GPS data for collection locations and 2020 collection dates for each egg population (coded as Gnnn) with numbers of eggs collected (PCR-analyzed) and species/subspecies composition

<p>Supplementary dataset (<strong>ESM 1</strong>) for "Distribution of the attached eggs of <em>Gnathopogon caerulescens</em> along the coast of Lake Biwa, Japan: fluctuation over the last 80 years based on field and literature surveys" </p>