User profiles for Oscar J. Rocha

Oscar Rocha

Kent State University
Verified email at kent.edu
Cited by 1851

Reproductive biology of the dry forest tree Enterolobium cyclocarpum (guanacaste) in Costa Rica: a comparison between trees left in pastures and trees in …

OJ Rocha, G Aguilar - American Journal of Botany, 2001 - Wiley Online Library
We compared the rate of pollen deposition, the likelihood of fruit production, the number of
seeds per fruit, the outcrossing rate, and the progeny vigor of the tropical dry forest tree …

The Structure of Morphological and Genetic Diversity in Natural Populations of Carica papaya (Caricaceae) in Costa Rica

JE Brown, JM Bauman, JF Lawrie, OJ Rocha… - Biotropica, 2012 - Wiley Online Library
In Costa Rica, dioecious Carica papaya has been observed growing in disturbed areas and
within secondary lowland forests. Such populations can serve as a reservoir of genetic and …

EFFECTS OF NONRANDOM SEED ABORTION ON PROGENY PERFORMANCE IN PHASEOLUS COCCINEUS L

OJ Rocha, AG Stephenson - Evolution, 1991 - academic.oup.com
In this study, we sought to determine if Phaseolus coccineus normally aborts potentially
viable seeds, and whether seed abortion is nonrandom with respect to progeny vigor. The …

Impacts of the emerald ash borer (EAB) eradication and tree mortality: potential for a secondary spread of invasive plant species

CE Hausman, JF Jaeger, OJ Rocha - Biological invasions, 2010 - Springer
Since the discovery of the emerald ash borer in 2002, eradication efforts have been implemented
in an attempt to eliminate or contain the spread of this invasive beetle. The eradication …

Detection of dengue virus neutralizing antibodies in bats from Costa Rica and Ecuador

…, OJ Rocha, ME Zaldivar, J Mora… - Journal of medical …, 2000 - academic.oup.com
Neutralizing antibodies for dengue virus serotypes 1 and 2 and serotypes 2 and 3 were
detected in 1998 in 12 of 53 (22.6%) and 3 of 10 (30.0%) bats sampled in Costa Rica and …

Species diversity of edible plants grown in homegardens of Chibchan Amerindians from Costa Rica

ME Zaldivar, OJ Rocha, E Castro, R Barrantes - Human Ecology, 2002 - Springer
We studied edible crop species diversity at homegardens of two Chibchan Amerindian Reserves
in Costa Rica: Talamanca and Coto Brus. We visited six settlements at Talamanca and …

Soil seed bank and seed dormancy in wild populations of lima bean (Fabaceae): considerations for in situ and ex situ conservation

J Degreef, OJ Rocha, T Vanderborght… - American Journal of …, 2002 - Wiley Online Library
Seed dormancy and its impact on the soil seed bank for wild Lima bean (Phaseolus lunatus)
populations were studied in the Central Valley of Costa Rica. Five populations were …

Selective Seed Abortion Affects the Performance of the Offspring in Bauhinia ungulata

JI Mena-Ali, OJ Rocha - Annals of botany, 2005 - academic.oup.com
• Background and Aims Under the microgametophytic competition hypothesis, a non-random
pattern of seed abortion is expected, in which only the most vigorous seeds reach maturity. …

Effect of ovule position on seed production, seed weight, and progeny performance in Phaseolus coccineus L.(Leguminosae)

OJ Rocha, AG Stephenson - American Journal of Botany, 1990 - Wiley Online Library
We examined the effect of ovule position within the ovary on the probability of seed maturation,
on seed weight, and on progeny performance in the outbreeding legume Phaseolus …

Variation in the breeding behavior of the dry forest tree Enterolobium cyclocarpum (guanacaste) in Costa Rica

OJ Rocha, G Aguilar - American Journal of Botany, 2001 - Wiley Online Library
We studied the breeding systems of four populations of Enterolobium cyclocarpum (guanacaste,
earpod tree) in Costa Rica. Multilocus estimates of the outcrossing rate indicate that E. …