| variation in the bemisia tabaci s. l. species complex (hemiptera: aleyrodidae) and its natural enemies leading to successful biological control of bemisia biotype b in the usa. | parasitoids of the bemisia tabaci (gennadius) species complex collected in spain and thailand were evaluated as biological control agents of b. tabaci biotype b in cole crops in texas, usa. parasitoids were identified by morphological and rapd-pcr analyses. the most abundant parasitoid from spain was eretmocerus mundus mercet with apparent field parasitism of 39-44%. in thailand, encarsia formosa gahan, e. transvena timberlake, e. adrianae lopez-avila, eretmocerus sp. 1 and sp. 2 emerged, with a ... | 2000 | 11020790 |
| distribution and stability of supernumerary microchromosomes in natural populations of the amazon molly, poecilia formosa. | in animals, supernumerary chromosomes and their evolution have mostly been studied in sexual reproducing species. in the present study, for the first time, the natural distribution and stability of supernumerary microchromosomes were investigated in the unisexual fish species poecilia formosa. natural habitats throughout the range of p. formosa were screened for the presence of microchromosomes over several years. a high frequency of microchromosomes was found in the río purificación river syste ... | 2004 | 15292590 |
| female sperm limitation in natural populations of a sexual/asexual mating complex (poecilia latipinna, poecilia formosa). | in sperm-dependent sexual/asexual mating systems, male mate choice is critical for understanding the mechanisms behind apparent stability observed in natural populations. the gynogenetic amazon molly (poecilia formosa) requires sperm from sexual males (e.g. poecilia latipinna) to trigger embryogenesis, but inheritance is strictly maternal. consequently, males should try to avoid or reduce the cost of mating with asexuals. we investigated male mate choice by documenting the presence of sperm in n ... | 2008 | 18319207 |
| feeding rates in the sailfin molly poecilia latipinna and its coexisting sexual parasite, the gynogenetic amazon molly poecilia formosa. | feeding rates of the gynogenetic amazon molly poecilia formosa and one of its sexual hosts, the sailfin molly poecilia latipinna, were measured under winter and summer temperature conditions. food consumption of the unisexual p. formosa in winter conditions was significantly higher than that of p. latipinna, and it is hypothesized that the resulting food stress might have an important influence on the population composition of these closely related fishes via higher winter mortality in p. formos ... | 2010 | 20646153 |