Interdisciplinary research is capable of investigating questions that no single or independent collection of disciplines can address. This interdisciplinary approach was used to investigate why nonpoint source pollution to a lake had not changed even though the often cited social drivers of this situation had changed significantly. The concept of disproportionality was adapted to examine social and biophysical interactions at different spatial and temporal scales to address this situation. Rather than using social and biophysical variable as contextual or additive relative to each other, we examined their interactive or multiplicative effects at coarse and fine spatial and temporal scales. Limited occurrence of inappropriate behaviors in vulnerable biophysical settings resulted in disproportionate environmental impacts. The concept of disproportionality implies that the environmental meaning placed on any social behavior requires accounting for where and when it occurs in a biophysical setting, and that a few outliers can determine system performance and outcomes.

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IntroductionCoastal sand dunes of Mediterranean geographical areas are exposed to degradation by natural causes and particularly to the human pressure which has a negative impact on the structure and the stability of plant communities. The environmental preservation of coastal dunes depends on the establishment and survival of AbstractThis study was conducted in order to characterize the natural arbuscular mycorrhizal (AM) biodiversity from Mediterranean sand dune ecosystems and to protect in a collection this biodiversity. The occurrence of AM fungi associated with sand dune plant species in three Mediterranean locations on the north-eastern coast of Spain was examined in one well preserved coastal sand dune and in two embrionary dunes recently protected from public access. Traditional taxonomy and molecular techniques were used to identify the AM fungal species present in these ecosystems.

The paper explores how decisions made on animal feeding operations (AFOs) influence the management of manure and phosphorus. Variability among these decisions from operation to operation and from field to field can influence the validity of nutrient loss risk assessments. These assessments are based on assumptions that the decision outcomes regarding manure distribution will occur as they are planned. The discrepancy between planned versus actual outcomes in phosphorus management was explored on nine AFOs managing a contiguous set of 210 fields in south-central Wisconsin. A total of 2611 soil samples were collected and multiple interviews conducted to assign phosphorus index (PI) ratings to the fields. Spearman's rank correlation coefficients (r(S)) indicated that PI ratings were less sensitive to soil test phosphorus (STP) levels (r(S) = 0.378), universal soil loss equation (USLE) (r(S) = 0.261), ratings for chemical fertilizer application (r(S) = 0.185), and runoff class (r(S) = -0.089), and more sensitive to ratings for manure application (r(S) = 0.854). One-way ANOVA indicated that mean field STP levels were more homogenous than field PI ratings between AFOs. Kolmogorov-Smirnov (K-S) tests displayed several nonsignificant comparisons for cumulative distribution functions, S(x), of mean STP levels on AFO fields. On the other hand, the K-S tests of S(x) for PI ratings indicated that the majority of these S(x) functions were significantly different between AFOs at or greater than the 0.05 significance level. Interviews suggested multiple reasons for divergence between planned and actual outcomes in managing phosphorus, and that this divergence arises at the strategic, tactical, and operational levels of decision-making.

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