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  1. Article ; Online: Leveraging co-production within ecosystem restoration to maximize benefits to coastal birds.

    Windhoffer, Eva D / Carruthers, Tim J B / Henkel, Jessica / Gleason, Jeffrey S / Wiebe, Jon J

    Journal of environmental management

    2024  Volume 360, Page(s) 121093

    Abstract: Coastal Louisiana's ecosystems are threatened by anthropogenic factors exacerbated by climate change induced sea-level rise. The 2010 Deepwater Horizon oil spill resulted in injuries and deaths to coastal birds in Louisiana, and the ongoing loss of ... ...

    Abstract Coastal Louisiana's ecosystems are threatened by anthropogenic factors exacerbated by climate change induced sea-level rise. The 2010 Deepwater Horizon oil spill resulted in injuries and deaths to coastal birds in Louisiana, and the ongoing loss of habitat has limited the potential for successful nesting of resident birds throughout the coast. Habitat loss is being addressed through increased large-scale ecosystem restoration as a result of settlement funds from the Deepwater Horizon oil spill. To further inform bird restoration in Louisiana, an avian restoration guidance document (Guidance for Coastal Ecosystem Restoration and Monitoring to Create or Improve Bird-NestingHabitat, 2023) was developed to maximize restoration benefits for coastal breeding birds while also achieving broader habitat restoration objectives. The developed restoration guidance was co-produced by subject-matter experts and professionals, including avian experts, engineers, and coastal restoration project managers. The result of this cross-disciplinary effort was specific and targeted guidance that presents designable habitat features that are in the control of project engineers and are also important high-value bird nesting habitats (e.g., shoreline access, elevation heterogeneity and edge habitat). For the first time in Louisiana, defined nest-site characteristics and monitoring approaches are readily available to inform ecosystem restoration project implementation. The restoration document specifically emphasizes bird species that breed and nest in coastal habitats in Louisiana, and restoration managers can use these guidelines to explicitly incorporate bird nesting habitat features into coastal restoration planning, design, and implementation. In developing this guidance, many knowledge gaps and data needs were identified specific to engineering and project design, enabling the research community to frame research questions around specific coastal restoration questions. The co-production of science model applied here for avian resources is applicable to a wide range of other living marine resources that may benefit from large-scale ecosystem restoration and is an example of the benefits of working relationships, communications, and common goal setting.
    Language English
    Publishing date 2024-05-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2024.121093
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Comparisons of Population Structure and Morphology of a Saltmarsh Keystone Species (Malaclemys terrapin) Across Coastal Louisiana

    Selman, Will / Pearson, Steven H / Wiebe, Jon J

    Estuaries and coasts. 2019 June, v. 42, no. 4

    2019  

    Abstract: Diamondback terrapins (Malaclemys terrapin) are an ecologically important species in salt marsh habitats, and they occur along the Gulf of Mexico and the Atlantic coastlines of the USA. Terrapins are subjected to a myriad of threats including loss of ... ...

    Abstract Diamondback terrapins (Malaclemys terrapin) are an ecologically important species in salt marsh habitats, and they occur along the Gulf of Mexico and the Atlantic coastlines of the USA. Terrapins are subjected to a myriad of threats including loss of coastal marsh/nesting habitat and differential adult mortality in fisheries bycatch. In Louisiana, knowledge of terrapin populations is lacking even though they likely face these same threats. To address this knowledge gap, we sampled terrapins across coastal Louisiana from 2011 to 2015 using unbaited fyke nets at six study sites. We sexed all individuals and measured morphometric characters (including plastron length, PL and carapace height, CH). We captured 1111 individuals at all sites, and each site was represented by ≥ 96 individuals. Skewed sex ratios were found at five of the six sites, while three of the six populations were lacking individuals in the 13–15 cm PL size classes. Male and female PL varied, with Chenier Plain males being larger than Deltaic Plain males, while Deltaic Plain females were larger than Chenier Plain females. Similarly, CH also varied, with Deltaic Plain males and females being relatively deeper than individuals from the Chenier Plain. A number of biotic, abiotic, and anthropogenic factors likely interplay to influence population structure, shell morphology, and demographics. However, the latter, including bycatch in crab traps, is possibly influencing terrapin population structure at some study sites via selective mortality of males and juvenile females. We suggest that future studies research the effects of anthropogenic factors on terrapin populations.
    Keywords Malaclemys terrapin ; adults ; bycatch ; coasts ; crabs ; demographic statistics ; females ; fyke nets ; habitats ; juveniles ; keystone species ; males ; morphometry ; mortality ; nesting ; population structure ; salt marshes ; sex ratio ; traps ; Gulf of Mexico ; Louisiana
    Language English
    Dates of publication 2019-06
    Size p. 1138-1148.
    Publishing place Springer US
    Document type Article
    ZDB-ID 2229170-2
    ISSN 1559-2731 ; 1559-2723
    ISSN (online) 1559-2731
    ISSN 1559-2723
    DOI 10.1007/s12237-019-00548-8
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Nutrient and organochlorine pesticide concentrations in American alligator eggs and their associations with clutch viability.

