INVESTIGADORES
COLAUTTI Dario Cesar
congresos y reuniones científicas
Título:
FIRST RESULTS ON FISH ASSEMBLAGES IN ANEGADA BAY (Argentina)
Autor/es:
MOLINA J,M.; LÓPEZ CAZORLA, A.; CUADRADO D.; LLOMPART, F.; COLAUTTI D C.; BAIGÚN, C.; SUQUELE, P.; CALVO, S.; OÑATIBIA, H.
Lugar:
Bahía Blanca
Reunión:
Simposio; Symposium -Estuarine and Coastal Sciences Association (Ecsa 44); 2008
Institución organizadora:
IADO-Estuarine and Coastal Sciences Association
Resumen:
Anegada Bay, located in Buenos Aires, Argentina has an important ecological value due to a
great biodiversity in a high environmental complexity. The present study shows preliminary
results from the structure of the fish assemblage in the southern region of this bay. The study
zone is characterized by a 27-m deep tidal channel where two stations were placed. One is closed
to an island on the northern flank, SB, where the bottom sediment is characteristically
unconsolidated sand. The other station was placed on the southern flank in Los Pocitos (LP), in
the inner part of the bay, where vegetated salt marshes and also consolidated fine-sand sediment
is found.
The surveys were performed seasonally during December 2007 May 2008, using gillnets. The
frequency of occurrence was estimated for each species. The diversity index (H) was calculated
in order to characterize the fish assemblage and evaluate spatial differences. During the three
surveys conducted, 17 species were registered, being Mustelus scmitti, Squatina sp., Odontesthes
argentinensis and Cynoscion guatucupa the most frequent (100%). From the total number of
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
argentinensis and Cynoscion guatucupa the most frequent (100%). From the total number of
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
in order to characterize the fish assemblage and evaluate spatial differences. During the three
surveys conducted, 17 species were registered, being Mustelus scmitti, Squatina sp., Odontesthes
argentinensis and Cynoscion guatucupa the most frequent (100%). From the total number of
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
argentinensis and Cynoscion guatucupa the most frequent (100%). From the total number of
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
H) was calculated
in order to characterize the fish assemblage and evaluate spatial differences. During the three
surveys conducted, 17 species were registered, being Mustelus scmitti, Squatina sp., Odontesthes
argentinensis and Cynoscion guatucupa the most frequent (100%). From the total number of
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
argentinensis and Cynoscion guatucupa the most frequent (100%). From the total number of
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
Mustelus scmitti, Squatina sp., Odontesthes
argentinensis and Cynoscion guatucupa the most frequent (100%). From the total number of
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community
and Cynoscion guatucupa the most frequent (100%). From the total number of
species captured, 88% were present in SB and 70% in LP. From the total, 41% appeared only in
one site, from which 29% were in SB and the 12% in LP. Diversity showed important spatial
differences: LP presents higher H values than SB, 1.9 and 1.1 respectively. Those differences
can be related with energy difference in the environment. While LP represents a low-energy
environment with finer bottom sediments, SB presents unconsolidated sand, a higher energy site.
These differences could affect the food supply for fish community