For sessile marine invertebrates, processes contributing to larval release, dispersal, and settlement in favourable habitats are central to patterns of distribution and community structure. We quantified larval release patterns, phototactic behaviour, and settlement in response to environmental cues for the coral reef sponge Luffariella variabilis. Individual sponges released up to 830 larvae d...

In developing countries, the domination of peripheral and dependent capitalism relations and the lack of appropriate structures and channels of attracting, this system have caused some kind of spatial-anatomic unbalances that has resulted in the appearance of single cities with national and regional prevalence. This situation is the main reason for small, medium and intermediate cities to lose ...

Tubes constructed of different materials were used to examine the role of hydrodynamics and surface characteristics, as measured by contact angles, on larval attachment of marine polychaetes, bryozoans and barnacles. Tubes (10 mm inner diameter) of 7 different materials, ranging in contact angle from 25° to 113°, were used. Laboratory and field experiments were conducted using a range of flow r...

Understanding how the density and spatial arrangement of invaders is critical to developing management strategies of pest species. The Pacific oyster, Crassostrea gigas, has been translocated around the world for aquaculture and in many instances has established wild populations. Relative to other species of bivalve, it displays rapid suspension feeding, which may cause mortality of pelagic inv...

Structured settlement underwriting is the underwriting of medically impaired lives for the purchase of an annuity to fund the settlement. Other than risk assessment, structured settlement (SS) underwriting has little in common with traditional life insurance underwriting. Most noteworthy of these differences is the relative lack of actuarial data on which to base decisions about mortality and t...

Previous comparative analyses of gross and net settlement have focused on the credit risk of the central counterparty in net settlement arrangements, and on the incentives for participants to alter the risk of the portfolio under net settlement. By modeling the trading economy that generates the demand for payment services, we are able to show some largely unexplored advantages of net settlemen...

Some sea urchins, including the purple sea urchin Strongylocentrotus purpuratus, have been successfully used in aquaculture, but their slow growth and late reproduction are challenging to overcome when developing efficient aquaculture production techniques. S. purpuratus develops via an indirect life history that is characterized by a drastic settlement process at the end of a larval period tha...

Manipulative field experiments carried out on sheltered rocky shores investigated settlement and post-settlement interactions between Semibalanus balanoides and three species of fucoid canopy algae, Fucus spiralis L., Ascophyllum nodosum (L.) Le Jolis and Fucus serratus L. All three species had a negative effect on settlement and early recruitment of S. balanoides, densities being significantly...

As nuclear families have become increasingly less stable over the past quarter century, married couples have been faced with the difficult task of negotiating the terms by which marriage is ended. For parents, divorce involves questions revolving around the care and sustenance of children. In this paper we investigate whether observed divorce settlements indicate that parents make trade-offs in...

Settlement inhibition of barnacle (Amphibalanus amphitrite) cypris larvae resulting from exposure to ultrasound was measured at three frequencies (23, 63, and 102 kHz), applied at three acoustic pressure levels (9, 15, and 22 kPa) for exposure times of 30, 150, and 300 s. The lowest settlement was observed for 23 kHz, which also induced the highest cyprid mortality. Cyprid settlement following ...