Bio%20201%20S12%20Lect%2016%20%28True%29%20v2

Bio%20201%20S12%20Lect%2016%20%28True%29%20v2 - Biology in...

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Biology’in’the’News’ (see’folder’on’BB)’ All’organisms’need’iron’for’their’metabolism’ and’growth’ On’the’sea’floor,’it’has’recently’been’found’ that’pyrite’(fool's’gold;’iron’disulFde’±eS2;’ ±e2+S22−)’from’hydrothermal’vents’is’an’ important’source’of’iron’for’the’communiGes’ there’ pyrite’parGcles’from’the’vents’are’very’small’ (1/1000’the’diameter’of’a’human’hair)’and’ they’stay’dissolved’(suspended)’in’the’ocean’ water’rather’than’seKling’ can’travel’very’far’in’ocean’currents’and’does’ not’react’quickly’with’oxygen’like’other’ forms’of’iron;’stays’accessible’to’organisms’ for’a’long’Gme’by’oxidizing’gradually’ hKp://www.nsf.gov/news/news_summ.jsp? cntn_id=119431&WT.mc_id=USNS±_51&WT. mc_ev=click’
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but’sGll’lots’of’scaKer’ other’factors?’
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introduced’and’invasive’species’can’reach’very’ high’densiGes’
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populaGons’are’usually’subdivided’ the’ subpopula(ons of’a’ populaGon’make’up’a’ metapopula(on individuals’move’between’ them’at’various’rates’ subpopulaGons’may’occupy’ patches ”’ in’some’patches,’subpopulaGons’ may’come’close’to’or’actually’go’ exGnct’ these’may’be’rescued’ (“rescue’eFect”)’by’ immigrants’from’other’ patches’
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the’importance’of’patch’size’and’connecGons’ between’patches’
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migratory’species’(especially’birds):’ occupy’distant’habitats’at’diferent’Gmes’oF’year’ events’in’one’habitat’can’ have’efects’on’the’ populaGon’that’are’seen’ in’the’other’habitat’ spread’oF’ Brassica’ rapa (oilseed’rape)’in’England’ caused’some’species’(e.g.’ wood’pigeon)’to’increase’ but’drought’in’West’AFrica’ wintering’grounds’had’ devastaGng’efects’
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Bio%20201%20S12%20Lect%2016%20%28True%29%20v2 - Biology in...

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