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Dendropsophus branneri

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Dendropsophus branneri
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Anura
Family: Hylidae
Genus: Dendropsophus
Species:
D. branneri
Binomial name
Dendropsophus branneri
(Cochran, 1948)
Synonyms

Hyla scrobiculata B. Lutz, 1973

Dendropsophus branneri is a small hylid tree frog endemic to the Atlantic Forest region of Brazil.[2] It feeds mainly on arthropods[3] and is preyed upon by various invertebrates (e.g., giant aquatic bugs, spiders) and vertebrates (e.g., snakes, birds)[4]. Although currently classified by the IUCN Redlist as "least concern",[5] D. branneri suffers rapid habitat loss due to residential development, agriculture, logging, and clearing for pastureland.[2][6] Male D. branneri are noted for their fighting call, which differs significantly in frequency, duration, and pulses per call compared to their mate advertisement call.[7] Males are also noted for their willingness to escalate physical altercations against other males, which includes kicking, pushing, and wrestling their opponent into non-dominant positions.[7]

Description

Adult

​​D. branneri females are about 21.5mm and males are about 18mm in snout-vent length (SVL). Their snout is short and rounded from above. Both sexes have vomerine teeth located in two small patches between the choanae. The skin of the throat and chest is smooth and females and slightly plicated in males due to their larger vocal sac. The skin of the belly is coarsely granular. Their dorsal color ranges from pinkish vinaceous to fawn color. They have a light-brown cross bar between their eyes and a black mark on their back that extends to the sacral region.[8]

Both sexes exhibit a silvery white spot under each eye, which differentiates D. branneri from a host of closely related and morphologically similar Dendrosophopus species.[9] However, an infrequent polymorphism exists in which D. branneri individuals exhibit either no spots or a spot under only one eye.[10]

Tadpole

Tadpole bodies are violin-shaped (elongated in top-down dorsal view, depressed in lateral view). Their body height is ~50% of the body length, and body length is ~25% of the total length (including tail). Nostrils are small elliptical structures located near the oral disc and are visible from both a lateral and dorsal view. Eyes are laterally oriented at a distance of ~55% of the body width. The eye diameter is ~25% of the body width.[11]

Habitat and distribution

Dendropsophus branneri is endemic to Brazil. It is found adjacent to mountainous regions in the Brazilian Atlantic Forest between Maranhão and Rio de Janeiro, including the Rio Paraíba valley and High Muriaé River regions.[2][9] They are habitat generalists relatively widely distributed across the Atlantic Forest in ecosystems such as savanna, shrubland, and grassland, but prefer Restinga forest and high-altitude swamp habitats.[5][12] D. branneri are found in large numbers in vegetation surrounding temporary and permanent freshwater ponds.[3]

Conservation

Habitat loss

The Atlantic Forest region is known for its richness in biodiversity, with over 400 species known and additional species being continually documented.[13] A 2013 study estimated that anurans represent 6.5% of approximately 459 species in the Atlantic Forest biome.[14] The Atlantic Forest is at only 7% of its original size due to habitat destruction[15] from residential development, agriculture, logging, and clearing of pasture lands.[6] D. branneri inhabit areas under "high anthropogenic impact", for example urban areas nearby gardens and residential neighborhoods.[2] With such extreme habitat loss, D. branneri have begun to inhabit human-altered regions. Field surveys surprisingly found high density many frog species in the High Muriaé region, despite its comparatively high degradation by humans.[2]

In the mid 1800’s, Atlantic Forest regions inhabited by D. branneri underwent cacao cultivation by the "cabruca" agricultural strategy, in which trees are planted within thinned-out native forest or introduced trees such as jackfruit, yellow mombin, and mountain immortelle. Cabruca-cultivated regions now stretch through regions 70% the size of Atlantic Forest remnants in southern Bahia, Brazil. Appraisals of these cultivated areas suggest that these regions are still inhabitable for frogs and other local fauna, but is not as strong a habitat as unaltered forest.[16]

Phylogeny and relatives

Genus Dendropsophus contains over 100 species of small frogs that inhabit Central and South America.[7] D. branneri was previously classified under genus Hyla, but has been re-classified to genus Dendropsophus.[8] D. branneri is morphologically similar to close relatives D. minusculus and D. oliveira but can be distinguished by unique white blotches underneath their eyes and distinctive advertisement calls.[10]

