Ecological and agricultural productivity indices and their dynamics in a sub-humid/semi-arid region from central Mexico

Ortíz, Walter Ritter; Ostos, Ernesto Jáuregui; Ruíz, Sergio Guzmán; Betancourt, Alfonso Estrada; Nava, Hipólito Muñoz; Sánchez, Juan Suárez; Vargas, Ma. del Carmen Corona

doi:10.1016/j.jaridenv.2004.02.009

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…The total annual precipitation is of 745.8 mm, December is the driest month and August the wettest, with 7.3 and 135.2 mm, respectively; January presents the highest number of frosts. The winds blow from North to South during the majority of the year [17,26]. …”

Section: Methodsmentioning

confidence: 99%

“…Some studies on water quality have been carried out in Mexican reservoirs [10,13,14,15,16]. However, other reservoirs and their tributaries with ecological and economic importance have been poorly studied; with regard to the Atlanga Reservoir, this is the largest and most important of the 16 reservoirs located in the State of Tlaxcala, Mexico, and water from this reservoir is used mostly for supplying agricultural irrigation, mainly in the months of April to August, due to that precipitation in the state is low, with a annual mean of around 700 mm [17]. The Reservoir represents the most important part of Irrigation District 056, denominated Atoyac-Zahuapan.…”

Section: Introductionmentioning

confidence: 99%

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Water Quality of a Reservoir and Its Major Tributary Located in East-Central Mexico

Castilla-Hernández

Torres-Alvarado

Luis

et al. 2014

IJERPH

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A reservoir with ecological and economic importance and its major tributary, localized in east-central Mexico, were studied. The aim of this work was to know the physicochemical water characteristics of both water bodies and to contrast these by their different uses, and also estimate overall water quality using a Water Quality Index (WQI). Water samples from the reservoir and the tributary were obtained in different climatic seasons. In the tributary, anoxic and hypoxic conditions and high levels of organic matter, orthophosphate, and ammonium showed that this is strongly impacted by wastewater discharges and that the water is not suitable for different uses; independently of the season, the WQI showed “poor” quality (34.4–47.2). In contrast, in the reservoir a better water quality was determined; the WQI in the sampling months ranged from 72.1–76.6 (“good” quality), and spatially, this was from 66.5–79.5 (“fair” and “good” quality).

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water Quality of a Reservoir and Its Major Tributary Located in East-Central Mexico

Castilla-Hernández

Torres-Alvarado

Luis

et al. 2014

IJERPH

View full text Add to dashboard Cite

show abstract

“…The earth as a homeostatic system is a system that maintains its own state in an ever changing environment by way of internal adjustments. The behavior of the atmospheric system depends on internal and external constraints and its fundamental mechanisms are instability, feedbacks and homeostasis, whose principal manifestations are in their turn bifurcations toward a multiplicity of states [11][12][13][14][15][16]. Using time delay coordinates we can analyse data on one component of the multidimensional system, without knowing how all the other components behave.…”

Section: Introductionmentioning

confidence: 99%

An Integrated and Evolutionary Dynamical Systems View of Climate Complexity

Ortíz

Cruz²

2013

IJG

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The Earth shows a constant display of an organized complexity system, and its intrinsic capacity for sporadic self-organization constitutes its fundamental and profound mysterious property. A graphical method derived from the logistic phase space of precipitation is proposed to identify periods of abundance-scarcity of rain as well as El Niño presence in order to cope with climate change. The most striking result is that the majority of El Niño events on this graph are chaotic, in which the sign of the dominant eigenvalues of precipitation gives trends of scarcity on negative signs and abundance on positive signs, with eleven years periods.

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Nectar replenishment and pollen receipt interact in their effects on seed production of Penstemon roseus

Ornelas

Lara

2009

Oecologia

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Resource supply and pollen delivery are often thought to equally limit seed production in animal-pollinated plants. At equilibrium, plants should show no response to experimental pollen supplementation because resources limit seed set above the current level of pollen attraction, while experimental reduction in pollen deposition below the equilibrium level would reduce seed set. The predicted equilibrium may be disrupted, however, if plants expend additional energy to replenish removed nectar. We investigated the combined effects of nectar removal and pollen delivery on female reproductive success of Penstemon roseus (Plantaginaceae), a hummingbird-pollinated plant that replenishes removed nectar. We first documented that the frequency of experimental nectar removal was correlated with total nectar secretion; and increased frequency of nectar removal resulted in increased female reproductive costs to the plant. Trade-offs between investing resources in nectar and investing resources in seeds were then investigated in two contrasting natural populations by removing nectar from flowers at increasing frequencies while simultaneously hand-pollinating flowers with increasing amounts of pollen. Seed set was lowest at low levels of pollen deposition, highest at medium-sized pollen loads, and intermediate when pollen loads were highest. At both sites, the frequency of nectar removal and pollen deposition had an interactive effect on seed production, in that intermediate levels of nectar removal result in the absolute highest seed set, but only at intermediate pollen loads. At high pollen loads, seed set was higher following little to no nectar removal, and at low pollen loads, all rates of nectar removal affected fecundity equally. Seed mass responded to nectar removal and pollination differently than did seed set. High levels of nectar removal and pollen delivery both lowered seed mass, with little interaction between main effects. Our findings are among the first to demonstrate that nectar replenishment costs and pollination intensity jointly affect seed production. This conflict between nectar replenishment costs and pollen-limiting factors results in trade-offs between pollinator attraction and seed provisioning. Thus, resource allocation towards nectar production should more often be considered in future studies of pollen limitation.

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Ecological and agricultural productivity indices and their dynamics in a sub-humid/semi-arid region from central Mexico

Cited by 4 publications

References 21 publications

Water Quality of a Reservoir and Its Major Tributary Located in East-Central Mexico

Water Quality of a Reservoir and Its Major Tributary Located in East-Central Mexico

An Integrated and Evolutionary Dynamical Systems View of Climate Complexity

Nectar replenishment and pollen receipt interact in their effects on seed production of Penstemon roseus

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