scholarly journals Componentes fenológicos del sistema de cruzamiento monoico de Cnidoscolus spinosus (Euphorbiaceae) en Jalisco

2017 ◽  
pp. 1
Author(s):  
Stephen H. Bullock
Keyword(s):  
Deciduous Forest ◽  
Tropical Deciduous Forest ◽  
Western Mexico ◽  
Mature Period ◽  
Individual Trees ◽  
Female Flowers

A hierarchy of phenological features defines the opportunities for breeding in a population of Cnidoscolus spinosus in a tropical deciduous forest in western Mexico. On any one tree, inflorescences develop in rough synchrony and all present flowers of both sexes. Only female flowers develop at the lowest ranks of ramification but only males develop later. Overlap of the mature period of flowers of both sexes is uncommon on one inflorescence of between inflorescences : individual trees are functionally female or male at any moment. lnter-tree synchrony may thus reduce successful breeding. Asynchrony is achieved in part by differences in the onset of flowering, but also by variance in the lenght of individual flowering cycles. The occurrence of two or three cycles per tree during one season for the population increases its breeding opportunities.

Coyote Habitat Use in a Tropical Deciduous Forest of Western Mexico

2006 ◽  
Vol 70 (1) ◽  
pp. 216-221 ◽  
Author(s):  
MIRCEA G. HIDALGO-MIHART ◽  
LISETTE CANTÚ-SALAZAR ◽  
CARLOS A. LÓPEZ-GONZÁLEZ ◽  
PATRICIA G. MARTÍNEZ-GUTÍERREZ ◽  
ERIN C. FERNANDEZ ◽  
...  
Keyword(s):  
Habitat Use ◽  
Deciduous Forest ◽  
Tropical Deciduous Forest ◽  
Western Mexico

Daily activity patterns of coyotes (Canis latrans) in a tropical deciduous forest of western Mexico

2009 ◽  
Vol 44 (2) ◽  
pp. 77-82 ◽  
Author(s):  
Mircea G. Hidalgo-Mihart ◽  
Lisette Cantú-Salazar ◽  
Samia E. Carrillo-Percastegui ◽  
Carlos A. López-González
Keyword(s):  
Daily Activity ◽  
Deciduous Forest ◽  
Canis Latrans ◽  
Activity Patterns ◽  
Tropical Deciduous Forest ◽  
Western Mexico ◽  
Daily Activity Patterns

Dry Season Habitat Use by Lizards in a Tropical Deciduous Forest of Western Mexico

2002 ◽  
Vol 36 (3) ◽  
pp. 487-490 ◽  
Author(s):  
C. M. Gienger ◽  
Daniel D. Beck ◽  
Nathan C. Sabari ◽  
Della L. Stumbaugh
Keyword(s):  
Habitat Use ◽  
Deciduous Forest ◽  
Dry Season ◽  
Tropical Deciduous Forest ◽  
Western Mexico

Distribution and annual net accumulation of above-ground dead phytomass and its influence on throughfall quality in a Mexican tropical deciduous forest ecosystem

2002 ◽  
Vol 18 (6) ◽  
pp. 821-834 ◽  
Author(s):  
J. Manuel Maass ◽  
Angelina Martínez-Yrízar ◽  
Cristina Patiño ◽  
José Sarukhán
Keyword(s):  
Dead Wood ◽  
Deciduous Forest ◽  
Elevation Gradient ◽  
Fine Fraction ◽  
Nutrient Flux ◽  
Tropical Deciduous Forest ◽  
Small Watershed ◽  
Western Mexico ◽  
Lower Plot ◽  
Standing Dead

The amount and annual net accumulation of above-ground dead woody material were quantified in a tropical deciduous forest in western Mexico. Three plots were located within a small watershed (16 ha) and distributed along a 150-m-elevation gradient (Upper, Middle and Lower plot). Total amount of above-ground dead phytomass (fine + coarse) was 27.2 Mg ha-1. Coarse dead category (branches + logs) made up 70.6% (19.2 Mg ha-1) of the total. The rest comprised the fine fraction, which was lying on the forest floor as surface litter. Of the total coarse dead woody mass, 70.8% was standing, hanging or still attached to live trees (13.6 Mg ha-1). Dead wood net accumulation was 6.6 Mg ha-1 y-1; 58% of this was coarse woody material and the rest comprised the fine litterfall fraction. The amount of standing, hanging/attached dead branches (2-20 cm circumference) varied significantly among plots, with the highest value in the Upper plot. Dead wood net accumulation was similar between the Upper and Middle plots, and significantly higher than the Lower plot. Compared to the intact canopy, the removal of dead mass (hanging/attached dead branches and standing dead logs) caused a significant decrease in throughfall nutrient concentration and nutrient flux by this pathway.

