A Lagrangian, particle-based numerical method (tree code gravity plus smoothed particle hydrodynamics) was used to simulate clump-clump collisions occurring within GMCs. The collisions examined were between 75M clumps at a relative Mach number ofM = 3. The clumps were modelled using isothermal spheres which were individually in stable equilibrium. The collisions formed shock-compressed layers, ...

High-mass star formation theories make distinct predictions on the properties of prestellar seeds high-mass stars. Observations early stages can provide crucial constraints, but they are challenging and scarce. We investigate core population embedded in clump AGAL014.492-00.139, we study kinematics at clump-to-core scales. have analysed an extensive dataset acquired with ALMA interferometer. Ap...

The presence of stars on retrograde orbits in disc galaxies is usually attributed to accretion events, both via direct accretion, as well through the heating stars. Recent studies have shown that can also be produced scattering by dense clumps, which are often present early stages a galaxy's evolution. However, so far it has been unclear whether other internally-driven mechanisms, such bars, ca...

Twenty-first century conservation is centered on negotiating trade-offs between the diverse needs of people and the needs of the other species constituting coupled human-natural ecosystems. Marine forage fishes, such as sardines, anchovies, and herring, are a nexus for such trade-offs because they are both central nodes in marine food webs and targeted by fisheries. An important example is Paci...

Evidence suggests that the year-class strength of salmon populations is related to decadal scale climatic/ocean fluctuations. The interactions have complex latitudinal patterns and appear to involve the major food web and current structures of the North Pacific. To understand the effect of climate on Columbia River salmon the North Pacific system must be considered. A brief review of the patter...

The quantity and quality of propagules, i.e. reproductive output, play a key role in the dynamics of exploited populations, with particular implications for sex-changing fish. �ere, we studied for the first time the effects of maternal traits on the reproductive output of the Mediterranean rainbow wrasse Coris julis, a sequential hermaphroditic fish widely distributed in temperate marine coasta...

The Red Sea (Lessepsian) migrant fish, the arrow bulleye, Priacanthus sagittarius, and the spotbelly batfish, Platax teira, are recorded for the second time from the Mediterranean, suggesting the establishment of new populations. The record of another Lessepsian migrant, the spiny blaassop, Tylerius spinosissimus from Israel, constitutes a considerable extension of its distribution range in the...

The increasing demand for shark fins in Asia, and the publicity resulting from finning and discarding live sharks, has generated concern regarding the sustainability of the world’s shark populations. These concerns can be attributed to the shark’s life history, which is characterized by a pattern of slow growth, late maturity, few offspring, and long life, making populations vulnerable to overe...