![]() Community structure in social and biological networks. Structural asymmetry and the stability of diverse food webs. Food web complexity and species diversity. Arthropod regulation of micro- and mesobiota in below-ground detrital food webs. Complex trophic interactions in deserts: an empirical critique of food-web theory. Food webs: linkage, interaction strength and community infrastructure. Detritus food webs in conventional and no-tillage agroecosystems. Reciprocal subsidies: dynamic interdependence between terrestrial and aquatic food webs. Food webs: reconciling the structure and function of biodiversity. Does food web theory work for marine ecosystems? Mar. These results indicate that knowledge of dynamically shifting food webs is crucial for understanding temporally varying roles of ‘core species’ in ecosystem processes. The substantial shifts of network structure entailed alternations of spider species located at the core positions within the entangled webs of interactions. Those modules differed in detritus/grazing food chain properties, forming complex fission–fusion dynamics of belowground and aboveground energy channels across the seasons. The networks were compartmentalized into modules (groups) of closely interacting predators and prey in each month. On the basis of high-throughput detection of prey DNA from 1,556 spider individuals collected in a grassland ecosystem, we reconstructed dynamics of interaction networks involving, in total, 50 spider species and 974 prey species and strains through 8 months. Here, we show that dynamics of species-rich predator–prey interactions can be characterized by remarkable network structural changes and alternations of species with greatest impacts on community processes. However, it has remained a major challenge to reveal how species-rich networks of predator–prey interactions are continually reshaped through time in the wild. Uncovering the network architecture of such trophic interactions has been recognized as the essential step for exploring species with great impacts on ecosystem-level phenomena and functions. Netflix also served up a helping of jaguar-caiman action recently in a sequence filmed for the David Attenborough-narrated series Our Planet (it's a predation bonanza if you're a jaguar fan!).In nature, entangled webs of predator–prey interactions constitute the backbones of ecosystems. ![]() Indeed, the latest footage is not the first time we've seen the big cats take on reptilian prey. Studies in the Pantanal – a swathe of wetland covering 70,000 square miles (181,300 square kilometres) in the centre of South America – have shown that jaguars target caimans across a broad size range. ![]() In the cat family, they are stocked with some of the strongest jaws for their size and have the brawn to back it up. These burly cats are built for tackling sizeable prey. The jaguar administers an impressive chokehold, but to dispatch prey of this size, it will need to resort to its trademark killing bite delivered to the back of the head or skull. It returns with a hefty caiman clasped between its jaws. The jaguar closes in on its target and lunges below the surface disappearing momentarily in a splash of white. "With each step a trap could snap shut," he explains, reminding us that this river is filled with teeth. The clip kicks off with a jaguar lurking jaw-high in a stretch of murky water while Bear Grylls narrates.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |