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The taxonomic distinctness measure of biodiversity weighting of step lengths between hierarchical The taxonomic distinctness measure of biodiversity weighting of step lengths between hierarchical

The taxonomic distinctness measure of biodiversity weighting of step lengths between hierarchical - PDF document

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The taxonomic distinctness measure of biodiversity weighting of step lengths between hierarchical - PPT Presentation

showing the approximate the stud giving rise Liverpool Bay Bay study Tamar Austen Warwick 1989 with a extensive naval the large heavy metals a result mines Somerfield combined regional specie ID: 339881

showing the approximate the stud-

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Warwick: Weighting taxonomic distinctness 15.9, 37.3, 60.2, 72.2, cannot now alter the disadvantage is now a function particular richness hierarchy data set a problem because the provide a habitat studies. arguably the marine animals Warwick 1980, a variety is to the robustness ural weightings the step lengths in hierarchy. A the paper mainland faunas, between the 45 km different intertidal seaweed spe- Collections from (hydroids, polyzoans, sediments ranging Coles (1977). a variety sand beaches grade and (records in Coles 1977). study we the species recorded reasonably representative treated separately the faunas habitats: intertidal secondary substrata Here we sedimentary) habitats sandy mud 3 stations coast (Warwick sludge dumping ground, sive site environmental impact on that region, relatively slight heavily industri- sand beaches. beaches subjected Clyde at Scalpsie, Irvine Ayr Bays non-polluted according 3 stations (Stns in Irvine Ayr Bays that Lambshead Estuarine intertidal (a) The relatively pristine (b) the each category species used Remaining columns give weighting schemes used the weighted length between species belonging the 'default' step length; percentage decrease step lengths has constant step lengths but final (coarsest 33.3 37.3 showing the approximate the stud- giving rise Liverpool Bay, Bay, study) Tamar (Austen & Warwick 1989) with a extensive naval the large heavy metals a result mines (Somerfield combined regional species list for grain sizes, sediments at high spring tides). The into this mixed-habitat category, since sediment types was studied silts to coarse gravels These data habitats provide a more total this gives a lists for categories; their approximate shown in compiled from Platt al. (1998). for all ferent sets be plotted corresponding numbers taxonomic distinctness species, can 1998). The simulation sim- taxonomic distinctness in which Over a values this gives rise to the larger though, the these subset values, species, whatever the allowing quick an approximate funnel (mean time-consuming simulations. a maximum 100 for it will true that sets placing differing coarser lev- taxonomic hierarchy give differing What matters whether the between studies choices which example, between step length a variable step length based on weighting (constant genus, genus class, respectively, and standardised, give distinctness estimates either dominated pass through taxonomic level, in favour 21-29, 1999 75 76 (equal step lengths) studies, under at each towards the coarser taxonomic levels; (c) decreasing step lengths combinations; the involved (Enoplia this implies more even the spe- between them comprehensive review (compressing subclasses) in Fig. but using taxonomic hier- the subclass level, against default weights; compressing the taxonomic hierarchy of most major phyla around the the nearest recorded region, Marine Fauna (Marine Biological Associ- that species long larval the plankton depleted in, West to currents, no replenishment being suggests that expressed at a higher taxonomic level highest taxonomic higher than locations. However, this out by a lower the taxonomic distinctness no higher step lengths Taxonomic artefacts distinctness index informative in some benthic meiofaunal, groundfish studies 1995, 1998, variance formulae a hypothesis testing framework. (1998) discussed relevance as On the strength sensitivity to disturbance events species-level richness or now a taxonomic distinctness more sensitive This fact best way detecting subtle all, but testing methods be sensitive modest differences habitat type, traditional univariate measures, though their own species richness that robustness properly claimed not sensitivity few (or no) species in common, using natural use valid form the use field or studies, returning quantitative species natural question taxonomic distinctness the index the Linnean defines tax- course, the a Linnean classification. genetic distance Nei 1996) a soundly combining molecular more traditional mor- classification clearly gives a dis- continuous distinctness it is the step lengths taxonomic levels values that index takes across it is legitimate concern that phyletic distinctness analysis could a simple major phyla because the whose presence (phylogenetically) diverse a lower level. concentrated in single, reasonably the marine research questions the extent well-studied organisms potential scale ferences in (note that this could taxonomic distinctness index within a species inventory); taxonomic levels (e.g. subgenera, a 13-level taxonomic question that arises fact, the existence a wide-scale inventory is not step lengths taxonomic distinctness PJ, Olsgard further examina- taxonomic distinctness marine nematode In: Keegan benthic organisms. Pergarnon, Ox- the nematode some meth- J Mar reveal a in taxonomic distinctness ing stress. Mar Prog Ser (1998) Taxonomic distinctness RM, Platt Somerfield PJ (1998) Monhystenda. Syn- Studies Council, Submitted: October