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Trujillo A.G.,Autonomous University of Chihuahua | Trujillo A.G.,Autonomous University of Baja California Sur | Espinosa A.P.,Autonomous University of Zacatecas | Salgado S.Z.,UABCS.Carretera Al sur | And 6 more authors.
Interciencia | Year: 2016

Cowpea (V. Unguiculata (L.) Walp) is consumed as human food and animal feed in many countries; in Mexico it is also used as green manure to improve soils. The study was conducted in La Paz, Baja California Sur, Mexico to determine if there is an intraspecific competition in V. Unguiculata and its effect on productive characteristics of the crop under field conditions. Three treatments consisting in placing 1, 2 and 3 seeds every 25cm in rows 15m long separated by 70cm, with 5 replicates, were compared. The following variables were evaluated: stem diameter, stem length, number of leaves, number of pods, forage weight and number of secondary stems. A multivariate analysis of variance was performed to explore the correlation between these variables. The performance of the studied variables decreased (P>0.001) as plant density of seeds increased. It is concluded that V. Unguiculata u nder fi eld c onditions p resents i ntraspecific competition with regard to the variables studied here.

Trujillo A.G.,Autonomous University of Baja California Sur | Espinosa A.P.,UABCS | Villavicencio J.L.E.,UABCS
Interciencia | Year: 2011

The floristic component in Baja California Sur, México is vast and of importance in the activities of its inhabitants. Some plants have been used for food and ornamental purposes. As a result, bishop's weed (Ferocactus spp.) is now considered to be in danger of extinction. The objective of the present study was to evaluate Ferocactus spp. to determine its potential in seed production. Twenty five plants of different heights and diameters, of ∼5 years after having been transplanted, were selected. Height and diameter were measured. The fruits were counted and collected, and their fresh (FFW) and dry (DFW) weights were recorded. The seeds of each fruit (SPF) were counted, along with the total of seeds per plant (TSPP). The diameter was significantly correlated (P<0.001) with TSPP, FFW and DFW. The height was correlated with TSPP (P<0.001). Prediction equations were obtained based on the diameter and height of the plants to estimate the dependent variables, whose R2 variables fluctuated between 0.31 (P<0.002) and 0.45 (P<0.0001). It is concluded that the diameter can be used as a predictor in the equations set for green fruit weight, dry weight of the fruit and the number of seeds per fruit. The height of the plant can be used to predict the total number of seeds per plant.

Robinson N.M.,UABCS | Hansen G.I.,U.S. Environmental Protection Agency | Fernandez-Garcia C.,UABCS | Fernandez-Garcia C.,University of Costa Rica | Riosmena-Rodriguez R.,UABCS
Algae | Year: 2013

Lithothamnion muelleri is reported for the first time as one of the main components of rhodolith beds along the Eastern Pacific Ocean based on samples from Washington State (USA), Pacific Baja California (México), southern Nicaragua, and Costa Rica. Individual rhodoliths ranged from fruticose to lumpy in morphology, and bi-sporangial, tetrasporangial, and gametangial plants were similar to those described from Australia and Brazil. Our study revealed a surprisingly wide latitudinal distribution of this species along the American continent. Its documentation in the Eastern Pacific will facilitate a more accurate interpretation of the ecology, biology, and biogeography of rhodolith beds worldwide. © The Korean Society of Phycology.

Del Monte-Luna P.,National Polytechnic Institute of Mexico | Lluch-Cota S.E.,UABCS
Interciencia | Year: 2013

Marine ecosystems are already responding to climate change, with examples found in virtually all of the world's oceans. Although there is not a singular response of marine amniotes to climate change, individual observations indicate three kinds of interrelated responses of marine amniotes: distribution shifts (geographic ranges), phenological changes (timing of seasonal activities) and inter-specific interactions including competition between species and the predator-prey system dynamics. If global sea temperature increases in the future, the expected patterns are that tropical marine amniotes species will extend their ranges and temperate ones will move to higher latitudes; reproductive events will occur earlier and migratory timing will show delays; and the trophic breath of some organisms will progressively change, particularly in low trophic species. It is expected that strict polar and endemic species will be the most affected by climate change. However, confidence levels in that such patterns will be fulfilled are low, as they are not a univocal response to climate change. In this group, it is more likely that the detected effects on individual species be related to processes dependent upon climate variations, such as changes in habitat structure (sea ice) and food availability, either of natural or human origin.

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