The relevance of inbreeding depression to the persistence of plant populations can depend upon whether stress magnifies inbreeding depression for fitness-related traits. To examine whether drought stress exacerbates inbreeding depression in gas exchange traits and biomass, we grew selfed and outcrossed progeny of inbred lines from two populations of Impatiens capensis in a greenhouse experiment...

In a greenhouse study we quantified the gradual change of gas exchange, water relations and root reserves of aspen (Populus tremuloides Michx.) seedlings growing over a 3-month period of severe water stress. The aim of the study was to quantify the complex interrelationship between growth, water and gas exchange, and root carbon (C) dynamics. Various growth, gas exchange and water relations var...

drought monitoring and evaluation in water resources systems, are basic steps in systems analysis aswell as the optimal water resources allocation for different demands. therefore, in this study, whole of irancountry was selected as the study area, and it was attempted to determine the simultaneous droughts whichhad been occurred in the period of 1981-2010, using monthly rainfall data of 31 syn...

South American seasonally dry tropical forests (SDTFs) are critically endangered, with only a small proportion of their original distribution remaining. This paper presents a 12 000 year reconstruction of climate change, fire and vegetation dynamics in the Bolivian Chiquitano SDTF, based upon pollen and charcoal analysis, to examine the resilience of this ecosystem to drought and fire. Our anal...

In this report, we summarize the current status of the Jollyville Plateau salamander (Eurycea tonkawae) drawing upon data gathered from two different survey methods, count surveys and capture-mark-recapture (CMR) surveys. We examined short term trends in count data from 2008-2010 in the context of the 2008-2009 drought at thirteen monitoring sites, and long term trends at eight of those sites f...

Drought affects the growth and productivity of vegetation, analysis drought resistance vegetation can help ecological environmental protection sustainable development in drought-prone areas. The Loess Plateau (LP) is a area China with an extremely fragile environment. This study analyzed across different climate regions biotypes, explored characteristics changes before after implementation Grai...

both poor germination and crop establishment due to water stress and salinity are among the most important limitations for production in semi-arid regions such as iran. to evaluate the response of four genotypes of triticale (et-82-15، et-82-8، et-79-17 and juanillo-92) to different water potentials caused by salinity and/or drought and recognizing the germination and seedling establishment, a ...

Repeated observations in the North Pacific subtropical gyre near Hawaii reveal pronounced freshening (--0.15 psu) and cooling (--0.5øC) of the upper thermocline from 1991 through 1997. The freshening appears progressively later on deeper isopycnals consistent with subduction of surface salinity anomalies at higher latitudes and subsequent southward advection. Winter rainfall anomalies in the ce...

We present here a series of sediment mass accumulation rate (MAR) for the Santa Barbara Basin, California. The 1117-1992 series was computed from varve thickness and water content to account for the compaction trend. Singular Spectrum Analysis (SSA) was employed to investigate multi-annual oscillations, as was previously done on varve thickness alone (Biondi et al. 1997). Singular spectrum anal...