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Seasonal And Vertical Distribution, Food Web Dynamics And Contaminant Biomagnification Of Cercopagis Pengoi In Lake Ontario, Joseph Makarewicz, Elizabeth Damaske, Corey Laxson, Hugh Macisaac, Ivan Grigorovich
Seasonal And Vertical Distribution, Food Web Dynamics And Contaminant Biomagnification Of Cercopagis Pengoi In Lake Ontario, Joseph Makarewicz, Elizabeth Damaske, Corey Laxson, Hugh Macisaac, Ivan Grigorovich
Joseph C Makarewicz
During the early growth season of 1999 to 2001, Cercopagis abundance in offshore waters of Lake Ontario remained low (less than 30 individuals/m3). From late July, its abundance increased rapidly until it peaked during August. After first appearing in 1998, maximum offshore abundance in Lake Ontario decreased each year since 1999 (1999:1759/m3; 2000: 679/m3; 2001: 355/m3). Cercopagis appears not to migrate below the thermocline and is restricted to the epilimnion. A comparison of pre- and post-invasion average abundance of Daphnia retrocurva, Bosmina longirostris and Diacyclops thomasi suggests that Cercopagis is having a major effect on zooplankton composition and abundance in …
Prevalence And Economic Value Of Feral Swine Damage To Native Habitat In Three Florida State Parks, Richard M. Engeman, Henry T. Smith, Stephanie A. Shwiff, Bernice Constantin, John Woolard, Mark Nelson, Daniel Griffin
Prevalence And Economic Value Of Feral Swine Damage To Native Habitat In Three Florida State Parks, Richard M. Engeman, Henry T. Smith, Stephanie A. Shwiff, Bernice Constantin, John Woolard, Mark Nelson, Daniel Griffin
Associate Professor Mark Nelson
Feral swine (Sus scrofa) adversely affect the environment in many of the places where they have been introduced. Such is the case in Florida, but quantification and economic evaluation of the damage can provide objective bases for developing strategies to protect habitats. Swine damage to native wet pine-flatwoods at three state parks in Florida was monitored from winter 2002 to winter 2003. Economic valuations of damage were based on the US dollar amounts that wetland regulators have allowed permit applicants to spend in attempts to replace lost resources. The parks had different swine management histories and the damage …