Category: Neotropical Biology and Conservation

Man’s best friend could be a jaguar’s next meal: A case study from the Mexican Caribbean

Events of jaguars predating on and attacking dogs are poorly documented throughout the Americas. Researchers from Mexico and Germany report in detail jaguar attacks on 20 dogs at a tourist site in the Mexican Caribbean. In addition, they describe an initiative proposed by locals as well as national and international NGOs to prevent human-jaguar conflicts due to pet predation. The study was published in the open-access journal Neotropical Biology and Conservation.

Mahahual is a small fishing village in the Mexican Caribbean that receives a large number of tourists every year. Over the past 15 years, its population has increased rapidly, and, as a result, people have started to settle in areas away from the main center of the village, sometimes encroaching on jaguar habitats. As most of those people keep guard dogs on their properties, jaguars have taken advantage of this situation by wandering near people’s houses at night, and sometimes those dogs end up as a night-time snack for the big cats.

A jaguar is photographed wandering around houses looking for dogs. Photo by Víctor Rosales

Unlike jaguar attacks on livestock, attacks and predation on other domestic species such as dogs have only been documented anecdotally (through interviews or from remains found in faeces). Such attacks can indeed lead to pet predation conflict, which can ultimately have a negative impact on the jaguar populations. Attachment to pets may lead humans to start killing the big cats, which is of particular concern for an endangered species like the jaguar. Furthermore, it is possible that a wide range of pathogens may be transmitted from dogs to jaguars, further threatening the health of jaguar populations in Mahahual.

A dog injured as a result of a jaguar attack in Mahahual, Quintana Roo, Mexico. Photo by Víctor Rosales

This is why a multidisciplinary team made up of veterinarians, conservationists, locals, NGOs (Aak Mahahual A.C. and International Fund for Animal Welfare (IFAW)) and researchers (El Colegio de la Frontera Sur and Universidad Tecnológica de Calakmul), led by Dr Jonathan Pérez Flores, began investigating the occurrence of jaguar predation and attacks on dogs at the Mexican Caribbean tourist site from almost 10 years ago. Their research was just published in the open-access journal Neotropical Biology and Conservation.

According to their report, the behaviour of Mahahual’s jaguars resembles that of Indian leopards, which have already turned dogs into an important component of their diet, preferring them over livestock. Jaguars and leopards usually attack from a blindside, biting the dogs on the neck or head to avoid counterattacks. Similarly to leopards, jaguars attack at night and kill more dogs during the dry season. This is likely due to the fact that it’s easier for jaguars to hunt dogs than their natural prey: armadillo, lowland paca, brocket deer, white-tailed deer. Furthermore, the latter are less available during the dry season.

One of the night houses built by the people of Mahahual, Aak Mahahual A.C. and International Fund for Animal Welfare (IFAW). Photo by Francisco Rubén Castañeda

In 2017, the people of Mahahual partnered with Aak Mahahual A.C. and IFAW to build protective night houses made of wood and wire mesh meant to keep dogs safe at night. So far, they’ve built 38 such houses to prevent jaguar attacks. Sterilisation and vaccination campaigns have also been intensified since late 2020 to prevent the transmission of diseases between the two species.

Thanks to this study, we now have a better understanding of the adaptability and persistence of jaguars in human-dominated landscapes and the impact of dog predation by jaguars. However, the authors call for more research in the area to help paint the full picture.

Research article:
Carral-García M, Buenrostro I, Weissenberger H, Rosales V, Pérez-Flores J (2021) Dog predation by jaguars in a tourist town on the Mexican Caribbean. Neotropical Biology and Conservation 16(4): 461-474. https://doi.org/10.3897/neotropical.16.e68973

Vibes before it bites: 10 types of defensive behaviour for the False Coral Snake

The False Coral Snake (Oxyrhopus rhombifer) may be capable of recognising various threat levels and demonstrates ten different defensive behaviours, seven of which are registered for the first time for the species. Scientists from the Federal University of Viçosa (Brazil) published their laboratory observation results based on a juvenile specimen in the open-access journal Neotropical Biology and Conservation.