    Rauschenberger, R Heath / Sepúlveda, Maria S / Wiebe, Jon J / Wiebe, Janet E / Honeyfield, Dale C / Gross, Timothy S

    Journal of aquatic animal health

    2010  Volume 21, Issue 4, Page(s) 249–261

    Abstract: Since the early 1900s, the lakes of the Ocklawaha basin in central Florida have experienced ecological degradation due to anthropogenic development. One species affected by this degradation is the American alligator Alligator mississippiensis, which has ... ...

    Abstract Since the early 1900s, the lakes of the Ocklawaha basin in central Florida have experienced ecological degradation due to anthropogenic development. One species affected by this degradation is the American alligator Alligator mississippiensis, which has suffered from poor clutch viability and embryo mortality. Although some studies indicate that organochlorine pesticides (OCPs) may be involved, OCPs do not account for all of the variation seen in hatch rates. Indeed, nutrition and non-OCP contaminants have been associated with developmental problems in fish and birds. Our study evaluated embryo mortality in alligators at reference and OCP-contaminated sites as a function of exposure to OCPs, polychlorinated biphenyls (PCBs), and polyaromatic hydrocarbons (PAHs), along with egg nutrients (Zn, Se, and vitamins A, E, and B1). The four-pronged study consisted of a case-control cohort study, an expanded field study, a topical egg treatment thiamine amelioration experiment, and a topical egg treatment thiamine antagonist experiment. The results from the two field studies suggested that the total thiamine levels in the eggs were positively associated with clutch viability and negatively associated with the lipid content and certain OCPs measured in egg yolks. In addition, PCBs, PAHs, Zn, Se, and vitamins A and E were not found to be associated with the observed clutch viability defects. The thiamine levels in the eggs explained 38% of the variation in clutch survival in the case-control cohort study and 27% in the expanded field study. The topical egg treatment experiments were successful in elevating the thiamine concentrations in the albumin but not the yolk. No significant differences were noted among treatment groups in either egg treatment experiment with respect to clutch survival. In summary, thiamine egg concentrations explain some of the variation in the clutch viability of free-ranging alligators, but the cause-effect relationships are still unclear.
    MeSH term(s) Alligators and Crocodiles ; Animals ; Case-Control Studies ; Cohort Studies ; Female ; Florida ; Fresh Water ; Hydrocarbons, Chlorinated ; Maternal Exposure/adverse effects ; Ovum/chemistry ; Ovum/drug effects ; Pesticides/chemistry ; Pesticides/toxicity ; Water Pollutants, Chemical/analysis ; Water Pollutants, Chemical/toxicity
    Chemical Substances Hydrocarbons, Chlorinated ; Pesticides ; Water Pollutants, Chemical
    Language English
    Publishing date 2010-03-10
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1019919-6
    ISSN 1548-8667 ; 0899-7659
    ISSN (online) 1548-8667
    ISSN 0899-7659
    DOI 10.1577/H07-051.1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Parental exposure to pesticides and poor clutch viability in American alligators.

    Rauschenberger, R Heath / Wiebe, Jon J / Sepúlveda, Maria S / Scarborough, Janet E / Gross, Timothy S

    Environmental science & technology

    2006  Volume 41, Issue 15, Page(s) 5559–5563

    Abstract: In central Florida, alligators (Alligator mississippiensis) inhabiting lakes contaminated with organochlorine pesticides (OCPs) produce eggs that have high OCP concentrations and low clutch viability (proportion of eggs in a clutch that yield a live ... ...

