{"refrec":{"BRefID":9476,"RR":"<b>Seip, P.A.; Brand, R.<\/b> (1987). Inventarisatie van macrozoobenthos in de Voordelta: dichtheden voor de najaarstocht van 1984 en de voorjaarstocht van 1985. <i>NIOZ-rapport<\/i>, 1987(1). Nederlands Instituut voor Onderzoek der Zee: Texel. 36 pp.","BEntID":9476,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>NIOZ-rapport<\/i>, 1987(1). Nederlands Instituut voor Onderzoek der Zee: Texel.  36 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Seip, P.A.; Brand, R.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Seip, P.A.; Brand, R.","Englishabstract":"In the frame of the Fore-Delta-research (see introduction and fig. 1) a soil animal inventarisation has been done. Three trips were made: fall 1984, spring 1985(1985-1) and fall 1985 (1985-2). In this report the densities of the first and the second trip are discussed. In the (sublittoral) research area, that has a surface of ca. 1200 km\u00b2, 125 species were found, which are mentioned in table 1.The 14 most general species (vgl. Tables 16 and 27) are: -the chaetopods <i>Scoloplos armiger, Nephtys hombergii, Nephtys cirrosa, Magelona papillicornis, Spiophanes bombyx, Spio filicornis<\/i> and <i>Capitella capitata<\/i>; -the freshwater shrimp <i>Bathyporeia elegans<\/i> and <i>Urothoe poseidonis<\/i>; -the bivalves <i>Spisula subtruncata, Tellina fabula<\/i> and <i>Macoma balthica<\/i>; -the sea star <i>Ophiura texturata<\/i> and -the Nemertinea group). The approach is summarised in figure 2: the strategy of sample taking was adjusted to the results of the previous trip.By TWINSPAN-classification of density data of 1984 it showed a special pattern could be distinguished, as far as soil animal composition and densities were concerned, on two similar stations. This made a strata-classification (6 strata) based on soil animal data possible. At the start of the project this was not yet possible based on available soil or soil animal data. At the second trip, a \u201cstratified random\u201d sampling was then done to be able to estimate accurately the densities per stratum. Reliability intervals for the geometric average density are calculated. The data are log-transformed, then the average of the observations is determined and this value is then transformed back for the individual strata and for the entire area (see table 27, figures 29-35 and the figures of appendix 4a). A strong correlation between the geometric average density and the frequency of the species was found (see 4 and 6). During the comparison of the TWINSPAN-classification of the data of the first two BOVO-trips, similar special patterns were discovered, stable zonation be it (see figures 25-28). The strata classification, deduced from the second trip and used for the third, is refined (10 strata), compared to the previous strata classification (6 strata) based on the first trip (see overlays 1 and 2). The northern strata (fine sand with low-average mud content) are relatively rich in species and individuals per sample (see figures 52 and 53). The Wester Scheldt mouth (with a high mud content in the mainly fine sand soils and the highly suppressive dust content in the water column) and parts of the Easter Scheldt mouth (where, in accordance to the high speed of streams, low mud contents are found in the middle grove sandy soil) showed few species and individuals per sample in 1984-1985 (see figures 23 and 24). Per stratum an abiotic description is given (see 3 and table 9). Per species correlations were sought in a graphic way with measured soil factors and the depth, and the ecologic distribution was researched, based on data from the second trip (see 5 and e.g. the figures 38, 41 and 45). On the entire density-dataset (1984 and 1985-1 apart) an ordination (DECORANA) technique has been applied, and more research for order-correlation with measured soil factors and the depth (see 2.5). These proved to be statistically significant correlated with one or more of the DECORANA-ordination-axes (see 5). Extremely high correlations were found with the mud content (and the group of correlated variables) (see table 26 and fig. 49). In relation to the application of different techniques for sample taking (Reineck-box corer and Van Veen-grab), these have been compared to each other on penetration-depth and density estimations for soil animals (see 2). The Box-Corer penetrated (mean 26 cm) noticeably deeper than the Van Veen-grab (mean 15 cm) (see table 4 en figures 3a en 3b). Only for the polychaetes <i>Magelona papillicornis<\/i> and <i>Nephtys cirrosa<\/i> and for the amphipode <i>Urothoe poseidonis<\/i> the density (p&lt; 0.05) was significantly higher in the box. This also counts for the total density of all species, for the polychaetes and for the Amphipoda (cfr. table 5). In the discussion (see 6) a.o. a comparison is considered with data from Wolff from the period 1958-1969. From this we can conclude that sea