In a recent paper in the open-access journal Neotropical Biology and Conservation, a group of Brazilian scientists from the Federal University of Viçosa (Brazil) published ten different defensive behaviours for the False Coral Snake (Oxyrhopus rhombifer), seven of which are registered for the first time for the species. One of these is reported for the first time for Brazilian snakes.

Evolution shaped anti-predator mechanisms in preys, which can be displayed either with avoidance or defensive behaviours. The current knowledge about such mechanisms are still scarce for many snake species, but it is constantly increasing over the last years. These data are helpful for better understanding of the species ecology, biology and evolution.

The False Coral Snake (O. rhombifer) is a terrestrial snake species with a colouration like the true coral snake . The species has a wide geographic distribution, occurring in Argentina, Paraguay, Uruguay, Bolivia and all Brazilian biomes. Among its previously known anti-predator mechanisms, this species has already shown cloacal discharge, body flattening, struggling, erratic movements and hiding the head.

However, these behaviors were only a small part of what this species is capable of doing to defend itself! In November 2017, a juvenile male  captured in the Atlantic Forest of southeastern Brazil was observed under laboratory settings, where the scientists would simulate a predation attempt with an increasing threat level.

We released the snake on to the laboratory bench and let it notice our presence. The animal remained motionless at first, then performed a pronounced dorsoventral flattening of the anterior part of the body, raised its tail, adopted an S-shaped posture, raised the first third of the body and performed brief body vibrations. Then we approached the snake, which remained with the same posture and body vibrations. When we touched the animal (not handling), it remained with the S-shaped posture, keeping the first third of the body elevated and the dorsoventral flattening (however, less accentuated) and started to display erratic movements, false strikes and locomotor escape. When handled, the snake only struggled,

shares the lead scientist Mr. Clodoaldo Lopes de Assis.

Amongst ten recorded behaviour types only three were among those already registered for this species. Since defensive responses in snakes decrease as body size increases, juveniles exhibit a broader set of defensive behaviour than adults. Because of that, some types of behaviour described in this study might be explained either by physical constraints or stage of development of the individual.

Some types of behaviour resemble the ones of true coral snakes of the genus Micrurus, a group of extremely venomous snakes. Thus, this similarity may be linked with the mimicry hypothesis between these two groups, where harmless false coral snakes take advantage of their similar appearance to the true coral snakes to defend themselves.

Another type of anti-predation mechanism shown — body vibrations — is yet an unknown behaviour for Brazilian snakes and has been recorded for the first time. This type of behaviour is difficult to interpret, but could represent a defensive signal against non-visually orientated predators.

Finally, defensive strategies of the specimen differed according to the threat level imposed: starting from discouraging behaviour up to false bites, erratic movements and locomotor escape.


Some defensive types of behaviour displayed by the juvenile Oxyrhopus rhombifer
Credit: Mr. Clodoaldo Lopes de Assis
License: CC-BY 4.0

O. rhombifer may be capable of recognising different threat levels imposed by predators and adjusting its defensive behaviour accordingly,

highlights Mr. Clodoaldo Lopes de Assis.

Through such simple laboratory observations we can get a sense of how Brazilian snakes are yet poorly known regarding their natural history, where even common species like the false coral snake O. rhombifer can surprise us!

Mr. Clodoaldo Lopes de Assis adds in conclusion.

***

Original source:
Lopes de Assis C, José Magalhães Guedes J, Miriam Gomes de Jesus L, Neves Feio R (2020) New defensive behaviour of the false coral snake Oxyrhopus rhombifer Duméril, Bibron & Duméril, 1854 (Serpentes, Dipsadidae) in south-eastern Brazil. Neotropical Biology and Conservation 15(1): 71-76. https://doi.org/10.3897/neotropical.15.e48564

Pensoft welcomes Neotropical Biology & Conservation to its open-access journal portfolio

Eleven studies in the first issue demonstrate the modernized look & feel of the Brazil-born journal, as provided by the scholarly publishing platform ARPHA

Launched by the Brazilian university Unisinos (Universidade do Vale do Rio dos Sinos) in 2006, the open-access, peer-reviewed Neotropical Biology & Conservation moves to the journal family of scholarly publisher and technology provider Pensoft.

