15 April 2009

Studying Kin Conflict in the Elongate Twig Ant (Pseudomyrmex gracilis)

Volker Schmid, PhD student

University of Regensburg, Germany

My research topic is the social behaviour of ants, especially conflicts among members of the same colony. Because all ants within a colony are related to each other to a more or less high degree, each colony can be regarded as a kind of family. As in human families, conflicts may arise between individuals within a colony over certain matters: e.g. how many resources should be invested in the production of either female or male sexuals (those ants which spread out and reproduce, the females eventually founding new colonies); or who produces the male offspring, which is not necessarily only the queen. In the absence of a queen, evolutionary theory predicts that worker ants begin laying eggs which develop into males (workers usually cannot produce female offspring).

Elongate twig ant sucking honey placed on a leaf in the field (Curry Hammock State Park)
I will be testing this evolutionary theory on the Elongate Twig Ant (Pseudomyrmex gracilis). Native to Mexico, this species invaded Florida during the second half of the 20th century and can be found today at many locations in disturbed habitats or habitat edges (e.g. along roadsides). Using the Keys Marine Lab as my base of operations, I have collected colonies from various locations throughout the Florida Keys (Long Key State Park, Curry Hammock State Park, and Fort Zachery Taylor State Park). Captured colonies will be taken to Germany where I will continue observations of the social interactions and kin conflict of these ants.

10 April 2009

The rest of the KML fleet

R/V MolaMola
25' Parker, center console, modified-V hull
powered by 225hp Yamaha 4-stroke engine
large dive platform and sturdy dive ladder
capacity: 2200 lb or 11 passengers plus a captain





R/V NariNari
18' Parker center console,
powered by 175hp Yamaha 4-stroke engine
capacity: 1800 lb. or 5 passengers plus staff captain
Also available for use by KML scientists without staff captain on board. Inquire about requirements for our boat rental policy


13' Boston Whaler
capacity: 300 lbs or 2 people
powered by an electric start 25hp 4-stroke Mercury
For use near the lab (Long Key and nearshore waters) by KML scientists without staff captain on board




R/V Tiburo is back on the water

KML's R/V Tiburo has a new look these days. This grand old 24' T-Craft has been renovated, reconditioned, and is ready for trips back into Florida Bay. Powered by a 175hp Yahmaha engine, she has 1200 lb maximum capacity or 8 passengers plus a captain. "Tib" offers plenty of open deck space for portable live-wells and gear.



KML's Sea Water Tanks

KML's newly-renovated seawater tank farm is once again ready for education groups and researchers! Coarsely filtered seawater is drawn from the lagoon in front of the wetlab seawall... ...into a holding pond (formerly Shallows 4). Seawater is pulled from the holding pond to fill our various tanks. Over-flow from the holding pond runs directly to the large 220,000 gallon capacity Shallows (formerly Shallows 5) which has an average depth of 32".

We monitor water quality (temp, DO, salinity) daily from 4 locations around the lab: our marina basin, near-shore Florida Bay off our outer seawall, the lagoon near our intake point, and the Shallows. Dissolved oxygen readings in the Shallows have been consistently between 60% and 85% throughout the winter, in spite of dense mats of rack along the seawall.

Phase I of KML's seawater system offers a variety of tanks and wet tables with water flow rates ranging from 300 gal. per hr. to 600 gal. per hr. Water levels in the tanks and tables can be adjusted by variable stand-pipes.

Tanks and tables under lattice shade structure:

A total of 6 wet tables (23"W x 6'L) - 3 outside and 3 under the Wet Lab Pavilion, maximum water depth 8", approx. 60 gal. capacity; ideal for smaller specimens and student group observations


A total of 6 fiberglass tanks (foreground, 26"W x 4'L), maximum water depth 12"; approx. 75 gal. capacity
Two 6' diam. round fiberglass tanks (upper left), maximum water depth 24"; approx. 350 gal capacity
One 8' diam. round fiberglass tank (upper right), maximum water depth 36"; approx. 1100 gal. capacity


4 black livestock tanks (3'W x 5'L), maximum water depth 18"; approx. 1300 gal. capacity
Two 8' diam round tanks, maximum water depth 18", approx. 530 gal. capacity


Tanks exposed to full sunlight:

1 fiberglass raceway (8' long x 21" wide), maximum water depth 12", approx. 120 gal. capacity
4 fiberglass raceways (12' long x 21" wide), maximum water depth 12"; approx. 160 gal. capacity

We anticipate continuing to expand our seawater system to meet the needs of our visitors.