Phosphorus is an essential nutrient for aquatic plants and animals. The acceptable range phosphorus in water from 0.01 to 0.03 mg/L. However, excessive use can result biodiversity loss pollution endanger creatures human health because the pollutants are non-biodegradable thus accumulate over time. This work investigated removal of synthetic wastewater containing KH2PO4 via adsorption using calc...

In the Bay of Saint-Brieuc, a 3110 ha tidal bay in NW France, English channel, the cockle (Cerastoderma edule) has been collected by traditional fishing methods for many decades without any evaluation or management of this resource taking place. Since 2001, the national Natural Reserve of the bay of Saint-Brieuc has carried out an evaluation of the stock and a mapping of the cockle fishing grou...

Ecosystem engineering research has recently demonstrated the fundamental importance of non-trophic interactions for food-web structure. Particularly, by creating benign conditions in stressful environments, ecosystem engineers create hot beds of elevated levels of recruitment, growth, and survival of associated organisms; this should fuel food webs and promote production on the ecosystem scale....

The present study aims to describe the population dynamics and state of the fishery of the mud cockle Anadara tuberculosa (locally know as piangua) in three harvesting areas along the Pacific coast of Costa Rica (Chomes, Purruja and Rincón) and to put the results in context with this species in other Costa Rican areas as well as with other Anadara spp. around the globe. The study is based on a ...

We experimentally investigated the interactions between two parasites known to manipulate their host's phenotype, the trematodes Acanthoparyphium sp. and Curtuteria australis, which infect the cockle Austrovenus stutchburyi. The larval stages of both species encyst within the tissue of the bivalve's muscular foot, with a preference for the tip of the foot. As more individuals accumulate at that...

The patterns of association between parasites within a particular host are determined by a number of factors. One of these factors is whether or not infection by one parasite influences the probability of acquiring other parasite species. This study investigates the pattern of association between various parasites of the New Zealand cockle Austrovenus stutchburyi. Hundreds of cockles were colle...

We will determine the number of powers of α that appear with nonzero coefficient in an α-power linear differential resolvent of smallest possible order of a univariate polynomial P(t) whose coefficients lie in an ordinary differential field and whose distinct roots are differentially independent over constants. We will then give an upper bound on the weight of an α-resolvent of smallest possibl...