10.5061/DRYAD.478KP63
Sheehy, Emma
University of Aberdeen
Sutherland, Chris
University of Massachusetts Amherst
O'Reilly, Catherine
Waterford Institute of Technology
Lambin, Xavier
University of Aberdeen
Data from: The enemy of my enemy is my friend: native pine marten recovery
reverses the decline of the red squirrel by suppressing grey squirrel
populations
Dryad
dataset
2018
apparent competition
Martes martes
Sciurus vulgaris
spatial capture recapture
Species interactions
Sciurus carolinensis
Occupancy Modelling
predator mediated competition
pest-regulating ecosystem service
2018-02-16T14:10:55Z
2018-02-16T14:10:55Z
en
https://doi.org/10.1098/rspb.2017.2603
82546 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Shared enemies may instigate or modify competitive interactions between
species. The dis-equilibrium caused by non-native species introductions
has revealed that the outcome of such indirect interactions can often be
dramatic. However, studies of enemy mediated competition mostly consider
the impact of a single enemy, despite species being embedded in complex
networks of interactions. Here we demonstrate that native red and invasive
grey squirrels in Britain, two terrestrial species linked by resource and
disease-mediated apparent competition, are also now linked by a second
enemy-mediated relationship involving a shared native predator recovering
from historical persecution, the European pine marten. Through combining
spatial capture recapture techniques to estimate pine marten density, and
squirrel site occupancy data, we find that the impact of exposure to
predation is highly asymmetrical, with non-native grey squirrel occupancy
strongly negatively affected by exposure to pine martens. In contrast,
exposure to pine marten predation has an indirect positive effect on red
squirrel populations. Pine marten predation thus reverses the
well-documented outcome of resource and apparent competition between red
and grey squirrels.
Pine marten encounter histories for use in SCR analysis using oSCR package
in RData collected in the field and processed in lab to obtain genotypes.
id= pine marten id/genotype, occasion = visit (1-5), trapid = detector
name, sex = f/m, session = region name, site = name of cluster in which
detector was locatedSheehy_et_al_Data_S9_enc_ESM.csvPine marten trap
locations and operational data for use with oSCR packagePine marten
detector data relating to location of detectors and whether they were
operational. X = British National Grid easting, Y = British National Grid
northing, o1-o5 = whether detector was operational for each session, site
= name of cluster which detector belongs to, region = LL (Central
Scotland), BO (Borders) or HI
(Highlands)Sheehy_et_al_Data_S10_traps_ESM.csvRed squirrel detection
histories and covariates for occupancy analysis in UNMARKED R
packageDetection/non-detection data site and survey specific covariates
for red squirrels. 0=name of cluster which detector belongs to, region =
CS (Central Scotland), BO (Borders) and HI (Highlands), X = BNG easting,
Y= BNG northing, species = red squirrel, visit1-5 = detection (1) /non
detection (0), cover = % of 100m buffer which is forested, bl = % of cover
which is broadleaved, gs = portion of feeders within 500m used by grey
squirrels, tCov1-tCov5 = hair (feeder only used) or both (feeder and
camera used)Sheehy_et_al_Data_S11_detections_red_ESM.csvGrey squirrel
detection histories and covariates for use in occupancy analysis using
UNMARKED R packageSame as red squirrel detection history file except
species = grey squirrelSheehy_et_al_Data_S12_detections_grey_ESM.csv
Scotland