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926 results on '"Valiela, Ivan"'

6. Supporting Spartina : Interdisciplinary perspective shows Spartina as a distinct solid genus

Author

Bortolus, Alejandro, Adam, Paul, Adams, Janine B., Ainouche, Malika L., Ayres, Debra, Bertness, Mark D., Bouma, Tjeerd J., Bruno, John F., Caçador, Isabel, Carlton, James T., Castillo, Jesus M., Costa, Cesar S. B., Davy, Anthony J., Deegan, Linda, Duarte, Bernardo, Figueroa, Enrique, Gerwein, Joel, Gray, Alan J., Grosholz, Edwin D., Hacker, Sally D., Hughes, A. Randall, Mateos-Naranjo, Enrique, Mendelssohn, Irving A., Morris, James T., Muñoz-Rodríguez, Adolfo F., Nieva, Francisco J. J., Levin, Lisa A., Li, Bo, Liu, Wenwen, Pennings, Steven C., Pickart, Andrea, Redondo-Gómez, Susana, Richardson, David M., Salmon, Armel, Schwindt, Evangelina, Silliman, Brian R., Sotka, Erik E., Stace, Clive, Sytsma, Mark, Temmerman, Stijn, Turner, R. Eugene, Valiela, Ivan, Weinstein, Michael P., and Weis, Judith S.

Published
2019

14. Effects of urbanization of coastal watersheds on growth and condition of juvenile alewives in New England

Author

Pierce, Rita Monteiro, Limburg, Karin E., Hanacek, Daniella, and Valiela, Ivan

Subjects
Fishes -- Analysis -- Growth, Ponds -- Analysis, Urbanization -- Analysis, Company growth, Earth sciences
Abstract

Alosa pseudoharengus (alewife) has declined throughout New England. A factor that may be responsible for such stock reductions is urbanization of watersheds discharging into alewife nursery ponds. We found that young-of-the-year (YOY) alewife length, weight, condition factor, and growth rate decreased in relation to increased urban land cover on watersheds of nine Massachusetts and Maine ponds. The watersheds ranged from 3% to 60% urbanized land cover. YOY [delta][sup.15]N increased significantly in proportion to urbanized land cover on watersheds, suggesting a concrete link between watershed land cover and YOY alewife metrics, which is in agreement with previous knowledge that N discharges from more urbanized watersheds bear higher [delta][sup.15]N. The New England results confirmed results across a wide latitudinal gradient that suggested that the size of YOY alewife decreased as urban land cover on watersheds increased. The dominant influence of urban land cover in the YOY is highlighted by the fact that YOY alewife from ponds with the highest percentage of urban cover reached [delta][sup.15]N as high as that of adult spawners migrating from the ocean, who feed at higher trophic levels. Les gaspareaux (Alosa pseudoharengus) sont en declin partout en Nouvelle-Angleterre, et un facteur qui pourrait etre responsable de telles reductions des stocks est l'urbanisation des bassins versants des etangs d'alevinage des gaspareaux. Nous avons constate que les diminutions de la longueur, de la masse, de l'embonpoint et du taux de croissance des jeunes gaspareaux de l'annee sont reliees a une augmentation de la couverture urbaine dans les bassins versants de neuf etangs du Massachusetts et du Maine. La proportion de la couverture urbanisee des bassins versants va de 3 % a 60 %. Les valeurs de [delta][sup.15]N des jeunes de l'annee montrent une augmentation significative proportionnellement a la couverture urbanisee des bassins versants, indiquant un lien concret entre la couverture des bassins versants et des parametres associes aux gaspareaux de l'annee, ce qui concorde avec le fait deja etabli que les apports de N provenant de bassins versants plus urbanises ont des [delta][sup.15]N plus eleves. Ces resultats pour la Nouvelle-Angleterre corroborent des resultats obtenus le long d'un large gradient latitudinal qui donnaient a penser que la taille des gaspareaux de l'annee diminue parallelement a l'augmentation de la couverture urbaine dans les bassins versants. L'influence dominante qu'exerce cette derniere sur les jeunes de l'annee est toutefois mise en relief par le fait que les gaspareaux de l'annee issus d'etangs dont les bassins versants ont les plus hauts pourcentages de couverture urbaine ont des [delta][sup.15]N aussi eleves que ceux de geniteurs adultes migrant de l'ocean qui s'alimentent a des niveaux trophiques plus eleves. [Traduit par la Redaction], Introduction The alewife (Alosa pseudoharengus) once ranked among the most abundant species along the North American east coast, with individual populations estimated in the tens to hundreds of millions (Hall [...]

Published
2020
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