Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem
We examined short-term differences in assemblage organization of surface-active arthropods from a restricted portion of a coastal dune ecosystem near Puerto Peñasco, Sonora, Mexico. To test the hypothesis that soil moisture gradients influence organization, we established three, 32-m transects runni...
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| Format: | Online |
| Sprache: | eng |
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Instituto de Ecología, A.C.
1989
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| Online Zugang: | https://azm.ojs.inecol.mx/index.php/azm/article/view/1934 |
| _version_ | 1799770321504436224 |
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| author | Crawford, Clifford S. Campbell, Mariel L Schaedla, William H. Wood, Sarah |
| author_facet | Crawford, Clifford S. Campbell, Mariel L Schaedla, William H. Wood, Sarah |
| author_sort | Crawford, Clifford S. |
| collection | AZM |
| description | We examined short-term differences in assemblage organization of surface-active arthropods from a restricted portion of a coastal dune ecosystem near Puerto Peñasco, Sonora, Mexico. To test the hypothesis that soil moisture gradients influence organization, we established three, 32-m transects running westward from real or simulated shorelines of 1)an estuary terminus ("estero") 2) a salt-water pond ("seep"), and 3) an intermediate dry desert site ("control"). Transect moisture gradients ranged, at the estero and seep sites respectively, from 15% and 11% to<1%, while soil moisture at the control site was <1% mead values to 15 cm depths). Four evenly spaced plots, each 3x7m, along each transect contained pitfall traps that captured arthropods continuously for eight (estero, seep), or six (control), 12-h periods. We trapped 558 arthropods comprising 50 species, excluding abundant ants of the genus Solenopsis. Rarefaction analysis for sample sizes of 80 gave expected species numbers, E(Sn), of 27 (estero), 21.5 (seep), and 18 (control) when the swamping effect of Uca latimanus (crabs) which were dominant at the estero, absent elsewhere) was removed. Arthropods other than crabs were twice as abundant at the estero and four time as abundant at night, respectively, as they were at the other two sites and during the day. Carnivore: detritivore species ratios at the three sites were approximately 2:1 (estero), 1:1 (seep), and 1:2 (control). Evenness (modified Hill's E5) values without Uca were similar at all sites; however, high diversity (Hill´'s N2) values for the estero assemblage confirmed the presence of a small number of abundant species (carabid beetles, lycosid spiders) there. We found no significant correlation between percent plant cover and totaldensities or species richness of trapped arthropods. Measurements of beta-diversity (Sorensen's community coefficient) reinforced the uniqueness of the estero assemblage. Our initial hypothesis received support in that species differences, individual abundances, and carnivore: detritivore rations all tended to increase along moisture gradients. |
| format | Online |
| id | azm-article-1934 |
| institution | Acta Zoológica Mexicana |
| language | eng |
| publishDate | 1989 |
| publisher | Instituto de Ecología, A.C. |
| record_format | ojs |
| spelling | azm-article-19342023-01-25T04:30:33Z Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem Crawford, Clifford S. Campbell, Mariel L Schaedla, William H. Wood, Sarah We examined short-term differences in assemblage organization of surface-active arthropods from a restricted portion of a coastal dune ecosystem near Puerto Peñasco, Sonora, Mexico. To test the hypothesis that soil moisture gradients influence organization, we established three, 32-m transects running westward from real or simulated shorelines of 1)an estuary terminus ("estero") 2) a salt-water pond ("seep"), and 3) an intermediate dry desert site ("control"). Transect moisture gradients ranged, at the estero and seep sites respectively, from 15% and 11% to<1%, while soil moisture at the control site was <1% mead values to 15 cm depths). Four evenly spaced plots, each 3x7m, along each transect contained pitfall traps that captured arthropods continuously for eight (estero, seep), or six (control), 12-h periods. We trapped 558 arthropods comprising 50 species, excluding abundant ants of the genus Solenopsis. Rarefaction analysis for sample sizes of 80 gave expected species numbers, E(Sn), of 27 (estero), 21.5 (seep), and 18 (control) when the swamping effect of Uca latimanus (crabs) which were dominant at the estero, absent