Browsing by Subject "Precipitation"

Now showing 1 - 3 of 3
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    Señales de cambio climático en la provincia de Santa Fe : tendencias del período 1960-2019.
    (Universidad de Murcia, Servicio de Publicaciones., 2024) Toffoli, G. D.; Acetta, P. M.; Mendez, L. A.; Costamagna, D.; Leva, P. E.
    During the last decades, an increase in extreme weather events, precipitation and warm nights has been observed, while a decrease in cold nights and days with frost has been recorded in the central region of Argentina. The objective of this study is to evaluate the climate change indices derived from temperature and precipitation of greatest relevance to the province of Santa Fe (Argentina), based on the methodologies and indices proposed by the team of experts in detection, monitoring and indices of climate change. Daily data from six locations in the province of Santa Fe were used in the period evaluated (1960-2019). Positive annual trends were found in the number of warm and tropical nights, minimum daily temperature, days with heavier rain, and amount of annual precipitation; On the other hand, negative trends were manifested in the number of days with frost and in the daily thermal amplitude. The results found are consistent with numerous works related to the study of climate change in recent decades in multiple stations located in South America and central Argentina.
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    Small ponds support high terrestrial bird species richness in a Mediterranean semiarid region
    (2021-03-08) Zamora Marín, Jose´ M.; Zamora López, Antonio; Calvo, Jose´ F.; Oliva Paterna, Francisco J.; Jiménez Franco, María Victoria; Ecología e Hidrología
    Ponds are among the world’s most endan gered freshwater ecosystems. A comprehensive knowledge of pond biodiversity is urgently required to inform effective pond management and conserva tion actions. Most studies about pond biodiversity focus on aquatic taxa, while the terrestrial biodiver sity, especially of birds, has been little studied. Moreover, the few studies existing on pond biodiver sity do not account for different detection rates of species, thus yielding biased results. Here, we apply a hierarchical Bayesian modelling technique to data obtained from visual censuses to estimate bird species richness associated with small ponds in a semiarid region, considering the imperfect detection of species. The model incorporates specific responses to site characteristics (pond typology), landscape (environ mental heterogeneity) and at regional scale (mean annual precipitation). The studied ponds were used by two thirds of the terrestrial breeding bird community of the study region. Our modelling approach increased by an average of 7.5 species the observed site-specific richness. Drinking troughs supported a greater rich ness than other pond types. Environmental hetero geneity was positively related with species richness, whereas no clear relation was observed between richness and precipitation. In addition to ecosystem services provided by ponds to human welfare, our results suggest these small isolated habitats may act as key landscape elements for terrestrial birds in semiarid regions.
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    The crop of desert truffle depends on agroclimatic parameters during two key annual periods
    (Springer, 2019-11-09) Andrino, Alberto; Navarro-Ródenas, Alfonso; Marqués Gálvez, José Eduardo; Morte Gómez, María Asunción; Biología Vegetal
    Desert truffles have become an alternative agricultural crop in semiarid areas of the Iberian Peninsula due to their much appreciated edible value and their low water requirements for cultivation. Although most studies related to desert truffle production point to the sole importance of precipitation, this work is the first systematic study carried out to characterize whether other important agroclimatic parameters, for example reference evapotranspiration, soil water potential, relative air humidity %, aridity index or air vapour pressure deficit, may have an impact on a desert truffle production in an orchard with mycorrhizal plants of Helianthemum almeriense × Terfezia claveryi for 15 years from the plantation. The results show for the first time that T. claveryi production has two key periods, during its annual cycle: autumn (September to October) and spring (end of March). The aridity index and soil water potential seem to be the most manageable parameters in the field and can be easily controlled by applying irrigation during the abovementioned periods. Agroclimatic parameters can influence the final crop a long time before the desert truffle fruiting season contrary to what happens with other edible mycorrhizal mushrooms. Four different models to manage desert truffle plantations are proposed based on these agroclimatic parameters in order to optimize and stabilize carpophore fructifications over the years.