For species listed under the US Endangered Species Act, federal agencies must designate ‘critical habitat’, areas containing features essential to conservation and/or that may require special management considerations. In November 2010, the National Marine Fisheries Service proposed listing a small demographically isolated population of false killer whales Pseudorca crassidens in Hawai‘i as end...

—We evaluated annual movement and mortality patterns of native Bonneville cutthroat trout Oncorhynchus clarkii utah in the Smiths Fork–Bear River watershed, which is part of the Great Basin in the western USA. Our objectives were to identify complementary habitats within the watershed, identify sources of mortality for Bonneville cutthroat trout during seasonal movements, and determine whether ...

Spatial and temporal abundance patterns of anopheline larvae and their relationships with wetland conditions were studied in an endemic malaria area in northeastern Venezuela, where Anopheles aquasalis Curry is the main vector. Larvae were sampled over a 2-yr period in 7 wetland types (brackish and freshwater herbaceous swamps, mangrove swamps, freshwater ponds, clear-cut marsh forests, small i...

Although codistributed species are affected by the same abiotic factors, such as rivers and seasonal flooding regimes, ecological traits, such as locomotion habits and habitat preferences, may also influence differences in levels of genetic diversity and differentiation. We examined population genetic structure and diversity of Hylaeamys megacephalus and Oecomys aff. roberti, two cricetid roden...

The effectiveness of fisheries management is limited by the paucity of information on how management tools, such as marine protected areas, impact key fisheries species. In the Gulf of Maine, more information is needed to determine how marine protected areas such as the Cashes Ledge Closure Area influence fish population dynamics and subsequently the status of fishery stocks. We utilized video ...

occurring species of copepods was supplemented by comparative physiological experiments at different temperatures and food concentrations within the range of their habitat to ascertain the differential effect of seasonal changes on their ability to compete for available resources. [The Sd® indicates that this paper has been cited in over 140 publications since 1961, making it the most-cited pap...

In lizards, one of the most important behavioral mechanisms to cope with spatial and temporal variations in thermal resources observed is activity time. The longer a lizard can maintain activity, the more time it has to forage and reach larger adult body size. We studied the behavioral adjustments to different climatic regimens on daily and seasonal scales in three natural populations of the li...

In tropical moist forests, seasonal drought limits plant survival, productivity and diversity. Drought-tolerance mechanisms of tropical species should reflect the maximum seasonal water deficits experienced in a particular habitat. We investigated stem xylem vulnerability to cavitation in nine tropical species with different life histories and habitat associations. Stem xylem vulnerability was ...

Non-diapausing spider mites (Tetranychus urticae) live on the undersurface of host leaves during summer, but diapausing mites overwinter in dark hibernacula. The light environments of these habitats differ: visible radiation (VIS) but not ultraviolet radiation (UV) reaches the undersurface of leaves, but neither enters dark hibernacula. Thus, mites of either seasonal form could locate their pre...