Quantifying the behaviour of animals in the wild can provide important information on their ecology and welfare. External biologgers that ‘pop‐off’ to enable tag retrieval have been widely used in marine systems; however, they have only recently been applied to freshwater fishes. As a result, questions remain about the impact that external biologgers have on the behaviour of freshwater fishes. Here, two species of freshwater f...

Food web theory has illustrated that mobile top predators, such as lake trout ( Salvelinus namaycush ), can be potent stabilizers of food webs due to their ability to shift foraging behaviors in response to changing conditions. Consistent with this, research has demonstrated that mean lake trout food web attributes (i.e., trophic position and nearshore coupling) structurally change across environmental gradients; however, intr...

Forest productivity on glacially derived soils with weatherable phosphorus (P) is expected to be limited by nitrogen (N), according to theories of long‐term ecosystem development. However, recent studies and model simulations based on resource optimization theory indicate that productivity can be co‐limited by N and P. We conducted a full factorial N × P fertilization experiment in 13 northern hardwood forest stands of three a...

In the present study, pop‐off data storage tags (pDST) without any transmitting capabilities were attached to 118 adult salmonids in a 19 000 km 2 freshwater system (Lake Ontario). The 9·3 cm long cylindrical tags were externally attached to fishes using a backpack‐style harness, set to record pressure (dBar ≈ depth in m) and temperature every 70 s (and at some key times, every 5 s) and programmed to release from the harness a...

The Laurentian Great Lakes (LGL) constitute one of the largest freshwater systems in the world while providing social and economic value to two powerful nations. The spatial scale of these inland seas falls between two endpoints: small lakes and oceans. Lacustrine in many characteristics, the LGL often require a scientific approach with attributes similar to those of oceanography. There is a strong sense that within the LGL su...

Since 2007, 96 wild Queensland groupers, Epinephelus lanceolatus , (Bloch), have been found dead in NE Australia. In some cases, Streptococcus agalactiae (Group B Streptococcus , GBS ) was isolated. At present, a GBS isolate from a wild grouper case was employed in experimental challenge trials in hatchery‐reared Queensland grouper by different routes of exposure. Injection resulted in rapid development of clinical signs inclu...

Previous studies have attempted to link foliar resorption of nitrogen and phosphorus to their respective availabilities in soil, with mixed results. Based on resource optimization theory, we hypothesized that the foliar resorption of one element could be driven by the availability of another element. We tested various measures of soil N and P as predictors of N and P resorption in six tree species in 18 plots across six stands...

This study used stable‐isotope analysis to define the nearshore regional residency and movements of the small‐bodied Australian sharpnose shark Rhizoprionodon taylori . Plasma and muscle δ 13 C and δ 15 N of R. taylori were collected from across five embayments and compared with values of seagrass and plankton from each bay. Linear distances between adjacent bays ranged from 30 to 150 km. There was a positive geographic correl...