Ecological Archives E-082-033-A1

Garrick T. Skalski and James F. Gilliam. 2001. Functional responses with predator interference: viable alternatives to the Holling Type II model . Ecology 82:3083-3092.

Appendix A. Maximum likelihood parameter estimates (bootstrap 95% confidence intervals) for the nineteen data sets. For data set 5, the H2 model was accepted (c or m not different from zero for any of the predator-dependent models), and the H2 parameter estimates are shown. For the other data sets, the H2 model was rejected, and the parameters of the best-fit (greatest likelihood) predator-dependent model (BD, CM, or HV) are shown for each data set. H2 = Holling Type II model, BD = Beddington-DeAngelis model, CM = Crowley-Martin model, HV = Hassell-Varley model.
 
Data Set
Parameter Estimates
Sample Size
Best-Fit Model
 
a
b
c or m
   
Instantaneous Feeding Rates
1
0.0596

(0.0504, 0.0711)

0.0298

(0.0238, 0.0372)

0.0316

(0.0181, 0.0486)

5
BD or HV
2
0.8461

(0.6510, 1.202)

0.0752

(0.0482, 0.1221)

1.434

(0.9970, 2.063)

18
BD
3
2.087

(1.853, 2.363)

0.0244

(0.0172, 0.0329)

0.7296

(0.5795, 0.9345)

15
CM
4
0.0268

(0.0181, 0.0482)

0.0036

(0, 0.0203) 

0.2927

(0.0056, 1.159)

8
CM
5
0.0392

(0.0234, 0.0864)

0.0334

(0.0152, 0.0997)

0

n/a

8
H2
Integrated Feeding Rates
6
0.0312

(0.0248, 0.0409)

0.1557

(0.1187, 0.2116)

0.2442

(0.1757, 0.3429)

96
BD
7
0.0189

(0.0161, 0.0229)

0.0062

(0.0047, 0.0087)

0.1204

(0.0953, 0.1479)

75
CM
8
0.2338

(0.0839, 2.116)

0.0248

(0.0062, 0.2622)

1.197

(0.4042, 2.704)

15
HV
9
0.0106

(0.0079, 0.0156)

0.0581

(0.0406, 0.0852)

0.0566

(0.0374, 0.0903)

120
BD
10
0.0156

(0.0113, 0.0226)

0.0287

(0.0115, 0.0623)

0.1575

(0.0759, 0.3079)

20
CM
11
0.0402

(0.0358, 0.0464)

0.0576

(0.0478, 0.0708)

0.1017

(0.0833, 0.1239)

30
CM
12
0.1410

(0.1228, 0.1629)

0.1396

(0.1179, 0.1662)

0.3265

(0.1998, 0.4339)

30
HV
13
0.1625

(0.1324, 0.2086)

0.4353

(0.3423, 0.5766)

0.4790

(0.2256, 0.6905)

33
HV
14
0.0781

(0.0683, 0.0901)

0.0392

(0.0319, 0.0485)

0.2142

(0.1076, 0.3362)

19
BD
15
0.0595

(0.0388, 0.1113)

0.0541

(0.0285, 0.1218)

1.647

(0.9786, 3.172)

8
BD or HV
16
0.0113

(0.0066, 0.0247)

0.0087

(0.0045, 0.0219)

0.4503

(0.1377, 0.8164)

12
HV
17
0.0192

(0.0139, 0.0264)

0.0045

(0, 0.0125)

0.4105

(0.1418, 0.8497)

9
BD
18
0.0065

(0.0046, 0.0107)

0.0153

(0.0068, 0.0353)

1.206

(0.5829, 2.165)

21
BD
19
0.1706

(0.1390, 0.2188)

0.0965

(0.0640, 0.1469)

0.7227

(0.4796, 0.9621)

13
HV

Model fits identical to three decimal points. We report the parameter estimates for the BD model.

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