Lecture 6 - Ecosystems and Environmental Interactions Flashcards
Plant distributions are in… scales
Local, national and global scales.
Daisy is … in the UK
cosmopolitan
-Beltis perenis
Means control on its distribution hard to assess
Sea sandwort (Honchenya peploidis) is a .. plant and a … that loves …
It grows well in … and …
coastal, halophyte, salt
sands, shingles
Empetrum nigrum (crowberry) is a .... plant Cornus sanguina (dogweed) is a .... plant
These types of distribution are based on … influence and … distributions
northernly, southernly
climatic, complementary
Climatic factors include .. .. .. .. ..
temperature, rainfall, wind, light, humidity
Tundra are .. and .. precipitation
very cold, dry
Boreal forest are .. and .. precipitation
coldish and moderate preciptation
the lapse rate is when an … variable changes with altitude
atmospheric
the lapse rate for temperature is .. for each … increase in altitude
-6.5c, 1000m
edaphic factors relate to the ..
soil
the main functions of soil for plants is a … medium, source of .., source of ..
rooting, water, nutrients
-providing both conditions and resources for plants
excess resources do not always … growth, they can be … … growth
boost, supraoptimal
conditions are .. variables to which a plant responds, they … consumed and can help regulate .. availability
environmental, aren’t, resource
- E.g. pH
- E.g. Photosynthesis in arctic species may increase with more light up to a point
irraidiance is how .. something shines
brightly
whats indirect competition
when two species compete over the same shared resource
self thinning:
above a threshold of sowing density .. .. .. reach maturity
no more individuals
-reproductive output may also be reduced
density dependant population control occurs due to ..
competition
- E.g. Soybean mortality exponentially increases after 100m2
- E.g. Foxglobe
allopathy works by .. released by one plant .. growth of others
chemicals, limiting
- example of direct competition
- other examples include strangulation and parasitism
there are over … speices of parastic plant in .. families
3000, 17
.. of parasitic plants are hemiparasitic
these plants have .. but obtain some .. .. and .. from their host
80
chlorophyll, carbon, nutrients, water
.. of parasitic plants are holoparasitic
they have no … and obtain all their .. from host
20% (600 species)
chlorophyll, carbon
facilitation occurs when a plant .. from a …
especially important at .. environments , both high and low
beneifts, neighbour
extreme
the aspect influences … recieved
irradiance
-aspect is direction of slope
ammensalism has species 1 .. while species 2 is ..
losing, neutral
Empetrum hermaphroditum vs Pinus sylvestrus root competition, can be reduced via .. and ..
tubes, carbon
-carbon absrobs alleopathic compounds