ABSTRACT Migrant juvenile Atlantic herring ( Clupea harengus ) from across the greater Gulf of Maine (GoM) provide pelagic forage in the Grand Manan Island region, a major trophic hub. A centuries‐old weir fishery for herring juveniles, never monitored, has collapsed from chronic GoM overfishing. Razorbills ( Alca torda ) and Atlantic puffins ( Fratercula arctica ) nest on nearby Machias Seal Island, feeding their chicks with these herring. Using published data, this study demonstrates probabilistic relationships between weir‐fishery landings of juvenile herring (~availability) and relative portions of young herring fed to both razorbill and puffin chicks. Herring‐diet differences for razorbills suggest nuanced forecasting of prospective imminent fishery collapses. Facing collapse, razorbills are more likely to capture herring in addition to less‐pelagic alternate species (hake, sand lance), while puffins make more use of the alternates. Previous research, based on exploratory correlation and regression, did not demonstrate these connections for the Grand Manan region. As indicator “units,” the probabilistic herring‐seabird relationships raise the potential of interspecific corroboration in herring recruitment forecasts. For example, when landings are low, razorbill use is greater than puffin use, and razorbill herring biomass use remains moderate‐to‐high, fisheries for juveniles could place increased multiyear limits on prospective catches system‐wide. Such relationships could be of considerable precautionary use, since systemic fishing‐induced forage deficiencies have become the norm. With the erosion of resilience, ecosystem components are now at high risk of extirpation in the northeastern GoM. The concepts should increase understanding of Anthropocene challenges and the actions required of humans to prevent depletion of natural resilience in ecosystems.
Henderson mine has engaged in concerted efforts to better understand the impacts of drilling quality on cave development and other excavation blasting. Building upon earlier successes, Henderson has implemented a multi systems approach to remotely map and monitor cave development. Utilizing a UAS with high-definition video and a LIDAR payload, coupled with production drill data, Henderson Mine has enacted a step-change improvement in remote excavation mapping, leading to improved accuracy of planned versus actual cave geometry and refinements to blast design. This data aids in optimizing the drilling/blasting cycle and cave management during initiation through production. These efforts, coupled with existing geomechanical monitoring technologies (micro-seismic, TDR, smart markers) also provide improved insight into cave morphology, behavior, and rock mass modelling.
This study aimed to quantify the aboveground biomass and carbon stock of Buho (Schizostachyum lumampao) in Cuyambay, Tanay, Rizal, Philippines, and develop allometric equations for predicting aboveground biomass. Ten plots (5 m x 5 m) in an elevation ranging from 419-460 meters above sea level (masl) that contained one group of clumping bamboos were randomly established. Three culms were harvested from each clump for a total of thirty culms. The Buho in Sitio Tablon had a mean height (H) of 8.37 m, diameter at breast height (DBH) of 6.46 cm and thickness at breast height (TBH) of 6.05 mm. The mean aboveground biomass and carbon stock densities were 74.19 ton∙ha–1 and 31.35 ton∙ha–1, respectively. The culm had the highest contribution to aboveground biomass and carbon stock density, followed by the branches, then the leaves. These results demonstrate the potential of Buho to store atmospheric carbon at a level comparable to that of other tree plantation species. Allometric regression revealed that 70.0% of the variance in culm biomass can be explained by DBH2H.
