Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/49898
Title: Do temperature and water depth influence microcrustacean hatching responses from floodplain wetland sediments?
Contributor(s): Chaki, Nipa  (author); Reid, Michael  (author)orcid ; Nielsen, Daryl L (author)
Publication Date: 2021
Early Online Version: 2021-07-09
DOI: 10.1071/MF21022
Handle Link: https://hdl.handle.net/1959.11/49898
Abstract: 

Microcrustacea in ephemeral wetlands produce dormant eggs to escape prolonged dry conditions. These eggs can hatch on inundation, although in most cases not all eggs hatch during a single wetting event. Incomplete hatching can reflect bet-hedging strategies, but also the presence or absence of environmental cues that stimulate hatching. This study examines the effects of environmental cues likely to change for wetlands in the future, namely, temperature and water depth. Surface sediments collected from dry anabranches of the Macintyre River floodplain (eastern Australia) were inundated under two temperature regimes (warm and cool) in microcosms of two depths (shallow and deep). Hatched microcrustacea were sampled for 6 weeks. The abundance and assemblage composition of microcrustacea varied by temperature but not by depth. Although the total abundance was greater under warm conditions, the effect of temperature diminished over time. Temperature also had a greater effect on non-ostracods, with 144% more non-ostracods being hatched under warm than under cool conditions. Thus, changes to temperature during inundation periods arising from global climate change or river regulation are likely to influence the abundance and composition of microcrustacean assemblages, especially among non-ostracods, which will influence food availability for larval and juvenile native fish and, hence, recruitment.

Publication Type: Journal Article
Source of Publication: Marine and Freshwater Research, 72(11), p. 1613-1621
Publisher: CSIRO Publishing
Place of Publication: Australia
ISSN: 1448-6059
1323-1650
Fields of Research (FoR) 2020: 310304 Freshwater ecology
310302 Community ecology (excl. invasive species ecology)
410206 Landscape ecology
Socio-Economic Objective (SEO) 2020: 180301 Assessment and management of freshwater ecosystems
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Humanities, Arts and Social Sciences
School of Science and Technology

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