Grazing represents one of the most common disturbances in drylands worldwide, affecting both ecosystem structure and functioning. Despite efforts to understand nature magnitude grazing effects on components processes, contrasting results continue arise. This is particularly remarkable for biological soil crust (BSC) communities (i.e., cyanobacteria, lichens, bryophytes), which play an important role dynamics. Here we evaluated simultaneously effect impact BSC (resistance) recovery after...

Facilitation by nurse plants is a common interaction in harsh environments and this positive plant–plant may promote vegetation recovery ecosystems affected human activities. Determining the relevance of process, however, requires assessing how influence establishment other species, as well proportion species regional pool that would benefit from presence human-disturbed areas. Further, since time-dependent community-level consequences facilitation are likely to vary among landscapes with...

Interest in invasive species has increased around the world over last several decades. In Mexico, studies on date as early 1939 and number of publications considerably recent However, to our knowledge, analysis information gaps research priorities is lacking. Therefore, it necessary identify knowledge order define future focus conservation efforts. We assessed current state biological invasions Mexico based existing literature. Our aim was which areas absent or insufficient should be...

El estado de Oaxaca es considerado como uno los hot spots mexicanos más importantes no solo por la enorme riqueza y biodiversidad que alberga, sino también, creciente transformación sus bosques selvas amenazan integridad permanencia estos ecosistemas tropicales. Los objetivos este trabajo fueron analizar cambios en cubierta vegetal el uso tierra dos municipios región costera del periodo 2000-2011, conocer causas modelizar escenarios futuros dichas transformaciones al 2025. estudio se basó...

Abstract An experiment was conducted in three wild grass species of Bouteloua genus to compare the effect application biosolids on accumulation heavy metals, biomass production, and nutrient uptake. Biosolids were applied at rates 0, 3.5, 7, 10.5 Mg ha−1 two different soil types collected from southern Chihuahuan Desert. The shoot B. gracilis (BOGR) scorpioides (BOSC) times greater than control while curtipendula (BOCU) 75% both soils. In BOGR, nitrogen phosphorus uptake 4–4.5 calcareous...

El perro llanero mexicano (Cynomys mexicanus) vive en una pequeña área (500-600 km2) del noreste de México. La especie está considerada peligro extinción debido principalmente a la fragmentación hábitat, al reciente desarrollo y expansión agrícola porción norte su limitada distribución geográfica invasión arbustos el sur distribución. En este trabajo estudiamos papel ecológico ecología los pastizales desierto Chihuahuense. Muchas colonias esta especie, particularmente parte más distribución,...

Se estudiaron características fisiológicas y morfológicas de plántulas especies leñosas (nodrizas) suculentas (protegidas), las cuales se distribuyen en un gradiente ambiental el Altiplano Mexicano. Del extremo mésico eligieron Acacia schaffneri, A. farnesiana Opuntia jaliscana y, del xérico escogieron Prosopis laevigata O. streptacantha . En experimento invernadero, 24 semanas edad fueron sometidas por 90 días a diferentes niveles radiación (alta = 2133 μmol m-2d-1, baja 66 m-2d-1), humedad...

Abstract The effect of different grazing intensities on the semiarid grasslands southern Chihuahuan Desert was studied using a fence-line contrast between moderately grazed cattle ranch, from which goats and sheep had been excluded for forty-five years, an ejido, heavily overgrazed at least last century. Each plant species density cover quantified in three distinctive microhabitats ranch adjacent common-use rangelands. results indicated that grass were important dynamics this rangeland....

To test the hypothesis that Mexican pinyons (Pinus cembroides) and Johannis pines (P. johannis) grow under different environmental conditions, flora associated with both species was sampled along two 20-m perpendicular transects at 40 sites. Patterns were analyzed two-way-indicator-species program, which yielded six groups dominating xeric sites mesic Other of corresponded to transition from We used canonical-correspondence analysis explore effect slope aspect on indirectly related them an...

The objective of the present study is to show a compilation information in tomato and hot sweet pepper grown under plastic mulching, combined with drip irrigation or microtunnels. Sweet mulching needs be irrigated preferably when soil moisture decreases 50 % if purpose increase unit area yield 18.05 t·ha-1 (39 %) as an average four water application methods. When flood-irrigating pepper, we suggest all nitrogen fertilizer before placing on field. use microtunnels excellent way repeal insects...

It has been said for a long time that mesquite reduces significantly cover and productivity of herbaceous vegetation in the range lands. Likewise there are evidences showing opposite. This controversy make us think this interaction is not fully understood. work evaluated effect on along gradient which from open to heavy dense stands. was found isolated arboreal mesquites reduced up 50% photosyntetic photon flux density limiting C4, species, whereas clustered shrubby 75 % can limit growth...

Background: Corn is the most important crop in Mexico, but it can be affected by climate change. Small farmers from arid and semiarid ecosystems mainly use rainfed native landraces with short productive cycles (less than 90 days), which are adapted to elevated temperatures intense drought. Among these we find Norther Conical corn. Hypothesis: As Northern seems agroecosystems, hypothesize that this corn landrace tolerate mid-century change conditions. Studied species: Zea mays subsp....