9 Meiofaunal Ecology - Meiofaunal Ecology I Zonation I...

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Unformatted text preview: Meiofaunal Ecology I Zonation I Dispersion & Patchiness I Ecological Role Zonation (Vertical) 1' By depth in sediment: f (less 02 tnlernnee, enrytnpie nature, grasing, fend resnnrees, reenlnnisntinn, sensnn, dessientinn sensitivity). 1' Man}r nleinfanna migrate tn fnllnw the water with ebbing tides and flnnding tides. The extent nf this rnnndtrip migratinn depends npnn sensnn and day I night eyeles. ' Vertienl segregatinn rednees ennlpetitinn Zonation (Horizontal) I Esanlples include a) Salinity gradient in estuary, h) aeress intertidal sand 3: mad habitats, and e) ever distance and depth gradients I Sandy intertidal habitats {MeLaehlan 1931]) a) Dry sand snh stratum ($50“qu desieated), h) Meist sand snhstratlnn (iififlflx’e, high [12), e) Water tahle snh str atnnl (wet, nlederate DE), d) Deep lessr [12 sub str atlnn I Muddy intertidal Generalists vs 311 eeialist 43:; hahitat partitiening by space Patchiness & Dispersion - Meiefsune are very patchy in distributien - Patehiness eeeurs e11 varied scales —meere (km) mese (n1) miere (e111) —Physiesl 8c Geelegieel I Bielegieel - Miereseale patehiness (same as plankten) is theught te be ssseeiated with patchy feed reseurees, biegenie structures, disturbaneeJr‘r predatien events, and repreduetive events Dispersal Phenomenon - Mest adaptatiens seem te be geared tewards maintaing sedentary existence but many taIa have a eesmepelitan distrubntien. Herr se? —Plate Teetenies (leng term temperal) —Airberne animals —Rafting en drifting materials —Snspensien events — Ballast trans pert Ecological Roles *- What do meiofauna feed upon *- Are they a food source for higher trophie levels Food of Meiofauna I Same meiefauna are predatery (i.e., Turbellarians) I Same meiefauna prefer haeteria wheras ethers prefer diatems (predictable hased upen hueeal merphelegy) I Diatem feeders are effen nan—selective I Many farms preduee mueus which help te trap er culture mierehes I Isetepe studies have revealed that 1% ef diatems and 3% efhaeteria can he grazed per hear by meiefauna in marsh lauds Meiofanna as Food - Answering the qnestinn at whether nleinfanna are gnnd fend far larger nrganislns depends in part nn their rate at seenndary prndnetinn - Answer is that nieinfanna per unit mass are ea. 5}: ninre prntlnetire than the niaernfanna - Usually the Maern I Meir: hinniass ratins are greater than 5:1 but in shallnw nlndilats and the deep sea this ratin may apprnaeh 1. Evidence of Meiofanna as Food '- Fish and Invert gnt enntent analysis has revealed nleinfanna in gnts *- Cnpepnds appear tn be highly selected by many fishes *- Meinfanna nlnre impartant in muddy than in sandy sedinlents. Why? ...
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9 Meiofaunal Ecology - Meiofaunal Ecology I Zonation I...

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