Reddish Egret (Egretta rufescens)

Koczur, Lianne M.; Green, M. Clay; Ballard, Bart M.; Lowther, Peter E.; Paul, Richard T.

doi:10.2173/bna.redegr.02

Cited by 13 publications

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“…Sampling localities are grouped by previously defined management units (West, Central, and East). Mitochondrial haplotype for each individual is indicated below the bar plot America, and northern South America to the Bahamas ( Figure S1) (Koczur et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The Reddish Egret ( Egretta rufescens ) is one of the least studied herons in North America (Koczur et al., 2019). This plumage dimorphic species has experienced numerous threats and population reductions, especially during the late 19th and early 20th centuries (Paul, 1978).…”

Section: Introductionmentioning

confidence: 99%

“…Even though the global population is estimated between 5,000 to 7,000 breeding pairs (Green, 2006; Paul, 1991; Wilson, Wheeler, Green, & Palacios, 2014), the species remains threatened by coastal habitat loss and rising sea levels. Consequently, populations occur in disjunct areas across its range, which extends from Baja California throughout most of coastal Mexico, along the U.S. Gulf of Mexico, Central America, and northern South America to the Bahamas (Figure S1) (Koczur et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

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A re‐evaluation of management units based on gene flow of a rare waterbird in the Americas

et al. 2020

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The maintenance of gene flow in species that have experienced population contractions and are geographically fragmented is important to the maintenance of genetic variation and evolutionary potential; thus, gene flow is also important to conservation and management of these species. For example, the Reddish Egret (Egretta rufescens) has recovered after severe population reductions during the 19th and 20th centuries, but population numbers remain below historical levels. In this study, we characterized gene flow among management units of the Reddish Egret by using ten nuclear microsatellite markers and part of the mitochondrial (mtDNA) control region from 176 nestlings captured at eight localities in Mexico (Baja California, Chiapas, Tamaulipas, and Yucatan), the USA (Texas, Louisiana, and Florida), and the Bahamas. We found evidence of population structure and that males disperse more often and across longer distances compared with females, which is congruent with previous banding and telemetry data. The maternally inherited mtDNA and biparentally inherited microsatellite data supported slightly different MU models; however, when interpreted together, a four MU model that considered population structure and geographic proximity was most optimal. Namely, MU 1 (Baja California); MU 2 (Chiapas); MU 3 (Yucatan, Tamaulipas, Texas, and Louisiana); and MU 4 (Florida and the Bahamas). Regions outside our sampled localities (e.g., the Greater Antilles and South America) require additional sampling to fully understand gene flow and movement of individuals across the species' entire range. However, the four MUs we have defined group nesting localities into genetically similar subpopulations, which can guide future management plans.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A re‐evaluation of management units based on gene flow of a rare waterbird in the Americas

et al. 2020

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A spatial model for the beneficial use of dredge spoil deposition: Creation and management of breeding habitat for reddish egrets in Texas

Krainyk

Koczur

Ballard

2020

Journal of Environmental Management

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Genetic Diversity and Population Structure of Reddish Egrets Along the Texas Coast

2009

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This document provides a set of primer sequences for amplifying and sequencing the entire avian mitochondrial DNA. Most of the primers were originally developed as part of earlier studies (see refs) but many have since been revised or replaced with primers in different locations. All of the primers have been designed to work with most or all birds and most perform very well in this regard.This document is intended as a resource for those interested in using mtDNA for avian population genetics and systematics, whether that work involves sequencing complete mitochondrial genomes or single genes. A second goal is to encourage the use of genes other than cytochrome b, which is a poor choice for studies in which only one mitochondrial gene will be sequenced. If I'm going to sequence only one gene, which one should I choose? ND2! Why not cyt b?All mitochondrial protein genes have similarly high rates of substitution at 3 rd codon positions, but they vary greatly in the rate of amino acid substitution. Therefore, all mt protein genes provide similar information (per base pair sequenced) for very closely related taxa (e.g., individuals within a species) that differ primarily at degenerate 3 rd codon positions. For somewhat more distantly related taxa (including species within a genus, for example, and everything else up to and including comparisons between avian orders), more variable mt genes accumulate more informative variation at 1 st and 2 nd codon positions, whereas 3 rd positions increasingly accumulate multiple substitutions (i.e., homoplasy) in all genes. With cyt b, you get all of the noise and none of the signal! -with other mt genes, you get a little signal along with the noise. Why ND2?In terms of amino acid sequence, ND2 is the 3 rd most variable gene after ATPase 8, which is very short (~165-168 bp) and therefore provides relatively little information, and ND6, which is also relatively short (~519-522 bp) and is generally more difficult to amplify and sequence, given its unusual base composition and location near the control region. In contrast, the complete ND2 gene can be amplified in either one or two pieces with primers that have worked well on essentially all birds (L5216-H6313 for the whole gene; L5216-H5766 and L5758-H6313 for two pieces). We routinely amplify the gene in two pieces and run four sequencing reactions (both strands of each PCR product). What are all those Y's and R's in the primer sequences?Many of the primers listed below have several and as many as six or more "degenerate" positions. What this means is that there are actually different versions of the primer that have

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Reddish Egret (Egretta rufescens)

Cited by 13 publications

References 0 publications

A re‐evaluation of management units based on gene flow of a rare waterbird in the Americas

A re‐evaluation of management units based on gene flow of a rare waterbird in the Americas

A spatial model for the beneficial use of dredge spoil deposition: Creation and management of breeding habitat for reddish egrets in Texas

Genetic Diversity and Population Structure of Reddish Egrets Along the Texas Coast

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