{"refrec":{"BRefID":250878,"RR":"<b>Pepping, M.; Piersma, T.; Pearson, G.; Lavaleye, M.S.S.</b> (1999). Intertidal sediments and benthic animals of Roebuck Bay, Western Australia. <i>NIOZ-rapport</i>, 1999-3. NIOZ: Texel.  212 pp.","BEntID":242573,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>NIOZ-rapport</i>, 1999-3. NIOZ: Texel.  212 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Pepping, M.; Piersma, T.; Pearson, G.; Lavaleye, M.S.S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Pepping, M. <i>et al.</i>","Englishabstract":"Roebuck Bay near Broome (NW Australia) is with itsextensive tidal flats one of the foremost internationallyimportant sites for shorebirds in the Asia-Pacificflyway system. It is home to 150,000 shorebirds (or‘waders’) in the nonbreeding season, which suggeststhat the intertidal flats of the bay have abundantinvertebrate food to offer. To answer the question whyand how so many birds are able to make a living in themud of Roebuck Bay, about a quarter of the intertidalarea was quantitatively sampled for benthic animals inJune 1997 by a team of about 30 volunteers andprofessionals. For a series of 12 successive days atalmost every low tide 2-4 three-person teams walkedparts of the study area. In addition there was a twoperson Hovercraft team working the outlying sites. Tothe best of our knowledge, this is the first detailedmapping of benthic biodiversity on tropical intertidalmudflats. Covering the entire northem shore ofRoebuck Bay, benthos and sediment cores were takenat more than 500 stations laid out in a gridlike fashionwith intersections every 200 m. Each sampling stationyielded a list of invertebrate species, along with theirnumber and sizes, and a value for median gram size ofthe sediment. Most molluscs and many crustaceanswere sorted to species (even though many of thesespecies are presently unknown to science and needformal description). All worms (including thepolychaetes, but also groups such as phoronids,nemertines and sipunculids) were sorted and countedto family level (polychaetes) or at least to the phylumlevel (e.g. phoronids and nemertines). A total of 161taxa were identified from the quantitative samples;another 30 taxa were discovered opportunistically. Theactual number of species within the different habitatsof Roebuck Bay will be much higher, because first ofall, most of the animals were identified to highertaxonomic levels, and secondly, no samples weretaken from rocky habitats and within the mangals. Thetotal density of macrobenthic animals retained on a 1-mm sieve was 1,287 ind./m 2.The polychaete familiesChaetopteridae and Oweniidae dominated the fauna interms of abundance and biomass. The 20 mostabundant taxa made up more than 90% of the totalnumbers. Many rare taxa occurring at less than 2% ofthe stations were found. Polychaetes were most abundant with 70% of the individuals, followed by bivalves(12.5%), crustaceans (8%), brittle stars (4.2%), andgastropods (2.5%). All the remaining taxa amounted toonly 2%. In terms of biomass polychaetes contributeda lower proportion (45.4%). Thefew large sipunculidsmade up 23%, followed by bivalves (16.3%),crustaceans (10.5%), and gastropods (3%). Brittlestars, though high in number, made up only 0.4 % ofthe biomass. Thus, the macrobenthic invertebratefauna is very diverse, a feature quite typical for biotain the Indo-Pacific region. However, only 10% of thetaxa could be confidently assigned a species namewithin the three months of volunteer specialist’s workallotted to this aspect. This large proportion impliesthat we have only scratched the surface of describingtrue biodiversity in Roebuck Bay. Clear verticalzonation pattems of faunal assemblages were notobvious and were probably veiled by other factors.Gastropods and bivalves were characteristic of theupper intertidal areas independent of gram size. Themid- and lower intertidal areas were numericallydominated by polychaetes in the sandier regions, butbivalves prevailed in muddy substrates. At the earliestpossible occasion, in October 1997, the shorebirdswere mapped over the surveyed area. For shorebirdspecies following the tideline, such as the two knotspecies (Red Knot Calidris canutus and Great Knot C.tenuirostris) and the two godwit species (Bar-tailedGodwit Limosa lapponica and Black-tailed Godwit L.limosa), it was rather difficult to find associationsbetween their occurrence and the densities of preferredprey. Presumably these prey behave in ways that makethem more easily detectable near the sea-edge thanelsewhere. Studies on the burying behaviour of threebivalve species demonstrate that behavioural featureslinked to seawater movements may indeed beimportant in determining their availability asshorebird-food. The concentration of speciesspecialized in feeding on large crabs and mudskippers(Eastern Curlew Numenius madagascariensis,Whimbrel Numenius phaeopus, and to a lesser extentGreenshank Tringa nebularia) on the soft and muddysediments in the northeast comer of Roebuck Baycoincided nicely with the distribution of theirpresumed prey.","AbstractOtherLang":"Roebuck Bay, dat vlakbij