Anguilla data: Anguilla australis distribution data

Description

A number of sites with presence or absence of the short-finned eel (Anguilla australis) in New Zealand, and environmental data at these sites; and gridded data of the environmental variables for the study area.

type	variable name	values
mean and range	Reach	LocSed
weighted average of proportional cover of bed sediment	1=mud, 2=sand, 3=fine gravel; 4=coarse gravel; 5=cobble; 6=boulder; 7=bedrock; 3.77, 1 to 7	Segment
SegSumT	Summer air temperature (degrees C)	16.3, 8.9 to 19.8
	SegTSeas	Winter air temperature (degrees C), normalised with respect to SegJanT
0.36, -4.2 to 4.1		SegLowFlow
segment low flow (m3/sec), fourth root transformed	1.092, 1.0 to 4.09	Downstream
DSDist	distance to coast (km)	74, 0.03 to 433.4
	DSDam	presence of known downstream obstructions, mostly dams
0.18, 0 or 1		DSMaxSlope
maximum downstream slope (degrees)	3.1, 0 to 29.7	Upstream / catchment
USAvgT	average temperature in catchment (deg C) compared to segment, normalised with respect to SegJanT	-0.38, -7.7 to 2.2
	USRainDays	days/month with rain greater than 25 mm
1.22, 0.21 to 3.30		USSlope
average slope in the upstream catchment (degrees)	14.3, 0 to 41.0
USNative	area with indigenous forest (proportion)	0.57, 0 to 1
	Fishing method	fishing method in five classes: electric, net, spot, trap & mixture
NA	type	variable name

Usage

data(Anguilla_train)
data(Anguilla_test)
data(Anguilla_grids)

Arguments

References

Elith, J., J.R. Leathwick and T. Hastie, 2009. A working guide to boosted regression trees. Journal of Animal Ecology 77: 802-81