. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 424 L. D. SMITH AND A. H. MINES. "nt. Figure 7. Histogram of the percentage of crabs missing or regenerating 1. 2, 3, or 4 or more limbs in the Rhode River. Maryland, from 1986 to 1989. the Rhode River, 11-17% of the population were missing or regenerating a single limb, while injury to two ap- pendages occurred less frequently (3-6%). Loss of three or more limbs was observed in less than of the pop- ulation in the Rhode River for any given year (Fig. 7). The maximum number of limbs missing or regenerating on a sin
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 424 L. D. SMITH AND A. H. MINES. "nt. Figure 7. Histogram of the percentage of crabs missing or regenerating 1. 2, 3, or 4 or more limbs in the Rhode River. Maryland, from 1986 to 1989. the Rhode River, 11-17% of the population were missing or regenerating a single limb, while injury to two ap- pendages occurred less frequently (3-6%). Loss of three or more limbs was observed in less than of the pop- ulation in the Rhode River for any given year (Fig. 7). The maximum number of limbs missing or regenerating on a single crab was six. The mean number of limbs lost ranged from to The proportion of numbers of limbs ( 1, 2, 3, >4) lost among crabs in the Rhode River did not differ among years (G2 = , 9 df, P > ). The relative numbers of limbs lost also did not differ among blue crabs in Alabama, Florida, upper- or lower- mid Chesapeake Bay (Fig. 8). In North Inlet, South Car- olina, single limb loss was proportionately higher than double limb loss when compared to other sites (STP test, P ) with the possible exception of the Rhode River in 1986. In that year, only 13% of the injured small crabs were missing or regenerating two or more limbs; medium (33%) and large (36%) crabs showed considerably higher levels of multiple autotomy (G-test, 2 df, P = ). Although comparatively rare, in all years in the Rhode River and at upper- and lower-mid Chesapeake Bay sites, multiple autotomy occurred more often than would be expected based on a binomial distribution in which: (1) the probability of losing any one limb was assumed equal, and (2) limbs were independent with respect to damage (Table IV). In contrast, observed and expected frequencies of single and multiple limb loss did not differ significantly at South Carolina, Florida, and Alabama sites. Observed and expected frequencies of limb loss were marginally non-significant (G-test, 2 df, P = ) in the Patuxent R
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