Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991
A survey al the intertidal polychaete fauna.of the laltepeque estuary, Pacific coast of El Salvador (13!IN - 89RW>, was conducted during December al 1990 (dry season) and luIy of 1991 (rainy season). A total of 15 stations were sampled along the estuary, and 15 core samples (core area: 17.7 c...
| Autores principales: | , |
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| Formato: | Online |
| Idioma: | spa |
| Publicado: |
Universidad de Costa Rica
1995
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| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/rbt/article/view/22429 |
| id |
RBT22429 |
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| record_format |
ojs |
| institution |
Universidad de Costa Rica |
| collection |
Revista de Biología Tropical |
| language |
spa |
| format |
Online |
| author |
Molina Lara, Oscar Armando Vargas Zamora, José A |
| spellingShingle |
Molina Lara, Oscar Armando Vargas Zamora, José A Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 |
| author_facet |
Molina Lara, Oscar Armando Vargas Zamora, José A |
| author_sort |
Molina Lara, Oscar Armando |
| description |
A survey al the intertidal polychaete fauna.of the laltepeque estuary, Pacific coast of El Salvador (13!IN - 89RW>, was conducted during December al 1990 (dry season) and luIy of 1991 (rainy season). A total of 15 stations were sampled along the estuary, and 15 core samples (core area: 17.7 cm2) collected at each one, to a depth of 15 cm into the sedimento Samples were preserved in 10% fonnalin in sea water stained with Rose Bengal. A 500 rnicron mesh sieve was used to separate the organisms from the sediments. A total of 450 core samples yielded 5315 polychaetes distributed among 30 species. Densities ranged between 111 and 22 296 per m2, with a mean of about 6 500. The salinity gradient along the axis of the estuary ranged between 14 and 300/00 during the rainy season, and from 22 to 300/00 during the dry season. This gradient is smaller than that observed (O to 310/00) in a polychaete survey conducted over, a one year period, at the site in the late 1950's. A comparison al the polychaete species found in both studies only yie1ded 28% similarity (Sorensen's index), even though samples were collected at nearly the same stations. Altbough the durations of both studies differ considerably, we cxpected to find more species in common. The total number of species collected in both studies was, however, very similar (30 and 36). Data presented in this paper provide evidence to support the hypothesis that the polychaete fauna in the laltepeque estuary is presently composed of more eurihaline species than in the past. The laltepeque estuary region has undergone considerable development over recent decades, but a direct impact on its benthic fauna is difficult to assess. That this fauna was studied in the late 1950's as well as in this paper, provides a unique reference framework, very rare in benthic tropical research, for future more complcx surveys. |
| title |
Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 |
| title_short |
Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 |
| title_full |
Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 |
| title_fullStr |
Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 |
| title_full_unstemmed |
Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 |
| title_sort |
poliquetos (annelida: polychaeta) del estero de jaltepeque, el salvador una comparación 1959-1991 |
| title_alt |
Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 |
| publisher |
Universidad de Costa Rica |
| publishDate |
1995 |
| url |
https://revistas.ucr.ac.cr/index.php/rbt/article/view/22429 |
| work_keys_str_mv |
AT molinalaraoscararmando poliquetosannelidapolychaetadelesterodejaltepequeelsalvadorunacomparacion19591991 AT vargaszamorajosea poliquetosannelidapolychaetadelesterodejaltepequeelsalvadorunacomparacion19591991 |
| _version_ |
1810114871354720256 |
| spelling |