Diet

D. branneri utilize a "sit and wait" strategy in which they wait for food to enter proximity by chance, rather than actively foraging.[3] A study of D. branneri living on coca plantations in southern Bahia, Brazil suggests a diet consisting largely of arthropods. Analysis of stomach contents revealed three main prey orders: Diptera (14.96%), Araneae (11.02%), and Larval lepidoptera (11.02%). Others present include: blattaria, hemiptera, acari, hymenoptera, orthoptera. An average of 1.5 items were found per frog stomach. There was no significant correlation between frog body mass or snout-vent length and ingested volume of prey.[3]

Stomach content analysis of closely related species D. minutus sampled in Serra Norte, Carajás, Brazil presented a slightly different prey composition, in which order Araneae was the dominant prey-type.[17] Larger frog species P. rohdei and P. burmeisteri tend to prey on larger invertebrates compared to D. branneri, likely related to a larger mouth size.[18]

Stomach content analysis of D. branneri exhibited significant plant content (13.39% of total volume). It is unclear whether this ingestion is intentional or an accidental consequence of arthropod hunting. D. branneri are the first species in which stomach flushing was used as a mechanism for studying the diet of frogs smaller than 14.4mm snout vent length (SVL).[3]

Mating

Breeding season

The D. branneri breeding season lasts from May to September,[9] with the highest reproductive activity concentrated during the rainy season.[7] During the breeding season, D. branneri aggregate and lay eggs on the water surface.[9] D. branneri are known to have a uniquely long breeding season compared to other frogs.[3] Unlike most frog species that can only utilize temporary ponds for breeding, D. branneri is able to breed in both temporary and permanent pools.[9] This allows D. branneri to inhabit a comparatively wide variety of habitats including savanna, shrubland, lowland grassland, freshwater marshes, and human-impacted areas such as pastureland.[5]

Male/male interactions

D. branneri males are more willing to escalate aggressive behavior compared to other frog species, who prefer avoiding escalation and associated injury risk. Preliminary confrontational behaviors include chasing and aggression calls. Escalated behaviors include kicking, pushing, and other physical attacks using their anterior limbs that force the opponent into a non-dominant position. Analysis of vocalizations has demonstrated distinct differences between fighting calls and advertisement calls. Compared to advertisement calls, fighting calls exhibit lower dominant frequency (4866.50 vs. 6350 Hz), longer duration (0.2492 vs. 0.03 seconds), and higher number of pulses per call (62.3 vs. 4).[7]

Enemies

Predators

Because D. branneri inhabit and breed at the fringes of ponds, they are highly accessible to both aquatic and terrestrial predators. D. branneri are particularly vulnerable to predation during metamorphic stages as they are transitioning from water to land.[19]

Dendropsophus species are generally smaller or similar in size to their predators. Vertebrate predators include snakes, birds, and other frogs. Invertebrate predators include giant aquatic bugs and spiders.[4] Most documented instances of spider predation of Dendropsophus frogs are in the southern Atlantic Forest. Spiders can serve as either predators or prey to D. branneri, depending on the frog’s size.[20] Most arachnid predators of Dendropsophus species belong to the family Ctenidae, but also include: Araneidae, Lycosidae, Nephilidae, Pisauridae, and Trechaleida.[20] A field predation event of a theraphosid spider (84.12mm) on a juvenile of D. branneri’s close relative Dendropsophus marinus (90.52mm) exhibited bite hemorrhages in the prey’s gular region. Two hours after the ambush, the prey was still alive but paralyzed in one eye and hind limb.[4] Small frogs are likely a vital component of Ctenidae diets during the rainy season, when there are many temporary ponds accessible to spiders.[20]

Parasites

Anurans play a central role in the parasitic worm (helminth) life cycle because they both consume and are preyed upon by a large variety of animals, which allows for widespread transmission of helminth across host species. A 2017 study investigated the presence of helminth in various tree frog species in the Brazilian Atlantic Forest and found five different genera of helminth in a sample of 33 D. branneri specimens. Encysted larvae of parasitic roundworm genuses Brevimulticaecum and Porrocaecum were observed in D. branneri gastrointestinal tissues.[21]

Vocalizations

Amphibian vocalization characteristics are defined by both frog physiology (e.g., mass, SVL) and environmental factors (e.g., humidity, temperature).[22] Multiple studies offer slightly differing values for D. branneri basic vocalization metrics. An older study by Nunes et al. documents average values of: 4 pulses per call, 0.03 second call duration, 6.35 kHz dominant call frequency, and 0.37 second interval between calls.[23] A more recent study by De Oliveira-Santos et al. documents average values of: 11 pulses per call, 0.73 second call duration, 6.7 kHz dominant call frequency, and 93 calls per minute.[12]

