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1,636 results for “marine species”

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dryad36/100

Fine-scale intraspecific niche partitioning in a highly mobile, marine megafauna species: implications for ecology and conservation

A species may partition its realized ecological niche along bionomic and/or scenopoetic axes due to intraspecific competition for limited resources. How partitioning manifests depends on resource needs and availability by and for the partitioning groups. Here we demonstrate the utility of analyzing short- and long-term stable carbon and nitrogen isotope ratios from imperiled marine megafauna to elucidate realized niche partitioning in these species. We captured 113 loggerhead (Caretta caretta) sea turtles at a high-use area near Crystal River, Florida, between 2016–2022, comprising 53 subadults, 10 adult males, and 50 adult females. Isotopic analyses indicated that loggerheads partition their realized ecological niche by life stage, along a scenopoetic axis. Most adults likely forage and reside in shallow areas of the study site, with most subadults displaying habitat switching between deeper locations to forage and shallower locations to rest. Some subadults, like adults, also forage and reside in shallow areas, and may display behaviors to avoid intraspecific competition. Analysis of stable isotopes with different turnover rates was critical for this characterization of intraspecific niche partitioning in loggerhead turtles, which has direct implications for ongoing research and conservation efforts for this and other imperiled species.

opencc-zeroJun 2023View details →

dryad36/100

Data from: Drop it all: Extraction-free detection of non-indigenous marine species through optimized direct-droplet digital PCR

Molecular biosecurity surveillance programs increasingly use environmental DNA (eDNA) for detecting marine non-indigenous species (NIS). However, the current molecular detection workflow is cumbersome, prone to errors and delays, and is limited in providing knowledge about eDNA beyond the spatial and temporal extent of the sampling. These limitations can hinder management efforts and restrict the "opportunity window" for a rapid response to new marine NIS incursions. Emerging innovative field-deployable digital droplet PCR (ddPCR) systems offer improved workflow efficiency by autonomously analyzing targeted free-floating extra-cellular eDNA (free-eDNA) signals. Despite their potential, these systems have not been tested in marine environments. Thus, an aquarium study was conducted with three distinct marine NIS: the Mediterranean fanworm Sabella spallanzanii, the ascidian clubbed tunicate Styela clava, and the brown bryozoan Bugula neritina to evaluate the detectability of free-eDNA in seawater. The detectability of targeted free-eDNA was assessed by directly analyzing aquarium water samples using an optimized species-specific ddPCR assay, without filtration or DNA extraction, so-called, "direct-ddPCR". The results demonstrated the consistent detection of Sabella spallanzanii and Bugula neritina free-eDNA when these organisms were present in high abundance. Once organisms were removed, the free-eDNA signal exponentially declined, noting that free-eDNA persisted between 24-72 hours. Results indicate that organism biomass, specimen characteristics (e.g., stress and viability), and species-specific biological differences may influence free-eDNA detectability. These results are critical for implementing in-situ nucleic acid automated continuous sensing systems for marine biosurveillance, enabling point-of-need detection and rapid management response to biosecurity threats.

opencc-zeroJul 2023View details →

zenodo36/100

Data from: Isotopic niche overlap among foraging marine turtle species in the Gulf of Mexico

R codes and corresponding dataset for "Isotopic niche overlap among foraging marine turtle species in the Gulf of Mexico" by Weber et al. for publication.  The "MasterDB" dataset contains the bulk stable isotope data (C, N, S) for loggerhead, green, and Kemp's ridley turtles sampled off the coast of Crystal River, Florida from 2016 to 2022. The "SIA_Values" dataset presents the data in the appropriate format for the nicheRover R package. Both metadata .csv files contain all metadata necessary for interpretation.

opencc-by-4.0Aug 2023View details →

dryad36/100

Widespread sympatry in a species-rich clade of marine fishes (Carangoidei)

A universal paradigm describing patterns of speciation across the tree of life has been debated for decades. In marine organisms, patterns of speciation are largely unknown due to the deficiency of species-level phylogenies and information on species' distributions, as well as conflicting relationships between species' dispersal, range size and co-occurrence. Most research on global patterns of marine fish speciation has focused on coral reef or pelagic species. Carangoidei is an ecologically important clade of marine fishes that utilize both coral reef and pelagic environments. We used sequence capture of 1314 ultraconserved elements (UCEs) from 154 taxa to generate a phylogeny of Carangoidei and its parent clade, Carangiformes. Age-range correlation analyses of the geographic distributions and divergence times of sister species pairs reveal widespread sympatry, with 73% of sister species pairs exhibiting a sympatric geographic distribution, regardless of node age, and most species pairs co-existing across large portions of their ranges. We also observe greater disparity in body size and water column depth utilization between sympatric than allopatric sister species. These and other ecological or behavioral attributes likely facilitate sympatry among the most closely related carangoids.

opencc-zeroOct 2023View details →

dryad36/100