ORCID Profile
0000-0002-3305-5644
Current Organisations
Centre for Biological Control
,
Kochi University
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Publisher: Springer Science and Business Media LLC
Date: 04-09-2019
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/MF18302
Abstract: Stable isotope analyses of muscle tissue (δ13Cmuscle and δ15Nmuscle) and otoliths (δ13Cotolith and δ18Ootolith) were used to retrospectively track habitat uses of Lethrinus lentjan, and to determine any association between Setiu Lagoon (nursery habitat) and coastal artificial reefs (CARs adult habitats) on the Terengganu coast, Malaysia. Muscle stable isotopes exhibited a spatial change from inshore to offshore habitats associated with growth, possibly related to the reef-ward movement of the fish. Otolith stable isotopes of adult fish from CARs were measured in juvenile (from outside the core to the first opaque zone of otolith) and adult (the edge of otolith) portions and were compared with those of juveniles from Setiu Lagoon, suggesting that the adult fish may not primarily use the lagoon as a nursery before ontogenetically migrating to CARs. The effects of coastal currents between monsoonal seasons could reorientate offshore juvenile migration hence, adult cohorts in CARs may be replenished from various nursery habitats along the coast. Additionally, similarities in the δ18Ootolith values of juvenile and adult sections suggested that some in iduals may not spend their juvenile phases in shallow estuarine habitats. Based on the findings of this study, we recommend that coastal conservation strategies take into account multiple nursery habitats rather than a single one.
Publisher: Springer Berlin Heidelberg
Date: 2013
Publisher: Elsevier BV
Date: 10-2012
DOI: 10.1016/J.JSB.2012.05.017
Abstract: We performed high resolution marking experiments using seawater with elevated Sr concentration to investigate the timing and ultrastructure of skeletal deposition by massive Porites australiensis corals. Corals were cultured in seawater enriched with Sr during day-time only, night-time only or for one full-day. Cross sections of skeletal material were prepared and the Sr incorporated into the newly deposited skeleton analyzed by electron probe microanalysis. These regions of Sr incorporation were then correlated with skeletal ultrastructure. Massive Porites coral skeletons are composed of two types of microstructural elements - the "centers of calcification" and the surrounding fibrous structural region. Within the fibrous structural region, alternative patterns of etch-sensitive growth lines and an etch-resistant fibrous layer were observed. In the full-day s les, high-Sr bands extended across both growth lines and fibrous layers. In day-time s les, high-Sr regions corresponded to the fibrous layer, while in the night-time s les high-Sr regions were associated with an outermost growth line. These distinct growth patterns suggest a daily growth pattern associated with the fibrous region of massive P. australiensis corals, where a pair of narrow growth lines and a larger fibrous layer is seen as a daily growth region.
Publisher: Wiley
Date: 23-02-2021
Abstract: Biological control (biocontrol) of invasive alien plants is a widely utilised weed management tool. Prospective biocontrol agents are typically assessed through host specificity testing and pre‐release efficacy studies performed in quarantine. However, rearing of the potential biocontrol agents and/or test plants is often difficult or impossible under quarantine conditions. Moreover, practitioners may attain laboratory artefacts in quarantine, which may result in the potential agent being needlessly rejected. Field‐based studies in the weed's indigenous distribution could overcome these issues. Sporobolus pyramidalis and Sporobolus natalensis (giant rat's tail grass Poaceae) are indigenous in Africa but have become problematic invasive alien plants in Australia. A previous biocontrol program was terminated because the candidate agent could not be reared and tested in quarantine. We performed field‐based host specificity and efficacy studies for prospective biocontrol agents in South Africa (indigenous distribution). Forty‐seven non‐target grass species were s led during host specificity assessments. Candidate agent efficacy was estimated based on damage to the target weeds, for each host specific candidate in idually and in combination with other host‐specific candidates. Three species of endophagous wasps were deemed host specific. Efficacy assessments identified an undescribed stem‐boring wasp ( Tetramesa sp.) species as the most damaging candidate. A second Tetramesa species was much less damaging alone but had a cumulative impact on the plant in combination with the more damaging Tetramesa species. Both Tetramesa species are recommended for importation into quarantine in Australia for confirmatory host specificity testing with a significantly reduced test plant list. Synthesis and applications . Similar field‐based assessments in the indigenous distribution of weeds targeted for biocontrol could be included in the future programs. Where rearing of potential agents and/or test plants is difficult or impossible under quarantine conditions, our field‐based method provides an alternative. Where quarantine‐based testing is feasible, this method ensures that only candidates that have passed an ecologically realistic host‐specificity and potential efficacy screening are imported into quarantine. This may reduce the number of agents that are imported and the length of time each agent is kept in quarantine. This is advantageous because quarantine space is highly valuable and is usually a limiting factor in pre‐release assessments of biocontrol agents.
Publisher: Springer Science and Business Media LLC
Date: 03-06-2020
No related grants have been discovered for Yuji Sano.