Aquatic Sciences Meeting, Albuquerque 2001
| SS42 American Fisheries Society/ASLO Joint Session: Scaling Fisheries From Egg to Adult and Back Again (Spatial and Temporal Connections) |
| Date: Wednesday, February 14, 2001, Time: 12:00:00 PM |
| Location: Sandia/Santa Ana |
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| O, M, , Memorial University of Newfoundland, St. John’s, Canada, omiriam@hotmail.com |
| Simmonds, N, J, Memorial University of Newfoundland, St. John’s, Canada, a52njs@morgan.ucs.mun.ca |
| Schneider, D, C, Memorial University of Newfoundland, St. John’s, Canada, a84dcs@morgan.ucs.mun.ca |
| Gregory, R, S, Memorial University of Newfoundland, St. John’s, Canada, rgregory@morgan.ucs.mun.ca |
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| QUANTIFYING JUVENILE ATLANTIC COD HABITAT ACROSS SPATIAL SCALES |
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| It is widely accepted that large-scale spatial dynamics of natural populations cannot be directly rescaled from small-scale measurements. This is a problem for many studies of fish populations, which explore small-scale relationships of abundance and mortality with habitat. Predictions of population level dynamics using small-scale relationships require quantification of habitat across multiple spatial scales. Eelgrass habitats are important nurseries for juvenile Atlantic cod, providing refuge from predators. In this study, we investigated the distribution of eelgrass habitat using CASI remotely sensed imagery. We quantified eelgrass habitat using a box-counting method at several measurement scales. Habitat availability estimates depended on the criteria chosen to determine the presence or absence of eelgrass habitat within pixels (i.e. the threshold rule), and the parameter measured (e.g. count, percent cover, nearest neighbor, patch size frequency). Because the ability to accurately quantify habitat across spatial scales is dependent on the parameter, a biologically relevant measurement of habitat is critical for the scale-up of fish population dynamics. Using this approach we have predicted juvenile cod abundance in relation to habitat complexity across spatial scales. |
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