Estuaries are productive ecosystems that provide important ecosystem functions such as the storag... more Estuaries are productive ecosystems that provide important ecosystem functions such as the storage and cycling of dissolved organic matter (DOM) and nutrients. Intermittently closed/open lakes and lagoons (ICOLLs) can significantly impact biogeochemical processing and release of terrestrial nitrogen and carbon into the coastal environment due to longer residence times that can extend nutrient processing within the ICOLL. Pulses of nutrient release then occur when there is connectivity between the catchment and coastal waters. It remains unclear how modifications to estuaries and their catchments impact internal processes. To better understand the balance between autochthonous and allochthonous nutrients in a heavily modified ICOLL, multiple stable isotopes (δ13C, δ15N) of dissolved nutrients were used to evaluate seasonal and spatial changes to nitrogen sources and sinks in a southwest Australian ICOLL. The eutrophic status of water bodies has traditionally been based on concentrati...
Microbes are ubiquitous but our knowledge of their effects on consumers is limited in benthic mar... more Microbes are ubiquitous but our knowledge of their effects on consumers is limited in benthic marine systems. Shorelines often form hotspots of microbial and detritivore activity due to the large amounts of detrital macrophytes that are exported from other coastal ecosystems, such as kelp forests, and accumulate in these systems. Shoreline ecosystems therefore provide a useful model system to examine microbial-detritivore interactions. We experimentally test whether bacteria in the biofilm of kelp provide a bottom-up influence on growth and reproductive output of detritivores in shorelines where detrital kelp accumulates, by manipulating the bacterial abundances on kelp (Ecklonia radiata). The growth rates for both male and female amphipods (Allorchestes compressa) were greater in treatments containing bacteria than those in which bacteria were reduced through antibiotic treatment, and this effect was greater for males offered aged kelp. The proportions of ovigerous females were gre...
The age structure, growth and reproductive biology have been determined for the recreationally an... more The age structure, growth and reproductive biology have been determined for the recreationally and commercially important King George whiting, Sillaginodes punctata, off southwestern Australia. The maximum lengths and ages, asymptotic lengths (L∞), and growth coefficients (K) were 596 mm, 14 years, 532 mm, and 0.47, respectively, for females, and 555 mm, 13 years, 500 mm and 0.53, respectively, for males. Sexual maturity is attained by 50% of female S. punctata by ca. 410 mm in length, and by the majority of both female and male fish at the end of their fourth year of life. The monthly trends in the proportions of mature gonads and the prevalence of different oocyte stages and postovulatory follicles indicated that, in southwestern Australia, S. punctata spawns from June to September. Spawning is thus initiated when water temperatures are declining from their maxima. During the spawning period, many of the ovaries of large fish contained yolk vesicle and yolk granule oocytes, as wel...
Humphries P Hyndes G a and Potter I C Comparisons Between the Diets of Distant Taxa in an Australian Estuary Estuaries 15 Pp 327 334, Sep 1, 1992
While most studies of the utilisation of food resources in aquatic ecosystems have focused on com... more While most studies of the utilisation of food resources in aquatic ecosystems have focused on comparing the diets of closely related taxa, the present study was aimed at elucidating whether the diets of five species, representing two distant taxa, were correlated and overlapped. We have thus compared the diets of a fish species (the flathead, Platycephalus speculator) with those of
... We are grateful to the team of staff and volunteers for their tireless support in the field a... more ... We are grateful to the team of staff and volunteers for their tireless support in the field and/or laboratory: A. Bostock, E. Crochelet, R. Czarnik, F. Dalaine, J. Eyres, M. Haywood, K. Inostroza, P. Kiss ... Adriana Vergés, Mathew A. Vanderklift, Christopher Doropoulos, Glenn A. Hyndes ...
Hyndes G a Potter I C and Lenanton R C J Habitat Partitioning By Whiting Species in Coastal Waters Environmental Biology of Fishes 45 Pp 21 40, 1996
Synopsis The ways in which the distributions of six species of whiting (Sillaginidae) in the coas... more Synopsis The ways in which the distributions of six species of whiting (Sillaginidae) in the coastal marine waters of south-western Australia are related to the type of substrate (bare sand vs. seagrass), degree of exposure of habitat, water depth and body size have been investigated. Whiting in near shore waters (Sillaginodes punctata, Sillago burrus, Sillago schomburgkii and Sillago vittata mainly
Hyndes G a Platell M E and Potter I C Relationships Between Diet and Body Size Mouth Morphology Habitat and Movements of Six Sillaginid Species in Coastal Waters Implications For Resource Partitioning Marine Biology 128 Pp 585 598, May 31, 1997
... are among the highest in the World, ranging from 300 to &... more ... are among the highest in the World, ranging from 300 to >1600 mg C m −2 day −1 , with nitrate concentrations in the order of 2.3 μmol and Chl a concentrations of 14 mg m −3 ([Delgadillo-Hinojosa et al., 1997], [Hidalgo-Gonzalez et al., 2005] and [Bustos-Serrano and Castro ...
