Mangrove conservation: a global perspective

Sandilyan, S.; Kathiresan, K.

doi:10.1007/s10531-012-0388-x

Cited by 204 publications

(119 citation statements)

References 47 publications

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“…Mangroves are ecologically and economically important ecosystems that are under threat of destruction around the world (Polidoro et al 2010, Sandilyan andKathiresan 2012). Accordingly, their effective management relies on the identification of the underlying processes influencing the distribution and abundance of ecosystem engineers and keystone organisms (Tanner and Hughes 1994, Bond 2001, Ernest and Brown 2001, Manning et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal distribution and abundance of mangrove ecosystem engineers: burrowing crabs around canopy gaps

Nobbs

Blamires

2015

Ecosphere

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Citation: Nobbs, M., and S. J. Blamires. 2015. Spatiotemporal distribution and abundance of mangrove ecosystem engineers: burrowing crabs around canopy gaps. Ecosphere 6(5):84. http://dx.doi.org/10.1890/ES14-00498.1 Abstract. The burrowing and feeding activities of fiddler and sesarmid crabs have considerable impacts on ecosystem functioning, accordingly they are considered ecosystem engineers. Identifying the factors influencing spatial and temporal variability in crab distribution and abundance would allow us to make predictions of their engineering impacts over a variety of habitats, which is essential for understanding the functionality of mangrove ecosystems. Here we determined the spatial and temporal distributions and abundances of fiddler crabs and sesarmids around canopy gaps in the mangroves of Darwin Harbour, Australia. We sampled three microhabitats at each canopy gap (site): gap center, gap edge and forest edge. We counted crabs and measured selected environmental variables at thirty sites stratified by height within two creek systems during a single season and at six sites within one creek system over two years. Fiddler crabs were generally more abundant in gap centers with Uca flammula preferring lower sites than Uca elegans or Uca signata, while sesarmids favored low to mid-height vegetated sites. Canonical Correspondence analyses showed spatial abundances to be partitioned and the main driving factors were canopy density and site height, as well as substrate features (sediment mounds, soil moisture, soil penetrability, soil surface temperature). Temporal abundances were either highly variable (U. signata) or showed significant seasonal variation only at exposed (U. flammula) or higher (U. elegans) sites. The main factors driving temporal partitioning were humidity, wind speed, sunshine, and soil and air temperatures. Our results indicate that the distribution and abundance of crabs in mangroves varies over time and space, and with sampling scale. Substrate and environmental variables had been largely overlooked by previous studies describing the distribution and abundance of mangrove crabs. We, accordingly, suggest that studies designed to understand mangrove functionality include fine-grained spatial and temporal assessments of ecosystem engineers.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal distribution and abundance of mangrove ecosystem engineers: burrowing crabs around canopy gaps

Nobbs

Blamires

2015

Ecosphere

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“…Approximately 65 mangrove species have been reported around the world (Kathiresan and Bingham 2001).These are mainly divided into three major categories À true mangroves, mangroves, and mangrove associates (Wan Juliana et al 2010). Mangrove forests are distributed in almost 123 countries, covering an area of 15.2 million ha, with 37% in Asia, 27.2% in North and South America, 21% in Africa, and 12.4% in Australia, New Zealand, South Pacific Islands, and Papua New Guinea (FAO 2007;Sandilyan and Kathiresan 2012).…”

Section: Introductionmentioning

confidence: 99%

Composition and diversity of plants in Sibuti mangrove forest, Sarawak, Malaysia

Shah

Kamal

Rosli

et al. 2015

Forest Science and Technology

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Sarawak is endowed with numerous pristine and estuarine mangroves. However, information pertaining to the species composition and diversity of pristine mangroves of Sarawak is scanty. Hence, this study was carried out to assess the plant composition and diversity of Sibuti mangrove forest, Miri, Sarawak to investigate the current status and diversity of vegetation. Nine mangrove plant species were recorded employing the line transect (100À240 m) survey method. Major mangrove species were Rhizophora apiculata, Xylocarpus granatum, and Nypa fruticans. The stand density was recorded as 1938.46 § 482.24 trees ha ¡1 , 1722.22 § 254.58 saplings ha ¡1 , and 6222.22 § 384.90 seedlings ha ¡1 . The mean diameter, height, and basal area for the whole forest stand were 20.83 § 13.79 cm, 13.53 § 5.55 m, and 201.83 § 12.68 m 2 ha ¡1 , respectively. The mean diameter of the dominant species R. apiculata was 24.10 § 13.90 cm, height 15.18 § 5.09 m, and basal area 176.13 § 12.73 m 2 ha ¡1 . The importance value index (IVI) of R. apiculata was 202.24 followed by 63.85 for X. granatum. Shannon diversity indices (H 0 ), Margalef richness (D), and Peilou evenness (J 0 ) of the forest stand were 1.18, 1.41, and 0.54, respectively. Similarity of species composition showed two major clusters for the whole forest stand. The findings of this study suggest that Sibuti mangrove forest stand is undisturbed and healthy. This forest could be managed and conserved for multi-sectoral uses such as ecotourism, biodiversity, research, and education rather than solely as a wildlife sanctuary.

