Ornitologia Neotropical最新文献

SEEDEATERS AND SEEDS AT A TECOMA SAVANNA IN THE SOUTHERN PANTANAL, BRAZIL 巴西潘塔纳尔南部的tecoma稀树大草原上的食籽动物和种子

4区生物学

Ornitologia Neotropical Pub Date : 2023-11-13 DOI: 10.58843/ornneo.v34i2.1003

Iêda Maria Novaes Ilha, José Ragusa-Netto

{"title":"SEEDEATERS AND SEEDS AT A TECOMA SAVANNA IN THE SOUTHERN PANTANAL, BRAZIL","authors":"Iêda Maria Novaes Ilha, José Ragusa-Netto","doi":"10.58843/ornneo.v34i2.1003","DOIUrl":"https://doi.org/10.58843/ornneo.v34i2.1003","url":null,"abstract":"Seedeaters (Sporophila spp.) comprise a rich Neotropical bird group of seed consumers common in open habitats. In this study, we documented the feeding habits of seedeaters and seed production at a Tecoma savanna (dominated by Tabebuia aurea) in southern Pantanal, Brazil. We also analyzed the relationship between seed offer (abundance, richness, and diversity) and the number of seedeaters foraging across seasons. Six species (Sporophila angolensis, S. caerulescens, S. collaris S. hypoxantha, S.leucoptera, and S. lineola) occurred in the savanna, mainly in the height of the wet season, when seed production increased abruptly, attracting seedeaters. Seedeaters used 14 of 16 grass species that produced seeds. Indeed, the number of foraging seedeaters paralleled the abundance and diversity of seeds, and the number of species consumed. During much of the dry season, when seeds were not produced, the few remaining seedeaters mostly consumed arthropods and flowers. The diet of seedeaters ranged from mostly seeds (S. angolensis) to a moderate proportion of flowers and arthropods (S. leucoptera). The offer of a rich set of seeds attractive to seedeaters indicates that the Tecoma savanna is a seasonally important habitat for these birds. Of concern, large areas of native grasses in the Pantanal have recently been transformed into exotic pastures, and extensive fires have become common. Thus, conservation of this singular area is important for seedeaters, which move over wide areas searching for an abundant and diverse seed supply.","PeriodicalId":54663,"journal":{"name":"Ornitologia Neotropical","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136348263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AN OBSERVATION OF REVERSE MOUNTING BY THE SPOT-WINGED PIGEON PATAGIOENAS MACULOSA 斑翅鸽反向爬升的观察

4区生物学

Ornitologia Neotropical Pub Date : 2023-11-13 DOI: 10.58843/ornneo.v34i2.1205

Carlos Bosque

引用次数: 0

MORPHOMETRIC TRAITS AND THEIR ASSOCIATION WITH SEX IN THE KEEL-BILLED TOUCAN RAMPHASTOS SULFURATUS 龙嘴巨嘴鸟的形态特征及其与性别的关系

4区生物学

Ornitologia Neotropical Pub Date : 2023-11-13 DOI: 10.58843/ornneo.v34i2.1233

Danielle Erin Leeman Suástegui, Ubaldo Márquez-Luna, Carlos Vásquez, Blanca Valladares Riverol, Josué Garduño Ruiz, Annuar Majluf Trejo

{"title":"MORPHOMETRIC TRAITS AND THEIR ASSOCIATION WITH SEX IN THE KEEL-BILLED TOUCAN RAMPHASTOS SULFURATUS","authors":"Danielle Erin Leeman Suástegui, Ubaldo Márquez-Luna, Carlos Vásquez, Blanca Valladares Riverol, Josué Garduño Ruiz, Annuar Majluf Trejo","doi":"10.58843/ornneo.v34i2.1233","DOIUrl":"https://doi.org/10.58843/ornneo.v34i2.1233","url":null,"abstract":"Sexing monomorphic birds is essential for reproduction in conservation programs. In ramphastids (toucans) species, males have longer beaks than females, making beak morphometry potentially useful for sexing. In this study, we measured the following traits: curved beak length, total culmen length, straight beak length, curved and straight length of the ventral line of the gnathotheca, beak width, lateral area of the rhinotheca, and cloacal opening in 44 Keel-billed Toucans, as well as previously reported morphometric data from 17 additional individuals. Measurements were obtained using two methods (manual and image processing software), and the reliability between the two methods was assessed using the intraclass correlation coefficient (ICC). Individuals of unknown sex were sexed via PCR tests. The ICC showed poor reliability between the two measurement methods, so we only used manual measurements for comparisons between the sexes. We used GLMMs to determine whether the morphometric traits we measured could be used to determine sex in keel-billed toucans. In addition, we evaluated GLMMs to determine which morphometric trait was the strongest predictor of sex in this species. Beak length was longer in adult males than in females. The GLMMs indicated that beak traits associated with sex in this species are beak curved length, beak straight length, straight length of the ventral line of the gnathotheca, and total culmen length. The straight length of the ventral line of the gnathotheca was the strongest predictor of sex in the Keel-billed Toucan. Unlike previous research, the development of GLMMs allows us to determine the probability of a toucan’s sex based on continuous variables, facilitating sexing and allowing us to evaluate the reliability of the estimation of the sexing of each toucan. This method is an alternative for situations where other sexing methodologies cannot be performed.","PeriodicalId":54663,"journal":{"name":"Ornitologia Neotropical","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136348007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A NEST OF CLUB-WINGED MANAKIN MACHAEROPTERUS DELICIOSUS IN NORTHWEST ECUADOR 厄瓜多尔西北部的美味长翅侏儒龙的巢

4区生物学

Ornitologia Neotropical Pub Date : 2023-10-06 DOI: 10.58843/ornneo.v34i2.1181

Juan F Freile, Heike Brieschke

引用次数: 0

Index & Reviewers Volume 27 索引与审稿人第27卷

IF 0.1 4区生物学

Ornitologia Neotropical Pub Date : 2016-01-01 DOI: 10.3138/tjt.27.2.313

A. Weller

引用次数: 0