Broome in noordwestAustralië is gelegen, is met zijn uitgestrekte getijdegebieden een van de belangrijkste internationalesteltlopergebieden in de Aziatisch-Pacifischetrekroute. In deze baai overwinteren 150,000steltiopers, hetgeen suggereert dat de wadpiaten vanRoebuck Bay rijk aan vogelvoedsel zijn. Om de vraagte kunnen beantwoorden waarom en hoe zoveel vogelshun kostje op het wad van Roebuck Bay bij elkaarkunnen scharrelen, heeft een internationale groepvrijwilligers in juni 1997 een kwart van de wadplatenkwantitatief bemonsterd op dieren die op en in debodem leven. Op 12 achtereenvolgende dagen werdentijdens laagwater delen van het studiegebiedbemonsterd door kleine teams van 2-4 personen.Daarnaast werd er gewerkt met een 2-persöonsHovercraft om de moeilijk begaanbare plekken tebemonsteren. Zover wij weten, is dit de eerstegedetailleerde gridbemonstering van een tropischgetijdegebied. Het grid bestond uit meer dan 500stations die 200 m uit elkaar lagen en bedekte degehele noordelijke deel van het wad van Roebuck Bay.Op ieder station werden benthos- en sedimentmonstersgenomen. De monsters werden meteen uitgezocht enzo verkregen we van ieder station de aantallen engrootteverdeling van alle benthische organismen. Inhet laboratorium werd later de korreigrootteverdelingvan alle sedimentmonsters bepaald. De meesteweekdieren en veel kreeftachtigen werden uitgezochttot op soortsniveau (alhoewel van het gros van desoorten de wetenschappelijke naam onbekend isgebleven; veel organismen zullen nog nietwetenschappelijk zijn beschreven). Alle wormen(inclusief de borstelwormen, maar ook groepen zoalsphoroniden, nemertijnen en sipunculiden) werden inhet beste geval tot op familie niveau (borstelwormen),maar verder tot op het niveau van hoofdgroepen(phyla) op naam gebracht (bijvoorbeeld de phoronidenen nemertijnen). In totaal zijn er in de monsters 161verschillende taxa gevonden. Buiten dezekwantitatieve monstering om werden nog ca. 30andere benthische taxa genoteerd. Het werkelijkeaantal benthische soorten van Roebuck Bay zal zekergroter zijn dan 200, omdat de meeste groepen dierendoor ons niet tot op soortsniveau zijn uitgezocht en webovendien de rots- en mangrove- habitats in degetijdezone niet hebben bemonsterd. Op het wadbedroeg de gemiddelde totale dichtheid aanmacrofauna 1 ,287 individuenlm 2.De borstelwormenfamilies Chaetopteridae en Oweniidae domineerden debodemfauna in termen van aantallen en biomassa. De20 meest voorkomende taxa waren verantwoordelijkvoor meer dan 90% van de totale aantallen. Erkwamen dus ook veel zeldzame soorten voor. Bijna dehelft van de taxa kwamen op minder dan 2% van debemonsterde stations voor. Op het klasse-niveau warende borstelwormen (70% van de individuen) het meesttalrijk, gevolgd door de tweekleppige schelpdieren(12.5%), lcreeftachtigen (8%), slangsterretjes (4.2%)en slakken (2.5%). Al de overige taxa zorgen voor delaatste 2%. Wat betreft biomassa was de dominantievan de borstelwormen niet zo sterk (45.5%). De grotesipunculiden zorgden voor 23% van de totalebiomassa, gevolgd door de tweekleppige schelpdieren(16.3%), kreeftachtigen (10.5%) en weekdieren (3%).Alhoewel slangsterretjes in hoge aantallenvoorkwamen, droegen ze slechts voor 0.4% bij aan debiomassa. De verspreiding van de belangrijkste taxawas erg ongelijk. De zoneringspatronen warentamelijk vaag, maar niettemin lijken slakken entweekleppigen karakteristiek te zijn voor de hogeredelen van het wad, onafhankelijk van korrelgrootte.Op het lage en middelhoge zandige wad domineerdende borstelwormen, maar op de modderige delendomineerden de tweekleppigen. Enkele maanden na debemonstering, in oktober 1997, werden in hetzelfdegebied de steltlopers in kaart gebracht. Voor steltlopersdie de waterlijn volgen en hoofdzakelijk langs de randvan de zee foerageren (de twee kanoet-soortenCalidris canutus en C. tenuirostris en de twee gruttosoortenLimosa lapponica en L. limosa) was hetmoeilijk om verbanden te vinden tussen hunvoorkomen en de dichtheden van hun voorkeursprooisoorten. Waarschijnlijk gedragen hun prooien zichzodanig dat ze makkelijker vangbaar zijn als op hetwad een laagje water staat. Inderdaad gavenobservaties van het ingraafgedrag van drie soortentweekleppigen aan dat de droogte van het substraathun aktiviteiten in belangrijke mate beinvloed.Steltlopersoorten die vooral grote krabben ensljkspringers aten (oosterse wulp Numeniusmadagascariensis, regenwulp Numenius phaeopus engroenpootruiter Tringa nebularia) kwamen alleen voorwaar hun prooien in grote dichtheden voorkwamen,namelijk op de zachte modderige wadplaten in denoordoost hoek van Roebuck Bay.","BibLvlCode":"MS","StandardTitle":"Intertidal sediments and benthic animals of Roebuck Bay, Western Australia","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1999,"DateUpdate":"2019-09-02","DateCreate":"2015-11-04","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":250878,"ISBN":null,"PubliDate":1999,"IssueDate":null,"Volume":"1999-3","Issue":null,"Pagination":"212","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5697,"SerRR":"NIOZ-rapport. 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