Term 2 Questions Flashcards

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1
Q

what technique has more detailed bathymetry

A

Multibeam echosonar

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2
Q

what are the types of direct techniques for marine surveys

A

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

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3
Q

what are the types of remote techniques for marine surveys

A

drop frame camera, towed camera, ROV, BRUV

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4
Q

what are the cons of sidescan sonars

A

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

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5
Q

what are the cons of using single beam scanners

A

takes longer and smaller area produced

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6
Q

why is GPS positioning in marine surveys important

A

provides sampling location, allows repeatability

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7
Q

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

A

phytoplankton species, wave conditions, light conditions, dynamics

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8
Q

what is measured from esturies

A

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

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9
Q

what are techniques to measure esturies

A

drogue buoy tracking, rhodamine dye tracing, dopplar current profiling

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10
Q

what does the acoustic dopple current profiling measure

A

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

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11
Q

why do power stations water have to be monitroed

A

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

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12
Q

why is the fal estruary important

A

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

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13
Q

why is marine conservation in the uk complicated

A

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

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14
Q

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

A

JNCC, forestry commision

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15
Q

what are the limitations of EMODnet

A

coverage is braodscale, usually poor resolution and patchy

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16
Q

what are the factors that the SSSI look for for conservation

A

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

17
Q

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

A

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

18
Q

what do you need to create a BRUV

A

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

19
Q

what are the ecological metrics taken from BRUVs

A

MaxN and species richness

20
Q

why is direct catch better than BRUVs

A

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

21
Q

what are the drawback of BRUVs

A

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)

22
Q

what are the pros for BRUVs

A

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

23
Q

what habitat of the Fal is highest complexity

A

rocky reef

24
Q
A