DOI: 10.5061/dryad.bk3j9kd8t
title: Temperature-dependent competitive outcomes between the fruit flies Drosophila santomea and D. yakuba

description: We use these data to test whether temperature can indirectly affect the
 fitness of Drosophila santomea and D. yakuba by altering interspecific
 competitive outcomes. We show that, when raised in isolation, both D.
 santomea and D. yakuba display similar variation in relative fitness
 across temperatures of 18°C, 22°C, and 25°C. However, D. santomea has
 higher fitness than D. yakuba when experiencing interspecific competition
 at 18°C, while the inverse is true at 25°C. Patterns of fitness across
 thermal and competitive environments therefore indicate that the outcome
 of interspecific competition varies with temperature. We then use a
 ‘coexistence’ experiment to show that D. santomea is rapidly (within 8
 generations) extirpated when maintained with D. yakuba at 25°C. By
 contrast, D. santomea remains as (or more) abundant than D. yakuba over
 the course of ~10 generations when maintained at 18°C. Results provide an
 example of how the thermal environment can affect interspecific
 competition and suggest that some species may become more prone to
 extinction under scenarios of climate change through indirect effects of
 the thermal environment on competitive advantages between species.
description: Raw count data were collected in the lab.
 Climate data were downloaded (bioclim variables) or recorded
 using Senonics Minnow 1.0TH data loggers. All data
 given are raw data. Associated scripts used to process and analyze those
 data are also provided.
description: ## README file for data / scripts associated with the
 manuscript:<br> ## "Temperature-dependent competitive outcomes
 between the fruit flies Drosophila santomea and D. yakuba"
 <br> File name: analyze_climate_bioclim.R<br>
 Description: R script used to analyze bioclim data covering the island of
 Sao Tome; Associated data files: data_abundance_san_yaK_F1s.csv,
 data_coordinates_yakuba_included.csv File name:
 analyze_climate_dataloggers.R<br> Description: R script used to
 analyze temperature data collected using data loggers; Associated data
 files: saotome_TempHumid_data.zip File name:
 analyze_competition_cages.R<br> Description: R script use to analyze
 counts of D. santomea and D. yakuba within each cage set up for the
 multi-generational experiment; Associated data files:
 data_competition_cages.txt File name:
 analyze_within_gen.R<br> Description: R script used to analyze
 counts of D. santomea and D. yakuba eclosing at different temperatures in
 the single-generation competition experiment; Associated data files:
 data_within_gen.txt File name:
 data_abundance_san_yaK_F1s.csv<br> Description: Data table with
 counts of D. santomea, D. yakuba, and their two hybrids sampled along an
 elevational transect on Sao Tome. Altitude field is the sites elevation
 above sea level in meters. File name:
 data_competition_cages.txt<br> Description: Data table containing
 counts of D. santomea, D. yakuba, and potential hybrids collected over the
 course of the multigenerational competition experiment. Each unique cage
 is identified by the temp and rep fields. The date the cages were sampled
 is also given.  File name:
 data_coordinates_yakuba_included.csv<br> Description: Data table
 containing coordinates for each site along the elevational transect on Sao
 Tome. This table also presents the more abundant species, D. santomea or
 D. yakuba, at each site. File name:
 data_ficus_emergence.csv<br> Description: Data table containing
 counts of different drosophilids eclosing from three species of fig
 sampled from the forest floor on Sao Tome. File name:
 data_within_gen.txt<br> Description: Data table containing counts of
 D. santomea and D. yakuba eclosing over the course of the
 single-generation competition experiment. File name:
 saotome_TempHumid_data.zip<br> Description: archive containing data
 tables of temperature values recorded across 8 sits on Sao Tome in
 February 2018.