. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY 319 Reference: Biol. Hull 191: 314-320. (October. 1996). Abundance and Age-Specific Growth Rates in Relation to Population Densities of Fundulus heteroclitus in VVaquoit Bay Estuaries Subject to Different Nitrogen Loads Erin LaBrecque, Cam Fritz, Joanna Tober, Peter J. Behr, and Ivan \ 'aliela (Boston University Marine Program, Marine Biological Laboratory) Coastal environments throughout the world are increasingly enriched with nitrogen (1), but there is only rudimentary knowledge about how nitrogen loading affects
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY 319 Reference: Biol. Hull 191: 314-320. (October. 1996). Abundance and Age-Specific Growth Rates in Relation to Population Densities of Fundulus heteroclitus in VVaquoit Bay Estuaries Subject to Different Nitrogen Loads Erin LaBrecque, Cam Fritz, Joanna Tober, Peter J. Behr, and Ivan \ 'aliela (Boston University Marine Program, Marine Biological Laboratory) Coastal environments throughout the world are increasingly enriched with nitrogen (1), but there is only rudimentary knowledge about how nitrogen loading affects fish communi- ties. The estuaries of Waquoit Bay. Massachusetts, receive different nitrogen-loading rates so that they provide the oppor- tunity to examine how fish communities respond to a range of nitrogen-loading rates. Our objectives were to define how population density and age-specific growth rates of the salt- marsh killifish, Fundulus hcleroclitm, were related to different nitrogen-loading rates. F. heteroclitus was chosen for this study for three reasons. First, it is the most abundant fish in Waquoit Bay (2). Second, food availability, and the related issue of population density, limit its growth rates (3). Third, it has a relatively small annual home range (4. 5) so that populations are likely to remain within a single estuary during their life spans. 40- 2 ± 1 Fish/ tow Sage Lot Pond o 7, 40- 120H Hamblin Pond. 4567 Length (cm) Childs River i i i— 9 10 11 40- o 20- 0 100 200 300 400 500 4-, t s x: S O 3- 1 0 100 200 300 400 500 N load (kg ha1 y ') Figure 1. (Top four graphs) Length-frequency histograms of Fundulus heteroclitus in Sage Lai Pond, Hamblin Pond. Quaslmel River, and Childs River. Numbers on lap Ictt of each histogram indicate number offish per two ± SE (Bottom left) Abundance oj'F. heteroclitus (±SE) in relation to different nitrogen-loading rales (y = *l(Pm-*, r = ). (Bottom right) Average growth rales for age groups 1-4 of F. heteroclitus
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