Trophic role of the humpback whale (Megaptera novaeangliae) in the feeding area of Magellan Strait, Chile

Daniela Haro, Pablo Sabat, Francisco Arreguín-Sánchez, Sergio Neira, Juan Carlos Hernández-Padilla

Resultado de la investigación: Contribución a una revistaArtículo

Resumen

The role of marine mammals in ecosystems has been evaluated mainly in species of high trophic level and results indicate that they influence the structure and functioning of biological communities. In this study the trophic role of the humpback whale was analyzed using an ecosystem model of the Francisco Coloane Coastal Marine Protected Area, Magellan Strait. The model was built with the Ecopath with Ecosim software that also allowed quantification of trophic interactions, predation mortality and prey consumption by the whales. Indices of network analysis were calculated and the removal of whales from this ecosystem was simulated. The humpback whale presented an intermediate trophic level of 3.4 and represented the most important predator for lobster krill and euphausiids, explaining 51% and 36% of total mortality in those groups, and the second predator in importance for the Fuegian sprat, after the long-tailed hake. Network analysis indicated that food web organization and development was determined by low trophic levels (i.e. phytoplankton and mesozooplankton), while fish played a major role in the transfer of energy. The removal of humpback whale biomass in the model produced a change in food web structure. This study approaches the trophic role of whales in Chilean waters for the first time, indicating that humpback whales in the Magellan Strait play a role in the maintenance of the ecosystem organization.

Idioma originalInglés
Número de artículo105796
PublicaciónEcological Indicators
Volumen109
DOI
EstadoPublicada - feb 2020

Huella dactilar

Megaptera novaeangliae
whale
Chile
strait
whales
ecosystems
food webs
trophic level
predators
ecosystem
network analysis
Euphausiacea
hake
krill
marine mammals
energy transfer
lobsters
food web
conservation areas
predator

Citar esto

Haro, Daniela ; Sabat, Pablo ; Arreguín-Sánchez, Francisco ; Neira, Sergio ; Hernández-Padilla, Juan Carlos. / Trophic role of the humpback whale (Megaptera novaeangliae) in the feeding area of Magellan Strait, Chile. En: Ecological Indicators. 2020 ; Vol. 109.
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abstract = "The role of marine mammals in ecosystems has been evaluated mainly in species of high trophic level and results indicate that they influence the structure and functioning of biological communities. In this study the trophic role of the humpback whale was analyzed using an ecosystem model of the Francisco Coloane Coastal Marine Protected Area, Magellan Strait. The model was built with the Ecopath with Ecosim software that also allowed quantification of trophic interactions, predation mortality and prey consumption by the whales. Indices of network analysis were calculated and the removal of whales from this ecosystem was simulated. The humpback whale presented an intermediate trophic level of 3.4 and represented the most important predator for lobster krill and euphausiids, explaining 51{\%} and 36{\%} of total mortality in those groups, and the second predator in importance for the Fuegian sprat, after the long-tailed hake. Network analysis indicated that food web organization and development was determined by low trophic levels (i.e. phytoplankton and mesozooplankton), while fish played a major role in the transfer of energy. The removal of humpback whale biomass in the model produced a change in food web structure. This study approaches the trophic role of whales in Chilean waters for the first time, indicating that humpback whales in the Magellan Strait play a role in the maintenance of the ecosystem organization.",
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Trophic role of the humpback whale (Megaptera novaeangliae) in the feeding area of Magellan Strait, Chile. / Haro, Daniela; Sabat, Pablo; Arreguín-Sánchez, Francisco; Neira, Sergio; Hernández-Padilla, Juan Carlos.

En: Ecological Indicators, Vol. 109, 105796, 02.2020.

Resultado de la investigación: Contribución a una revistaArtículo

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AU - Haro, Daniela

AU - Sabat, Pablo

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