    Abstract In central Florida, alligators (Alligator mississippiensis) inhabiting lakes contaminated with organochlorine pesticides (OCPs) produce eggs that have high OCP concentrations and low clutch viability (proportion of eggs in a clutch that yield a live hatchling) compared to those from less contaminated lakes (reference lakes). However, a clear dose-response relationship has not been established between OCPs and poor clutch viability. In order to better elucidate a cause and effect relationship between OCP exposure and clutch viability, we conducted concurrent field and laboratory studies. Our field study reaffirmed that eggs of wild alligators from OCP-contaminated lakes and wetlands continue to have lower clutch viability and higher OCP burdens than eggs from reference lakes. Our field study also demonstrated that OCP egg burdens were strongly correlated with clutch viability for some of the OCP-contaminated sites, but not all. To better test causal relationships, a parental exposure study was conducted using captive adult alligators. Our laboratory study demonstrated that dietary exposure of captive alligators to an ecologically relevant OCP mixture caused alligators to produce eggs with higher OCP burdens and reduced clutch viability, as compared to the captive-control population. The experimentally induced egg burdens and clutch viability reductions were similar to those of wild alligators from OCP-contaminated sites. Our field and laboratory results suggest parental OCP exposure may be contributing to low clutch viability in wild alligators inhabiting OCP-contaminated habitats, raising some concern for endangered crocodilians living in OCP-contaminated habitats.
    MeSH term(s) Alligators and Crocodiles/physiology ; Animals ; Female ; Hydrocarbons, Chlorinated/analysis ; Maternal Exposure/adverse effects ; Ovum/chemistry ; Ovum/physiology ; Pesticides/adverse effects ; Pesticides/analysis ; Survival Analysis ; United States ; Water Pollutants, Chemical/analysis
    Chemical Substances Hydrocarbons, Chlorinated ; Pesticides ; Water Pollutants, Chemical
    Language English
    Publishing date 2006-01-30
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ISSN 0013-936X
    ISSN 0013-936X
    DOI 10.1021/es0628194
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Predicting maternal body burdens of organochlorine pesticides from eggs and evidence of maternal transfer in Alligator mississippiensis.

    Rauschenberger, Richard H / Sepúlveda, María S / Wiebe, Jon J / Szabo, Nancy J / Gross, Timothy S

    Environmental toxicology and chemistry

    2004  Volume 23, Issue 12, Page(s) 2906–2915

    Abstract: Few data exist regarding maternal-embryonal transfer of organochlorine pesticides (OCPs) in reptiles. The objective of the present study was to evaluate maternal transfer of OCPs in American alligators (Alligator mississippiensis) from low-, intermediate- ...

    Abstract Few data exist regarding maternal-embryonal transfer of organochlorine pesticides (OCPs) in reptiles. The objective of the present study was to evaluate maternal transfer of OCPs in American alligators (Alligator mississippiensis) from low-, intermediate-, and high-OCP-exposure sites. Overall, total OCP burdens ranged from less than 0.8 ppb in blood to more than 44,000 ppb in abdominal adipose tissue (wet wt concentrations). Lipid-adjusted ratios of maternal adipose burdens (total OCPs) to yolk burdens were close to one (0.94 +/- 0.31:1), suggesting that animals were in steady state and that OCPs in eggs originated from adipose lipids. In contrast, lipid-adjusted muscle and liver OCP burdens were greater than yolk OCP burdens, suggesting that lipids in muscle were not utilized during oogenesis and that nonlipid liver tissue sequesters OCPs. Predictive equations were derived for several tissues and several OCP analytes with r2 values ranging from 0.40 to 0.99 (p < 0.05). We suggest that yolk burdens are predictive of maternal tissue burdens for certain tissues and OCPs and that certain OCPs are maternally transferred in the American alligator. Furthermore, we suggest that future studies should investigate the applicability of these predictive equations for assessing maternal exposure in other crocodilian species.
    MeSH term(s) Alligators and Crocodiles/blood ; Alligators and Crocodiles/metabolism ; Animals ; Bile/chemistry ; Body Burden ; Egg Yolk/chemistry ; Environmental Exposure ; Female ; Florida ; Fresh Water ; Hydrocarbons, Chlorinated/analysis ; Hydrocarbons, Chlorinated/blood ; Hydrocarbons, Chlorinated/metabolism ; Lipids/chemistry ; Liver/chemistry ; Muscles/chemistry ; Pesticides/analysis ; Pesticides/blood ; Pesticides/metabolism ; Tissue Distribution
    Chemical Substances Hydrocarbons, Chlorinated ; Lipids ; Pesticides
    Language English
    Publishing date 2004-08-26
    Publishing country United States
    Document type Comparative Study ; Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 46234-2
    ISSN 1552-8618 ; 0730-7268
    ISSN (online) 1552-8618
    ISSN 0730-7268
    DOI 10.1897/03-584.1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Organochlorine pesticides and thiamine in eggs of largemouth bass and American alligators and their relationship with early life-stage mortality.

