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No. de sistema: 000010021

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040 _ _ a| ECO
c| ECO
043 _ _ a| n-mx-bs
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245 0 0 a| Variation in isotopic trophic structure and fish diversity in mangrove systems subject to different levels of habitat modification in the Gulf of California, Mexico
506 _ _ a| Acceso electrónico sólo para usuarios de ECOSUR
520 1 _ a| Anthropogenic modification of mangrove systems can lead to decreased habitat quality, potentially affecting food web structure and ecosystem function. Based on carbon and nitrogen stable isotopes, we evaluated the trophic structure of the fish communities from three mangrove systems in southern Baja California, Mexico, subject to varying levels of habitat modification. We hypothesized that anthropogenic habitat modification leads to differences in niche space (and hence trophic structure). We applied a Bayesian approach to the calculation of community level isotope-based metrics of functional trophic structure and compared the results to a structural (Shannon-Wiener) index of diversity. Frequency distributions of stable isotope ratios revealed differences between the highly modified mangrove system and those with limited or no habitat modification. Comparison of the isotopic composition of the dominant fish species sampled in summer and winter indicated limited seasonal differences in this arid region. However, isotope-derived metrics of niche space were evaluated in the most highly modified mangrove system, suggesting a greater complexity in nutrient and primary production sources, a higher level of dietary specialization, and low functional redundancy. Fishes from the most pristine mangrove system exhibited highest diversity, a more limited range of isotopic values, and smaller measures of isotopic niche space, indicative of higher trophic redundancy. Comparison of the standardized (baseline-controlled) species-specific isotope ratios indicated that in 37% of cases isotopic differences persisted, further supporting our interpretation of variations in trophic structure. This research highlights that mangrove habitat modification has a marked influence on functional trophic diversity, as well as the fish community structure.
650 _ 4 a| Ictiofauna
650 _ 4 a| Manglares
650 _ 4 a| Fragmentación de hábitats
650 _ 4 a| Isotopos de carbono
650 _ 4 a| Isótopos del nitrógeno
651 _ 4 a| Bahía de La Paz (Baja California Sur, México)
700 1 _ a| López Rasgado, Francisco Javier
n| 30067746000
700 1 _ a| Lluch Cota, Salvador E.
e| coaut.
700 1 _ a| Balart, Eduardo F.
e| coaut.
700 1 _ a| Herzka, Sharon Z.
e| coaut.
773 0 _
t| Bulletin of Marine Science
g| Vol. 92, no. 4 (October 2016), p. 399-422
x| 0007-4977
900 _ _ a| Solicítelo con su bibliotecario/a
901 _ _ a| Artículo con arbitraje
902 _ _ a| GOG / MM
904 _ _ a| Diciembre 2016
905 _ _ a| Artecosur
905 _ _ a| Biblioelectrónica
LNG eng
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*Solicítelo con su bibliotecario/a
Variation in isotopic trophic structure and fish diversity in mangrove systems subject to different levels of habitat modification in the Gulf of California, Mexico
López Rasgado, Francisco Javier (autor)
Lluch Cota, Salvador E. (autor)
Balart, Eduardo F. (autor)
Herzka, Sharon Z. (autor)
Nota: Acceso electrónico sólo para usuarios de ECOSUR
Contenido en: Bulletin of Marine Science. Vol. 92, no. 4 (October 2016), p. 399-422. ISSN: 0007-4977
No. de sistema: 10021
Tipo: - Artículo con arbitraje
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Inglés

"Anthropogenic modification of mangrove systems can lead to decreased habitat quality, potentially affecting food web structure and ecosystem function. Based on carbon and nitrogen stable isotopes, we evaluated the trophic structure of the fish communities from three mangrove systems in southern Baja California, Mexico, subject to varying levels of habitat modification. We hypothesized that anthropogenic habitat modification leads to differences in niche space (and hence trophic structure). We applied a Bayesian approach to the calculation of community level isotope-based metrics of functional trophic structure and compared the results to a structural (Shannon-Wiener) index of diversity. Frequency distributions of stable isotope ratios revealed differences between the highly modified mangrove system and those with limited or no habitat modification. Comparison of the isotopic composition of the dominant fish species sampled in summer and winter indicated limited seasonal differences in this arid region. However, isotope-derived metrics of niche space were evaluated in the most highly modified mangrove system, suggesting a greater complexity in nutrient and primary production sources, a higher level of dietary specialization, and low functional redundancy. Fishes from the most pristine mangrove system exhibited highest diversity, a more limited range of isotopic values, and smaller measures of isotopic niche space, indicative of higher trophic redundancy. Comparison of the standardized (baseline-controlled) species-specific isotope ratios indicated that in 37% of cases isotopic differences persisted, further supporting our interpretation of variations in trophic structure. This research highlights that mangrove habitat modification has a marked influence on functional trophic diversity, as well as the fish community structure."