what are the two main categories of human pathways to introduced species?
476911
['Intentional, which is the result of a deliberate movement of a species by humans outside of its natural range. ... ', 'Unintentional, which is the inadvertent movement of species as a byproduct of some other human activity.']
276150
Exotic and invasive species are two types of non-native species. ... When an exotic species becomes harmful to the ecosystem, it is called an invasive species. The main difference between exotic and invasive species is that exotic species is harmless to the ecosystem whereas invasive species is harmful to the ecosystem.
258313
['Location: Coordinates and Relative Distance. ••• ... ', 'Human–Environment interaction: Altering the Environment. ••• ... ', 'Place: Human and Environmental Differences. ••• ... ', 'Region: Broad Groupings. ••• ... ', 'Movement: Transmission of Goods and Services. •••']
651047
['destruction, degradation and fragmentation of habitats.', 'reduction of individual survival and reproductive rates through exploitation, pollution and introduction of alien species.']
239688
['In such cases, it is important to be clear about what is important. ... ', 'Phase 1: “Humanising” the globe (first 190,000 years)', 'Phase 2: “Localising” the world economy (12,000 BCE - 1820)', 'Phase 3: The Old Globalisation (1820 - 1990)', 'Phase 4: The New Globalisation (1990 - Now)']
170198
In biology, a non-native species did not originate in a given habitat, but may have a neutral or even positive effect on the ecosystem. An invasive species has a negative effect on the ecosystem.
142550
['Terrestrial ecosystem.', 'Forest ecosystem.', 'Grassland ecosystem.', 'Desert ecosystem.', 'Tundra ecosystem.', 'Freshwater ecosystem.', 'Marine ecosystem.']
1322784
['In-situ: Conservation of habitats, species and ecosystems where they naturally occur. ... ', 'Ex-situ: The conservation of elements of biodiversity out of the context of their natural habitats is referred to as ex-situ conservation. ... ', 'Hotspots of biodiversity.', 'Threatened Species.']
1177048
Believe it or not, after habitat loss, invasive species are the second most significant threat to biodiversity. In a new environment or ecosystem, invasive species become predators and compete with the existing species, to the extent that they are inhibiting the survival of native plants and animals!
440731
['Competition & Predation. Predation is when one organism eats another organism to obtain nutrients. ... ', 'Commensalism. ... ', 'Parasitism. ... ', 'Mutualism.']
115818
['Competition & Predation.', 'Commensalism.', 'Parasitism.', 'Mutualism.', 'Amensalism.']
942491
Ecologists have identified numerous keystone species, defined as organisms that have outsized ecological impacts relative to their biomass. Here we identify human beings as a higher-order or 'hyperkeystone' species that drives complex interaction chains by affecting other keystone actors across different habitats.
648832
Five main threats to biodiversity are commonly recognized in the programmes of work of the Convention: invasive alien species, climate change, nutrient loading and pollution, habitat change, and overexploitation.
327705
Trees which colonised the land after the last ice age and before the UK was disconnected from mainland Europe are classed as native. Trees that have been brought to the UK by humans are known as non-native.
126818
The evolution of modern humans from our hominid ancestor is commonly considered as having involved four major steps: evolving terrestriality, bipedalism, a large brain (encephalization) and civilization.
1470075
There are five types of ecological relationships: competition, predation, commensalism, mutualism and parasitism.
483872
Honey bees, and all livestock except the American bison and turkey are non-native species to North America. Eurasia carp, Apple Snails and Dung Beetles, earthworms, cats, parrots, common Starlings, Wall lizards. In Alaska, foxes. All introduced by humans to provide recreation or because they like them.