Impact of the historical introduction of exotic fishes on the chironomid community of Lake Azul (Azores Islands)

Pedro Miguel Raposeiro*, Maria Jesus Rubio, Alba González, Armand Hernández, Guiomar Sánchez-López, David Vázquez-Loureiro, Valentí Rull, Roberto Bao, Ana Cristina Costa, Vítor Gonçalves, Alberto Sáez, Santiago Giralt

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

22 Citations (Scopus)

Abstract

Little is known about the effect of top predator introduction in historically fishless communities, especially on remote islands. This issue is important because it might strongly affect climate reconstructions derived from biota assemblages such as chironomids. Head capsule larval remains of chironomids have been studied in a 660 years lacustrine sedimentary sequence from Lake Azul (Sao Miguel Island, Azores archipelago) to assess the extent and timescale of the effect of the predator introduction occurring in this historically fishless lake. Analysis of similarity showed that the chironomid assemblage was statistically different before and after predator introduction (R = 0.78; p < 0.001). Abundance of chironomids was about 40% greater in the fishless lake period compared to the period in the presence of predator. Results show major change in chironomid assemblage coinciding with the first time of goldfish introduction (around 1790 CE), followed by carp (1890 CE) and pike (1979 CE) introductions. The composition of feeding group guilds changed following a pattern characterized by a decrease in abundance of detritivorous and predaceous taxa and an increase in abundance of grazing chironomid taxa. This study suggests that predator introduction was the most important factor affecting the chironomid assemblages in this natural, Azorean fishless lake, but predators did not affect all chironomid species. Other external forcings like major climate oscillations, anthropogenic activities in the catchment basin, and volcanic eruptions seem to play an additional role. The latest stage of the warm and arid Medieval Climate Anomaly (1000–1300 CE) favoured the occurrence of some warm-adapted chironomid taxa, which were absent through the Little Ice Age (ca. 1450–1850 CE) cool period.

Original languageEnglish
Pages (from-to)77-88
Number of pages12
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume466
DOIs
Publication statusPublished - 15 Jan 2017
Externally publishedYes

Keywords

  • Chironomids
  • Climate change
  • Fishless lakes
  • Oceanic islands
  • Predator introductions

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