Biologist
Email:
mbrown@usgs.gov
Office Phone:
352-264-3534
Fax:
352-378-4956
ORCID:
0000-0002-5580-137X
Location
7920 NW 71St Street
Gainesville
, FL
32653
US
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Bullseye snakehead, Channa marulius, was first detected in 2000 in the southern Florida town of Tamarac and has been expanding its geographic range. Environmental DNA (eDNA) analysis is a newly-developed technique used to non-invasively detect cryptic or low-density species, or those that are logistically difficult to study. Genetic material shed into the environment through tissue and body fluids is concentrated from water samples and analyzed for the presence of target species eDNA. To help delineate bullseye snakehead’s geographic range, we developed and validated a species-specific eDNA assay for both quantitative and droplet digital PCR (ddPCR). We then used ddPCR to assess 16 locations in southeast Florida...
Categories: Data;
Tags: Aquatic Biology,
Ecology,
Everglades,
Genetics,
Southern Florida, All tags...
USGS Science Data Catalog (SDC),
Wildlife Biology,
environment,
environmental DNA,
invasive species,
non-invasive monitoring,
occupancy estimate,
range delimitation, Fewer tags
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Cichlasoma dimerus was only recently discovered in Florida and little is known of its dispersal abilities and potential impacts. Many factors likely contribute to the variability in establishment and spread of non-native fishes in Florida, including biotic (e.g., predation and competition) and abiotic variables (e.g., cold tolerance, low-oxygen tolerance). Of the abiotic variables, cold tolerance is an important regulator of non-native fish geographic ranges in Florida. Its tolerance to cold temperatures is experimentally evaluated and available information on its biology and ecology was synthesized. In the cold-temperature tolerance experiment, temperature was lowered from 24 C by increments of 1 C per hour, mimicking...
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Seagrasses are highly productive ecosystems. A before-after-control-impact (BACI) design was used to examine effects of dredging on seagrasses and the animals that inhabit them. The control site North Biscayne Bay (NBB) and impacted site Port of Miami (POM) had seagrass densities decreased during the before, Fish and Invertebrate Assessment Network (FIAN) 2006-2011 and after, Faunal Monitoring Due to Harbor Dredging (FMHD) 2014-2016 studies. Turbidity levels increased at NBB and POM basins during the FMHD study, especially in 2016. Animal populations decreased significantly in NBB and POM in the FMHD study compared to the FIAN study. If seagrass communities are not stabilized, animal numbers will likely continue...
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The Black Acara, Cichlasoma bimaculatum (Linnaeus 1758), first reported as introduced to Florida in 1965, is distributed throughout Florida’s southern peninsula. Examination of live and preserved museum specimens of acara reveal a second species, the Chanchita, Cichlasoma dimerus (Heckel 1840) present in Florida since at least July 2000. A review of the relevant literature coupled with an examination of acara collected in Florida show the Black Acara and the Chanchita are most easily distinguished by number of anal fin spines, body and fin color, caudal fin pattern, and degree of pigment on the rim of the scales of the head and nape. The presence of Cichlasoma dimerus in central Florida springs habitat and the substantial...
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These data are meant to support a publication "Disentangling direct and indirect effects of extreme events on coastal wetland communities" in the Journal of Animal Ecology. This dataset contains both amphibian and fish observations based on our use of plastic minnow traps. Additionally we present (specific) conductance values observed during our trapping periods.
Categories: Data;
Tags: Aquatic Biology,
Ecology,
Panacea Unit,
St. Marks NWR,
USGS Science Data Catalog (SDC), All tags...
Wildlife Biology,
amphibian,
biota,
fish,
hurricane,
specific conductance,
storm surge, Fewer tags
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