Journal article
Density-dependent, landscape, and climate effects on spawning distribution of walleye pollock Theragra chalcogramma
Marine ecology. Progress series (Halstenbek), Vol.391, pp.1-12
01/01/2009
DOI: 10.3354/meps08259
Abstract
Little is known about the ways in which density-dependent and density-independent factors influence the spatial dynamics of fish spawning, despite their importance for egg and larval development, survival, and, ultimately, recruitment. Using 2 novel approaches, we related the spatial and temporal patterns of 28 yr of walleye pollock Theragra chalcogramma egg data in Shelikof Strait, Alaska, USA, to density-dependent, landscape, and climate effects. First, we used a spatially explicit variable coefficient generalized additive model (GAM) to show that spawning biomass, water temperature, and ocean transport each had unique spatial effects on walleye pollock egg density. Specifically, increased spawning biomass had a positive effect on egg density at the periphery of the core spawning area, inferring spawning area expansion at high spawning biomass and contraction at low levels. Moreover, increased Shelikof Strait transport caused pollock egg density to increase at the downstream edge of the core spawning area and decrease at the upstream edge. To test the validity of the variable coefficient GAM we also used a geometric method that related the area and center of mass of the pollock spawning aggregation to spawning biomass, transport, and temperature in annual time steps. The area of the spawning aggregation was positively related to spawning biomass, but not to transport or temperature. Variable coefficient GAMs are a useful tool to disentangle the spatially explicit forces of density-dependent and density-independent processes on fish populations.
Details
- Title: Subtitle
- Density-dependent, landscape, and climate effects on spawning distribution of walleye pollock Theragra chalcogramma
- Creators
- Nathan M Bacheler - University of Wisconsin–Green BayKevin M Bailey - NOAA Fisheries, Alaska Fisheries Sci Ctr, Seattle, WA 98115 USALorenzo Ciannelli - Oregon State UniversityValerio Bartolino - Oregon State UniversityKung-Sik Chan - Univ Iowa, Dept Stat & Actuarial Sci, Iowa City, IA 52242 USA
- Resource Type
- Journal article
- Publication Details
- Marine ecology. Progress series (Halstenbek), Vol.391, pp.1-12
- Publisher
- INTER-RESEARCH
- DOI
- 10.3354/meps08259
- ISSN
- 0171-8630
- eISSN
- 1616-1599
- Number of pages
- 12
- Grant note
- 220 / NPRB Publication EcoFOCI-723 / NOAA's Ecosystems and Fisheries -Oceanography Coordinated Investigations Essential Fish Habitat program of the Alaska Regional Office and Alaska Fisheries Science Center BEST-BSIERP Publication North Pacific Research Board (NPRB)
- Language
- English
- Date published
- 01/01/2009
- Academic Unit
- Statistics and Actuarial Science; Radiology
- Record Identifier
- 9984257623702771
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