ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1572-9737
    Keywords: mtDNA ; Scaphirhynchus ; speciation ; sturgeon ; US Endangered Species Act
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The sturgeon genus Scaphirhynchus consists of threerecognized species. Pallid and shovelnose sturgeon (S. albusand S. platorynchus, respectively) are sympatric in theMissouri and lower Mississippi Rivers of the central United States. TheAlabama sturgeon (S. suttkusi) is endemic to the nearby MobileRiver drainage and is isolated geographically from the other twospecies. Pallid sturgeon and the extremely rare Alabama sturgeon arelisted as endangered under the US Endangered Species Act (ESA).In contrast, shovelnose sturgeon are relatively common and are notlisted. Despite these taxonomies and morphological evidence, somebiologists have questioned the genetic and taxonomic distinctions of thethree species, thus raising doubts concerning the validity of protectingpallid and Alabama sturgeon under the ESA. To investigate thesequestions, we compared a 436 base-pair sequence of the mitochondrial DNA(mtDNA) control region among the three species. We observed 16 mtDNAhaplotypes defined by 27 single base-pair substitutions (transitions)and one single base-pair insertion/deletion (indel) among 78individuals examined. The maximum sequence divergence among thosehaplotypes (2.06%) was less than values usually observed betweenfish species. However, Alabama sturgeon (n = 3) weredistinguished from the other two taxa (n = 75) by aunique base-pair substitution and haplotype, and pallid and shovelnosesturgeon at their northern range of natural sympatry (upper MissouriRiver) did not share any haplotypes. On the other hand, only frequencydifferences among shared haplotypes distinguished (P 〈 0.01)pallid and shovelnose sturgeon at their southern range of naturalsympatry (Atchafalaya River), and genetic distances between northern andsouthern localities for each species were nearly as large as thedistances between species. These latter results are consistent withseveral hypotheses, including reports (based on morphology) of putativenatural hybrids in the Atchafalaya River but not in the upper MissouriRiver. Overall, these mtDNA results indicate significant reproductiveisolation between pallid and shovelnose sturgeon in areas of naturalsympatry, and recent evolutionary divergence of Alabama sturgeon. ThesemtDNA results provide the first molecular genetic evidence fordistinguishing the three Scaphirhynchus species and, coupledwith morphological and biogeographic data, indicate that pallid andAlabama sturgeon should be evaluated as distinct species under theESA.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    facet.materialart.
    Unknown
    In:  http://aquaticcommons.org/id/eprint/15236 | 403 | 2014-06-01 18:54:03 | 15236 | United States National Marine Fisheries Service
    Publication Date: 2021-07-05
    Description: Loggerhead sea turtles (Caretta caretta) are migratory, long-lived, and slow maturing. They are difficult to study because they are seen rarely and their habitats range over vast stretches of the ocean. Movements of immature turtles between pelagic and coastal developmental habitats are particularly difficult to investigate because of inadequate tagging technologies and the difficulty in capturing significant numbers of turtles at sea. However, genetic markers found in mitochondrial DNA (mtDNA) provide a basis for predicting the origin of juvenile turtles in developmental habitats. Mixed stock analysis was used to determine which nesting populations were contributing individuals to a foraging aggregation of immature loggerhead turtles (mean 63.3 cm straight carapace length [SCL]) captured in coastal waters off Hutchinson Island, Florida. The results indicated that at least three different western Atlantic loggerhead sea turtle subpopulations contribute to this group: south Florida (69%), Mexico (20%), and northeast Florida-North Carolina (10%). The conservation and management of these immature sea turtles is complicated by their multinational genetic demographics.
    Keywords: Biology ; Chemistry ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 624-631
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 2022-05-26
    Description: On May 1 and 2, 2015, over 75 people attended the Northwest Atlantic Seal Research Consortium's first official biennial two day scientific meeting, "Seals and Ecosystem Health", at Salem State University in Salem, Massachusetts. The focus of the meeting was addressed by two keynote presentations: "Seals and Ecosystem Health" and "Marine mammals and ecosystem functioning: what can recovering seal populations teach us?" The first day of the meeting featured 16 oral and two poster presentations, covering a diverse range of topics highlighting the important underlying concepts, data gaps and future directions. Following the theme of the meeting, attendees discussed the nature of ecosystems, acknowledging the complex and often cryptic interactions between components, with cumulative and synergistic effects on animals and their environment. As our understanding of the ecological role of seals in the Northwest Atlantic grows, the cumulative interactions increase our recognition of seals as sentinels of ecosystem health. Meeting presentations highlighted the value of existing data and ongoing research efforts, including long-term population monitoring, tagging and photo-identification, stranding response, and rehabilitation facilities. The importance of observational effort was recognized as a critical component in detecting mortality events, documenting population processes in remote locations and cryptic species interactions. Research priorities identified included development of molecular tools for study of diet and disease, population dynamics studies (demographics and trends), telemetry-based investigations of spatiotemporal distribution, and model- and field-based ecosystem-level studies. Several of the presentations and the panel discussion, "Addressing Perception vs. Reality: How data (or lack of data) affects public perceptions and management decisions," highlighted the diverse and evolving perspectives with which society views seals, perspectives that are often biased by the backgrounds of individual humans. Diverse opinions necessitate engagement of stakeholders and the public, and societal objectives need to be defined in order to effect science-based natural resource management at an ecosystem level. At the closing of the meeting, recommendations from the panel discussion and for the overall goals of NASRC were discussed.
    Description: Funding was provided by the Woods Hole Oceanographic Institution Marine Mammal Center and the US Marine Mammal Commission
    Keywords: Seals ; Ecosystem health
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 1998-12-01
    Print ISSN: 1055-7903
    Electronic ISSN: 1095-9513
    Topics: Biology
    Published by Elsevier
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 2005-09-01
    Print ISSN: 0025-3162
    Electronic ISSN: 1432-1793
    Topics: Biology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...