View source: R/community_trophic_links.R
Degree | R Documentation |
The number of trophic links in to and out of nodes in a
Community
.
Degree(community) InDegree(community) TrophicGenerality(community) NumberOfResources(community) OutDegree(community) TrophicVulnerability(community) NumberOfConsumers(community) NormalisedTrophicGenerality(community) NormalisedTrophicVulnerability(community)
community |
an object of class |
InDegree
and OutDegree
return the number of trophic
links in-to and out-of each node. Degree
returns InDegree
+
OutDegree
. TrophicGenerality
and NumberOfResources
are synonyms for InDegree
. TrophicVulnerability
and
NumberOfResources
are synonyms for OutDegree
.
NormalisedTrophicGenerality
and NormalisedTrophicVulnerability
return the containing the number of resources and consumer of each node,
normalised with respect to LinkageDensity
. The mean of the values
returned by both NormalisedTrophicGenerality
and
NormalisedTrophicVulnerability
is 1, making their standard
deviations comparable across different food webs.
A vector of length NumberOfNodes
.
Lawrence Hudson
Williams, R.J. and Martinez, N.D. (2000) Simple rules yield complex food webs. Nature 404, 180–183.
Community
, NumberOfNodes
,
LinkageDensity
, DirectedConnectance
,
DegreeDistribution
data(TL84) d <- Degree(TL84) i <- InDegree(TL84) o <- OutDegree(TL84) # This equality is always TRUE for all food webs all(d == i+o) ntg <- NormalisedTrophicGenerality(TL84) mean(ntg) # Equals 1 ntv <- NormalisedTrophicVulnerability(TL84) mean(ntv) # Equals 1
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