Estuaries are productive ecosystems that provide important ecosystem functions such as the storag... more Estuaries are productive ecosystems that provide important ecosystem functions such as the storage and cycling of dissolved organic matter (DOM) and nutrients. Intermittently closed/open lakes and lagoons (ICOLLs) can significantly impact biogeochemical processing and release of terrestrial nitrogen and carbon into the coastal environment due to longer residence times that can extend nutrient processing within the ICOLL. Pulses of nutrient release then occur when there is connectivity between the catchment and coastal waters. It remains unclear how modifications to estuaries and their catchments impact internal processes. To better understand the balance between autochthonous and allochthonous nutrients in a heavily modified ICOLL, multiple stable isotopes (δ13C, δ15N) of dissolved nutrients were used to evaluate seasonal and spatial changes to nitrogen sources and sinks in a southwest Australian ICOLL. The eutrophic status of water bodies has traditionally been based on concentrati...
Microbes are ubiquitous but our knowledge of their effects on consumers is limited in benthic mar... more Microbes are ubiquitous but our knowledge of their effects on consumers is limited in benthic marine systems. Shorelines often form hotspots of microbial and detritivore activity due to the large amounts of detrital macrophytes that are exported from other coastal ecosystems, such as kelp forests, and accumulate in these systems. Shoreline ecosystems therefore provide a useful model system to examine microbial-detritivore interactions. We experimentally test whether bacteria in the biofilm of kelp provide a bottom-up influence on growth and reproductive output of detritivores in shorelines where detrital kelp accumulates, by manipulating the bacterial abundances on kelp (Ecklonia radiata). The growth rates for both male and female amphipods (Allorchestes compressa) were greater in treatments containing bacteria than those in which bacteria were reduced through antibiotic treatment, and this effect was greater for males offered aged kelp. The proportions of ovigerous females were gre...
The age structure, growth and reproductive biology have been determined for the recreationally an... more The age structure, growth and reproductive biology have been determined for the recreationally and commercially important King George whiting, Sillaginodes punctata, off southwestern Australia. The maximum lengths and ages, asymptotic lengths (L∞), and growth coefficients (K) were 596 mm, 14 years, 532 mm, and 0.47, respectively, for females, and 555 mm, 13 years, 500 mm and 0.53, respectively, for males. Sexual maturity is attained by 50% of female S. punctata by ca. 410 mm in length, and by the majority of both female and male fish at the end of their fourth year of life. The monthly trends in the proportions of mature gonads and the prevalence of different oocyte stages and postovulatory follicles indicated that, in southwestern Australia, S. punctata spawns from June to September. Spawning is thus initiated when water temperatures are declining from their maxima. During the spawning period, many of the ovaries of large fish contained yolk vesicle and yolk granule oocytes, as wel...
Humphries P Hyndes G a and Potter I C Comparisons Between the Diets of Distant Taxa in an Australian Estuary Estuaries 15 Pp 327 334, Sep 1, 1992
While most studies of the utilisation of food resources in aquatic ecosystems have focused on com... more While most studies of the utilisation of food resources in aquatic ecosystems have focused on comparing the diets of closely related taxa, the present study was aimed at elucidating whether the diets of five species, representing two distant taxa, were correlated and overlapped. We have thus compared the diets of a fish species (the flathead, Platycephalus speculator) with those of
... We are grateful to the team of staff and volunteers for their tireless support in the field a... more ... We are grateful to the team of staff and volunteers for their tireless support in the field and/or laboratory: A. Bostock, E. Crochelet, R. Czarnik, F. Dalaine, J. Eyres, M. Haywood, K. Inostroza, P. Kiss ... Adriana Vergés, Mathew A. Vanderklift, Christopher Doropoulos, Glenn A. Hyndes ...
Hyndes G a Potter I C and Lenanton R C J Habitat Partitioning By Whiting Species in Coastal Waters Environmental Biology of Fishes 45 Pp 21 40, 1996
Synopsis The ways in which the distributions of six species of whiting (Sillaginidae) in the coas... more Synopsis The ways in which the distributions of six species of whiting (Sillaginidae) in the coastal marine waters of south-western Australia are related to the type of substrate (bare sand vs. seagrass), degree of exposure of habitat, water depth and body size have been investigated. Whiting in near shore waters (Sillaginodes punctata, Sillago burrus, Sillago schomburgkii and Sillago vittata mainly
Hyndes G a Platell M E and Potter I C Relationships Between Diet and Body Size Mouth Morphology Habitat and Movements of Six Sillaginid Species in Coastal Waters Implications For Resource Partitioning Marine Biology 128 Pp 585 598, May 31, 1997
... are among the highest in the World, ranging from 300 to &... more ... are among the highest in the World, ranging from 300 to >1600 mg C m −2 day −1 , with nitrate concentrations in the order of 2.3 μmol and Chl a concentrations of 14 mg m −3 ([Delgadillo-Hinojosa et al., 1997], [Hidalgo-Gonzalez et al., 2005] and [Bustos-Serrano and Castro ...
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