The Influence of Geology and Season on Macroinvertebrates in Belizean Streams: Implications for Tropical Bioassessment

Considerable attention has been paid to the potentially confounding effects of geological and seasonal variation on outputs from bioassessments in temperate streams, but our understanding about these influences is limited for many tropical systems. We explored variation in macroinvertebrate assemblage composition and the environmental characteristics of 3rd- to 5th-order streams in a geologically heterogeneous tropical landscape in the wet and dry seasons. Study streams drained catchments with land cover ranging from predominantly forested to agricultural land, but data indicated that distinct water-chemistry and substratum conditions associated with predominantly calcareous and silicate geologies were key determinants of macroinvertebrate assemblage composition. Most notably, calcareous streams were characterized by a relatively abundant noninsect fauna, particularly a pachychilid gastropod snail. The association between geological variation and assemblage composition was apparent during both seasons, but significant temporal variation in compositional characteristics was detected only in calcareous streams, possibly because of limited statistical power to detect change at silicate sites, or the limited extent of our temporal data. We discuss the implications of our findings for tropical bioassessment programs. Our key findings suggest that geology can be an important determinant of macroinvertebrate assemblages in tropical streams and that geological heterogeneity may influence the scale of temporal response in characteristic macroinvertebrate assemblages.

The Measure of All Things: Rethinking Humanism through Art (Group Show)

University of Buffalo New York Department of Art Gallery. The ancient philosopher Protagoras is most famous for his claim: “Of all things the measure is Man” and today, Western societies continue to promote anthropocentrism, an approach to the world that assumes humans are the principal species of the planet. We naturalize a scale of worth, in which beings that most resemble our own forms or benefit us are valued over those that do not. The philosophy of humanism has been trumpeted as the hallmark of a civilized society, founded on the unquestioned value of humankind defining not only our economic, political, religious, and social systems, but also our ethical code. However, artists recently have questioned whether humanism has actually lived up to its promises and made the world a better place for humankind. Are we better off privileging humans above all else or could there be other, preferable, ways to value life? With the continued prevalence of violent crimes, even genocide, in the twentieth and twenty-first centuries, we see the ways in which the discourse of humanism falters, as groups are targeted through rhetoric reducing them to the subhuman, and therefore disposable. But what if the subhuman, nonhuman, and even the non-animal and material, were reconsidered as objects of worth even if far removed from us?