RBT224292022-05-20T15:04:31Z Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 Poliquetos (Annelida: Polychaeta) del estero de Jaltepeque, El Salvador una comparación 1959-1991 Molina Lara, Oscar Armando Vargas Zamora, José A polychaetes tropical benthos estuary mangroves macrofauna benthic communities El Salvador A survey al the intertidal polychaete fauna.of the laltepeque estuary, Pacific coast of El Salvador (13!IN - 89RW>, was conducted during December al 1990 (dry season) and luIy of 1991 (rainy season). A total of 15 stations were sampled along the estuary, and 15 core samples (core area: 17.7 cm2) collected at each one, to a depth of 15 cm into the sedimento Samples were preserved in 10% fonnalin in sea water stained with Rose Bengal. A 500 rnicron mesh sieve was used to separate the organisms from the sediments. A total of 450 core samples yielded 5315 polychaetes distributed among 30 species. Densities ranged between 111 and 22 296 per m2, with a mean of about 6 500. The salinity gradient along the axis of the estuary ranged between 14 and 300/00 during the rainy season, and from 22 to 300/00 during the dry season. This gradient is smaller than that observed (O to 310/00) in a polychaete survey conducted over, a one year period, at the site in the late 1950's. A comparison al the polychaete species found in both studies only yie1ded 28% similarity (Sorensen's index), even though samples were collected at nearly the same stations. Altbough the durations of both studies differ considerably, we cxpected to find more species in common. The total number of species collected in both studies was, however, very similar (30 and 36). Data presented in this paper provide evidence to support the hypothesis that the polychaete fauna in the laltepeque estuary is presently composed of more eurihaline species than in the past. The laltepeque estuary region has undergone considerable development over recent decades, but a direct impact on its benthic fauna is difficult to assess. That this fauna was studied in the late 1950's as well as in this paper, provides a unique reference framework, very rare in benthic tropical research, for future more complcx surveys. A survey al the intertidal polychaete fauna.of the laltepeque estuary, Pacific coast of El Salvador (13!IN - 89RW>, was conducted during December al 1990 (dry season) and luIy of 1991 (rainy season). A total of 15 stations were sampled along the estuary, and 15 core samples (core area: 17.7 cm2) collected at each one, to a depth of 15 cm into the sedimento Samples were preserved in 10% fonnalin in sea water stained with Rose Bengal. A 500 rnicron mesh sieve was used to separate the organisms from the sediments. A total of 450 core samples yielded 5315 polychaetes distributed among 30 species. Densities ranged between 111 and 22 296 per m2, with a mean of about 6 500. The salinity gradient along the axis of the estuary ranged between 14 and 300/00 during the rainy season, and from 22 to 300/00 during the dry season. This gradient is smaller than that observed (O to 310/00) in a polychaete survey conducted over, a one year period, at the site in the late 1950's. A comparison al the polychaete species found in both studies only yie1ded 28% similarity (Sorensen's index), even though samples were collected at nearly the same stations. Altbough the durations of both studies differ considerably, we cxpected to find more species in common. The total number of species collected in both studies was, however, very similar (30 and 36). Data presented in this paper provide evidence to support the hypothesis that the polychaete fauna in the laltepeque estuary is presently composed of more eurihaline species than in the past. The laltepeque estuary region has undergone considerable development over recent decades, but a direct impact on its benthic fauna is difficult to assess. That this fauna was studied in the late 1950's as well as in this paper, provides a unique reference framework, very rare in benthic tropical research, for future more complcx surveys. Universidad de Costa Rica 1995-12-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Article application/pdf https://revistas.ucr.ac.cr/index.php/rbt/article/view/22429 Revista de Biología Tropical; Vol. 43 No. 1-3 (1995): Volume 43 – Regular number 1-3 – April-December 1995; 195–205 Revista de Biología Tropical; Vol. 43 Núm. 1-3 (1995): Volumen 43 – Número regular – Abril-Diciembre 1995; 195–205 Revista Biología Tropical; Vol. 43 N.º 1-3 (1995): Volume 43 – Regular number 1-3 – April-December 1995; 195–205 2215-2075 0034-7744 10.15517/rbt.v43i1-3 spa https://revistas.ucr.ac.cr/index.php/rbt/article/view/22429/22597 Copyright (c) 1995 Revista de Biología Tropical http://creativecommons.org/licenses/by/4.0 |