. After treatments, seeds were put to germinate at 25ºC for 40 days. We had four replicates per treatment and three temporal replicates. We compared germination percentage and the mean germination time among treatments using ANOVA. The treatments TF and F+TF had the highest germination values for both species. The results showed that fire per se could not stimulate seed germination, however, they suggest that a disturbance that produces a pattern of temperature fluctuation is able to break dormancy and enhance seed germination and, consequently, increase the invasiveness of the study species. Vegetation gaps resulting from disturbance may become new sites of invasion. This information is important for making management decisions regarding the control of these species.We thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES/DGU 227/2010) for financial support. M.J.B. acknowledges the support from the programme FORESTERRA ERA-Net (Medwildfirelab, PCIN-2013-140-C04-03) and PROMETEO II (Desestres es/2014/038)

Post-fire Regeneration Traits of Understorey Shrub Species Modulate Successional Responses to High Severity Fire in Mediterranean Pine Forests

Recurrent fires can impede the spontaneous recruitment capacity of pine forests. Empirical studies have suggested that this can lead to a prolonged replacement of pine forest by shrubland, especially if shrub species are pyrophytic. Model-based studies, however, have suggested that post-fire succession of pine forest under current climatic conditions will eventually tend towards the dominance of oaks under high fire severity and recurrence. These previous modelling studies did not address the role of the various post-fire regeneration traits of the understory shrub species. Considering the dichotomy of obligate seeder vs. resprouter species, either obligate or facultative resprouter, we hypothesized that when the shrubs present are post-fire seeders, the oaks steadily occupy the forest, whereas resprouter shrub species might compete with oaks and delay or arrest post-fire succession. To test this hypothesis, we developed a dynamic, cellular automaton model for simulating post-fire successional transitions in pine forests, including shrubs, pines and oaks, and stochastic fires of regular frequency. Our results showed a strong tendency towards oak dominance as final model state and a very reduced role of fire recurrence in this final state, with low yearly acorn input delaying oak dominance. Most relevantly, and in line with our hypothesis, the trend towards oak dominance depended markedly on the two types of shrub species, being delayed by resprouter species, which extended the shrub-dominated succession stage for several centuries. Our simulation results supported the view that the type of understorey species should be a key consideration in post-fire restoration strategies aiming to enhance fire resilience.This research has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under the grant agreement no. 283068 (CASCADE project). Thanks are due to FCT/MCTES for the financial support to CESAM (UIDP/50017/2020+UIDB/50017/2020), through national funds and the post-doctoral research contract of Jacob Keizer (FCT-IF/01465/2015), and to the Spanish Ministry of Science and Innovation for financial support (CGL2017-89804-R) of the work of Susana Bautista. The work of Paula Maia was partially supported by the project SuSPiRe (PTDC/ASP-SIL/30983/2017) funded by FCT, through COMPETE2020—Programa Operacional Competitividade e Internacionalização (POCI)

Seguimiento del Grado en Geología (Facultad de Ciencias, Universidad de Alicante, curso 2015-16)

La Facultad de Ciencias de la Universidad de Alicante ha constituido una red de trabajo formada por los profesores coordinadores de semestre del Grado en Geología, así como por los coordinadores responsables de la titulación. Los objetivos de esta red son: Asegurar la ejecución efectiva de las enseñanzas conforme al contenido del plan de estudios del título verificado; detectar posibles deficiencias en su implementación, proponiendo recomendaciones y sugerencias de mejora; y evidenciar los progresos en el desarrollo del Sistema de Garantía Interno de Calidad (SGIC) tanto en lo relativo a la revisión de la aplicación del plan de estudios como a la propuesta de acciones para mejorar su diseño en la implantación. El método de trabajo se basa en reuniones en las que los miembros de la red plantearán y debatirán los parámetros e indicadores de seguimiento de la red. Cada coordinador llevará a cabo una investigación individualizada del semestre del que es responsable en coordinación con los miembros de su comisión. Asimismo, se participará en la elaboración de los informes de autoevaluación del título

Increased aridity drives post‐fire recovery of Mediterranean forests towards open shrublands

Recent observations suggest that repeated fires could drive Mediterranean forests to shrublands, hosting flammable vegetation that regrows quickly after fire. This feedback supposedly favours shrubland persistence and may be strengthened in the future by predicted increased aridity. An assessment was made of how fires and aridity in combination modulated the dynamics of Mediterranean ecosystems and whether the feedback could be strong enough to maintain shrubland as an alternative stable state to forest. A model was developed for vegetation dynamics, including stochastic fires and different plant fire‐responses. Parameters were calibrated using observational data from a period up to 100 yr ago, from 77 sites with and without fires in Southeast Spain and Southern France. The forest state was resilient to the separate impact of fires and increased aridity. However, water stress could convert forests into open shrublands by hampering post‐fire recovery, with a possible tipping point at intermediate aridity. Projected increases in aridity may reduce the resilience of Mediterranean forests against fires and drive post‐fire ecosystem dynamics toward open shrubland. The main effect of increased aridity is the limitation of post‐fire recovery. Including plant fire‐responses is thus fundamental when modelling the fate of Mediterranean‐type vegetation under climate‐change scenarios

La participació d’estudiants en projectes d’investigació. Exemples dins l’ecologia i restauració forestal

Un component, no només un complement, de la docència és la posada en pràctica, en institucions externes a l’àmbit estrictament docent, dels coneixements adquirits. Un exemple són les pràctiques en empreses i altres activitats que incrementen el currículum acadèmic. L’alumne guanya experiència i coneixements que difícilment podria obtenir a l’aula o al laboratori. Així mateix, l’empresa obté col·laboració de persones preparades i sovint interessades. Beneficiaris de la col·laboració d’alumnes son els instituts d’investigació. L’alumne veu a la pràctica la importància de conceptes expressats pel personal docent (per exemple disseny experimental, presa, anàlisi i presentació de dades, etc.), les satisfaccions, i també les dificultats a l’hora de fer un treball estricte. L’institut d’investigació obté un ajut sovint imprescindible per dur a terme projectes d’I+D+i. Aquest treball analitza la col·laboració d’alumnes en projectes d’investigació dins del programa forestal de la Fundació CEAM (www.ceam.es). Considera l’origen dels alumnes, les institucions i programes que faciliten la col·laboració, els projectes d’investigació beneficiats, i intenta valorar les millores personals i de currículum obtingudes per l’alumnat col·laborador

Seguimiento del Grado en Geología (Facultad de Ciencias, UA)

La red de trabajo formada por los profesores coordinadores de semestre y de titulación del Grado en Geología (Facultad de Ciencias, Universidad de Alicante) ha tenido como objetivos principales: afianzar la implementación de las enseñanzas conforme al contenido del plan de estudios del título verificado; elaborar planes de mejora para solventar las posibles deficiencias detectadas y colaborar con los instrumentos del Sistema de Garantía Interno de Calidad (SGIC) del centro en la elaboración de los informes de autoevaluación del título. El método de trabajo se basa en reuniones en las que los miembros de la red plantearán y debatirán los parámetros e indicadores de seguimiento de la red, en la que cada investigador (coordinador) aporta una investigación individualizada del semestre del que es responsable. Ante la inminente acreditación del título el próximo curso, buena parte de las tareas se han enfocado a colaborar en los informes de auto-evaluación del título y en los planes de mejora