    Sepúlveda, Maria S / Wiebe, Jon J / Honeyfield, Dale C / Rauschenberger, Heath R / Hinterkopf, Joy P / Johnson, William E / Gross, Timothy S

    Journal of wildlife diseases

    2004  Volume 40, Issue 4, Page(s) 782–786

    Abstract: Thiamine deficiency has been linked to early mortality syndrome in salmonids in the Great Lakes. This study was conducted to compare thiamine concentrations in American alligators (Alligator mississippiensis) and Florida largemouth bass (Micropterus ... ...

    Abstract Thiamine deficiency has been linked to early mortality syndrome in salmonids in the Great Lakes. This study was conducted to compare thiamine concentrations in American alligators (Alligator mississippiensis) and Florida largemouth bass (Micropterus salmoides floridanus) eggs from sites with high embryo mortality and high exposure to organochlorine pesticides (OCPs) (Lakes Apopka and Griffin, and Emeralda Marsh, Florida, USA) to those from sites that have historically exhibited low embryo mortality and low OCPs (Lakes Woodruff and Orange, Florida). During June-July 2000, 20 alligator clutches were collected from these sites, artificially incubated, and monitored for embryo mortality. Thiamine and OCPs were measured in one egg/clutch. During February 2002, 10 adult female bass were collected from Emeralda Marsh and Lake Woodruff and mature ovaries analyzed for thiamine and OCP concentrations. Although ovaries from the Emeralda Marsh bass contained almost 1,000-fold more OCPs compared with the reference site, Lake Woodruff, there were no differences in thiamine concentrations between sites (11,710 vs. 11,857 pmol/g). In contrast, alligator eggs from the reference site had five times the amount of thiamine compared with the contaminated sites (3,123 vs. 617 pmol/g). Similarly, clutches with >55% hatch rates had significantly higher concentrations of thiamine compared with clutches with <54% hatch rates (1,119 vs. 201 pmol/g). These results suggest that thiamine deficiency might be playing an important role in alligator embryo survival but not in reproductive failure and recruitment of largemouth bass. The cause(s) of this thiamine deficiency are unknown but might be related to differences in the nutritional value of prey items across the sites studied and/or to the presence of high concentration of contaminants in eggs.
    MeSH term(s) Alligators and Crocodiles ; Animals ; Bass ; Eggs/analysis ; Environmental Exposure ; Female ; Fish Diseases/chemically induced ; Fish Diseases/physiopathology ; Florida ; Hydrocarbons, Chlorinated/poisoning ; Maternal Exposure ; Mortality ; Ovum/chemistry ; Pesticides/poisoning ; Reproduction/drug effects ; Thiamine/metabolism ; Thiamine Deficiency/chemically induced ; Thiamine Deficiency/mortality ; Thiamine Deficiency/veterinary ; Water Pollutants, Chemical/poisoning
    Chemical Substances Hydrocarbons, Chlorinated ; Pesticides ; Water Pollutants, Chemical ; Thiamine (X66NSO3N35)
    Language English
    Publishing date 2004-10
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 410709-3
    ISSN 1943-3700 ; 0090-3558
    ISSN (online) 1943-3700
    ISSN 0090-3558
    DOI 10.7589/0090-3558-40.4.782
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Achieving environmentally relevant organochlorine pesticide concentrations in eggs through maternal exposure in Alligator mississippiensis.

    Rauschenberger, R Heath / Wiebe, Jon J / Buckland, Janet E / Smith, J Travis / Sepúlveda, Maria S / Gross, Timothy S

    Marine environmental research

    2004  Volume 58, Issue 2-5, Page(s) 851–856

    Abstract: Alligator mississippiensis eggs from organochlorine pesticide (OCP) contaminated sites in Florida exhibit high rates of embryonic mortality compared to reference sites (P < 0.05). The objective of the present study was to use captive adult alligators to ... ...

