Page 24: of Marine Technology Magazine (March 2022)

LANDER LAB STUDYING NEARSHORE SUBMARINE CANYONS

Hardy for Natalya Gallo (Gallo et al., 2020

org/10.5194/bg-17-3943-2020>; Global Ocean Designs LLC) in 2016. The Picolander, DOV JEAN was developed by Kevin

Hardy with Maré Sutphen, now an undergraduate engineering student at CalPoly-San Luis Obispo. The camera and lights systems of both landers were developed by Kevin Hardy with

Ashley Nicoll.

Six successful exploratory deployments were conducted with the Picolander (Fig. 3). These deployments ranged in length from 26 to 51 hours and targeted depths from 100 to 500 m.

Five successful deployments of eight to 12 days were con- ducted with DOV BEEBE. DOV BEEBE re-occupied deploy-

Image credit: Ashley Nicoll ments sites from the Picolander except for one site, Pico-D370.

For all deployments, the camera was set to record video for 20 seconds every 20 minutes.

RESULTS

A Venn diagram displaying the number of La Jolla

We found that communities at 100 and 500m were distinct

Canyon specimens in the Marine Vertebrate Collection from all other depths while the 300m community was transi- (MVC) at Scripps Institution of Oceanography (SIO) and

Figure 4. tional between these depths and had the highest diversity, de- the number of ? sh species observed by the landers in the La Jolla Canyon. The overlapping zone represents spite unexpectedly high turbidity. common species between the two methods.

Additionally, we recorded clear diurnal patterns in ? shes

Photos of the landers upon deployment and/or recovery: a) Nanolander DOV BEEBE in a small skiff; b) DOV BEEBE ? oating in the

Figure 5. water during a recovery; c) The surface expression of Picolander DOV LEVIN, and d) DOV BEEBE deployed at ~ 24 m (80ft).

A B

C D

Photos by Ashley Nicoll and Phil Zerofski, Scripps Institution of Oceanography/UCSD

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