Abstract
Diversity of terrestrial gastropod mollusks in the Pacific region of Nicaragua, and their habitat preferences. Landsnail communities of the Nicaraguan Pacific Slope were studied. The study area was subdivided into 21 quadrats (ca. 40 x 40 km). A high taxonomic richness was found: 79 species, 43 genera and 23 families. Species richness (S) per quadrat ranged from 17 through 50. The biogeographic index presented higher values on quadrats 5 (3.04), 6 (3.03), 8 (2.96) and 11(2.96). Quadrat 11 had the highest species richness (S=50), and one of the highest biogeographic index values (IB=2.96). Gastropod mollusk communities are favored by sites with an illumination of filtered sun, associated to riparian forests and with a susbtratum of wet soils and leaf litter.
Highlights
Según Pérez et al (1996), los estudios comunitarios o a nivel de paisajes en moluscos u otros invertebrados terrestres en general son escasos
The study area was subdivided into 21 quadrats
Gastropod mollusk communities are favored by sites with an illumination of filtered sun, associated to riparian forests and with a susbtratum of wet soils and leaf litter
Summary
Área de estudio: Nicaragua con una superficie terrestre de 118 358 km, se encuentra dividida en tres zonas geográficas principales: 1. La zona del Pacífico (38 700 km2), 2. Las recolectas se realizaron siempre por debajo de los 500 msnm ya que la región del Pacífico es mayoritariamente llana. Las mismas comunidades locales de gasterópodos, en la región del Pacífico de Nicaragua, existen variaciones estacionales entre ambas estaciones del año (lluvia y seca); sin embargo, la comunidad de lluvia contiene por completo a la comunidad de seca y tiene además una mayor riqueza de especies Análisis numérico: se calculó el índice (S) de riqueza de especies (Ludwig y Reynolds 1988) que no es más que la cantidad de especies presentes en este caso en una cuadrícula de 40x40 km; se cuantificaron los individuos totales, vivos y/o conchas. Hábitat: al analizar el tipo de vegetación (Fig. 3), encontramos que existe una CUADRO 1 Índices ecológicos calculados en las comunidades de moluscos gasterópodos terrestres del Pacífico de Nicaragua
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