Loading...
Please wait, while we are loading the content...
Similar Documents
Cercopagis pengoi as a new prey item for alewife (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax) in Lake Ontario
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bushnoe, Tara M. Warner, David M. Rudstam, Lars G. Mills, Edward L. |
| Copyright Year | 2003 |
| Abstract | Diets of alewife (Alosa pseudoharengus) and rainbow smelt (Osmerus mordax) were examined before (1997) and after (1998 and 1999) the establishment of the predatory cladoceran Cercopagis pengoi in Lake Ontario. Cercopagis pengoi was absent in both fish stomachs and zooplankton samples in 1997, but by August 1998, its distribution was lake-wide and spines of this organism were present in stomachs of both fish species. Incidence of C. pengoi spines was highest in adult alewives. Spines occurred in 72, 100, and 90% of stomachs in August 1998, August 1999, and October 1999, respectively. Spines were found in 15 and 53% of YOY alewife stomachs in August 1998 and October 1999, respectively. Cercopagis pengoi spines were least common in rainbow smelt stomachs (12% in August 1998 and 6% in October 1999). Low frequency of occurrence in rainbow smelt likely resulted from limited spatial overlap with C. pengoi. No C. pengoi spines were found in alewives > 66 mm total length (TL) which suggests that consumption of C. pengoi by YOY alewife is limited by the long caudal spine. Low consumption of C. pengoi by YOY alewife may explain the remarkably rapid population increase of C. pengo i in Lake Ontario in 1998 in the presence of a strong alewife year class. These results indicate that C. pengoi is a competitor of YOY alewives for zooplankton during the summer but also a potential prey item for larger fish throughout the year and for YOY alewife in the fall. |
| Starting Page | 205 |
| Ending Page | 212 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/S0380-1330(03)70427-4 |
| Volume Number | 29 |
| Alternate Webpage(s) | http://www.reabic.net/Publ/Bushnoe_et%20al_2003_Alosa%20pseudoharengus_Osmerus%20mordax.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/S0380-1330%2803%2970427-4 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
