Diversidad de insectos minadores de hojas y formadores de agallas en el dosel y sotobosque del bosque tropical

Acta Zoologica (Impact Factor: 1.26). 01/2003; 89:153-168.
Source: DOAJ


RESUMEN Con el proposito de estimar en que estrato del bosque tropical ocurre mayor diversidad de especies de insectos formadores de agallas y minadores de hojas, se realizaron muestreos desde marzo de 1997 a mayo de 1998 en dos bosques de la República de Panamá (Parque Natural Metropolitano y Fuerte Sherman). Nuestros resultados indican que en el dosel de ambos bosques existe mayor riqueza de insectos formadores de agallas y minadores de hojas que en el sotobosque, siendo la proporción de especies de estos dos grupos en el dosel y sotobosque de 2:1 respectivamente. El índice alfa de Fisher indica que los dos grupos de insectos son más diversos en el dosel de los dos bosques que en el sotobosque, siendo el dosel del Fuerte Sherman donde ocurre mayor abundancia de algunas morfoespecies. Palabras Claves: diversidad, dosel, insecto formador de agalla, insecto minador de hoja, Panamá, riqueza de especies, sotobosque. ABSTRACT To estimating in which layer of the tropical forest occurs the highest diversity of species of insect gall-makers and leaf miners, a survey was performed from March 1997 to May 1998 in two forests of the Republic of Panama (Parque Natural Metropolitano and Fuerte Sherman). Our results indicate that the canopy of tropical forest supports a higher species richness of insect gall-maker and leaf miners than the understorey. The proportion of species of both of these groups in the canopy and understorey is 2:1, respectively. The Fisher index alpha indicates that both groups of insects are more diverse in the canopy that in the understorey, the canopy of Fuerte Sherman being where the highest abundance of some morphospecies occurs.

Download full-text


Available from: Anayansi Valderrama
  • Source
    • "y una colección propia creada durante el presente estudio (Medianero et al., 2003). "
    [Show abstract] [Hide abstract]
    ABSTRACT: The study of trophic coexistence in bird species is relevant to their management and conservation. From January to October 2008, feeding behaviors and entomological diet components of Melanerpes formicivorous and Picoides scalaris were identified. Fixed radius points were used to observe birds, mist nest were used to capture them. Melanerpes formicivorous and Picoides scalaris preferred the hunting techniques Drilling and Collecting during feeding behaviors. These hunting techniques were explained by five and four variables (P<0.05), respectively. The strata Pinus cembroides and Quercus spp were the most common by both species. Coleoptera and Hemiptera were the most consumed insect orders. The main families recorded correspond to Scolytidae, Curculionidae, Pentatomidae, Cicadellidae, Cleridae and Melyridae. The types of insects most consumed by both species were Pest (P), No Pest (NP) and Predators (PR). A significant proportion of individuals (X(2)=9.19, X(0.001(5))(2)=20.5) of insects in diets was recorded. However, it was not possible to record all insect fragments (X(2)=56.33, X(0.001(5))(2)=20.5). The number of individuals (a=0.05, P-value=0.2317) and fragments (a=0.05, P-value=0.2606) among species was similar. Seven variables (P<0.05) determined the occurrence of fat and consumption of prey. Although the two species of woodpeckers studied have similar anatomy, physiology and ethology, they trophically coexisted in ANPPA segregated during their feeding process minimizing, in this way, interspecific competition.
    Full-text · Article · Jun 2011 · Revista Chapingo, Serie Ciencias Forestales y del Ambiente
  • Source
    • "In mainland Panama , the gall - inducing insect community in two rain forest areas separated by 90 km shared two species ( Medianero et al 2003 ) . Turnover of gall - inducing species is also reported for vertical distribution ; in a dry forest in Panama , of 50 gall - inducing insects collected , the canopy community shared just three species with the understorey community ( separated by 40 m ; Medianero et al 2003 ) . Our results suggest that beta diversity is a very important factor in local gall - inducing arthropod community composition and that geographic distance is not correlated with similarity in gall - inducing species composition between the studied sites . "
    [Show abstract] [Hide abstract]
    ABSTRACT: Many studies over the past twenty years have documented the richness of arthropod galling species around the world, and some have proposed hypotheses to explain local and global patterns of galling species richness. However, few studies have been directed toward understanding how the gall-inducing species are locally distributed. The aim of this study was to determine the distribution of gall-inducing arthropods species at Coiba National Park, a tropical habitat on the Pacific coast of Panama. Our results suggest that more gall-inducing species had an aggregated distribution, and gall-inducing arthropod diversity shows a strong beta diversity component. Geographic distance was not correlated with similarity in gall-inducing species composition between the studied sites. This fact has important implications when trying to estimate gall-inducing arthropod richness and general patterns, and could cause contradictory results for hypotheses that attempt to explain the local and global patterns of galling species richness.
    Full-text · Article · May 2010 · Neotropical Entomology
  • Source
    • "The mean canopy tree height is 45 m, and the canopy is dominated by Brosimun utile (Moraceae) (Basset et al, 2003). Gall maker diversity was Fisher's a = 6.45 with 37 morphospecies in the understorey, and Fisher's a = 8.53 with 20 morphospecies in the canopy (Medianero et al, 2003). parasitoid adults were preserved in vials with 70% ethanol. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Abstract 1. Networks of feeding interactions among insect herbivores and natural enemies such as parasitoids, describe the structure of these assemblages and may be critically linked to their dynamics and stability. The present paper describes the first quantitative study of parasitoids associated with gall-inducing insect assemblages in the tropics, and the first investigation of vertical stratification in quantitative food web structure. 2. Galls and associated parasitoids were sampled in the understorey and canopy of Parque Natural Metropolitano in the Pacific forest, and in the understorey of San Lorenzo Protected Area in the Caribbean forest of Panama. Quantitative host–parasitoid food webs were constructed for each assemblage, including 34 gall maker species, 28 host plants, and 57 parasitoid species. 3. Species richness was higher in the understorey for parasitoids, but higher in the canopy for gall makers. There was an almost complete turnover in gall maker and parasitoid assemblage composition between strata, and the few parasitoid species shared between strata were associated with the same host species. 4. Most parasitoid species were host specific, and the few polyphagous parasitoid species were restricted to the understorey. 5. These results suggest that, in contrast to better-studied leaf miner–parasitoid assemblages, the influence of apparent competition mediated by shared parasitoids as a structuring factor is likely to be minimal in the understorey and practically absent in the canopy, increasing the potential for coexistence of parasitoid species. 6. High parasitoid beta diversity and high host specificity, particularly in the poorly studied canopy, indicate that tropical forests may be even more species rich in hymenopteran parasitoids than previously suspected.
    Full-text · Article · May 2009 · Ecological Entomology
Show more