. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B Figure 1. Detail of the field site map showing homing tracks of two lobsters, both stable residents of shelters near BR. A. On 7 September, a 56-mm CL male was released at the dock (D) at 23:24 h; he returned home (near BR) in 2 h, 12 min and remained there for at least 8 min, when observations were terminated; he continued to use his home shelter for several more weeks. B. On 16 September, a 51-mm CL female was released at D at 20:28 h; she did not return home (near BR) in the observation time (3 h, 10 min), but was found
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. B Figure 1. Detail of the field site map showing homing tracks of two lobsters, both stable residents of shelters near BR. A. On 7 September, a 56-mm CL male was released at the dock (D) at 23:24 h; he returned home (near BR) in 2 h, 12 min and remained there for at least 8 min, when observations were terminated; he continued to use his home shelter for several more weeks. B. On 16 September, a 51-mm CL female was released at D at 20:28 h; she did not return home (near BR) in the observation time (3 h, 10 min), but was found there the next day. She continued to be a stable resident in her home shelter. Dotted line: track lost. P indicates the 4 x 4 m chain link plot also seen in Figure 2. Circled points are fixed locations from which maps were drawn by triangulation. Results and Discussion In an attempt to determine if the animals were dis- turbed by our manipulations during marking, we com- pared the amount of time a lobster remained in the study site if it was caught at its shelter entrance versus caught when away from its shelter; we assumed that being caught near the shelter might pose a greater threat than being caught elsewhere. Disturbing the lobster near its shelter did not change the probability of its remaining in the study site nor the length of its stay (Chi-square, P > = 369). In two cases animals involved in pair formation prior to mating (see Courtship) were caught and marked. In both cases the animals continued cohabi- tation without any obvious disturbance. Also, resident animals fitted with battery packs for homing studies con- tinued to live in the same shelters. We concluded that our marking did not interfere seriously with lobster behavior. Shelter use In this shallow habitat, shelter appears to be critical since all animals spent much time inside shelter. During the day no lobsters were observed outside shelters. At night they were often seen bulldozing sand and
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