Analysis of call characteristics as a function of body metrics surprisingly demonstrated no relationship between SVL and dominant frequency. Large body mass was associated with decreased number of pulses per note and body mass, large SVL was associated with increased interval duration between calls.[12]

There is generally greater variation in advertisement across males than within a single male. The metric of call repetition rate has particularly high variation between D. branneri males and could potentially play a role in individual recognition.[12]

References

  1. ^ Gonçalves da Cruz, Carlos Alberto; Potsch de Carvalho-e-Silva,, Sergio; Andrade, Gilda (2004). "Dendropsophus branneri". IUCN Red List of Threatened Species. 2004: e.T55420A11306454. doi:10.2305/IUCN.UK.2004.RLTS.T55420A11306454.en. Retrieved 15 November 2021.{{cite journal}}: CS1 maint: extra punctuation (link)
  2. ^ a b c d e Santa, Diego José (January 13, 2010). "Anurans in the region of the High Muriaé River, state of Minas Gerais, Brazil". Herpetology notes. 3 (1): 1–10 – via Research Gate.
  3. ^ a b c d e f Castro, Indira Maria (May 30, 2016). "Diet of Dendropsophus branneri (Cochran, 1948) (Anura: Hylidae) from a cocoa plantation in southern Bahia, Brazil". North-Western Journal of Zoology. 12 (1): 159–165 – via Research Gate.
  4. ^ a b c Menin, Marcelo; Rodrigues, Domingos De Jesus; Azevedo, Clarissa Salette de (2005-06-01). "Predation on amphibians by spiders (Arachnida, Araneae) in the Neotropical region". Phyllomedusa: Journal of Herpetology. 4 (1): 39. doi:10.11606/issn.2316-9079.v4i1p39-47. ISSN 2316-9079.
  5. ^ a b c IUCN (2004-04-30). "Dendropsophus branneri: Carlos Alberto Gonçalves da Cruz, Sergio Potsch de Carvalho-e-Silva, Gilda Andrade: The IUCN Red List of Threatened Species 2004: e.T55420A11306454". Red Lst. doi:10.2305/iucn.uk.2004.rlts.t55420a11306454.en.
  6. ^ a b Martini, Adriana Maria Zanforlin; Fiaschi, Pedro; Amorim, André M.; Paixão, José Lima da (May 31, 2007). "A hot-point within a hot-spot: a high diversity site in Brazil's Atlantic Forest". Biodiversity and Conservation. 16 (11): 3111–3128. doi:10.1007/s10531-007-9166-6. ISSN 0960-3115.
  7. ^ a b c d e Aguiar, Pedro Lopes; Souza, Raphael Felipe; De Oliveira, Eduardo Borges; Nali, Renato Christensen (2022-03-07). "Male aggressiveness in the tree frog Dendropsophus branneri (Anura, Hylidae): Physical combat, fighting call, and escalated behavior". Caldasia. 44 (1): 203–207. doi:10.15446/caldasia.v44n1.88112. ISSN 2357-3759.
  8. ^ a b Cochran, Doris (September 15, 1948). "A new species of tree frog from Pernambuco, Brazil". Journal of the Washington Academy of Sciences. 38 (9): 316–317 – via Biodiversity Heritage Library.
  9. ^ a b c d e Baracho, E.B. (January 25, 2014). "Dendropsophus branneri (Cochran, 1948) (Anura: Hylidae) as prey to invertebrates in northeastern Brazil". herpetology Notes. 7 (1) – via Research Gate.
  10. ^ a b Zina, J; Silva, Gr; Loebmann, D; Orrico, Vgd (August 1, 2014). "The recognition of Dendropsophus minusculus () (Hylidae, Dendropsophini) as a highly polymorphic, multi-domain distributed species". Brazilian Journal of Biology. 74 (3 suppl 1): S146–S153. doi:10.1590/1519-6984.22912. ISSN 1519-6984.
  11. ^ De Abreu, Rafael Oliveira; Juncá, Flora Acuña; Souza, Isana Carla Amorim; Napoli, Marcelo Felgueiras (2015-04-09). "The tadpole of Dendropsophus branneri (Cochran, 1948) (Amphibia, Anura, Hylidae)". Zootaxa. 3946 (2): 296. doi:10.11646/zootaxa.3946.2.11. ISSN 1175-5334.
