nutrients directly into fish population dynamics, the problem is formulated in deterministic and stochastic terms. The … deterministic model assumes a given ecological state in which nutrients contribute positively to pelagic fish production. The … certain conditions a marginal change in nutrients generates positive aggregate benefits. …

specific contexts. Our interest is in the role of human relationships in managing natural resources (forage and livestock) in … facilitates livestock mobility as a human response to a situation where rainfall is so variable in time and space that it is … difficult to maintain an economically viable livestock herd on a single management unit. Contrary to expectations, we found that …