elsewhere) was removed. Arthropods other than crabs were twice as abundant at the estero and four time as abundant at night, respectively, as they were at the other two sites and during the day. Carnivore: detritivore species ratios at the three sites were approximately 2:1 (estero), 1:1 (seep), and 1:2 (control). Evenness (modified Hill's E5) values without Uca were similar at all sites; however, high diversity (Hill´'s N2) values for the estero assemblage confirmed the presence of a small number of abundant species (carabid beetles, lycosid spiders) there. We found no significant correlation between percent plant cover and totaldensities or species richness of trapped arthropods. Measurements of beta-diversity (Sorensen's community coefficient) reinforced the uniqueness of the estero assemblage. Our initial hypothesis received support in that species differences, individual abundances, and carnivore: detritivore rations all tended to increase along moisture gradients. Examinamos las diferencias a corto plazo en la organización de las comunidades de artrópodos activos en la superficie del suelo en una porción restringida del ecosistema de dunas cerca de Puerto Peñasco, Sonora, México. Para probar la hipótesis de que el gradiente de humedad del suelo influye en tal organización, se estabecieron tres transectos de 32 m en dirección oeste hacia la costa f) área de estero, 2) estanque de agua salada, y 3) área intermedia de desierto seco (control). El gradiente de humedad varió en el estero y estanque de 15% y 11% a <1% respectivamente, mientras que la humedad del suelo en la área control fue de <1% (valores promedio a 15 cm de profundidad). Cuatro lotes, proporcionalmente espaciados de 3 x 7 m a lo largo del transecto con trampas "pitfair capturaron artrópodos continuamente por períodos de 12 horas, el número de trampas fue ocho en el estero, ocho en el estanque y seis en el control. Se capturaron 558 artrópodos pertenecientes a 50 especies, se excluyeron las numerosas hormigas del género Solenopsis. El análisis de "rarefaction" con 80 como tamaño de muestra, mostró valores de 27 en el estero, 21.5 en el estanque y 18 para el sitio de control, cuando se eliminó el efecto de pantano de Uca ¡atimanus (cangrejo que fue dominante en el estero y ausente en los otros dos sitios). los artrópodos, excluyendo cangrejos, fueron doblemente abundantes en el estero durante el día y cuatro veces más abundantes en la noche que en los otros dos sitios durante el día. la proporción carnívoros-detritívoros en los tres sitios fue aproximadamente 2:1 (estero), 1:1 (estanque) y 1:2 (control). El valor de similitud (modificado de Hill E5) sin Uca fue similar en todos los sitios; sin embargo, grandes valores en diversidad (Hill N2) confirman la presencia de numerosas especies en el estero (escarabajos Carabidae y arañas lycosídae). No se encontró relación significativa entre el porcentaje de cobertura vegetal y la densidad de artrópodos capturados. la medida del valor beta-diversidad (coeficiente de comunidad de S^rensen) reafirma la particularidad de la organización en el estero. Nuestra hipótesis inicial fue parcial mente apoyada porque la diferencia de especies, abundancia de individuos y proporción carnívoros-detritívoros tendió a incrementarse con el gradiente de humedad. Instituto de Ecología, A.C. 1989-08-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Original articles Artículos originales application/pdf https://azm.ojs.inecol.mx/index.php/azm/article/view/1934 10.21829/azm.1989.31341934 ACTA ZOOLÓGICA MEXICANA (N.S.); No. 34 (1989); 31-51 ACTA ZOOLÓGICA MEXICANA (N.S.); Núm. 34 (1989); 31-51 2448-8445 0065-1737 eng https://azm.ojs.inecol.mx/index.php/azm/article/view/1934/2048 Derechos de autor 2018 Acta Zoológica Mexicana (parte1) http://creativecommons.org/licenses/by-nc-sa/4.0 |
| spellingShingle | Crawford, Clifford S. Campbell, Mariel L Schaedla, William H. Wood, Sarah Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem |
| title | Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem |
| title_full | Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem |
| title_fullStr | Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem |
| title_full_unstemmed | Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem |
| title_short | Assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal Sonoran Desert ecosystem |
| title_sort | assemblage organization of surface-active arthropods along horizontal moisture gradients in a coastal sonoran desert ecosystem |
| url | https://azm.ojs.inecol.mx/index.php/azm/article/view/1934 |
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