Identification_Information: Citation: Citation_Information: Originator: William Loftus (retired) Joel Trexler (Florida International University) Publication_Date: 2000 Title: Population Structure and Spatial Delineation of Consumer Communities in the Everglades Geospatial_Data_Presentation_Form: poster Online_Linkage: http://sofia.usgs.gov/projects/index.php?project_url=consume_comm Description: Abstract: The trophic ecology of Everglades fishes is poorly documented. In tropical-fish communities, hydrologic seasonality greatly affects patterns of food-resource use, such as local and long-range movements among habitats, seasonal changes in diets, diet specializations, the presence and seasonality of diet overlaps, etc. (Lowe-McConnell 1975; Winemiller 1989, 1990). We analyzed Everglades native and introduced fish diets to identify the most important invertebrate and plant prey, and to compare trophic positions of species within and among three habitats and two seasons (Fig. 1). We used the complementary techniques of stomach and stable isotope analysis for both instantaneous and time-integrated views of animal diets (Vander Zanden and Rasmussen 1996). We then compared diet patterns in the temperate Everglades fish community with those from seasonal aquatic systems in the tropics. We posed the following hypotheses in examining those patterns: 1: Herbivory and omnivory are common trophic states in the Everglades. 2: Seasonal changes in diets within a habitat are usual . 3: Specialization in diet is common; generalists are rare. 4: Diet overlap is highest during high-water periods when food is plentiful. This study is a first step in using data from across habitats and seasons for use in constructing a empirical food web for the Everglades marsh. Purpose: In modeling the dynamics of aquatic animal populations in southern Florida wetlands, the dispersal distances, rates of movements, and timing of movement are important but poorly understood. The small size of the wetland animals precludes the use of standard marking techniques for studying movement, and the large, open system of these wetlands makes recapturing marked animals improbable. Genetic markers, used to determine population structure, offer an indirect way of assessing the degree of movement and mixing in these populations, and the landscape-level patterns of animal movement. In a series of studies in this multi-year project, our objectives are to identify population structure of selected aquatic species in the Everglades and to estimate migration rate from genetic data on gene flow for incorporation in the ATLSS model. Data from studies on whether levee and canal systems act as barriers to dispersal of aquatic animals in the Everglades are applicable to the Restudy. We are also using genetic techniques to learn if populations of introduced Asian Swamp Eels have the same source of origin, thereby establishing whether new collection locations represent dispersal events or new introductions. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1977 Ending_Date: 1997 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -81.25 East_Bounding_Coordinate: -80.3 North_Bounding_Coordinate: 25.75 South_Bounding_Coordinate: 25 Keywords: Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: modeling Theme_Keyword: biology Theme_Keyword: fish Theme_Keyword: aquatic animals Theme_Keyword: hydroperiods Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: biota Theme_Keyword: environment Theme_Keyword: inlandWaters Theme_Keyword: 002 Theme_Keyword: 007 Theme_Keyword: 012 Place: Place_Keyword_Thesaurus: Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, DC, National Institute of Standards and Technology Place_Keyword: United States Place_Keyword: US Place: Place_Keyword_Thesaurus: U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, DC, NIST Place_Keyword: Florida Place_Keyword: FL Place: Place_Keyword_Thesaurus: Department of Commerce, 1990, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, FIPS 6-3, Washington, DC, National Institute of Standards and Technology Place_Keyword: Miami-Dade County Place_Keyword: Broward County Place: Place_Keyword_Thesaurus: USGS Geographic Names Information System Place_Keyword: Everglades National Park Place: Place_Keyword_Thesaurus: none Place_Keyword: Central Everglades Place_Keyword: ENP Access_Constraints: none Use_Constraints: none Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Joel Trexler Contact_Organization: Florida International University, Department of Biological Sciences Contact_Address: Address_Type: mailing address Address: 11208 S.W. 8th Street City: Miami State_or_Province: FL Postal_Code: 33199 Country: USA Contact_Voice_Telephone: 305 348-1966 Contact_Facsimile_Telephone: 305 348-4032 Contact_Electronic_Mail_Address: trexlerj@fiu.edu Data_Set_Credit: We could not have completed this study without the efforts of Victoria Foster and Jennifer Rehage, who assisted in summarizing the raw data for analysis and in preparing the report and poster. Tom Atkeson, FL Department of Environmental Protection, provided funds that helped to complete the analysis. Cross_Reference: Citation_Information: Originator: Adams, S. M. Kimmel, B. L.; Plosky, G. R. Publication_Date: 1983 Title: Sources of organic matter for reservoir fish production: a trophic-dynamics analysis Geospatial_Data_Presentation_Form: report Series_Information: Series_Name: Canadian Journal of Fisheries and Aquatic Sciences Issue_Identification: v. 40, n. 9, p. 1480-1495 Publication_Information: Publication_Place: Ottawa, Ontario, Canada Publisher: National Research Council Canada Other_Citation_Details: accessed as of 11/8/2010 The full article is available via journal subscription or single article purchase. The abstract may be viewed on the website below