  12. ^ a b c d De Oliveira-Santos, José Ricardo; De Araújo, Alan Pedro; De Moraes, Maísa Maria; De Santana, Adsson Rodrigues; Rocha, Eric Bernardino Gadelha; Dias, Emerson Gonçalves; Leandro-Silva, Victor; Da Silva Oliveira, Alan Jefferson; De Moura, Geraldo Jorge Barbosa; Gambale, Priscila Guedes (2020-10-09). "Intra- and interindividual variation in the advertisement call of Dendropsophus banner (Cochran, 1948) (Anura: Hylidae)". Zootaxa. 4860 (1): 146–150. doi:10.11646/zootaxa.4860.1.9. ISSN 1175-5334.
  13. ^ Barreto Nascimento, Luciana (1994). Herpetologia no Brasil. Aline T. Bernardes, Giselle Agostini Cotta, Pontifícia Universidade Católica de Minas Gerais, Fundação Biodiversitas, Fundação Ezequiel Dias. Belo Horizonte: PUC-MG. ISBN 85-85401-06-0. OCLC 33362323.
  14. ^ Haddad, Célio F. B. (2013). Guia dos anfíbios da Mata Atlântica : diversidade e biologia = Guide to the amphibians of the Atlantic Forest : diversity and biology. São Paulo. ISBN 978-85-65622-03-5. OCLC 1103538070.{{cite book}}: CS1 maint: location missing publisher (link)
  15. ^ Drummond, Jose (March 29, 2017). "Book Review: Cláudia Maria Roche Costa et al., eds., Biodiversidade em Minas Gerais—Um Atlas para a sua Conservação (Biodiversity in Minas Gerais—An Atlas for Its Conservation". Environmental Practice. 2 (4): 324–326. doi:10.1017/S1466046600001897. ISSN 1466-0466.
  16. ^ Faria, Deborah; Paciencia, Mateus Luís Barradas; Dixo, Marianna; Laps, Rudi Ricardo; Baumgarten, Julio (June 6, 2007). "Ferns, frogs, lizards, birds and bats in forest fragments and shade cacao plantations in two contrasting landscapes in the Atlantic forest, Brazil". Biodiversity and Conservation. 16 (8): 2335–2357. doi:10.1007/s10531-007-9189-z. ISSN 0960-3115.
  17. ^ Jiménez, Randall; Bolaños, Federico (2012-10-18). "Uso de recursos alimentares e espaciais por dois anuros do gênero Dendropsophus (Anura: Hylidae) de La Selva, Costa Rica". Phyllomedusa: Journal of Herpetology. 11 (1): 51. doi:10.11606/issn.2316-9079.v11i1p51-62. ISSN 2316-9079.
  18. ^ Lima, Jonatha Edson de Paula (June 1, 2010). "Diet of two sympatric Phyllomedusa (Anura: Hylidae) species from a cacao plantation in southern Bahia, Brazil". North-Western Journal of Zoology. 6 (1): 13–24 – via Research Gate.
  19. ^ Toledo, Luis Felipe (December 1, 2005). "Predation of juvenile and adult anurans by invertebrates: Current knowledge and perspectives". Herpetological Review. 36 (4): 395–400 – via Research Gate.
  20. ^ a b c de Araujo Lira, André Felipe (May 26, 2020). "Predation of Dendropsophus branneri (Cochran, 1948) (Anura: Hylidae) by wandering spiders (Araneae: Ctenidae) in an Atlantic Forest remnant". Herpetology Notes. 13: 421–424 – via Biotaxa.
  21. ^ Martins-Sobrinho, Paulo Mateus; Silva, Winny Gomes de Oliveira; Santos, Elizandra Gomes dos; Moura, Geraldo Jorge Barbosa de; Oliveira, Jaqueline Bianque de (2017-07-26). "Helminths of some tree frogs of the families Hylidae and Phyllomedusidae in an Atlantic rainforest fragment, Brazil". Journal of Natural History. 51 (27–28): 1639–1648. doi:10.1080/00222933.2017.1337945. ISSN 0022-2933.
  22. ^ Sun, Jennifer W.C.; Narins, Peter M. (February 1, 2005). "Anthropogenic sounds differentially affect amphibian call rate". Biological Conservation. 121 (3): 419–427. doi:10.1016/j.biocon.2004.05.017.
  23. ^ Nunes, Ivan; Santiago, Roseane Sampaio; Juncá, Flora Acuña (August 1, 2007). "ADVERTISEMENT CALLS OF FOUR HYLID FROGS FROM THE STATE OF BAHIA, NORTHEASTERN BRAZIL (AMPHIBIA, ANURA, HYLIDAE)". South American Journal of Herpetology. 2 (2): 89–96. doi:10.2994/1808-9798(2007)2[89:ACOFHF]2.0.CO;2. ISSN 1808-9798.


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