DOI: 10.5061/dryad.6m905qg4h
title: Data from: Chilean fish body size is influenced by multiple drivers

description: There is evidence that organisms have become smaller during the past
 periods of global warming. Global change has substantial effects on
 biodiversity, with body size reduction being the third most common
 response to global warming. Body size allometry in ectotherms needs to be
 explored further; the objectives of this study were to better understand
 the mechanisms regulating body size in fish by testing: i) Bergmann’s rule
 with temperature and elevation, ii) additional environmental drivers, iii)
 the role of isolation, iv) ecoevolutionary hypotheses comparing native and
 exotic species, and v) the role of migration propensity in comparing
 migratory and resident species. We analyzed an extensive dataset of
 Chilean fish composed of 75,198 records which included 25 species from 12
 different families between latitudes -28.80 to -51.42 using linear mixed
 models to discern the best environmental variables contributing to body
 size changes, as well as incorporating factors related to dispersal
 capabilities, biogeographic isolation, and levels of exotic/native
 interactions. Bergmann’s rule is supported by changes in elevation, and
 our study shows that freshwater fish body size also increases with
 increasing environmental heterogeneity and productivity. In general,
 inland native fish tend to be smaller than coastal ones, supporting the
 island rule with evidence of gigantism or dwarfism in selected species.
 Ecological variables affecting fish body size do not differ between native
 and exotic fish unless other factors are considered, such as dispersal
 capacity (migrating vs. resident fish) or mechanisms related to their
 isolation. Although temperature is not a direct driver of body size in
 Chilean fish, heterogeneity, productivity, geography, migratory ability,
 and species origin may affect body size. A better understanding of the
 mechanisms driving body size in ectotherms will aid in determining
 management priorities in the face of global climate disruption.
description: This dataset, compiled using several
 databases of existing collections of past projects (EULA Centre at
 Universidad de Concepcion), represents the raw data. Not all body size
 measurements were available from the fish collected, therefore, some
 measurements were calculated based on other measurements. For example,
 total length was not recorded for all the fish, therefore it was
 calculated based on the values of standard length. The criteria used to
 predict body size are provided in the methods section of the paper, as
 well as the methodology used to filter the data according to the analyses
 used. This dataset includes body size (standard length and total length)
 as well as the latitude and longitude of exotic and native fishes
 collected throughout southern Chile. Each row represents a different
 individual fish.
description: # Chilean freshwater fish distribution and body size *** The dataset
 provided represents the raw data. Some body size measurements necessary
 for the analyses were not available, therefore they were calculated based
 on other data. For example, the total length (*tl*) was not recorded for
 all the fish, therefore it was calculated based on the values of standard
 length (*sl*). The criteria used to predict body size are provided in the
 methods section of the [corresponding
 article](https://doi.org/10.1111/ecog.06865), as well as the methodology
 used to filter the data according to the analyses used. ## Description of
 the data and file structure The data provided includes body size (standard
 length and total length) as well as the latitude and longitude of exotic
 and native fish collected throughout southern Chile. Each row represents a
 different individual fish. The description of each column goes as follows:
 *lat*: latitude *lon*: longitude *sciname*: scientific name of the species
 collected *sl*: standard length in cm *tl*: total length in cm Missing
 values for variables *sl* and *tl* are indicated with "NA" ##
 Data was derived from the following sources: This data was compiled from
 mining databases of existing collections of past projects (EULA Centre at
 Universidad de Concepción).