Differences in urbanization and degree of marine influence are reflected in δC and δN of producers and consumers in seagrass habitats of Puerto Rico - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Marine Environmental Research Année : 2010

Differences in urbanization and degree of marine influence are reflected in δC and δN of producers and consumers in seagrass habitats of Puerto Rico

Résumé

Couplings between land use and marine food webs in tropical systems are poorly understood. We compared land-sea coupling in seven sites around Puerto Rico, differing in the degree of precipitation and urbanization, by measuring δC and δN in producers and consumers. δN values were influenced by human activity: the food web from sites near urbanized centers was on average 1‰ heavier in δN compared to undeveloped sites. This is most likely due to wastewater inputs from septic systems relatively near the shoreline. Changes in δC were best explained by differences in the degree of marine influence. Where terrestrial inputs from a major river dominated, δC values were lighter, whereas sites further from land and in locations exposed to oceanic currents had heavier δC values, characteristic of a marine source of dissolved organic carbon. We found no significant effect of precipitation on connectivity in spite of a two-fold difference in annual average rainfall between the north and south coast. The results suggest there is some connectivity between land and sea in Puerto Rico, despite high rates of evaporation relative to precipitation.
Fichier principal
Vignette du fichier
PEER_stage2_10.1016%2Fj.marenvres.2009.10.005.pdf (863.68 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00565112 , version 1 (11-02-2011)

Identifiants

Citer

Ylva S. Olsen, Sophia E. Fox, Erin L. Kinney, Mirta Teichberg, Ivan Valiela. Differences in urbanization and degree of marine influence are reflected in δC and δN of producers and consumers in seagrass habitats of Puerto Rico. Marine Environmental Research, 2010, 69 (3), pp.198. ⟨10.1016/j.marenvres.2009.10.005⟩. ⟨hal-00565112⟩

Collections

PEER
56 Consultations
197 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More