Net primary productivity of a tropical deciduous forest ecosystem in western Mexico

1996 ◽  
Vol 12 (1) ◽  
pp. 169-175 ◽  
Author(s):  
A. Martinez-Yrizar ◽  
J. M. Maass ◽  
L. A. Perez-Jimenez ◽  
J. Sarukhan
Keyword(s):  
Primary Productivity ◽  
Forest Ecosystem ◽  
Net Primary Productivity ◽  
Deciduous Forest ◽  
Tropical Deciduous Forest ◽  
Western Mexico

Effects of deforestation on seed banks in a tropical deciduous forest of western Mexico

1999 ◽  
Vol 15 (2) ◽  
pp. 179-188 ◽  
Author(s):  
P. M. Miller
Keyword(s):  
Species Composition ◽  
Seed Bank ◽  
Growth Form ◽  
Deciduous Forest ◽  
Similarity Index ◽  
Tropical Deciduous Forest ◽  
Western Mexico ◽  
Pasture Grasses ◽  
One Year ◽  
Germinating Seeds

Seed density and seed bank species composition were determined by germination trials on soils collected during the initial phase of deforestation in a Mexican tropical deciduous forest. The reference forest, pre-burn, 1-d post-burn, and 1-y post-burn soils contained 700, 1000, 70 and 3500 germinating seeds m−2, of 30, 30, 8 and 13 species, respectively. A total of 43 dicotyledonous species were identified. Percentages of herbs, vines, shrubs and small trees/shrubs were similar in reference forest, pre-burn, and 1-d post-burn soils; herbs were the most common growth form. Pasture conversion greatly altered seed bank species composition; 81% of the species that germinated from the seed bank before burning were absent from the seed bank 1 d after the fires. One-year post-burn soil was dominated by monocots; only 3% of the seedlings were herbs; no vines, small trees/shrubs or trees germinated. The reference forest and the pre-burn soils had 18 dicot species in common and the highest similarity index, 0.43; six of the shared species were herbs. One-day and 1-y post-burn soils had the lowest similarity index, 0.05. Burning the slashed forest and conversion to cattle pasture depleted the original seed bank, replacing it by one dominated by pasture grasses.

Coyote (Canis latrans) Food Habits in a Tropical Deciduous Forest of Western Mexico

2001 ◽  
Vol 146 (1) ◽  
pp. 210-216 ◽  
Author(s):  
MIRCEA G. HIDALGO-MIHART ◽  
LISETTE CANTÚ-SALAZAR ◽  
CARLOS A. LÓPEZ- GONZÁLEZ ◽  
ENRIQUE MARTÍNEZ-MEYER ◽  
ALBERTO GONZÁLEZ-ROMERO
Keyword(s):  
Food Habits ◽  
Deciduous Forest ◽  
Canis Latrans ◽  
Tropical Deciduous Forest ◽  
Western Mexico

Seasonal effects on soil organic carbon dynamics in a tropical deciduous forest ecosystem in western Mexico

2003 ◽  
Vol 19 (2) ◽  
pp. 179-188 ◽  
Author(s):  
Felipe García-Oliva ◽  
Biserka Sveshtarova ◽  
Magdalena Oliva
Keyword(s):  
Microbial Activity ◽  
Forest Ecosystem ◽  
Deciduous Forest ◽  
Dry Season ◽  
Soil Samples ◽  
Seasonal Effects ◽  
Tropical Deciduous Forest ◽  
Wet Season ◽  
Organic C ◽  
Western Mexico

Our study examines the effect of seasonal rains on soil organic C dynamics in a tropical deciduous forest ecosystem in Western Mexico. At the end of the wet season, an accumulation of labile nutrient forms developed and was maintained during the dry season. This accumulation enhances microbial activity in the first rains of the wet season. For example, the litter samples of the dry season had a higher C and N mineralization than those of the wet season. Similarly, the January soil samples had higher C mineralization than October soil samples (55 and 34 μg C g-1 d-1, respectively). These results suggest that the quality of C is strongly affected by the seasonality of rains, which in turn influences microbial activity. This seasonality also influences nutrient redistribution between soil aggregate fractions. Chemical changes across seasons suggest that soil organic matter associated with macro-aggregates represents the main source of energy for microbial activity at the beginning of the wet season, while micro-aggregates protect the labile nutrient forms during the growing season.

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