Nest predators can adversely affect the viability of songbird populations, and their impact is exacerbated in fragmented habitats. Despite substantial research on this predator-prey interaction, however, almost all of the focus has been on the birds rather than their nest predators, thereby limiting our understanding of the factors that bring predators and nests into contact. We used radiotelem...

1 Anthropogenic alteration of landscapes can affect avian nest success by influencing the abundance, distribution, and behavior of predators. Understanding avian nest predation risk necessitates understanding how landscapes affect predator distribution and behavior. 2 From a sample of 463 nests of 17 songbird species, we evaluated how landscape features (distance to forest edge, unpaved roads, ...

This catalogue includes all valid family-group (8 subfamilies, 52 tribes, 14 subtribes), genus-group (349 genera, 86 subgenera), and species-group names (2825 species, 215 subspecies) of darkling beetles (Coleoptera: Tenebrionidae) known to occur in North America and their available synonyms. Data on extant, subfossil and fossil taxa are given. For each name the author and year and page number ...

It is well known that biochemical reactions take place in buffered media and that minor changes in hydrogen-ion concentration can affect profoundly the course of reactions. In the blood of man a variation of more than ±0.1 pH from the normal 7.4 is considered pathological, and a change greater than ±0.4 pH is usually fatal. The pH of the blood is maintained within these narrow limits by a syste...

The Iberian Peninsula is a global hotspot for bee diversity due to its large number of different habitats, particularly Mediterranean scrubland, mountains, and hot cold steppe. In line with status as diversity, the peninsula hosts very Andrena fauna, which despite progress in recent years remains incompletely studied, reference genetic investigation. Here fauna comprehensively revised, resultin...

L HE only genetic difference between the composition of a sweet corn kernel and that of field corn is due to a single recessive gene out of the hundreds or thousands of genes in corn. This gene makes the sugary condition of the kernel persist in sweet corn; or, in other words, prevents the conversion of some of the sugar into starch. The first recorded observation of sweet corn by w^hite men ap...

Summary. This work presents a first taxonomic revision of the historical type collections West Palaearctic bees in tribe Eucerini (Apidae) that are preserved Muséum national d'Histoire naturelle, Paris. A total 72 species names revised, 147 specimens recognised, and 33 synonyms newly proposed. Unexpectedly, some oldest bee were found to be misinterpreted have been incorrectly used for period ne...

Settlement and metamorphosis of marine invertebrate larvae is an ecological process of profound importance to the structure of benthic marine communities. Yet, metamorphosis is also a developmental process and our understanding of the mechanisms that regulate it remains relatively poor. Over the last 15 years, a nitric oxide (NO) based signaling system has emerged as the most phylogenetically w...

Human activities have dramatically altered the global nitrogen cycle approximately doubling the rate of nitrogen input into the biosphere. Linda Deegan and her team are in the midst of conducting a long-term fertilization experiment at the Plum Island Sound estuary in order to understand how ecosystem function changes when excess nutrients (70-100 uM NO3 and 5-7 uM PO4 3) are added. They have f...