Волонтерство как социальный институт

Работа выполнена при поддержке РГНФ в рамках проекта №14-03-00072

Dataset-Katano_et_al_RSOS

The all data used in the paper, grazer (M. quadriloba larvae) density and chlorophyll (chl) a of periphyton in the stream

The results of hand-capture surveys and eDNA detection (September and October) for <i>O</i>. <i>japonicus</i>.

<p>The results of hand-capture surveys and eDNA detection (September and October) for <i>O</i>. <i>japonicus</i>.</p

Map of survey sites and eDNA concentration of water on the surface of headwater streams.

<p>At the sites on the expanded map (A1-A7, O1-O3), we directly captured the species using the hand-capture method (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0176541#pone.0176541.t001" target="_blank">Table 1</a>). N. D. means eDNA was not-detected.</p

The eDNA concentrations (in PCR reactions) from water samples collected from the surface and under stones at sites in the Akazai River.

<p>The bold line in the box indicates the median value. The upper and lower limits of the box and the whisker plots indicate the first and third quartiles and ± 1.5 × interquartile ranges, respectively. The red dots represent each data point.</p

Comparison of mean eDNA concentration of the water samples collected from the surface and under stones at sites in the Akazai River.

<p>The line shows 1:1 correlation for the log₁₀ concentrations.</p

The mean ΔCt value from internal positive controls by the PCR inhibition test for the samples collected from the surface and under stones at sites in the Akazai River.

<p>The bold line in the box indicates the median value. The upper and lower limits of the box and the whisker plots indicate the first and third quartiles and ± 1.5 × interquartile ranges, respectively. The red dots represent each data point.</p

Fig. S1 Abiotic factors (water temperature, electric conductivity (EC), and precipitation) at each survey station in the Shigo-gawa stream during downstream surveys. Precipitation was observed at Nara Meteorological Observatory. Table S1. Environmental variables (mean ± 1 SD) of each sampling site. The values in parentheses are sample sizes. from Distribution and drift dispersal dynamics of a caddisfly grazer in response to resource abundance and its ontogeny

Stream grazers have a major impact on food web structure and the productivity of stream ecosystems; however, studies on the longitudinal (upstream versus downstream) and temporal changes in their drift dynamics and resulting distributions remain limited. Here, we investigated the longitudinal and temporal distributions and drift propensity of a trichopteran grazer, the caddisfly, <i>Micrasema quadriloba</i>, during its life cycle in a Japanese stream. The distribution of larvae significantly shifted downstream during the fifth instar larval stage during late winter; with periphyton abundance (i.e. their food source) showing similar shifts downstream. Therefore, our results show that the drift dispersal the caddisfly occurs in response to decline in available food resources (i.e. food-resource scarcity) and an increase in food requirements by growing individuals. Furthermore, our results show that this observed longitudinal shift in larval distribution varies through their life cycle, because the drift dispersal of fifth instar larvae was greater than that of immature larvae. The correlation between periphyton abundance and drift propensity of fourth instar larvae was not statistically significant, whereas that of fifth instar larvae was significantly negative. In conclusion, we detected an ontogenetic shift in drift propensity, which might explain the longitudinal and temporal distributions of this species

Illustration water sampling under stones.

<p>Illustration water sampling under stones.</p

Data and R codes

Data and R codes for "A shady phytoplankton paradox: When phytoplankton increases under low light" by Yamamichi et al