Neotropical Biology & Conservation welcomes research and review articles, short communications and commentaries on the biology and behaviour of organisms from the tropical ecoregions of the Americas and the entire South America. Special emphasis is given to papers that demonstrate the application of conservation principles for natural resource management and policy. Manuscripts can be published in Portuguese, as well as English, where an English-language abstract is mandatory.

The journal is published three times a year, with the first 2019 issue already available on the new website. New research papers, part of the second issue, will be out next Monday (15th July).

New website for Neotropical Biology & Conservation

Beyond Neotropical Biology & Conservation‘s new glossy and user-friendly appearance, the Pensoft-developed scholarly platform ARPHA provides its signature fast-track, end-to-end publishing system to the benefit of its users: authors, reviewers and editors alike. Thereby, each submitted manuscript is carried through the review, editing, publication, dissemination and archiving stages without leaving ARPHA’s collaboration-centred online environment. The articles are available in PDF and machine-readable XML formats, so that they are easy to discover, access, cite and reuse.

Editor-in-Chief of Neotropical Biology & Conservation Dr Ana Maria Leal-Zanchet, says:

“It’s an honour for the Editorial board of Neotropical Biology & Conservation that the journal becomes a member of the Pensoft/ARPHA team. This journal was born as Acta Biologica Leopoldensia, which was published by Unisinos between 1979 and 2005. Since 2006 Neotropical Biology & Conservation continued the tradition of this former journal, publishing articles from all around Brazil, and even enhancing its coverage to other parts of the Neotropics. In recent years, the scientific community that uses our journal as a venue to disseminate their research results has been continuously increasing. We maintain our commitment to disseminate scientific findings through open access and to continue pursuing a sustainable international growth. I am sure that the user-friendly ARPHA’s publishing system and the great support of the Pensoft team will please authors, reviewers and the Editorial board of the journal, enhancing the efficiency, quality and swiftness of publishing, as well as the international visibility of Neotropical Biology & Conservation.”

ARPHA’s and Pensoft’s founder and CEO Prof Lyubomir Penev says:

“I’m delighted to welcome Neotropical Biology & Conservation to the Pensoft/ARPHA family, where the journal not only feels at home amongst predominantly biodiversity-themed titles, but also comes to complement another two Brazil-born journals: Check List, which publishes biogeographical data, especially for the use of biodiversity conservation, and Zoologia: mostly focusing on systematics, evolution and taxonomy in the field of Zoology. With this kind of background and the constantly expanding high-tech functions of ARPHA, I’m certain that we are fully equipped to build on the image and success of Neotropical Biology & Conservation.”

What’s on in the first issue?

Amongst the 11 articles in the first issue of Neotropical Biology & Conservation, there is the study by Dr Lucas Porto (Federal University of Rio Grande do Sul) and Dr Ana Maria Rui (Universidade Federal de Pelotas), which observes Crab-eating and Pampas foxes in southern Brazil for a year to compare the diets and habitat uses of the two sympatric species. Curiously, the canids demonstrated a high overlap of their diets at all times, with the exception of autumn.

Another paper, authored by a research team from the Federal Institute of Education, Science and Technology of Goiano and the Federal University of Goiás, describes the frequency, occurrence status and activity period of the most common medium- and large-sized mammals living in the world’s most biodiverse savanna: Brazil’s Cerrado. Namely, subjects of the study were the Giant anteater, Nine-banded armadillo, South American tapir, Crab-eating fox and Lowland paca, where the largest species were found to have the greatest variation in time period of activity.

A collaborative work at the Federal University of Pernambuco, University of Brasília and the Rural Federal University of Pernambuco, reports important observations of the unexpectedly diverse bat fauna in an urban environment located in the Atlantic Forest, northeastern Brazil. Between May 2006 and April 2007, the researchers captured 950 bats identified to 16 species and five families.

The first 2019 issue of Neotropical Biology and Conservation.

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