Arthur R. Bos

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Secondary effects of a single dose of the insecticide Dursban 4E (active ingredient chlorpyrifos) were studied in indoor experimental freshwater ecosystems intended to mimic drainage ditches. Two experiments were performed, one in which all model ecosystems were dominated by the macrophyte Elodea muttallii, and one using systems devoid of macrophytes. In(More)
The bandwidth for the recording of the orbicularis oculi blink reflex electromyogram (EMG) response is optimal when low-frequency artifacts, such as motion artifacts and cross-talk from other muscles, are maximally suppressed, whereas true EMG signal power is maximally retained. The optimal bandwidth was investigated for acoustic, electrocutaneous, and(More)
Large-scale losses of seagrass beds have been reported for decades and lead to numerous restoration programs. From worldwide scientific literature and 20 years of seagrass restoration research in the Wadden Sea, we review and evaluate the traditional guidelines and propose new guidelines for seagrass restoration. Habitat and donor selection are crucial:(More)
The free-living solitary mushroom coral Heliofungia actiniformis resembles sea anemones by having large, fleshy polyps with long tentacles, which provide shelter to symbiotic organisms. Commensal shrimps are well studied, but little is known about associated fish fauna. Therefore, the associated fauna of 118 coral polyps of H. actiniformis was examined at a(More)
Recently, we observed a solitary polyp attacking and completely ingesting a crown-of-thorns starfish (Fig. 1). This large (21-cm diameter) ‘coral-like’ animal, Pseudocorynactis sp., belongs to the order of Corallimorpharia (Anthozoa; Hexacorallia (Daly et al. 2003)). Although Pseudocorynactis sp. is frequently encountered in reefs of both Indonesia (den(More)
Although the presence of fish on coral colonies and individual polyps of the Anthozoa is relatively common (e.g., Munday et al. 1997), the only fish known to be associated with Heliofungia actiniformis is the white pipefish Siokunichthys nigrolineatus (see Hoeksema et al. 2011). Other fishes may hover over individuals of this large solitary coral polyp, but(More)
Clownfishes (Pomacentridae) are obligate symbionts of sea anemones and usually do not share hosts due to their highly territorial behaviour. Therefore, coexistence of two clownfish species within one host anemone has been considered a rare exception (Fautin 1991) and possible only if fish species divide the host in exclusive territories without sharing(More)
Archaster typicus, a common sea star in IndoPacific regions, has been a target for the ornamental trade, even though little is known about its population biology. Spatial and temporal patterns of abundance and size structure of A. typicus were studied in the Davao Gulf, the Philippines (125 42.70E, 7 0.60N), from February 2008 to December 2009. Specimens of(More)
Transplantation of eelgrass Zostera marina has become a promising restoration tool since natural recolonisation during the last century failed after massive mortality, due to a combination of a wasting disease outbreak and a sequence of human impacts. We studied the interactive effects of planting density and hydrodynamic exposure on the survival of(More)
The kinetics of the hydrogenation of gas mixtures of ethyne and ethene on a commercial Pd catalyst was studied experimentally using a Berty reactor. The experimental conditions corresponded with typical industrial tail-end conditions, 0.3-1.3% C2H2, 0.4&4% HZ, the balance being ethene. The influence of small amounts of carbon monoxide added to the feed gas(More)