Effects of co-occurrence of invading Procambarus clarkii and Pomacea canaliculata on Vallisneria denseserrulata-dominated clear-water ecosystems: a mesocosm approach

Gao J., Yang C., Zhang Z., Liu Z., Jeppesen E.

KNOWLEDGE AND MANAGEMENT OF AQUATIC ECOSYSTEMS, cilt.2021-January, sa.422, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2021-January Sayı: 422
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1051/kmae/2021029
  • Dergi Adı: KNOWLEDGE AND MANAGEMENT OF AQUATIC ECOSYSTEMS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, Environment Index, Pollution Abstracts, Veterinary Science Database, Directory of Open Access Journals
  • Anahtar Kelimeler: Biological invasions, red swamp crayfish, golden apple snail, submerged macrophytes, RED SWAMP CRAYFISH, SUBMERGED MACROPHYTES, PHYTOPLANKTON, COMMUNITY, AMPULLARIIDAE, RESUSPENSION, GASTROPODA, INVASIONS, IMPACT, SIZE
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

Single invaders often substantially alter ecosystems, but the potential impacts by multiple invaders remain understudied. The golden apple snail (Pomacea canaliculata) and the red swamp crayfish (Procambarus clarkii) are two widespread coinvaders. To test the effects of co-occurrence of the two species on a clear-water macrophyte state, we performed a 20-day experiment in 16 mesocosms (4 contained only two snails, 4 contained only two crayfishes, 4 contained two snails and two crayfishes, and 4 controls). Comparing with the control, the leaf length, number, and biomass of Vallisneria denseserrulata had decreased in the snail-only and crayfish-only treatments. In the crayfish-only treatment, total nitrogen, total phosphorus and total suspended solids had increased compared with the control, while they did not differ between the snail-only and the control treatment. Nutrients and turbidity concentrations did not differ between the snail + crayfish and the crayfish-only treatment, and plant biomass did not differ between the snail + crayfish and the snail-only treatment. These findings suggest that golden apple snails mainly affected the lake ecosystem by plant grazing, while red swamp crayfishes disturbed the sediment by increasing nutrients in the water and through resuspension. These snail and crayfish together had mainly additive effects on macrophyte and the physico-chemical variables studied.