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“…The cause of this decline is likely varied (Petit 1999), but it is potentially at least partially related to the current state of the remaining bottomland forests: younger (and structurally less complex) stands with less decaying wood, altered hydrology, and greater fragmentation of surrounding habitat. In the last few decades, mangrove forests on the species' wintering grounds have also experienced severe degradation and destruction (Sandilyan and Kathiresan 2012), which may contribute to the Prothonotary Warbler population decline, encouraging mangrove conservation efforts (Petit 1999). Because of continued population declines and a relatively low population size (estimated at 1.6 million; PIFSC 2013), the Prothonotary Warbler is considered a Bird of Conservation Concern in the United States (USFWS 2008), is an Audubon Yellow WatchList species (Butcher et al 2007), and is Endangered in Canada (COSEWIC 2012).…”

Section: Introductionmentioning

confidence: 99%

Prothonotary Warbler demography and nest site selection in natural and artificial cavities in bottomland forests of Arkansas, USA

Slevin¹,

Matthews²,

Boves³

2018

ACE

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ABSTRACT. Anthropogenic alterations to bottomland forests in the United States that occurred post-European settlement likely negatively affected many avian species. The Prothonotary Warbler (Protonotaria citrea), a secondary cavity nester that breeds predominantly in these forests, has steadily declined over the past 60 years, and our ability to mitigate this trend is partially limited by a lack of basic biological data. Although much research has been devoted to Prothonotary Warblers, most studies have focused on local breeding populations that use nest boxes; we lack information about habitat selection behavior and demographic parameters of individuals that use natural cavities, which includes the vast majority of the global population. We studied warblers nesting both in boxes and natural cavities in central Arkansas, USA. We aimed to evaluate: (1) microhabitat features important for nest site selection, (2) relationships between these features and nest survival, and (3) demographic parameters of individuals breeding in natural cavities versus nest boxes. We hypothesized (1) selected nest site characteristics are associated with nest survival, and (2) natural cavities and nest boxes provide similar nest features related to clutch size and number fledged, but that predation protection differs. We found that warblers preferred nesting in dead trees with cavities that were higher and shallower than available random cavities, and that canopy cover within 5 m of nests was inversely related to nest survival. Demographic parameters did not differ between natural cavities and nest boxes; however, when excluding flooded nests, boxes experienced lower rates of nest depredation. We believe that forest management strategies that increase the number of suitable dead nest trees and restore the natural hydrology of these ecosystems would create and improve habitat for this iconic species. We advocate multiscale experimental canopy cover manipulation to explore the causal mechanism (s) of the relationship we found between canopy cover and nest survival.Démographie et sélection du site de nidification de la Paruline orangée dans des cavités naturelles et artificielles en forêts sur terres basses de l'Arkansas, É.-U.RÉSUMÉ. Les changements d'origine anthropique apportés aux forêts des terres basses aux États-Unis suivant la colonisation européenne ont vraisemblablement affecté négativement de nombreuses espèces d'oiseaux. Les effectifs de la Paruline orangée (Protonotaria citrea), oiseau utilisateur secondaire de cavités qui niche surtout dans ces forêts, ont fortement diminué depuis les 60 dernières années, et notre capacité à freiner cette tendance est en partie limitée par un manque de données biologiques fondamentales. Bien que cette espèce ait fait l'objet de nombreuses recherches, la plupart de celles-ci se sont concentrées sur les populations nicheuses locales utilisant des nichoirs; nous n'avons pas de données sur le comportement de sélection d'habitat ni sur les paramètres démographiques des individus qui utilisent le...

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Mangrove conservation: a global perspective

Cited by 204 publications

References 47 publications

Spatiotemporal distribution and abundance of mangrove ecosystem engineers: burrowing crabs around canopy gaps

Spatiotemporal distribution and abundance of mangrove ecosystem engineers: burrowing crabs around canopy gaps

Composition and diversity of plants in Sibuti mangrove forest, Sarawak, Malaysia

Prothonotary Warbler demography and nest site selection in natural and artificial cavities in bottomland forests of Arkansas, USA

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