    Abstract Alligator mississippiensis eggs from organochlorine pesticide (OCP) contaminated sites in Florida exhibit high rates of embryonic mortality compared to reference sites (P < 0.05). The objective of the present study was to use captive adult alligators to test the hypotheses that maternal exposure to OCPs results in increased OCP concentrations in eggs, and that increased exposure is associated with increased embryonic mortality. A total of 24 adult alligators (8 males and 16 females) were housed in eight pens. Eight females in four pens were dosed with a mixture of p,p'-DDE, toxaphene, dieldrin, and chlordane at a rate of 0.2+/-0.01 mg/kg/day for 274+/-8 days. Treated females produced eggs containing higher OCP concentrations (12,814+/-813 ng/g yolk) than controls (38+/-4 ng/g yolk). Eggs of treated females exhibited decreased viability (13+/-22%) as compared to controls (45+/-20%). Results indicated that 0.6% of administered OCPs were maternally transferred to the eggs of American alligators, and that maternal exposure is associated with decreased egg/embryo viability in this species.
    MeSH term(s) Alligators and Crocodiles/metabolism ; Alligators and Crocodiles/physiology ; Animals ; Female ; Florida ; Fresh Water ; Gas Chromatography-Mass Spectrometry ; Hydrocarbons, Chlorinated ; Injections, Intramuscular ; Injections, Intraperitoneal ; Insecticides/administration & dosage ; Insecticides/pharmacokinetics ; Insecticides/toxicity ; Male ; Maternal Exposure ; Mortality ; Ovum/metabolism ; Reproduction/drug effects ; Tissue Distribution
    Chemical Substances Hydrocarbons, Chlorinated ; Insecticides
    Language English
    Publishing date 2004-08
    Publishing country England
    Document type Comparative Study ; Journal Article ; Research Support, U.S. Gov't, P.H.S.
    ZDB-ID 1502505-6
    ISSN 1879-0291 ; 0141-1136
    ISSN (online) 1879-0291
    ISSN 0141-1136
    DOI 10.1016/j.marenvres.2004.03.104
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Population genetics of the diamondback terrapin, Malaclemys terrapin, in Louisiana

    Petre, Charlotte / Selman, Will / Kreiser, Brian / Pearson, Steven H. / Wiebe, Jon J.

    Conservation genetics

    Volume v. 16,, Issue no. 5

    Abstract: Previous population genetic studies of diamondback terrapins (Malaclemys terrapin) have typically focused on either the entire range or relatively small spatial scales. The Louisiana coastline contains vast salt marshes suitable for terrapins; however, ... ...

    Abstract Previous population genetic studies of diamondback terrapins (Malaclemys terrapin) have typically focused on either the entire range or relatively small spatial scales. The Louisiana coastline contains vast salt marshes suitable for terrapins; however, two major freshwater inputs (Atchafalaya River and Mississippi River Deltas) break up the seemingly contiguous habitat and may isolate populations of terrapins. To determine population genetic structure and connectivity of terrapins occupying Louisiana marshes, we collected 573 individuals from 26 study sites across the Louisiana coastline. Twelve microsatellite loci were used to evaluate population structure using standard genetic and spatially explicit approaches. Patterns of gene flow were examined via model testing, including those to determine if freshwater inputs serve as barriers to movement. We also assessed levels of genetic diversity, inferred the historical demography and estimated effective population sizes across our sampling. While we did not detect significant population structure, we found that terrapins are not panmictic, and demonstrated a pattern of isolation by distance along the Louisiana coastline. Genetic diversity in this study was comparable to the Atlantic coast, but was higher than other sites within the Gulf of Mexico. Though terrapins in eastern Louisiana were historically harvested and apparently experienced a genetic bottleneck, this is not reflected in estimates of effective population sizes. Although, there was no strong genetic structuring across Louisiana, historical differences and patterns of habitat loss suggest that it may be necessary to develop separate management strategies for the western and eastern portions of the state.
    Keywords demography ; habitats ; coasts ; gene flow ; microsatellite repeats ; habitat destruction ; population structure ; river deltas ; salt marshes ; genetic variation ; freshwater ; testing ; population size ; Emydidae ; population
    Language English
    Document type Article
    ISSN 1566-0621
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

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