Phylloicus hansoni larval population size structures in both predator-only and predator-third party stream settings

This data was collected in 2013 and 2011 in the southern slope of Trinidad’s Northern Range Mountains, within the Caroni River drainage. The dataset consists of larval caddisfly size distribution data across streams with different fish assemblages, with data on size, frequency and gut content data of predatory fish species.<div><br></div><div>The related study investigates the relationship between the size structures of the larval caddisfly (<i>Phylloicus hansoni</i> Denning) and different fish assemblages in Trinidadian streams in two settings:</div><div><div><b>KO:</b> Killifish-Only: upstream reaches where the predatory killifish, <i>Anablepsoides hartii</i>, is the only fish species</div><div><b>KG:</b> Killifish-Guppy: downstream reaches where killifish and the omnivorous guppy <i>Poecilia reticulata</i> coexist</div></div><div><br><div>The data files are four <b>.csv</b> text files, accessible via MS Excel, open office and openly accessible text edit applications.</div><div><br></div><div>___</div><div><br></div><div>The following data files are from 5 streams, each with reaches with differing fish assemblages in 2013.<br><div><br></div><div><b>PHYL-size_frequency_data.csv</b> - size frequency data consisting of body lengths and head capsule widths of caddisfly larvae:</div><div><b>- stream: </b>El Cedro = CED, Endler = END, Guard Dog Creek = GDC, Ramdeen = RDN, Trip Trace = TRT.</div><div><b>- reach:</b> stream setting - KG or KO</div><div><b>- instar.group: </b>HCW classification as Small = S (0.2 - 0.4 mm), Medium = M (0.5 - 0.8 mm), Large = L (0.9 - 1.1 mm)</div><div><b>- HCW:</b> head capsule width in mm</div><div><b>- count: </b>frequency</div><div><br></div><div><b>PHYL-site_survey_data.csv - </b>site survey data</div><div><b>(stream & reach </b>see above)<br></div><div><b>- transect</b> - transect id in the format <b>TTTRRX</b> (TTT = transect, RR = reach, X= sequential numerical id)</div><div><b>- wetted.width </b>in cm<br></div><div><b>- depth </b>in cm<br></div><div><b>- canopy.cover</b> in %<br></div><div><b>- CBOM:</b> coarse benthic organic matter gm^-2</div><div><b>- CPUE: </b>catch per unit effort<br></div><div><br></div><div><b>PHYL-fish_size_class_data.csv </b>- killifish size class data, with mean CPUE for each size class at each stream/reach:</div><div><b>(stream & reach </b>see above)<b><br></b></div><div><b>- fish.SC - </b>fish size classification: Juvenile = J (< 15 mm), Small = S (15-30 mm), Medium = M (30-45 mm), Large = L (45-60 mm), and Extra-Large = XL (> 60 mm)</div><div><b>- mean.CPUE</b>: mean CPUE (see above for definition) for specific stream and reach</div><div>___</div><div><br></div><div>The following data was collected from killifish in 2011. Appropriate institutional permits were obtained.</div><div><br></div><div><b>PHYL-GCA_data.csv</b> - Gut content data (GCA) detailing <i>P. hansoni</i> in individual killifsh catches:</div></div></div><div><b>(stream, reach, fish.SC, HCW </b>see above)<br></div><div><b>- fish.size: </b>fish size in mm</div><div><b>- success: </b>1 = <i>P. hansoni</i> present, 0 = <i>P. hansoni</i> not present</div><div><b>- failure: </b>1 = <i>P. hansoni</i> not present, 0 = <i>P. hansoni</i> present</div><div><b>- instar: </b>instar size class - Juvenile = J, Small = S, Medium = M, Large = L, and Extra-Large = XL</div><div><br></div><div><div>___</div><div><br></div><div><b>Stoker-PHYL.R - </b>R code for analysis of data files listed above</div></div

Analysis of elemental composition and stoichiometry of adult <i>Rivulus hartii</i> using a general linear model (GLM) and variance decomposition (η²).

<p>All values are F ratios, and symbols indicate degree of significance. DF is degrees of freedom used for each variable. C∶P, N∶P and C∶N were log transformed before analysis.</p>**<p>indicates P<0.01.</p>*<p>indicates P<0.05.</p>#<p>P∼0.043.</p

Map displaying locations sampled in this study.

<p>(1) Marianne, (2) Arima, (3) Guanapo, (4) Aripo, (5) Quare, and (6) Turure. All streams were located in the Northern Range Mountains of Trinidad and Tobago (location shown in inset).</p

Correlations between resources and organismal stoichiometry of adult <i>Rivulus hartii</i>.

<p>Different aspects of the organismal stoichiometry of adult <i>R. hartii</i> are significantly correlated with the invertebrate standing stocks (a), with the stoichiometry of epilithon (b), and with the stoichiometry of benthic organic matter (c).</p

Correlations between body size, elemental composition or organismal stoichiometry of adult <i>Rivulus hartii</i>.

<p>Correlations between body size, elemental composition or organismal stoichiometry of adult <i>Rivulus hartii</i>.</p

The distribution of elemental composition in all <i>Rivulus hartii</i> individuals collected in this study compared to the distribution of elements and elemental ratios of 31 fish species compiled in a recent review [14].

<p>N/R indicates that values were not reported in the original study.</p

A statistical assessment of how much of the stream effect in organismal stoichiometry is described by the quality of benthic resources or by the overall availability of resources.

*<p>values were log transformed prior to analysis.</p

Spatial variability in the organismal stoichiometry of adult <i>Rivulus hartii</i>.

<p>Stream and the interaction of stream×community are the strongest predictors of elemental composition and organismal stoichiometry of <i>R. hartii</i>. Values are least squares means generated from a general linear model (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0032713#pone-0032713-t003" target="_blank">Table 3</a>). They are standardized to body size = 35 mm. Community designations are RO = <i>Rivulus</i> Only, RG = <i>R. hartii</i> and Guppies, HP = High Predation sites. ARM is the Arima, ARP is Aripo, GUA is Guanapo, MAR is Marianne, QUA is Quare and TUR is the Turure.</p

Environmental characteristics among <i>Rivulus hartii</i> sites.

<p>HP indicates high predation sites, RG indicates <i>R. hartii</i>/guppy sites, while RO indicates <i>R. hartii</i> only sites. Values are means and brackets represent standard deviations of three replicates when available (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0032713#s2" target="_blank">methods</a>). N/A indicates sites where logistical difficulties hindered collection of environmental variables. Sampling of environmental variables is described in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0032713#pone.0032713.s001" target="_blank">Appendix S1</a>.</p