ResourcesByNode: Resources and consumers of nodes

In cheddar: Analysis and Visualisation of Ecological Communities

Resources and consumers of nodes

Description

Functions that return the resources and consumers of nodes.

Usage

ResourcesByNode(community) 
ConsumersByNode(community) 
ResourcesAndConsumersByNode(community)

ResourcesOfNodes(community, nodes) 
ConsumersOfNodes(community, nodes) 

TrophicLinksForNodes(community, nodes, node.properties=NULL, 
                     link.properties=NULL) 

Arguments

community	an object of class Community.
nodes	either the names or integer indices of nodes.
node.properties	passed to TLPS.
link.properties	passed to TLPS.

Details

ResourcesByNode/ConsumersByNode/ ResourcesAndConsumersByNode all return a list of length NumberOfNodes; list elements are names of nodes that are resources/consumers/resources and/or consumers.

If nodes is of length one then ResourcesOfNodes and ConsumersOfNodes return a vector of resources / consumers. If nodes contains more than one value, then a list of vectors is returned.

TrophicLinksForNodes returns a data.frame containing the columns ‘resource’ and 'consumer' and a row for each trophic link in-to and out-of nodes.

Value

Either a vector, a list or a data.frame

Author(s)

Lawrence Hudson

See Also

TLPS, PredationMatrix, NumberOfNodes

Examples

data(TL84)

# A list containing a vector of resources for each node.
ResourcesByNode(TL84)

# A vector of resources of 'Umbra limi'
ResourcesOfNodes(TL84, 'Umbra limi')

# A vector of resources of 'Umbra limi'
ResourcesOfNodes(TL84, 56)

# A list containing vectors of resources for nodes 50:56
ResourcesOfNodes(TL84, 50:56)

# A data.frame containin columns resource and consumer
TrophicLinksForNodes(TL84, 'Umbra limi')

# A data.frame containin columns resource, consumer, resource.M and consumer.M
TrophicLinksForNodes(TL84, 'Umbra limi', node.properties='M')

cheddar documentation built on Sept. 11, 2024, 5:16 p.m.