Term 2 Questions

Question 1

what technique has more detailed bathymetry

Answer 1

Multibeam echosonar

Question 2

what are the types of direct techniques for marine surveys

Answer 2

benthic grabs, diver, dredges, trawls, traps, nets

Question 3

what are the types of remote techniques for marine surveys

Answer 3

drop frame camera, towed camera, ROV, BRUV

Question 4

what are the cons of sidescan sonars

Answer 4

can only be used in straight survey lines, data can be affected by current + swell

Question 5

what are the cons of using single beam scanners

Answer 5

takes longer and smaller area produced

Question 6

why is GPS positioning in marine surveys important

Answer 6

provides sampling location, allows repeatability

Question 7

what are factors that change in the esturary from saline to less

Answer 7

phytoplankton species, wave conditions, light conditions, dynamics

Question 8

what is measured from esturies

Answer 8

nutrients, sediment loads, orgnic material, pollutants + waste, larvae + spore transport

Question 9

what are techniques to measure esturies

Answer 9

drogue buoy tracking, rhodamine dye tracing, dopplar current profiling

Question 10

what does the acoustic dopple current profiling measure

Answer 10

water velocity + direction in either column or estury )to work out residence times)

Question 11

why do power stations water have to be monitroed

Answer 11

pumps warm water out, providing microclimate for invasive species to thrive

Question 12

why is the fal estruary important

Answer 12

county’s largest estuary,
important for maritime trade, tourism and conservation
(landscape, habitats and species)

Question 13

why is marine conservation in the uk complicated

Answer 13

different governments (wales scotland ect.) so difficult to coordinate

Question 14

who are the 2 key adivsing bodies for Uk governments on enviromental conservation

Answer 14

JNCC, forestry commision

Question 15

what are the limitations of EMODnet

Answer 15

coverage is braodscale, usually poor resolution and patchy

Question 16

what are the factors that the SSSI look for for conservation

Answer 16

typical;ness, fragility, size, diversity, naturalness, rarity, natrual coherence

Question 17

what are the features of the Fal that makes it a SAC

Answer 17

sandbanks + maerl beds, atlantic salt marshes, mudflats and large shallow inlets + bays

Question 18

what do you need to create a BRUV

Answer 18

camera, frame, bait cage, bait, weights, rope + buoy

Question 19

what are the ecological metrics taken from BRUVs

Answer 19

MaxN and species richness

Question 20

why is direct catch better than BRUVs

Answer 20

can track sp., measure size in detail, no repeats

Question 21

what are the drawback of BRUVs

Answer 21

difficult to tell if organism is repeat, difficult to measure size, frind relative abundance NOT TRUE abundance (underestimate), bias towards scavengers + preds, uncertainties of areas of influence (bait size plume)

Question 22

what are the pros for BRUVs

Answer 22

low impact, reveals cryptic sp., low cost, low risk

Question 23

what habitat of the Fal is highest complexity

Answer 23

rocky reef