Online_Linkage: http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=eng&journal=cjfas&volume=40&year=0&issue=9&msno=f83-170 Cross_Reference: Citation_Information: Originator: Lowe-McConnell, R. H. Publication_Date: 1975 Title: Fish communities in tropical freshwaters: their distribution, ecology, and evolution Geospatial_Data_Presentation_Form: book Publication_Information: Publication_Place: New York, NY Publisher: Longman, Inc Cross_Reference: Citation_Information: Originator: Vander Zanden, M. J. Rasmussen, J. B. Publication_Date: 1996 Title: A trophic position model of pelagic food webs: impact on contaminant bioaccumulation in lake trout Geospatial_Data_Presentation_Form: report Series_Information: Series_Name: Ecological Monographs Issue_Identification: v. 66, n. 4, p. 451-477 Publication_Information: Publication_Place: Washington, DC Publisher: Ecological Society of America Other_Citation_Details: accessed as of 11/8/2010 The full article is available via journal subscription or single article purchase. The abstract may be viewed on the website below Online_Linkage: http://www.jstor.org/pss/2963490 Cross_Reference: Citation_Information: Originator: Winemiller, K. O Publication_Date: 1989 Title: Otongenetic diet shifts and resource partitioning among piscivorous fishes in the Venezuelan llanos Geospatial_Data_Presentation_Form: report Series_Information: Series_Name: Environmental Biology of Fishes Issue_Identification: v. 26, n.3, p. 177-199 Publication_Information: Publication_Place: Dordrecht, The Netherlands Publisher: Springer Netherlands Other_Citation_Details: accessed as of 11/8/2010 Online_Linkage: http://www.springerlink.com/content/m43267581g4g7139/fulltext.pdf Cross_Reference: Citation_Information: Originator: Winemiller, K. O. Publication_Date: 1990 Title: Spatial and temporal variation in tropical fish networks Geospatial_Data_Presentation_Form: report Series_Information: Series_Name: Ecological Monographs Issue_Identification: v. 60, n. 3, p. 331-367 Publication_Information: Publication_Place: Washington, DC Publisher: Ecological Society of America Other_Citation_Details: accessed as of 11/8/2010 The full article is available via journal subscription or single article purchase. The abstract may be viewed on the website below Online_Linkage: http://www.esajournals.org/doi/abs/10.2307/1943061 Cross_Reference: Citation_Information: Originator: Winemiller, K. O. Publication_Date: 1996 Title: Factors driving temporal and spatial variation in aquatic floodplain food webs Geospatial_Data_Presentation_Form: book chapter Publication_Information: Publication_Place: New York, NY Publisher: Chapman and Hall Other_Citation_Details: in Food Webs: Integration of patterns and dynamics, G. A. Polis and K. O. Winemiller, eds Data_Quality_Information: Logical_Consistency_Report: Each species was separated into arbitrarily chosen size-groups of ~ 25 fish; length and wet mass recorded. Completeness_Report: Approximately 4000 specimens of 26 native fishes collected by rotenone, nets, angling, and electrofishing from 1977-1981 were supplemented by 6 introduced species during 1995-1997. Lineage: Process_Step: Process_Description: Approximately 4,000 specimens of 26 native fishes collected by rotenone, nets, angling, and electrofishing from 1977-1981 were supplemented by 6 introduced species during 1995-1997. Each species was separated into arbitrarily chosen size-groups of ~ 25 fish; length and wet mass recorded. Volumes were measured to 0.001ml using a blood-sedimentation tube; volume of digested prey not reconstructed; The small size of food items required the pooling of like items from each size-class of fish for volumetric analysis. Trophic Classification We grouped fishes into 5 Trophic Classes using continuous scores (tau symboli ) based on sums of prey scores, multiplied by the proportion of diet comprised by each prey type (Adams et al. 1983; Winemiller 1990). 1 = Mainly Herbivorous, >50% plant material (Score = 1.0 -1.74); 2 = Omnivorous, 25-50% plant material (Score = 1.75-2.19); 3 = Omnivorous, <25% Plant material (Score = 2.20-2.74); 4 = Omnivorous, mostly animal prey (Score = 2.75-2.99); 5 = Predominantly carnivorous, fish and decapods (Score = >3.0). The results were used to identify the most important invertebrate and plant prey and to compare trophic positions of species among and within 3 habitats (alligator pond, spike rush, and sawgrass) and two seasons (high-water and low-water periods). Process_Date: 2000 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Joel Trexler Contact_Organization: Florida International University, Department of Biological Sciences Contact_Address: Address_Type: mailing address Address: 11208 S.W. 8th Street City: Miami State_or_Province: FL Postal_Code: 33199 Country: USA Contact_Voice_Telephone: 305 348-1966 Contact_Facsimile_Telephone: 305 348-4032 Contact_Electronic_Mail_Address: trexlerj@fiu.edu Metadata_Reference_Information: Metadata_Date: 20101108 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Heather Henkel Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 600 Fourth Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: 727 803-8747 ext 3028 Contact_Facsimile_Telephone: 727 803-2030 Contact_Electronic_Mail_Address: sofia-metadata@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: The principal investigator for this project retired and the Point of Contact has declined to provide a review of the information in the metadata record. Any questions about the information should be directed to the Point of Contact under Citation Information or the Process Contact(s). This metadata record may have been copied from the SOFIA website and may not be the most recent version. Please check http://sofia.usgs.gov/metadata to be sure you have the most recent version.