Realm: Freshwater
Climate: Temperate
Biome: Small Lake Ecosystems
Central latitude: 35.761909
Central longitude: 140.196470
Duration: 31 years, from 1986 to 2016

88334 records

311 distinct species

Across the time series Cryptomonas is the most frequently occurring species

Methods

Lake Inba is one of the most eutrophic lakes in Japan. This data paper reports the abundance of phytoplankton species sampled biweekly from April 1986 to March 2016 at four stations in Lake Inba. Monitoring has been carried out by Chiba Prefectural Government, and phytoplankton count data have been collected since 1986. Lake Inba (Figure 1) is one of the most eutrophic lakes in Japan, and the largest lake in Chiba Prefecture (surface area, 11.55 km2; total volume, 19.7 million m3). Lake Inba is shallow (mean depth, 1.7 m, maximum depth, 2.5 m), with a catchment area of 541.1 km2. The lake is composed of a western basin and a northern basin. Monitoring has been conducted at two sites (Station 2 and 3) in the western basin, one site (Station 4) in the northern basin, and one site (Station 1) at the major inflow (Figure 1). The water quality monitoring program has been conducted by Chiba Prefectural Government (http://www.pref.chiba.lg.jp/suiho/kasentou/koukyouyousui/index.html : Note that the webpage is in Japanese). The annual means of transparency and concentrations of TP, TN, chlorophyll a (Chl.a), suspended solids (SS), and dissolved oxygen (DO) at the four sites from 1986 and 2016 are shown in Figure 2. Water samples were taken twice monthly with a bucket at a depth of 0.5 m. The sample was immediately fixed with 1% glutaraldehyde. The number of cells or units (colonies) of each phytoplankton taxon was counted under an inverted microscope with a plankton counting chamber (0.1, 0.5, or 1 ml).

Citation(s)

@Article{BioTIME_cit342, Study_id = {577}, Citation_id = {342}, Author = {Iwayama, Akemi and Ogura, Hisako and Hirama, Yukio and Chang, Chun-Wei and Hsieh, Chih-hao and Kagami, Maiko}, Journal = {Ecological Research}, Pages = {783}, Title = {Phytoplankton species abundance in Lake Inba (Japan) from 1986 to 2016}, Volume = {32}, Year = {2023}, Doi = {10.1007/s11284-017-1482-z}, Language = {English} }