Please use this identifier to cite or link to this item: http://www.dspace.espol.edu.ec/handle/123456789/5229
Full metadata record
DC FieldValueLanguage
dc.contributor.authorCalles Procel, Alba Katherine-
dc.contributor.authorVincx, Magda-
dc.date.accessioned2009-06-02-
dc.date.available2009-06-02-
dc.date.issued2009-06-02-
dc.identifier.urihttp://www.dspace.espol.edu.ec/handle/123456789/5229-
dc.description.abstractT his thesis is part of a VLIR-ESPOL project, being a co-operation between the University of Gent (Belgium) and ESPOL (Escuela Superior Politécnica del Litoral, Ecuador). During August 1999, meiofauna was collected from the intertidal Ecuadorian sandy beaches in five stations along of Guayas province. This thesis is the first scientific contribution to the study of the meiobenthos from that area. The work includes the study of the structure of the meiofauna communities, especially on the most dominant taxon: Nematoda. The composition and diversity of nematodes and their relationship with environmental factors was examined and discussed. The sampling was made during low tidal and three replicate cores were taken to meiofauna identification and one to granulometric analysis (10 cm2 surface). The meiofauna samples were immediately fixed in hot (60 °C), 4% formaldehyde solution. In the laboratory a series of sieving, decantation and centrifugation were done to separate the meiofauna from the sand and detritus. Five meiofauna taxa were identified and quantified, the densities ranged between 349-2544 ind./10 cm2. Nematoda was the most dominant taxon with 87.1% of the meiofauna, second dominant taxon was Gastrotricha with 8.2 %, which is one of the highest densities ever recorded for marine sediments. The nematode composition showed that most dominant genus were: Metadesmolaimus (28.5%), second most dominant was Metachromadora (22.8%), followed by Paracyatholaimus (17.1%) and Daptonema (10.4%). The following genus represented less of 10%: Anoplostoma, Bathylaimus, Ceramonema, Enoplolaimus, Gonionchus, Halalaimus, Neochromadora, Odontanticoma, Odontophora, Omicronema, Paradontophora, Rhynchonema, Sinonchyella, Sabatiera and Viscosia. A total of 19 genera belonging to 14 families were identified. Non-selective deposit feeders (1B) were the most abundant feeding group, mainly at Playas and Salinas I stations which reflects the high concentration of Metadesmolaimus at these stations. The second abundant feeding group was the predators (2B), represented by two genus: Metachromadora and Paracyatholaimus. The selective deposit-feeders (1A) and epistratum-feeders (2A), both were not highly incident. In our study two of the five stations (Salinas and Playas) are beaches under strong anthropogenic pressure, which had substantial impact on the interstitial life and beach ecosystem functioning. The diversity index did not show great variability, only Playas (B) site exhibit a highest diversity (14 genus), followed by Cenaim (B) station (12 genus). TWINSPAN and PCA analyses revealed that the density distribution of nematodes displayed a significant correlation with biogenic factors such as chlorophyll a, POM and SPM principally, but not happened it with median of sediment grain size and percentage of sand and silt. The result of the present study was discussed in comparison with other areas of worldwide meiobenthos studies.en
dc.language.isoengen
dc.rightsopenAccess-
dc.subjectSEDIMENTen
dc.subjectANTHROPOGENICen
dc.titleBiodiversity of the meiobenthos of sandy beaches in Ecuador with emphasis on free-living marine nematodesen
dc.typebachelorThesisen
Appears in Collections:Tesis - CADS

Files in This Item:
File Description SizeFormat 
5CERROS.JPGFotografia175.75 kBJPEGThumbnail
View/Open
8648.docDocumento de Tesis307 kBMicrosoft WordView/Open
8649.docDocumento de Tesis31.5 kBMicrosoft WordView/Open
8650.docDocumento de Tesis36 kBMicrosoft WordView/Open
8651.docDocumento de Tesis52.5 kBMicrosoft WordView/Open
APPENDIX 9.TXTDocumento de Tesis1.83 kBTextView/Open
8653.docDocumento de Tesis30.5 kBMicrosoft WordView/Open
8654.docDocumento de Tesis19 kBMicrosoft WordView/Open
8655.docDocumento de Tesis78.5 kBMicrosoft WordView/Open
8656.pptPresentación2.85 MBMicrosoft PowerpointView/Open
DESECADOR-STOVE_IMG.JPGFotografia57.55 kBJPEGThumbnail
View/Open
8658.docDocumento de Tesis280.5 kBMicrosoft WordView/Open
8659.docDocumento de Tesis280.5 kBMicrosoft WordView/Open
FIG1.JPGFotografia85.37 kBJPEGThumbnail
View/Open
FIG2.JPGFotografia86.19 kBJPEGThumbnail
View/Open
FIG4.JPGFotografia89.6 kBJPEGThumbnail
View/Open
FIG5.JPGFotografia85.25 kBJPEGThumbnail
View/Open
FIG6.JPGFotografia75.75 kBJPEGThumbnail
View/Open
FIG7.JPGFotografia112.67 kBJPEGThumbnail
View/Open
FIG3.JPGFotografia84.29 kBJPEGThumbnail
View/Open
GUAYAS2.GIFFotografia49.76 kBGIFThumbnail
View/Open
8668.docDocumento de Tesis417.5 kBMicrosoft WordView/Open
8669.docDocumento de Tesis72.5 kBMicrosoft WordView/Open
8670.docDocumento de Tesis99.5 kBMicrosoft WordView/Open
8671.docDocumento de Tesis571 kBMicrosoft WordView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.