species such as <i>Tellina fabula<\/i> have become more common in the Fore Delta. In the report a selection of the most remarkable figures is presented ; the others can be found in some appendix. (These can be consulted at the library of the NIOZ in Texel and at RWS-DGW in Middelburg).","AbstractOtherLang":"In het kader van het Voordelta-onderzoek (zie inleiding en fig. 1) is er een bodemdiereninventarisatie uitgevoerd. Er zijn 3 tochten gehouden: najaar 1984, voorjaar 1985 (1985-1) en najaar 1985 (1985-2). In dit rapport komen de dichtheden van de eerste en de tweede tocht aan de orde. In het (sublitorale) onderzoeksgebied, dat een oppervlakte heeft van ca. 1200 km\u00b2, zijn 125 soorten aangetroffen, die zijn vermeld in tabel 1. De 14 meest algemene soorten (vgl. tabellen 16 en 27) zijn: -de borstelwormen <i>Scoloplos armiger, Nephtys hombergii, Nephtys cirrosa, Magelona papillicornis, Spiophanes bombyx, Spio filicornis<\/i> en <i>Capitella capitata<\/i>; -de vlokreeftjes <i>Bathyporeia elegans<\/i> en <i>Urothoe poseidonis<\/i>; -de tweekleppigen <i>Spisula subtruncata, Tellina fabula<\/i> en <i>Macoma balthica<\/i>; -de zeester <i>Ophiura texturata<\/i> en -de groep snoerwormen (Nemertinea). De werkwijze is samengevat in figuur 2: de bemonsteringsstrategie werd aangepast aan de resultaten van de voorafgaande tocht. Bij TWINSPAN-classificatie van dichtheidsgegevens van 1984 bleek een ruimtelijke patroon te onderscheiden van, qua bodemdierensamenstelling en dichtheden, op elkaar gelijkende (64) stations. Dit maakte een strata-indeling (6 strata) op basis van bodemdierengegevens mogelijk. Bij de aanvang project kon dit op basis van de beschikbare bodem- of bodemdiergegevens nog niet gebeuren. Bij de tweede tocht is vervolgens een \"stratified random\"-bemonstering uitgevoerd om de dichtheden per stratum goed te kunnen schatten. Er zijn betrouwbaarheidsintervallen voor de geometrisch gemiddelde dichtheid berekend. De gegevens zijn log-getransformeerd, vervolgens is het gemiddelde bepaald van de waarnemingen en is deze waarde terug-getransformeerd voor de strata afzonderlijk en voor het gehele gebied (zie tabel 27, de figuren 29 t\/m 35 en de figuren van bijlage 4a). Er werd een sterke correlatie tussen de geometrisch gemiddelde dichtheid en de frequentie van de soort gevonden (zie 4 en 6). Bij de vergelijking van de TWINSPAN-classificatie van de gegevens van de eerste twee BOVO-tochten werden vergelijkbare ruimtelijke patronen ontdekt, a.h.w. stabiele zonatie (zie figuren 25 t\/m 28). De strata-indeling, die uit de tweede tocht is afgeleid en voor de derde tocht is gebruikt, is verfijnd (10 strata) t.o.v. de voorgaande strata-indeling (6 strata) op basis van de eerste tocht (zie overlays 1 en 2). De noordelijke strata (fijn zand met een laag-middelmatig slibgehalte) zijn relatief rijk aan soorten en individuen per monster (zie figuur 52 en 53). De Westerscheldemonding (met hoge slibgehaltes in de in hoofdzaak fijnzandige bodem en hoge zwevend stofgehalten in de waterkolom) en delen van de Oosterscheldemonding (waar i.v.m. hoge stroomsnelheden lage slibgelhaltes in de middelmatig grof-zandige bodem worden gevonden) lieten in 1984 en 1985-1 weinig soorten en individuen per monster zien (zie figuren 23 en 24). Per stratum wordt een abiotische beschrijving gegeven (zie 3 en tabel 9). Per soort is op grafische wijze gezocht naar correlaties met gemeten bodemfactoren en de diepte en is de ecologische verspreiding onderzocht op basis van gegevens van de tweede tocht (zie 5 en bijv. de figuren 38, 41 en 45). Op de gehele dichtheden-dataset (1984 en 1985-1 apart) is een ordinatie-techniek (DECORANA) toegepast en is gezocht naar rangorde-correlaties met de gemeten bodemfactoren en met de diepte (zie 2.5). Deze bleken statistisch significant gecorreleerd te zijn met een of meer van de DECORANA-ordinatie-assen (zie 5). Zeer hoge correlaties werden gevonden met het slibgehalte (en de groep daarmee gecorreleerde variabelen) (zie tabel 26 en fig. 49). In verband met het toepassen van verschillende technieken bij de bemonstering (Reineck-box corer en Van Veen-happer), zijn deze onderling vergeleken op penetratie-diepte en dichtheidsschattingen voor bodemdieren (zie 2). De box-corer penetreerde (gem. 26 cm) aanzienlijk dieper dan de Van Veen-happer (g","BibLvlCode":"MS","StandardTitle":"Inventarisatie van macrozoobenthos in de Voordelta: dichtheden voor de najaarstocht van 1984 en de voorjaarstocht van 1985","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2025-07-25 01:33:49.256478","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1987,"DateUpdate":"2025-07-18","DateCreate":"2001-05-21","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":9476,"ISBN":null,"PubliDate":1987,"IssueDate":null,"Volume":"1987","Issue":"1","Pagination":"36","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5697,"SerRR":"NIOZ-rapport. 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