The "Cambrian substrate revolution" or "Agronomic revolution", evidenced in trace fossils, is the diversification of animal burrowing during the early Cambrian period. Before this "widening of the behavioural repertoire", bottom-dwelling animals mainly grazed on the microbial mats that lined the surface, crawling above (like how freshwater snails still do) or burrowing just below them. These microbial mats created a barrier between the water and the sediment underneath, which was less water-logged than modern sea-floors, and almost completely anoxic (lacking in oxygen). As a result, the substrate was inhabited by sulfate-reducing bacteria, whose emissions of hydrogen sulfide (H2S) made the substrate toxic to most other organisms.
| Attributes | Values |
|---|
| rdf:type
| |
| rdfs:label
| - Cambrian substrate revolution (en)
- Kambriska agrara revolutionen (sv)
|
| rdfs:comment
| - Kambriska agrara revolutionen I övergången mellan ediacara och kambrium sker en förändring i bottenlevande djurs livsmönster. Under ediacara fanns inga livsformer som grävde djupt i bottensediementet de flesta begränsade sig till att leva på, i eller strax under den tunna microbiologiska matta som täckte stora delar av havsbotten i deras livsmiljöer. Dessa livsmiljöer är ofta mycket extrema med hög salthalt i det omgivande vattnet eller begränsad näringstillgång som till exempel låga halter av fosfor. Liknande livsmiljöer går fortfarande att finna i begränsad omfattning i bl.a. Australien. Under kambrium var det betydligt vanligare att djuren grävde sig ner på djupet i bottensediementet vilket kan bero på förändringar i födotillgången eller behovet av att gömma sig för predatorer. (sv)
- The "Cambrian substrate revolution" or "Agronomic revolution", evidenced in trace fossils, is the diversification of animal burrowing during the early Cambrian period. Before this "widening of the behavioural repertoire", bottom-dwelling animals mainly grazed on the microbial mats that lined the surface, crawling above (like how freshwater snails still do) or burrowing just below them. These microbial mats created a barrier between the water and the sediment underneath, which was less water-logged than modern sea-floors, and almost completely anoxic (lacking in oxygen). As a result, the substrate was inhabited by sulfate-reducing bacteria, whose emissions of hydrogen sulfide (H2S) made the substrate toxic to most other organisms. (en)
|
| differentFrom
| |
| foaf:depiction
| |
| dcterms:subject
| |
| Wikipage page ID
| |
| Wikipage revision ID
| |
| Link from a Wikipage to another Wikipage
| |
| Link from a Wikipage to an external page
| |
| sameAs
| |
| dbp:wikiPageUsesTemplate
| |
| thumbnail
| |
| has abstract
| - The "Cambrian substrate revolution" or "Agronomic revolution", evidenced in trace fossils, is the diversification of animal burrowing during the early Cambrian period. Before this "widening of the behavioural repertoire", bottom-dwelling animals mainly grazed on the microbial mats that lined the surface, crawling above (like how freshwater snails still do) or burrowing just below them. These microbial mats created a barrier between the water and the sediment underneath, which was less water-logged than modern sea-floors, and almost completely anoxic (lacking in oxygen). As a result, the substrate was inhabited by sulfate-reducing bacteria, whose emissions of hydrogen sulfide (H2S) made the substrate toxic to most other organisms. Around the start of the Cambrian, organisms began to burrow vertically, forming a great diversity of different fossilisable burrow forms as they penetrated the sediment for protection or to feed.These burrowing animals broke down the microbial mats, and thus allowed water and oxygen to penetrate a considerable distance below the surface. This restricted the sulfate-reducing bacteria and their H2S emissions to the deeper layers, making the upper layers of the sea-floor habitable for a much wider range of organisms. The upper level of the sea-floor became wetter and softer as it was constantly churned up by burrowers. (en)
- Kambriska agrara revolutionen I övergången mellan ediacara och kambrium sker en förändring i bottenlevande djurs livsmönster. Under ediacara fanns inga livsformer som grävde djupt i bottensediementet de flesta begränsade sig till att leva på, i eller strax under den tunna microbiologiska matta som täckte stora delar av havsbotten i deras livsmiljöer. Dessa livsmiljöer är ofta mycket extrema med hög salthalt i det omgivande vattnet eller begränsad näringstillgång som till exempel låga halter av fosfor. Liknande livsmiljöer går fortfarande att finna i begränsad omfattning i bl.a. Australien. Under kambrium var det betydligt vanligare att djuren grävde sig ner på djupet i bottensediementet vilket kan bero på förändringar i födotillgången eller behovet av att gömma sig för predatorer. (sv)
|
| gold:hypernym
| |
| prov:wasDerivedFrom
| |
| page length (characters) of wiki page
| |
| foaf:isPrimaryTopicOf
| |
| is Link from a Wikipage to another Wikipage
of | |
![[RDF Data]](/fct/images/sw-rdf-blue.png)
![[cxml]](/fct/images/cxml_doc.png)
![[csv]](/fct/images/csv_doc.png)
![[text]](/fct/images/ntriples_doc.png)
![[turtle]](/fct/images/n3turtle_doc.png)
![[ld+json]](/fct/images/jsonld_doc.png)
![[rdf+json]](/fct/images/json_doc.png)
![[rdf+xml]](/fct/images/xml_doc.png)
![[atom+xml]](/fct/images/atom_doc.png)
![[html]](/fct/images/html_doc.png)
