Full annual cycle bioenergetics model of migration applied to Galapagos tortoises—Data
Data for journal manuscript: Benefits of the destinations, not costs of the journeys, shape partial migration patterns
Dates
Publication Date
2017-04-10
Start Date
2010-02-01
End Date
2011-01-31
Citation
Yackulic, C.B., Blake, Stephen, and Bastille-Rousseau, Guillaume, 2017, Full annual cycle bioenergetics model of migration applied to Galapagos tortoises—Data: U.S. Geological Survey data release, https://doi.org/10.5066/F7154F7P.
Summary
Ambient-shade temperature was measured every 4 h with iButton thermochrons (Maxim Integrated Products, Inc., Sunnyville, CA, USA) placed at 1m above-ground level for a previous paper (Blake et al., 2012 – DOI 10.1111/1365-2656.12020). The Normalized Difference Vegetation Index (NDVI) of the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument (Huete et al. 2002 - http://dx.doi.org/10.1016/S0034-4257(02)00096-2) was used as an index of vegetation quantity. Monthly average NDVI values within the range of each tortoise population were derived based on grid sampling within the convex hull created by upland and lowland relocations of migratory individuals during their sedentary (non-migratory) phases of movement. We linearly [...]
Summary
Ambient-shade temperature was measured every 4 h with iButton thermochrons (Maxim Integrated Products, Inc., Sunnyville, CA, USA) placed at 1m above-ground level for a previous paper (Blake et al., 2012 – DOI 10.1111/1365-2656.12020). The Normalized Difference Vegetation Index (NDVI) of the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument (Huete et al. 2002 - http://dx.doi.org/10.1016/S0034-4257(02)00096-2) was used as an index of vegetation quantity. Monthly average NDVI values within the range of each tortoise population were derived based on grid sampling within the convex hull created by upland and lowland relocations of migratory individuals during their sedentary (non-migratory) phases of movement. We linearly interpolated between monthly values to create daily values. The other data (hmat) is a matrix with the time of data corresponding to the temperature data. All data cover the period Feb. 1, 2010 to Jan. 31, 2011 and were originally presented in Blake et al. (2012 – DOI 10.1111/1365-2656.12020), but are required for the model presented here.
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Related External Resources
Type: Related Primary Publication
Yackulic, C.B., Blake, S., and Bastille-Rousseau, G., 2017, Benefits of the destinations, not costs of the journeys, shape partial migration patterns: Journal of Animal Ecology v. (online), doi: 10.1111/1365-2656.12679, https://dx.doi.org/10.1111/1365-2656.12679.
The purpose of these data were to test hypotheses about the drivers of partial migration in Galapagos tortoises and develop a bioenergetics model of movement, so as to better understand how migratory behavior and ultimately populations respond to current climate variation, and predict responses to future climate scenarios. In this context we collected temperature and NDVI data to characterize conditions in the lowland and highland habitats of two partial migratory populations of Galapagos tortoises on Santa Cruz Island, as well as temperature in the transition zone between the upland and lowlands that tortoises migrate through.
Rights
The authors of these data require that data users contact them regarding intended use and to assist with understanding limitations and interpretation. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.
