. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY 327 I 160-, .5 120-1 o •_ <u 80- § 40 o c/: JD E 3 C C 100 200 300 400 Nload(kgNhaV) 30 -, 120-. G JH — OJJ C •— O H 20- 10- 100 200 300 400 0 100 200 300 400 N load (kg Nha'y"1) Figure 1. .-1 verage number of shrimp collected per seine low± SE is plotted as a function of nitrogen loading (top panel). Species composition is stack-plotted as a function of increasing nitrogen loading (bottom left panel). Average total length ± SE for each of three age classes ofC. septems- pinosus is plotted versus nitrogen loa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY 327 I 160-, .5 120-1 o •_ <u 80- § 40 o c/: JD E 3 C C 100 200 300 400 Nload(kgNhaV) 30 -, 120-. G JH — OJJ C •— O H 20- 10- 100 200 300 400 0 100 200 300 400 N load (kg Nha'y"1) Figure 1. .-1 verage number of shrimp collected per seine low± SE is plotted as a function of nitrogen loading (top panel). Species composition is stack-plotted as a function of increasing nitrogen loading (bottom left panel). Average total length ± SE for each of three age classes ofC. septems- pinosus is plotted versus nitrogen loading (bottom right panel). Straight lines are included only when the regression of length versus nitrogen load was significant. Age group I: triangles; age group _. diamonds; ugc group 3: squares. Reference: Biol. Bull. 191: 327-328. (October. 1996) Growth Rates of Ribbed Mussels in Six Estuaries Subject to Different Nutrient Loads Noah Feinstein, Stephanie Yelenik, James McClelland, and Ivan Valiela (Boston University Marine Program, Marine Biological Laboratory) Atlantic ribbed mussels (Geukensia demissa) inhabit the in- tertidal zone in estuarine salt marshes and feed by filtering phy- toplankton and particulate organic matter (POM) from the wa- ter (1). Nutrients from anthropogenic sources are stimulating production of organic matter in estuaries worldwide (2). To test the possible effect of nitrogen loading on the growth of ribbed mussels, we examined age-specific growth rates of mussel pop- ulations growing in six estuaries of Waquoit Bay, Massachu- setts, that are subject to different nitrogen loads. We hypothe- sized that growth of mussels depends on food supply, therefore increased organic matter production due to nitrogen loading should accelerate mussel growth. We sampled 35-50 mussels from each estuary, each sample representing the range of shell length (>8 mm) and age (> 1 year) of the source estuary. Mussels were taken from creek bank in the 15-cm
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
