The impact of acidification on marine ecosystems has become a topic of priority research, following realization of unabated ocean acidification (OA), derived from globally-rising atmospheric CO2. Many coastal and estuarine ecosystems have historically been acidified through various processes, and it is possible that we can learn and make predictions about OA impacts from the ways estuarine species and communities adapt and respond to acidified water. Studying estuarine acidification, nonetheless, aids understanding of the processes that affect ecological structure and functioning, important for coastal conservation and management. A broad-based research programme was implemented at UBD between 2011 and 2015, to investigate how variation in acidity and salinity affected assemblages and species in the Brunei Estuarine System (BES), an ecologically and economically important natural system in the region. This review summarizes studies that investigated for the BES, (i) the physical habitats and water physicochemistry, (ii) responses of planktonic and benthic microbial and faunal assemblages to exposure to variable and potentially highly acidic water, (iii) effects of acidification on ecological processes, such as barnacle dispersal and recruitment, (iv) behavioural and physiological mechanisms of organisms to cope with highly fluctuating and extreme pH water, with special reference to the gastropod, Indothais gradata, and (v) contaminant uptake by Indothais gradata under acidified conditions. The significance of the findings to the ecology of the BES, gaps that need addressing, and how estuarine acidification may contribute to predicting responses to OA are evaluated and discussed.

/pdf/ecological-responses-to-fluctuating-and-extreme-marine-2o6y4zblde.pdf

Ecological responses to fluctuating and extreme marine acidification: lessons from a tropical estuary (the Brunei Estuarine System)

Amongst the genus Agauopsis, the brevipalpus group is the one most rich in species. The group can roughly be subdivided on the basis of the number of spines on telofemur I. The tropical and warm-temperate Indo-West Pacific region is dominated by species with four spines. A new species from this region, Agauopsis dissimilis n. sp., is described, the characters of another seven species are outlined and a summary of the knowledge of the Agauopsis fauna of Singapore added. The brevipalpus group now includes 25 described species. A key and the geographical distribution are given. Species with three spines are spread in the temperate zones of the Pacific, in areas which formerly were part of the shoreline of Panthalassa. Species with four spines are most abundant in the tropical and warm-temperate Indo-West Pacific region and the North Atlantic; present-day records of this species group are primarily from areas once bordering the Tethys.

/pdf/the-agauopsis-brevipalpus-group-acari-halacaridae-3he6p9bf2u.pdf

The Agauopsis brevipalpus group (Acari: Halacaridae), descriptions of tropical Indo-West Pacific species, a key to all species, their geographical distribution and reflections on dispersal routes

The present study reports the halacarid mite species Agauopsis sordida Bartsch from Brunei Darussalam. This represents the first record of the genus Agauop­ sis from this country. The distribution of the brevipalpus group is also discussed.

First record of Agauopsis mites (Acari: Halacaridae) from Brunei Darussalam and notes on the distribution of the Agauopsis Brevipalpus group

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First record of Agauopsis mites (Acari: Halacaridae) from Brunei Darussalam and notes on the distribution of the Agauopsis Brevipalpus group