Table 1.
Summary of the zero-inflated negative binomial model for marine debris counts (minimum number of marine debris items) reported from the Hawai’i-based pelagic longline fishery during 2008–2016.
| Variable | Estimate (β) |
Exp(β) | Std Error | z-value | p |
|---|---|---|---|---|---|
| Negative binomial count model | |||||
| Intercept | −11.06 | 1.57 × 10−5 | 0.55 | −20.22 | *** |
| 2009 | 0.17 | 1.18 | 0.14 | 1.28 | 0.202 |
| 2010 | 0.45 | 1.57 | 0.14 | 3.14 | ** |
| 2011 | 0.56 | 1.75 | 0.15 | 3.81 | **** |
| 2012 | −0.50 | 0.61 | 0.17 | −2.90 | *** |
| 2013 | 0.25 | 1.28 | 0.16 | 1.57 | 0.117 |
| 2014 | −0.001 | 1.00 | 0.16 | −0.009 | 0.993 |
| 2015 | (−0.13) | 0.88 | 0.18 | (−0.724) | 0.469 |
| 2016 | −0.46 | 0.63 | 0.23 | −2.03 | * |
| Quarter 2 | −0.09 | 0.91 | 0.11 | −0.86 | 0.39 |
| Quarter 3 | −0.41 | 0.66 | 0.12 | −3.33 | **** |
| Quarter 4 | −0.18 | 0.83 | 0.12 | −1.48 | 0.139 |
| Sector | (−0.52) | 0.59 | 0.15 | (−3.38) | **** |
| Latitude | 0.11 | 1.12 | 0.01 | 7.53 | **** |
| Logistic model for zero inflation | |||||
| Intercept | −5.15 | 0.01 | 0.90 | −5.76 | **** |
| Longitude | −0.05 | 0.95 | 0.005 | −9.43 | **** |
| Convergence zone (within) | −0.83 | 0.44 | 0.18 | −4.60 | **** |
| Observer (high) | −1.58 | 0.21 | 0.09 | −17.46 | **** |
| Sector (deep) | 0.82 | 2.27 | 0.13 | 6.34 | **** |
*Significant at p = 0.05, **significant at p = 0.01, ***significant at p = 0.001, ****significant at p = 0.0001. Reference year = 2008, reference quarter = 1.